Part 2 Flashcards
Membranous Glomerulonephritis / Nephropathy Pathophysiology / Causes
Primary or Secondary
Immune complexes at basement membrane causing thickening and spiking
This causes Protein leak, hypoalb, oedema and hyperlipid (Nephrotic Syndrome)
Primary: Anti PLA2R Antibodies
Secondary: Infection (hep B, Malaria, Syphilis)
MALIGNANCY: Lung and Lymphoma
Autoimmune, SLE / Rheumatoid
Lung Ca that causes paraneoplastic syndromes? Which syndromes?
Small Cell Lung Ca (Central, advanced, smoking)
- ACTH secreting -> Cushings Syndrome (hypokalaemia)
- ADH secreting -> SIADH and hyponatraemia
- Lambert Eaton -> Weakness (Calcium channel)
canagliflozin, dapagliflozin and empagliflozin: What are they and how do they work?
SGLT-2 inhibitors
Inhibit sodium-glucose co-transporter 2 (SGLT-2) in the renal proximal convoluted tubule
reduce glucose reabsorption + increase urinary glucose excretion
Causes normoglycaemic Ketoacidosis
Increased UTIs
Lower limb amputation
Left Varicocele?
Consider RCC
- Compression of Left Testicular Vein
RCC: Flank pain, Haematuria and abdominal mass
Seen in older men
Associated with Von Hippel Lindau (VHL mutation autosomal dominant) CNS and eye Haemangiomas
Stauffer syndrome
Paraneoplastic Hepatic Dysfunction associated with RCC
Thought to be IL 6 Mediated
RCC Paranoeplastic syndrome?
erythropoietin (polycythaemia), parathyroid hormone (hypercalcaemia), renin, ACTH
Stauffer syndrome
DDP4 Inhibitors?
Sitagliptin, Vitagliptin.
Work by increasing GLP 1 levels
GLP causes increased insulin, reduced glucagon.
DDP4 inhibitors therefore cause no weightgain or hypoglycaemia as not effecting insulin directly.
Cause Pancreatitis!
GPL 1 Mimics:
Exenatide or Liraglitide
Cause increase insulin and decrease glucagon
Nausea and Vomiting
Pancreatitis
Cause Weight Loss
Renal Tubular Acidosis Type 1
Due to Reduced H+ Secretion into the urine at the distal convoluted tubule
Leads to a normal anion gap acidosis with hypokalaemia
Associated with hypercalcaemia and kidney stones
HYPOKALAEMIA
Sjrogrens and Rheumatoid Arthritis and Kidney Transpolant are associated with it
Treated with oral sodium bicarbonate
Causes of Normal Anion Gap Acidosis
Addison’s
Bicarbonate Losses (Diarrhoea and RTA)
Chloride Excess (IV Fluids NaCl)
Drugs (acetazolamide)
Causes of Increased Anion Gap Acidosis
Ketoacidosis (Starvation, DKA)
Uraemia
Lactic acidosis (Metformin, sepsis, Trauma)
Toxins (salicylates, Methanol, Ethylene Glycol)
Renal Tubular Acidosis Type 2
Proximal Convoluted Tubule is unable to resorb Bicarbonate leading to increased losses. Is a global problem with PCT leading to reduced resobtion of glucose, phosphate, calcium, protein, potassium etc.
HYPOKALAEMIA
Caused by Drugs and Fanconi Syndrome
Drugs include Acetazolamide, Sulfonamides
Renal Tubular Acidosis Type 4
Distal Convoluted Tubule due to reduced Aldosterone action. (Addison’s)
Associated with Hyperkalaemia but normally normal sodium (lower end)
HYPERKALAEMIA
Because aldosterone triggers sodium resorption in exchange for potassium and hydrogen, there is reduced potassium excretion, causing hyperkalemia and reduced acid excretion.
Caused by Diabetes and hypoaldosteronism (steroid use)
Alports Syndrome?
Hereditory X linked recessive Disorder of Type IV Collagen leading to Ear, Eye and Kidney problems.
A cause of Renal Failure and may require transplant.
Leads to microscopic haematuria, proteinuria, progressive kidney dysfunction, bilateral sensorineural deafness, retinitis pigmentosa, Lenticonus (protrusion of lens into anterior chamber)
Renal biopsy - splitting of lamina densa.- Basket Weave
Anti GBM antibodies - Therefore if renal transplant fails may be described as Good pastures rather than graft rejection
Myasthenia Gravis
Bimodal distrubution 20-30 F, 50-70 M.
Progressive Weakness
Auto anitbodies to Acetyl Choline Post Synaptic Receptors.
Treated with acetylcolinesterase inhibitors like noestigmine.
Can be exacerbated into crisis by Aminoglycosides, Beta Blockers, Lithium, Penacillamine, antibiotics, Gentamicin.
ADEM (Acute Disseminated Encephalomylitis)
Autoimmune demylinating disease of the central nervous system. Following bacterial or viral infection 2days - 2 months. Measeles Mumps, Rubella common causes. Multifocal neurological involvement, starting as headache, nausea vomiting, then motor, sensory, ocular motor and brainstem dysfucntion
MRI- supra and infra tentorial demylination
Steroids and IVIG is the management
ADEM (Acute Disseminated Encephalomylitis)
Autoimmune demylinating disease of the central nervous system. Following bacterial or viral infection 2days - 2 months. Measeles Mumps, Rubella common causes. Multifocal neurological involvement, starting as headache, nausea vomiting, then motor, sensory, ocular motor and brainstem dysfucntion
MRI- supra and infra tentorial demylination
Steroids and IVIG is the management
Typhoid
CAused by Salmonella Typhoid (Para Typhoid - Salmonella Paratyphoid)
Faeco oral route enertic Fever
Features:
RElative Bradycardia
Rose spots (paratyphoid) - rash on trunk
Normally it is Constipation Not Diarrhoea
Complications
Osteomylitis, Meningitis, GI Bleed, Cholecystitis
Treated with Cefotaxime
Actinic Keratosis
Multiple, crusty lesions that are pink/brown in sun exposed areas
Topical Florouracil is treatment and sun avoidance
Imiquimod also shows promise
NSAIDS
Treatment:
5 -FU Topical Florouracil cream
NSAIDs
Imiquimod
Cryotherapy and curtarage
Serum Ascites Albumin Gradient
SAAG
SAAG is calculated from Ascitic fluid. Ascitic fluid albumin is taken away from the serum albumin value. If < 11 this indicates portal hypertension
If > 11 this is another cause for Ascites
Low SAAG < 11 causes of Ascites
Indicates portal hypertension
Cirrhosis Alcoholic hepatitis Cardiac ascites Mixed ascites Massive liver metastases Fulminant hepatic failure Budd-Chiari syndrome Portal vein thrombosis Veno-occlusive disease Myxoedema Fatty liver of pregnancy
High SAAG > 11 Causes of Ascites
Peritoneal carcinomatosis Tuberculous peritonitis Pancreatic ascites Bowel obstruction Biliary ascites Postoperative lymphatic leak Serositis in connective tissue diseases
Facioscapulohumeral Muscular Dystrophy?
Autosomal Dominant Mysculodystrophy leading to symtpoms in arm and face
Onset around 20 years old
Winging of the scapular is very characteristic
Progressive but good prognosis - mild symptoms
Transjugular intrahepatic porto-systemic shunt (TIPPS)
Indications:
- Refractory Ascites
- Variceal bleeds
- hepatic pleural effusions
Is a Bypass of the liver - Portal (hypertensive) blood is stented straight into the hepatic vein (and then IVC) without going through the liver.
This reduces portal hypertension however toxins then no longer are going through the liver
Contraindications:
Severe And Progressive Liver Failure - Child-Pugh Score > 12
Uncontrolled hepatic encephalopathy (exacerbated as toxins now bypassing liver)
Right Sided Heart Failure (this increases venous return therefore exacerbating peripheral oedema)
Uncontrolled sepsis
Unrelieved Biliary Obstruction
Transjugular intrahepatic porto-systemic shunt (TIPPS)
Indications:
- Refractory Ascites
- Variceal bleeds
- hepatic pleural effusions
Is a Bypass of the liver - Portal (hypertensive) blood is stented straight into the hepatic vein (and then IVC) without going through the liver.
This reduces portal hypertension however toxins then no longer are going through the liver
Contraindications:
Severe And Progressive Liver Failure - Child-Pugh Score > 12
Uncontrolled hepatic encephalopathy (exacerbated as toxins now bypassing liver)
Right Sided Heart Failure (this increases venous return therefore exacerbating peripheral oedema)
Uncontrolled sepsis
Unrelieved Biliary Obstruction
Churg Strauss Syndrome?
Eosphinophilic granulomatosis with polyangiitis EGPA
ANCA (pANCA) associated medium vessel vasculitis
- Asthma (first phase)
- Eosphinophilia (lung and blood) (second stage)
- Sinusitis (polyps)
- Mononeuritis multiplex (vasculitic (3rd) Stage)
- pANCA (60%)
Leukotriene Receptor Antagonist may precipitate Disease
Steroids and immunosupression
Granulomatosis with Polyangitis?
Wegener’s Granulomatosis
- Autoimmune necrotising granulomatous vasculitis of the upper and lower airways plus kidneys
- Epistaxis, sinusitis, nasal crusting (upper airway)
- Dyspnoea, haemoptysis (Lower Airway)
- Rapidly Progressive Glomerulonephritis
- Saddles-Shape Nose Deformity
- Vasculitis Rash
cANCA > 90%
Managed with steroids and cyclophosphamide
Plasma Exchange
`
Hypernatraemia
Dehydration
Osmotic Diuresis (Hyperosmolar Non Ketotic Diabetic State)
Diabetes Insipidus
Excess IV saline
Correct with caution - can cause cerebral oedema therefore no greather than 0.5mmol/hour concentration correction
Central pontine Myelinolysis is a neurological disorder caused by rapid correction of HYPOnatraemia
Presents with Paraylsis, dysphagia and dysarthria.
Trigeminal Neuralgia?
Electric Shock like pain on light touch of the face. In the Trigeminal region.
First line treatment is Carbemazepine.
Consider diagnosis if:
- Opthalmic region only
- Optic Neuritis
- Bilateral pain
- History of MS in family
- No response to treatment
Primary Biliary Cholangitis
This is an autoimmune disorder effecting liver in middleaged women. Leads to interlobular inflammation of the bile ducts causing cholestasis and leading to cirrhosis
Associated with Connective Tissue Disease: Sjogren's RA Systemic Sclerosis Thyroid disease
Anti Mitochondrial Antibodies are 98%
Anti Smooth Muscle is 30%
Increased risk of Cirrohsis
Osteomalacia and Osteoperosis (due to decreased Vitamin D activation by the Liver)
HEPATIC ADENOCARCINOMA risk 20 x
Tx: Cholestyramine, Fat Soluble Vitamin Replacement, Ursodeoxycholic acid, Liver Transplant
Methotrexate Myelosuppresion?
Treat with Folinic Acid
Cocaine Toxicity Treatment?
Start With Benzos
Then Verapamil for palpitations or tachycardia
AVOID Beta Blocker
Dermatitis Herpetiformis?
Dermatitis herpetiformis is an autoimmune blistering skin disorder associated with coeliac disease. It is caused by deposition of IgA in the dermis.
Itchy blistering on extensor surfaces
Dapsone and Gluten Free Diet is management
IgA deposits seen on immunofluorecence
Autoimmune Hepatitis
Autoimmune condition seen in young females associated with HLA B8 and DR3
Three types:
- Type 1 = ANA and or Antismooth Muscle (SMA)
- Type 2 = Anti-liver/kidney Microsomal type 1 antibodies (LKM1) ** CHILREN ONLY**
- Type 3 = Soluble Liver-Kidney Antigen present
- ONLY MIDDLE AGE**
Treated with Steroids and Liver Transplantation
hypertrophic pulmonary osteoarthropathy (HPOA)
Paraneoplastic syndrome with squamous cell and adenocarcinoma Lung cancer which leads to tender and swollen wrists. Associated with clubbing
Bronchogenic carcinoma
Thymoma?
Presents in `60-70 year olds. Most common tumour of anterior mediastinum.
Associated with
myasthenia gravis (30-40% of patients with thymoma)
red cell aplasia
dermatomyositis
also : SLE, SIADH
Anti Mitochondrial Antibody
Primary Biliary Cirrhosis
Anti- Liver/Kidney microsomal Type 1 Antibodies LKM1
Type 2 Autoimmune Hepatitis
Severe Cronhs disease treatment?
Steroids and azithromycin
If still agressive go to biological agents quick
Inflixamab is good for severe disease- also rectal / anal disease
Methotrexate for perianal disease
Hyperosmolar Hyperglycaemic State?
Medical Emergency and tough to manage
Hyperglycaemia causing osmotic diuresis, severe dehydration and electrolyte deficienceies.
Elderly T2 DM is typical
HSS has higher mortality vs DKA with complications like MI, Stroke, Thrombosis, Seizures, Cerebral oedema and central pontine myelinolysis.
HSS takes days therefore dehydration is more severe
Hyperglycaemia causes osmotic diuresis with associated loss of sodium and potassium
Severe volume depletion causes raised serum osmolarity (> 320mosmol/kg) causing hyperviscosity.
Severe electrolyte losses and volume depletion but hypertonicity causes preservation of intravascular volume
Symtpoms: Fatigue, weakness, lethargy, N+V
Lowered conciousness, headaches, papilloedema
Hyperviscosity
Hypotension, tachycardia, dehydration
How to Diagnose HHS
Hypovloaemia
Marked Hyperglycaemia Without Ketonaemia or acidosis
Significan raised serum osmolality (> 320)
Calculate Osmolality with (2 * Na + K) + Glucose + Urea
Treatment of Whipple’s Disease?
IV Cefotaxime for 4 weeks
Then co -trimoxazole for 1 year
Biopsy with PAS staining shows positive macrophages in duodenum
Calculate the Anion Gap
Na + K - Cl - HCO3
Ethylene Glycol Toxicity?
Stage 1: Alcohol intoxication: Confusion, slurred speech dizziness
Stage 2: Metabolic Acidosis with High anion gap and HIGH OSMOLAR GAP
Tachycardia and hypertension
Stage 3: AKI
Treatment of local anaesthetic toxicity?
IV lipid emulsion
History of perioral parathesia, followed by tachy cardia and wide QRS interval, followed by cardiac arrest
ALL shortly after a procedure being started
It is due to IV or excess administration. CNS over activity then depression as lidocain blocks inhibitory pathways then blocks both inhib and activating.
CF Managemet
REgular Physio and postural Drainage High Calorie Diet Vitamin Supplementation Pancreatic Enzyme Supplements Heart and Lung Transplant
IF Delta F508 Mutation Orkambi (Lumacaftor and Ivacaftor) combination therapy can be used
Lumacaftor increases the number of CFTR proteins that are transported to the cell surface
Ivacaftor is a potentiator of CFTR that is already on the cell surface, this increased the probability that the defective channel with be open
Superior vena Cava Obstruction?
Oncological emergency Compression of SVC commonly due to lung cancers or lymphoma SOB is most common symptom Then Swelling of face, neck and arms Headache worse in the morning Dstended neck veins
Small cell Lung Ca, Lymphoma Kaposi's Sarcoma, Breast Ca Aortic Aneurysm Mediastinal fibrosis Goitre Thrombosis
Dexamethasone is management
Acutely Stenting
In the long run, small cell = radio and chemo
Non small cell = radiotherapy
Waterhouse Friedrichsen Syndrome?
Adrenal Haemorrhage likely secondary to TB or Minigococcal infection. Adrenal insufficiency with changes seen on CT
Raynaud’s Disease
Primary Raynaud’s Disease
- Young Women under 30 with bilateral symptoms
- No over rashes or abnormal history
Nifedipine 1st line
IV prostacycline 2nd line
Strongyloidiasis
Sarvae from soil contaminated with faeces migrates in the blood to the lungs. It enters the bronchial tree, causing irritation, coughed up and swallowed. Then in the duodenum and jej it invades the bowel.
Asymptomatic potentially but can have diarrhoea and abdominal pain and bloating but when immunosuppressed they cause auto infection and disseminated disease
This is a Larva Currens picture
Pruritic, linear, urticarial rash
- Intense Pruritus as worms migrate through the skin
- Asthmatics immunosuppression with steroids causes paradoxical worsening of symptoms
If Larvae Migrate to the lungs pneumonitis similar to Loeffler’s syndrome may be triggered
IverMectin and Albendazole are Treatment
Heparin Iduced Thrombocytopenia
HIT
Immune mediated - antibodies form against platelet factor 4 and heparin
These bind to platelets on the surface
Then reduce platelet levels but is a PROTHROMBOTIC state
50% reduction of platelets
Thrombosis
Skin Allergy
Anticoagulants like lepirudin or danaparoid
TAKES A WEEK TO OCCUR!
Kearns Sayre Syndrome?
Mitochondrial Disorder presents < 20 with progressive external opthalmoplegia.
Ptosis develops with horizontal gaze issues.
Patients have Pigmentary retinopathy
Patients get tunnel vision and night blindness
Cardiac conduction defects usually develop and can cause sudden cardiac death
Retinitis Pigmentosa
Peripheral retina pigmentation leading to tunnel vision
- Nightblindness
- Tunnel Vision
- Fundoscopy shows black bone spicule shaped pigment
Associated with
- Refsum Disease: Cerebellar Ataxia, peripheral neuropathy, deafness, ichthyosis
- Usher Syndrome
- Abetalipoproteinemia
- Lawrence-Moon-Biedl Syndrome
- Kearns-Sayre Syndrome
- Alport’s Syndrome
Facioscapulohumeral Muscular Dystrophy?
Autosomal Dominant Mysculodystrophy leading to symtpoms in arm and face
Onset around 20 years old
Trientine?
Copper Chelating used to treat Wilsons
Low Caeruloplasmin?
Wilsons
Kayser-Fleischer Rings?
Green brown deposits at the peripheries of the Iris
Due to deposits in Descement Membrane
ATP7B gene defect?
Chromosome 13
Wilson’s disease
Autosomal Recessive
Wilson’s Disease?
Copper Accumulation due to defective Liver
Deposits in Liver- causing failure
Deposits all over body causing neurological signs (basal Ganglia), Kidney leading to Fanconi Syndrome and Type 2 RTA, Haemolysis and Blue Nails
Cornea - Kayser-Fleischer Rings
Wilson’s Disease Diagnosis?
Low Caeruloplasmin Low Total Copper (Paradoxical) High Free Serum Copper Kayser-Fleischer Rings on Slit Lamp Examination Increased 24 hour urinary collection
Present infection vs Past in Antibodies?
IgM = Ig Mow (NOW) IgG = Ig Gone (Past)
Cocaine Toxicity Treatment?
Start With Benzos
Then Verapamil for palpitations or tachycardia
AVOID Beta Blocker
Dermatitis Herpetiformis?
Dermatitis herpetiformis is an autoimmune blistering skin disorder associated with coeliac disease. It is caused by deposition of IgA in the dermis.
Itchy blistering on extensor surfaces
Dapsone and Gluten Free Diet is management
IgA deposits seen on immunofluorecence
Management of Fibro Myalgia
explanation
aerobic exercise: has the strongest evidence base
cognitive behavioural therapy
medication: pregabalin, duloxetine, amitriptyline
When starting Medication, start a new one for 4 weeks. Then assess response. If no response, stop and trial a different medication.
hypertrophic pulmonary osteoarthropathy (HPOA)
Paraneoplastic syndrome with squamous cell and adenocarcinoma Lung cancer which leads to tender and swollen wrists. Associated with clubbing
Thymoma?
Presents in `60-70 year olds. Most common tumour of anterior mediastinum.
Associated with
myasthenia gravis (30-40% of patients with thymoma)
red cell aplasia
dermatomyositis
also : SLE, SIADH
Erythema ab igne?
Caused by infra red radiation (open fire)
Causes squamous cell skin cancer
Tuberculosis Meningitis?
Longer Prodrome than bacterial meningitis
May be a few weeks unwell with behaviour change
Can get cranial nerve palsy (like malignant meningitis)
Lymphocytes seen in CSF
Low Low Glucose < 50%
High Protein > 1
No organisms will be seen
Severe Cronhs disease treatment?
Steroids and azithromycin
If still agressive go to biological agents quick
Inflixamab is good for severe disease- also rectal / anal disease
Methotrexate for perianal disease
Whipple’s Disease?
Whipple’s disease is a rare multi-system disorder caused by Tropheryma whippelii infection. It is more common in those who are HLA-B27 positive and in middle-aged men.
Whipple’s Disease Symptoms?
Features
malabsorption: diarrhoea, weight loss
large-joint arthralgia
lymphadenopathy
skin: hyperpigmentation and photosensitivity
pleurisy, pericarditis
neurological symptoms (rare): ophthalmoplegia, dementia, seizures, ataxia, myoclonus
Treatment of Whipple’s Disease?
IV Cefotaxime for 4 weeks
Then co -trimoxazole for 1 year
Biopsy with PAS staining shows positive macrophages in duodenum
TCA overdose?
Anticholinergic side effects first:
Dry eyes, blurred vision, sinus tachycardia, nausea, dilated pupils
Then develop:
- Cardiovascular instability
- ECG: sinus tachy, wide QRS and prolonged QT
- Develop Metabolic Acidosis
- Seizures / Coma
Widening QRS > 100 = Seizure prone, 160 = Ventricular arrythmias
Management of TCA overdose?
IV bicarbonate
- first line in hypotension and arrythmias
Indications = wider QRS or Ventricular Arrythmia
Avoid class 1 a and class 1 c antiarrythmics - Flecanide as prolong depolarisation Class III drugs like amiodarone avoid due to prolonging the QT interval
IV lipid emulsion can be used
Dialysis is ineffective
Paragonimus westermani?
This termatode (fluke) infection of the lung presents like TB Prolonged history of productive cough, brown in sputum ? HAemoptysis but not. Then fevers ++
The patients bloods will reveal an eosinophilia and treatment is the Praziquantel
Superior vena Cava Obstruction?
Oncological emergency Compression of SVC commonly due to lung cancers or lymphoma SOB is most common symptom Then Swelling of face, neck and arms Headache worse in the morning Dstended neck veins
Small cell Lung Ca, Lymphoma Kaposi's Sarcoma, Breast Ca Aortic Aneurysm Mediastinal fibrosis Goitre Thrombosis
Dexamethasone is management
Acutely Stenting
In the long run, small cell = radio and chemo
Non small cell = radiotherapy
Optic Neuritis
Unilateral decreased visual activity over hours and days
Poor colour vision - Ischihara plates reduced score
Pain worse on eye movement
Relative Afferent Pupillary Defect
Central Scotoma
IV steroids high dose initially
Recovery is a month
MRI - if > 3 white matter lesions - 50% 5 year risk of developing MS
Causes inclulde
MS
DM
Syphillis
Allergic Bronchopulmonary Aspergillosis?
Allergy to Aspergillus spores. Often in exam there is a history of bronchiectasis and Eosinophilia
Features:
Bronchoconstriction- wheeze, cough, ? prev diagnosis of asthma ? better with bronchodilators/ asthma treatment
Bronchiectasis
Eosinophillia Flitting CXR changes RAST positive test to Aspergillus Postive IgG precipitins Raised IgE
Steroids
Itraconazole is second line
Theophylline?
Like caffeine is naturally occuring methylxanthines
Bronchodilator used in COPD and Asthma
? phosphodiesterase inhibitor increasing cAMP but not entirely known how it works
Poisoning:
- Acidosis
- Hypokalaemia
- Vomiting
- Tachycardia
- Arrythmias
- Seizures
- hyperglycaemia
- Increased Myocardial Contractility
Gastric Lavage < 1 hour
Activated Charcoal
Charcoal haemoperfusion > haemodyalisis
Coombs Test?
Direct Coombs Test- used to detec Immunohaemolytic Anaemia
Take Blood of patient and add Coombs Reagent (Anti Auto Antibodies). This causes agglutination if there are auto antibodies present.
Also used in haemolytic disease of the newborn
Indirect Coombs Test
Prenatal Screening of mother for Rhesus Antibodies
Take Mother blood- take out the Rhesus Antibodies
Then add Rhesus positive RBCs (to cause antibodies to attach to antigens) then add Coombs reagent (antiautoantibodies) This causes again RBC agglutination.
Autoimmune Haemolytic Anaemia?
RBC haemolysis secondary to auto antibodies targeting RBCs causing destruction
Idiopathic
Medication
Underlying Disease Process
RBCs usually 120 day lifetime.
Extrinsic type of haemolytic anaemia Haemolysis occurs in in liver/spleen therefore extra vascular Warm is more common type (> 37 degrees) Cold Rare (0-10degrees)
Warm = IgG
IgG bind to Rh Antigen on RBC and cause antibody dependent cell mediated cytotoxicity. Macrophages, neuts, t cells and NK cells cause haemolysis
Cold = IgM
IgM bind to L I or P antigens. Then compliment pathway causes breakdown in the liver through Membrane attack complex (MAC). This can also occur in introvascularly causing raynaud’s
Haemolysis signs
Increased Reticulocytes Normocytic anaemia Lactate Dehydrogenase levels raised Hb --> Unconjugated Bilirubin increased Haptoblobin levels decrease Haemosiderinuria - Damage kidneys and renal insufficiency
Direct Coombs test detects auto antibodies
Warm C3D and IgG positive
Cold C3D only
Causes of Warm Haemolytic anaemia?
Idiopathic Viral infections SLE Lymphomas Leukemia Penicillin and Cephalosporins
Cold Haemolytic anaemia causes?
Chronic - Leukaemia and Lymphomas
Acute - Viral Pneumonia, Mycoplasma, Infectious Mononucleosis
Haemolytic Crisis
Bounding heart rate SOB Multiorgan failure Jaundice Fatigue Hepatosplenomegaly
Treatment of Autoimmune Haemolytic Anaemia?
Warm - Steroids and splenectomy
Cold - none required
Latent Autoimmune Diabetes of Adulthood?
Subtype of Diabetes in which patients present with phenotypic features of Type 2 DM whilest displaying the prescence of makrers of autimmunity ( Anti GAD antibodies)
30-40 year olds
Oral hypoglycaemic agents are used
B cell function may decline and may require progressive insulin
BTS guidelines for lung Nodules?
Nodule < 5mm or clearly benign or unsuitable for treatment - discharge
Nodule 5-6mm CT in 1 year
Nodule > 6-7mm - 3 months CT
Nodule > 8 mm and Low Risk - 3 month CT
Nodule > 8mm and high risk (via Brock Model) - CT PET
IF CT PET shows high uptake - Biopsy
Secondary Pneumothorax
If patient > 50 and pneumothorax rim is > 2cm OR PATIENT IS SYMPTOMATIC = Chest Drain
If patient > 50 and pneumothorax rim is 1-2cm
- Aspirate
If fails- still > 1 cm or symptomatic = Chest Drain
If patient > 50 and pneumothorax rim is < 1 cm = admit and oxygen
Primary Pneumothorax
Primary Pneumothorax < 2 cm and not SOB = discharge
If > 2cm or SOB = Aspirate (if fails - chest drain)
Patients should be advised to stop smoking
Lights Criteria
Use when protein 25-30
> 30 is Exudate, < 30 is Transudate. Lights used for inbetween
Lights: if one of the following true then likely Exudate
Pleural fluid protein / Serum protein = >0.5
Pleural fluid LDH / Serum LDH = > 0.6
If Pleural fluid LDH is 66% of normal range of serum LDH
Viridans sterptococcus
Risk Factor is poor Dentition
Membranous Glomerulonephritis
Commonest type of glomerulonephritis
3rd most common cause of ESRF
BM is thickened with subepithelial electron dense deposits. Creating a spike and dome appearance
Idiopathic is due to antiphopholipase A 2 antibodies
Drugs include Penicillamine, NSAIDs and Gold
SLE Thyroiditis and rheumatoid
Management:
ACEi or ARB
These reduce proteinurea and improve prognosis
Then Immunosupression
Steroids + Cyclophosphamides is often used
Consider Anticoagulation
Prognosis of Membranous Glomerulonephritis
1/3 Remission
1/3 Protein urea
1/3 ESRF
Good prognosis :
-females
Young presentation
Asymptomatic
McArdle Disease?
Glycogen Storage Disease
Myophosphorylase deficiency or glycogen storage Disease V
Presents in adolescence and presents with exersis in tolerance, cramps and weakness. Unfortunately chronic fatigue is often a mysdiagnosis
Autosomal Recessive
- No venous blood lactate rise on exercise
- Muscle biopsy shows elevated glycose concentration and muscle phosphorylase deficiency
- elevated CK and Myoglobinuria
Forarm muscle exercise testing or genetic testing is diagnositic
Mx: Avoidance of low carb diets and low intensity aerobic exercise
Gaucher disease
Lipid Storage Disease
Genetic Disorder in which glucocerebroside accumulates in cells and organs
Most common lipid storage disorder
- Easy Bruising
- Fatigue
- Anaemia
- Thrombocytopenia
- Hepatosplenomegaly
ASEPTIC necrosis of the femur
Deficiency of glucocerebrosidase
Leading to glucocerebroside accumulations in macrophages and therefore: spleen, liver, kidneys lungs brain and bone marrow
Commoner in Ashkenazi Jews
Von Girkes Disease
Glycogen Storage Disorder
Glucose - 6 - Phosphatase deficiency
Hepatic Accumulation of Glycogen
Leads to Hypoglcyaemia, Lactic Acidosis and Hepatomegaly
Pompe’s Disease
Glycogen Storage Disorder
Lysosomal Alpha 1, 4 Glucosidase Deficiency
Cardiac, Hepatic and Muscle Glycogen accumulation. Features include cardiomegaly
Cori Disease
Glycogen Storage Disorder
Alpha 1, 6 Glucosidase Deficiency
Hepatic and Cardiac Accumulation - leading to muscle hypotonia
Dual immunomodulator and biological therapy in Crohns has increased risk compared to biological alone?
Increased risk of non melanoma skin cancer
Infliximab risks
Hypersensitivity CCF Aplastic Anaemia Reactivation of TB Skin cancer (in combination with azothiaprine)
Hypokalaemic Periodic Paralysis
Rare Autosomal Dominant disorder with episodes of paraylsis typically at night
Mutation in muscle voltage gated calcium channels
Can be precipitated by carb meals
History of exercise
Life long Potassium replacement
Indications for Plasma exchange in ANCA associated Vasculitis?
Severe Active Renal disease (Cr > 350)
Pulmonary haemorrhage
Concurrent Anti - GBM Auto Antibody disease
Indications for plasma exchange?
Guillain Barre Syndrome
Myasthenia Gravis
Good Pastures syndrome
ANCA positive vasculitis (pulm haem, acute renal failure)
TTP/HUS
Cryoglobulinaemia
Hyperviscosity syndrome (2ndary to myleoma)
Complications of plasma Exchnage?
Hypocalcaemia Metabolic Alkalosis Systemic Medication removal Coagulation factor depletion Immunoglobulin depletion
Cryoglobulinaemia
This is the presence of circulating proteins which precipitate in the cold. Commonly associated with hepatitis C infection.
Three types
1 - monoclonal (25%)
2 - Mixed mono and poly (usually rheumatoid factor) (25%)
3 - Polyclonal (usually rheumatoid factor ) (50%)
Type 1:
- IgG or IgM
- Multiple Myeloma
- Waldenstrom Macroglobulinaemia
Type 2:
mixed monoclonal or polyclonal (usually Rhematoid Factor)
Associated: Hep C, Sjogren’s, Lymphoma and Rehumatoid Arthritis
Type 3:
Polyclonal - usually with Rheumatoid factor
RA and Sjogrens
Symptoms:
- Raynaud’s only seen in type 1
Cutaenous- vascular purpura, distal ulceration and ulceration
- Arthralgia
- Renal involvement (diffuse Glomerulonephritis)
Tests: Low complement (especially c4)
High ESR
Immunosuppression and plasmapheresis
Can cause a peripheral neuropathy from small vessel vasculitis- sensory or sensory motor peripheral neuropathy
Fabry’s disease:
X-linked lysosomal storage disorder that causes a painful peripheral neuropathy due to deposition of glycosphingolipids within small sensory fibres. (nerve conduction normal as large fibres uneffected)
Chronic inflammatory demyelinating polyradiculoneuropathy CIDP
This is prominently motor neuropathy often affecting proximal and distal muscles. There is sensory involvement with vibration and proprioception. Show Conduction slowing reflecting demyelination rather than amplitudes which suggests axonal loss
Demylinating peripheral neuropathy (slowing of conduction on conduction studies)
Guillain Barre Syndrome
CIDP (Chornic inflammatory Demyelinating polyradiculoneuropathy)
Amiodarone
Hereditary sensorimotor neuropathies type 1
Paraprotein neuropathy
Axonal Pathology
Alcohol DM Vasculitis B12 Hereditary sensorimotor neuoropathy type 2
C5, 6
Deltoid
Biceps
Brachioradialis
C5, C6, C 7
Serratus Anterior (paraylsis - winging of scapula) Triceps
C8
Finger Flexors
Stills Disease
A Systemic Inflammatory condition of unkown aetiology but often thought to be secondary to an infectious trigger on the background of a genetic predisposition.
Presents in young adults 15-25 yo peak.
Fever and new non pruritic rash
Basically - graham Nash with A rash
Joint pain not swelling
All negative screens
GIVE NSAIDS unlike Graham Nash
How to diagnose Still Disease?
Yamaguchi criteria
PAtients need all major criteria and 2 minor
Major: Fever 39 degrees > 1 week
Arthralgia > 2 weeks
Non pruritic or maculopapular rash
Lecuocytosis
Minor:
Sore throat, lymphadenopathy, hepatomegaly or splenomegaly, LFT derangement, ANA negative and rheumatoid factor negative
Stills Disease Fever, Rash and other key features
Tends to spike daily or twice daily
Rash is salmon coloured on trunk or the soles, palms and face
Knees and wrists are common joint involved
Ferritin rises are characteristic as well
Stills Disease Treatment?
NSAIDS
NSAIDs for fever joint pain and serositis
Then Steroids or D MArds
Superficial Thrombophlebitis
Inflammation associated with thrombosis of one of the superficial veins (usually long saphenous vein of the leg.
20% of superficial thrombophlebitis have underlying DVT and 4% will progress to DVT if untreated.
Treatment with oral NSAIDs, stockings and Prophylactic dose Enoxaparin for 30 days as higher risk of DVT
C-telopeptide
Sensitive marker of increased bone turnover observed in Pagets disease and useful in monitoring disease progression or treatment efficacy
Paget’s disease
Increased but uncontrolled bone turnover
Osteoclastic disorter
Increased osteoclastic resorption and then increased osteoblastic activity
UK - 5%
Older man with pone pain and isolated raised ALP
ALP raised
Calcium and phosphate are normal
PINP (procollagen type 1 N-terminal propeptide), serum C telopeptide, urinary N telopeptide and urinary hydroxyproline are raised These are all markers of bone turnover
Indications for treatment:
Bone Pain, Skull or long bone deformity, fracture, periarticular pagets
Treated with bisphosphonates
Complications of pagets
Deafness Bone Sarcoma 1% of patients Fractures Skull Thickening High Output Cardiac Failure
Acute intermittent porphyria
Rare Autosomal Dominant condition with a defect in porphobilinogen deaminase - biosynthesis of heam.
Toxic accumulation of dela aminolaevulinic acid and porphobillinogen
Abdominal pain with neuropsychaiatric symptoms in a 20-40 year old female (Christie)
Classical presentation is a combination of abdominal, neurological and psychiatric symptoms:
- Abdominal pain and vomiting
- Motor Neuropathy
- Psychiatric - depression / acute agitation
- Hypertension and Tachycardia
Diagnosis of acute intermittent porphyria
Urine turns red on standing
Raised urinary porphobilinogen
Assay of red cells for pophobilinogen deaminase
Typhus
Rickettsial Disease
Can cause widespread vasculitis
- Fever, Headahce
- Blakc Eschar at site of inoculation
- Maculopapular or vasculitic rash
Deranged clotting, renal failure and DIC, low platelets
Interstitial infiltrates
Treatment of Rickettsia disease
Doxycycline
Chloramphenicol
Prussian Blue
Used to treat Thallium Poisoning
Thallium Poinsoning symptoms?
Painful peripheral neuropathy Abdominal pain Diarrhoea and vomitting Ataxia Sepia tinge to vision Reduced visual acuity Cranial nerve palsy Minimal body hair / alopecia Glossitis Mood issues
Occupation: Electroplating
Treated with Prussian Blue
TRIAD: Fluctuant mood, painful distal parasthesia and Alopecia = Pathognomonic
Indication to leave a chest drain in in infective pleural effusion?
pH < 7.2
Purulent aspirate
Kartagener’s Syndrome
Primary Ciliary Dyskinesia
- Bronchiectasis
- Recurrent sinusitis
- Otitis Media
- Subfertility
Dextrocardia / Sinus Invertus
Patients are tested by putting sweet in the nose. If they don’t tase after 20 mins then they have ciliary dyskinesia
Bronchiectasis Causes:
Infective:
- TB
- Measles
- Purtussis
- Pneumonia
CF
Immune Deficiency:
- IgA
- Hypogammaglobulinaemia
Allergic Bronchopulmonary Aspergillosis
Ciliary Dyskinetic Syndromes
Kartageener’s syndrome
Youngs syndrome
Yellow Nail Syndrome
Toxoplasmosis in HIV
Multiple Lesions
Ring or nodular enchancement
Thallium SPECT negative
50% of cerebral lesions in patients with HIV
Treatment is with Sulfadiazinde and pyrimethamine
Primary CNS Lymphoma
30% of cerebral lesions in patients with HIV
EBV association
Single homogenous enhancing lesion
Treatment with steroids and methotrexate (chemo) and consideration for sugery
Other Neurological differentials in HIV
- Toxoplasmosis
- CNS lymphoma
- Encephalitis: CMV or HIV itself
Can also be HSV
CT shows oedematous brain
- Cryptococcus Most common fungal infection of CNS - Headache, fever, seizures, focal deficit CSF - high opening pressure India Ink Test Positive
- Progressive Multifocal Leukoencephalopathy
PML
Widespread demyelination
Due to JC virus - behavioural changes, speech, motor, visual impairment
Single or multiple lesions on CT w/o mass effect and don’t usually enhance
MRI shows demylination
Aids Dementia Complex
- Caused by HIV virus itself
- behavioural changes and motor impairment
- CT cortical and subcortical atrophy
Pneumothorax - when can you fly again?
1 week following resolution of chest x ray
Inferior MI
II, III and AVF
Right Coronary Artery thrombus
Anterior MI
V1-V4
Left Anterior Descending
Lateral MI
V5, 6 and I
Circuflex artery
Malaria Falciparum
MOST SEVERE Malaria
Causes Cytoadherence to block spleen blood flow and cause ischemic damage
Need to decide if severe or not
Then need to highlight any complications
Severe:
- Schizonts (last stage before lysis of RBC and increased viral load)
- Parasitaemia > 2%
- Hypoglycaemia
- Acidosis
- Temp 39
- Severe Anaemia
- Any complications
Complications:
- Cerebral Malaria - seizures and coma
- Acute Renal failure (blackwater fever)
- Acute Respiratory Distress
- Hypoglycamia
- DIC
SEVERE DISEASE: Treat with IV Artesunate
> 10% parasite = EXCHANGE TRANSFUSION
IF shock - then treat with antibiotics as well
For non severe disease: artemisinin based combo therapys are recommended
Sickle cell immunity to Malaria = how does it work?
No duffy antigen
Therefore Plasmodium Vivax cannot enter cells
Other immunity to Malaira?
Thalassemia and G6PD increase likelyhood that infected RBC will dye from oxidative stress
This gives a level of immunity
P Malariae Fever?
Quartan Fever- 72 hours
P vivax and P ovale fever?
Tertian Fever- 48 hours
P Knowlesi
Fever every 24 hours
P Falciparum
Fever varies - Malignant Tertian Fever
Patients that don’t benefit from Lung Reduction surgery in COPD?
Non Upper Lobe empysema
High Exercise Capacity
Microscopic Colitis
Occurs in association with PPI use
History of chronic watery diarrhoea with increased frequency
Statins and SSRIs can also cause it
Colonoscopy and biopsy is the way to confirm the diagnosis
Anti TTG antibodies
Non invasive confirmation of coeliac disease
Where negative, but still clinically coeliac, can go onto upper GI endoscopy and biopsy
Faecal calprotectin
Screening test for active Crohn’s and UC
Facal Elastase
Used to evaluate pancreatic insufficiency
Carcinoembryonic antigen?
Used as Tumor marker for colorectal cancer
Inclusion Body Myositis
Cause of Myopathy
Associated with cytoplasmic inclusions on mm biopsy
Older males with proximal and distal muscles
Quads fingers and wrist flexors
Raised CK
Drug Induced Lupus
Anti histone antibody positive
ANA postiive 100%
Anti dsDNA negative
Drugs that cause Drug Induced Lupus
Procainamide Hydralazine Isoniazid Micocycline Phenytoin Penicillamine
Chickenpox infection in adults
Primary infection with varicella zoster virus
Shingles is the reactivation of the dormant virus in dorsal root ganglion
Highly infectious Respiratory spread Can be caught of shingles patient 4 days before rash, 5 days after day 1 of rash 10-21 day incubation
Symptoms: - fever - itchy rash starting on head/trunk before spreading - Macular then vesicular Systemic upset
Tx: keep cool
Trim nails
5 days off after rash started
IVIG for immunocomprimised or newborns
Common complication is bacterial infection
NSAIDS increase this risk
Can develop cellulitis
Can also develop invasive group a strep infection
This can be Nec Fasc
- out of proportion pain for symptoms of erythematous rash
Other complictions include
- pneumonia
- Encephalitis
- Disseminated haemorrhagic chicken pox
- Arthritis
Rapidly progressive Glomerulonephritis
Term for rapid loss of renal function assciated with formation of epithelial crescents
- Good Pastures Syndrome
- Wegener’s Granulomatosis
- SLE
- Microscopic polyarteritis
PRESENTS AS NEPHRITIC SYNDROME
- red cell casts, proteinuria, hypertension, oliguria
Treated with immunosuppression and plasmapheresis
Anti coagulation
Type 1 - Anti-GBM antibody (Goodpasture Sydrome) - linear on immunofluorecence
Type 2 - Immune complexes (post strep, Lupus, IgA, HSP)
Granular on immunofluorecence
Type 3 - Pauci - Immune (ANCA positive)
No immunofluorecence
Cardiac Amyloidosis
ECG shows low voltage complexes with poor R wave Progression in the chest leads
This is common in Myeloma
Progressive Multifocal Leukoencephalopathy
is an oppurtunistic infection by the JC virus that only occurs in patients who are immunocomprimised.
Natalizumab has a 2.1 in 1000 risk of developing it.
Multifocal demyelination
Presents with sub acute behaviour change, speech, motor and visual impairment
Multiple Slcerosis Treatment:
Reduce the frequency and duration of relapses - No cure
Acute replase:
High dose steroids - shorten the relapse but not recovery
DMARDS
beta interferon reduces relapse rate by 30%
Criteria for beta interferon:
- Relaps, Remiting disease: 2 r in past 2 years and able to walk 100m
- Secondary progressive disease: 2 r in past 2 years and able to walk 10 m
Glatiramer acetate: Immune decoy
Natalizumab: alpha 4 and beta 1 integrin antagonsit found on leucocytes
Fingolimod
Other issues: Fatigue: - Exclude anaemia / hypothyroid Treat with amantadine mindfullness CBT
Spasticity: Baclofen and Gabapentin
Bladder Dysfunction
- urgency, incontinence and overflow
- Guidelines say get US first
- If significant residual volume - self catheterise
- if no signficant residual volume - anticholinergics
Oscillopsia (visual fields oscillate)
- Gabapentin
If about to treat malaria what should you check?
G6PD deficiency
Primaquine, Cipro and sulphonamides cause haemolysis
Lansoprazole interactions
hyponatraemia
Hypomagnesmia
Osteoperosis
Microscopic colitis
Increased C.Diff
Reduced HIV antiretroviral efficiency (atazanavir, Eviplera)
Reduced Methotrexate clearance (omeprazole and aspirin)
Donepezil adverse effects
Is a cholinesterase inhibitor used to treat mild to moderate dementia
It has vagotonic effects that lead to bradycardia and heart block
Pharmacological management of dementia?
1st line is acetylcholinesterase inhibitors:
Donepezil, glantamine and rivastigmine (as used in MG)
This is for Mild to moderate Alzheimers
2nd Line is Memantine (NMDA receptor Antagonist)
- Add on or monotherapy severe Alzheimers
- start if intollerant of first line in moderate disease
Hyperaldosteronism treatment
Primary Hyperaldosteronism
Commonly caused by an adrenal adenoma (CONNS)
However, bilateral adrenal hyperplasia is actually now 70% of cases
Treat conns with surgery but BAH with spironolactone, so differentiating is imporant
Signs and symptoms:
- Hypertension (due to high Na)
- Hypokalaemia (can present with muscle weakness)
- Alkalosis
Aldosterone/renin ratio is the first line investigation
High aldosterone with low renin levels should be seen
Then, high resolution CT with adrenal vein sampling to see if bilateral or unilateral sources of aldosterone excess
If unilateral - surgery
If bilateral adrenocortical hyperplasia - spironolactone
Paraxysmal Noctural Hemoglobinurea
Dark Urine, Haemolytic Anaemia and Thrombosis
Due to an acquired genetic mutation in the PIGA gene. This codes for GPI - the anchor protein to CD 55 and CD 59
These are both Complement Regulatory Proteins
This means they help the complement system (alternative pathway that reacts to bacterial endotoxins and forms the MAC) to differentiate from self and non self
CD 55 and CD 59 are found on RBC, Neutrophils and Platelets
Without GPI then there is no CD 55 and CD 59
This causes unregulated complement activation and therefore Intrinsic, intravascular, Haemolysis
There is haemolysis throughout the day
Then at night urine is concentrated so then in the morning it looks like there is increased blood in urine hence the name
Complications are thrombosis (commonest cause of death), Irone Def Anaemia (haemoglobin loss) and AML
Diagnosis of PNH
HAM test positive
Flow Cytometry is gold standard
Treating PNH
Iron, RBC transfusion
Ecluzimab - binds to C5 and therefore stops MAC formation
Stem cell transplant
Ascarasis
Due to infection with roundworm Ascaris lumbricoides
Infections begin in gut following ingestion, then penetrate duodenal wall to migrate to lungs, coughed up and swallowed, cycle begins again
Diagnosis is made by identification of worm or eggs within faeces
Treatment is with mebendazole
May have loffler’s syndrome then GI history
Contrast seen in worm on bareum enema
Myoxedmea Coma
Give IV T3 and T4 + Steroids
Presents with hypothermia, low GCS, bradycardia, hypotension
Need to rule out addisons as well
Hypercalcaemia management
The initial management of hypercalcaemia is rehydration with normal saline, typically 3-4 litres/day. Following rehydration bisphosphonates may be used. They typically take 2-3 days to work with maximal effect being seen at 7 days
Other options include:
calcitonin - quicker effect than bisphosphonates
steroids in sarcoidosis
- Fluids
- Bisphosphonates
- CALCITONIN
Steroids for Sarcoidosis
Think about Furosemide in specialist circum
Loop diuretics such as furosemide are sometimes used in hypercalcaemia, particularly in patients who cannot tolerate aggressive fluid rehydration. However, they should be used with caution as they may worsen electrolyte derangement and volume depletion.
Indication for Mitral Valve Replacement
- EF < 60%
- Left ventricular end systolic diameter > 40mm (LV Dilation or Hypertrophy)
- New onset of AF or
- Pulmonary Hypertension > 20mmHg
If not 6 monthly ECHO
No need for prophylaxis (only in prostetic repair or replacement)
Diagnosis of Diabetes?
If the patient is symptomatic:
fasting glucose greater than or equal to 7.0 mmol/l
random glucose greater than or equal to 11.1 mmol/l (or after 75g oral glucose tolerance test)
This needs to be demonstrated twice in an aysmptomatic patient
HbA1c of > 48mmol/L (6.5%)
Diagnosis of Prediabetes?
Prediabetes is split into 2 dependent on the Diagnostic Test used or abnormal
Impaired fasting Glucose: A fasting glucose greater than or equal to 6.1 but less than 7.0 mmol/l implies impaired fasting glucose (IFG)
IFG: Fasting Glucose 6.1-7.0 mmol/L
Impaired Glucose Tollerance
OGTT 2-hour value greater than or equal to 7.8 mmol/l but less than 11.1 mmol/l
HbA1c
> 48mmol/L = Diabetes (6.5%)
If < 48mmol/L = need fasting glucose or OGTT as this doesn’t exclude diabetes
Radioiodine therapy following CT Contrast?
Wait 8 weeks before starting
Haemangioblastomas
Cause a paraneoplastic syndrome where they release EPO
This leads to a very high Hb
Seen in Von Hipple Lindau syndrome
Have a very good prognosis if they are ameanable to surgical resection
Combined Pulmonary Fibrosis and Emphysema
CPFE is characterized by exertional dyspnoea, upper-lobe emphysema and lower-lobe fibrosis, preserved lung volume and severely reduced capacity of gas exchange. The preserved lung volumes are thought to arise because of the counterbalanced effects of hyperinflation from emphysema and the restrictive effects of pulmonary fibrosis. Both mechanisms lead to reduced gas exchange, hence the significantly reduced DLCO.
Idiopathic Pulmonary Fibrosis
Ongoing repair process of having excess collagen / scar tissue in the interstial lung tissue
Type 2 pneumocytes over preliforate and too much collagen is deposited by myofibroblasts
Reduced myofibroblast apopotosis
Reduced blood oxygenation as distance between alveolai and capillary is increased
Excess collagen also causes increased lung stiffness, making ventilation more difficult
This is restrictive lung disease, interstitial lung disease.
- Reduced Total Lung Capacity
- Reduced Force Vital Capacity
- Reduced Force Expitory Volume in first second
Cysts plus thick walls - honeycombing
Progressive therefore symptoms progress overtime
Clubbing
Respiratory failure
Investigation
Chest CT
Spirometry
Treatment is supplimental oxygen and lung transplant
Old age, Male, Tobacco smoker
Life Expectancy from Diagnosis is 3-4 years
LTOT in COPD
Assessment is done by measuring arterial blood gases on 2 occasions at least 3 weeks apart in patients with stable COPD on optimal management.
Offer LTOT to patients with a pO2 of < 7.3 kPa or to those with a pO2 of 7.3 - 8 kPa and one of the following:
secondary polycythaemia
peripheral oedema
pulmonary hypertension
Don’t offer to smokers who don’t want to give up
Assess risk of falls and fires
Protein C deficiency
Protein C deficiency
Protein C deficiency is an autosomal codominant condition which causes an increased risk of thrombosis
Features
venous thromboembolism
skin necrosis following the commencement of warfarin: when warfarin is first started biosynthesis of protein C is reduced. This results in a temporary procoagulant state after initially starting warfarin, normally avoided by concurrent heparin administration. Thrombosis may occur in venules leading to skin necrosis
Organophosphate insectiside poisoning
One of the effects of organophosphate poisoning is inhibition of acetylcholinesterase leading to upregulation of nicotinic and muscarinic cholinergic neurotransmission. In warfare, sarin gas is a highly toxic synthetic organophosphorus compound that has similar effects.
Features can be predicted by the accumulation of acetylcholine (mnemonic = SLUD) Salivation Lacrimation Urination Defecation/diarrhoea cardiovascular: hypotension, bradycardia also: small pupils, muscle fasciculation
Management
atropine
Restrictive Cardiomyopathy?
Restrictive cardiomyopathy
Causes
amyloidosis (e.g. secondary to myeloma) - most common cause in UK
haemochromatosis
post-radiation fibrosis
Loffler’s syndrome: endomyocardial fibrosis with a prominent eosinophilic infiltrate
endocardial fibroelastosis: thick fibroelastic tissue forms in the endocardium; most commonly seen in young children
sarcoidosis
scleroderma
Pathophysiology
primarily characterized by decreased compliance of the ventricular endomyocardium
causes predominately diastolic dysfunction
Features
similar to constrictive pericarditis
low-voltage ECG
Features suggesting restrictive cardiomyopathy rather than constrictive pericarditis
prominent apical pulse
absence of pericardial calcification on CXR
the heart may be enlarged
ECG abnormalities e.g. bundle branch block, Q waves
Investigations
echocardiography
cardiac MRI
Hereditary Haemorrhagic Telangiectasia
HHT is autosomal dominant condition - Multiple Telangectasia over skin and mucous membranes
2/ 4 = possible
3/4 = Definite
- Epistaxis
- Telangiectases
- Visceral Lesions (GI tract, or pulm, hepatic, or cerebral AVMs)
- Family History (first degree)
Alpha Thalassemia Gene Mutation?
Autosomal Recessive
Deletion of the Alpha Globin Genes on Chromosome 16
2 pairs of genes
1 defect = silent carrier
2 defect = thalaseamia minor
3 defect = HbH disease - Severe anaemia and hepatosplenomegaly
4 defect -= Bart’s Hydrops Fetalis - incompatabile with life
Alpha Thalassemia Diagnosis
- Hemoglobin Electropheresis (increased band at HbH)
- Genetic Testing
- Fetal Sampling - amniocentesis
Have Haemolysis and Extravascular haemolysis
Get Jaundice
Hypoxia - Increased RBC production
Bones to enlarge and Hepatospenomegaly
Treatment of Thalassemia
SEVERE only
- Blood TRansfusions
- Iron Chelating agents
Fetal : Intrauterine blood transfusions
Bone Marrow Transplants
Beta Thalassemia
Point Mutation in Beta Globin Gene on Chromosome 11 Causes reduced (B+) or abscent Beta Globin (BO)
Autosomal Recessive therefore can have traight or mild disease if 1 or severe disease if genes from both parents:
1 x B+ = Minor
1 x BO = Minor
2 x B+ = Beta Thalassemia Intermedia
2 x BO = Beta Thalassemia Major
Adult Hb
HbA x2 and HbB x2
Fetal Hb
HbA x 2 and Hb gamma x 2
Beta Thalasemia Symptoms
Minor - Asymptomatic
Beta Thalassemia Major - Start at 6 months as Fetal hb still exists
Symptoms: Anaemia Jaundice Hepatosplenomegaly Haemochromatosis Growth Retardation
Frontal Bossing
Chipmunck Facies
Hair on End Skull x ray
Diagnosis
Low Hb Low MCV (Very Low) Increased RDW (different sizes due to immature retic) Film: Microcytic and hypochormic Target cells
High Fe
High Ferritin
High Transferritin Sat Level
Haemoglobin Electrophoresis
Low HbA
High HbF
High HbA2 levels
Beta Thalassemia major Treatment
Blood Transfusions
Iron Chelating Agents
Splenectomy if hepatosplenomegaly