Path Flashcards
Diagnostic criteria of SIADH
Low plasma sodium (< 135)
* Low plasma osmolality (< 270)
* High urinary sodium (> 20)
* High urinary osmolality (> 100)
* No adrenal/thyroid/renal dysfunction
Sodium in DI?
High
Treatment for high potassium?
- IV calcium gluconate
- IV insulin with dextrose
If potassium is low, remember to check what?
Magnesium level
What to do if high potassium level?
Check again before treating
A patient has had hypertension at a young age and the following blood test results on his U&Es: Na 147, K 3.2, urea 5.0, Cr 70.
What is the next best investigation to confirm the likely diagnosis?
Aldosterone renin ration
Effect of calcitonin?
Less bone reabsorption by osteoclasts
Decreased Ca reabsorption at
DCT
Severe low calcium treatment
IV calcium gluconate
What has lowest calcium: osteomalacia or secondary hyperparathyroidism?
Osteomalacia
Management of hypercalcaemia in the acute setting is?
Fluids, fluids, fluids
Commonest cancers that can metastasise to the bone are?
Prostate, breast, lung
Normal anion gap level?
14-18
Normal plasma osmolality?
275-295
Marker of acute liver dysfunction?
INR/PT
Should urobilinogen be in urine?
YES
Raised AST:ALT > 2:1?
Alcoholic hepatitis
Raised AST:ALT < 1:1
Viral hepatitis
ALT/AST in the 1000s
Acute viral hepatitis, ischaemic hit, toxins
Antibodies in Hashimoto’s disease
Anti-thyroid peroxidase, anti thyroglobulin
Primary atrophic - goitre or no goitre?
No goitre
Treatment for myxoedema coma
I.V Liothyronine
Subclinical hypothyroidism results?
Pre-hypothyroid
Pituitary gland can compensate
High TSH, normal T3/4
If positive anti TPO Ig then higher risk of hypothyroidism later
Radiolabelled iodine uptake scan.
Multiple nodules?
Toxic goitre
Radiolabelled iodine uptake scan.
Generalised increase
Grave’s disease
Radiolabelled iodine uptake scan.
De Quervain’s sign?
Cold thyroid
Radiolabelled iodine uptake scan. What is seen with adenomas??
Focal lesions
Graves’ specific signs and symptoms?
Pretibial myxoedema (soft tissue growth at the shins and skin changes), graves’ orbitopathy is also another specific sign (caused by retrobulbar soft tissue growth), and is characterised by lid lag, exopthalmos and opthalmoplegia.
Medical management of hyperthyroidism
include carbimazole and propylthiouracil.
There are five indications for a thyroidectomy (either full or partial) - name them
)Treatment resistant graves, suspicion of malignancy, cosmetic, or co-existing hyper-parathyroidism.
It is important to ensure patients are euthyroid before radio-iodine or surgery because the treatment / operation can both induce thyroid storm.
Acromegaly Ix
Oral glucose tolerance test
Measurement of GH
Plasma IGF-1
Hashimoto’s can cause which thyroid tumour?
Lymphoma
Psammoma bodies in which thyroid cancer?
Papillary
What stimulates prolactin?
TRH
CPFT: combined pituitary function test - what is given?
GnRH, TRH and insulin
Which blood marker is monitored to check for recurrence of papillary thyroid carcinoma post resection?
Thyroglobulin
Which medication is used for hyperthyroidism?
Carbimazole
Commonest cause of hypothyroidism in the UK?
Hashimoto’s
Reticularis secretes what?
Sex hormones
What does the adrenal medulla produce?
Catecholamines
What does the adrenal medulla produce?
Catecholamines
Purpose of high dose dexamethasone test?
Helps to determine Cushing’s syndrome from disease
What is Cushing’s disease?
Cushing disease occurs when Cushing syndrome is caused by an ACTH-producing pituitary tumour, whereas Cushing syndrome is the set of symptoms that results when there is a surplus of cortisol in the body.
Treatment of Conn’s syndrome?
Spironolactone
Sulphonylurea
gliclazide
DPP-4 agonists
Sitagliptin
SGLT-2 inhibitors
Empagliflozin.
Add GLP-1 antagonist
Liraglutide
DKA criteria:
Ketones >3
pH <7.3
BM >15
A patient presents with new-onset type 2 diabetes, an enlarged jaw and forehead and carpal-tunnel syndrome. Which investigation would be most useful to diagnose the likely cause?
Short SynACTHen test
Combined pituitary function test
Measurement of plasma [growth hormone]
Low-dose dexamethasone suppression test
Oral glucose tolerance test
c)
Sign of AML?
Auer rods
Acute Promyelocytic Leukaemia
T(15;17)
Presents with DIC. Good prognosis
All-Trans Retinoic Acid (ATRA)
Forces cells to differentiate, stops proliferation
Ruloxitnib is what?
- JAK inhibitor
CML association?
Philadelphia chromosome - treat with imatinib
How is 9:22 dected?
FISH
Blast phase of CML?
> 20% blasts in bone marrow
Behaves like an acute leukaemia
Accelerated of CML?
> 10% blasts in bone marrow
Sign of CLL?
Smudge cells
Richters syndrome:
Transformation of CLL to aggressive disease (ALL / high grade lymphoma)
Staging of CLL?
A – no cytopenia, <3 areas of lymphoid involvement
B – no cytopenia, 3+ areas of lymphoid involvement
C – cytopenias
A – watch and wait
B – consider treatment
C – treat
Treatment for CLL?
Venetoclax (BCL2)
Obinutuzumab (CD20)
Ibrutinib (Brutons TK inhibitor)
FCR (fludarabine, cyclophosphamide, rituximab)
> 20% blasts = What?
AML
Most common Hodgkin lymphoma?
Nodular sclerosing is the most common type
MGUS
Serum monoclonal protein <30g/l
Plasma cells <10% on Bone Marrow
Smouldering myeloma
Serum monoclonal protein (IgG / IgA) >30g/l or Bence Jones Protein
And/or
Clonal bone marrow plasma cells 10%-60% in the marrow
waldenstrom’s
lymphadenopathy, weight loss, splenomegaly
IgM paraproteins
55 year old man presents to his GP with lethargy, fatigue and lymphadenopathy. Blood results show: WCC 7 Hb 90 MCV 80 Na 140 K 4.0 Creatinine 90 Calcium 2.5
Serum electrophoresis shows an IgM paraprotein of 37 g/l
What is the most likely diagnosis?
Acute leukaemia
Multiple Myeloma
Smouldering Myeloma
MGUS
Waldenstrom’s Macroglobulinaemia
E)
55 year old man presents to his GP after a 2 week history of fatigue and easy bruising. Blood results show:
WCC 27 Hb 90 Plt 30
Na 140 K 4.0 Creatinine 90 Calcium 2.5
Blood film shows presence of blasts (see below) with 55% blasts in marrow. Flow cytometry shows a clonal population of cells expressing CD34, MPO, CD13, CD33.
AML
ALL has which cells?
Hand-mirror cells
Do flow cytometry
TREMATODA- flukes?
Schistosoma spp.
Fasciola hepatica
CESTODA- tapeworms
Taenia solium
APICOMPLEXA
Toxoplasma gondii
Plasmodia spp
Complication of taenia solim?
Cysterciocisis (in the brain)
Treatment of neurocysticercosis
Steroids
Anti-convulsants
Anti-parasitics
Surgery
How does hookworm infect?
Penetrates skin
Schistoma affects what organ?
Liver
Treatment for schistomiasis?
Praziquantel
Name the process by which a strain of influenza may rapidly modify whole segments of its genome?
Antigenic shift
What step in the influenza replication cycle does tamiflu inhibit?
Cell exit
Which Plasmodium species causes cerebral malaria?
Plasmodium ovale
Plasmodium knowlesi
Plasmodium falciparum
Plasmodium vivax
Plasmodium malariae
Plasmodium falciparum
What is Toxoplasma gondii’s definitive host?
Domestic cat
Which organism is the leading cause of adult onset seizures in the developing world?
Taenia solim?
Gram positive bacteria stain what colour?
Purple
Gram negative stain what colour?
Red/pink
8-16hrs after reheated meat, watery diarrhoea lasts 24hrs
Gas gangrene
Clostridium perfringens
Descending paralysis after canned foods/honey
Clostridium botulinum
Treatment of typhoid?
IV ceftriaxone
Treatment for mild malaria?
Mild: artemisin combination therapy (Riamet – artemether + lumefantrine)
What are Negri bodies associated with?
Rabies
Treatment - Rabies IgG post-exposure (passive vaccination)
Cause of Q fever?
Coxiella burnetii, from cattle/sheep
Signs of Q fever?
Atypical pneumonia symptoms: fever, dry cough, pleural effusion
Mixed growth, squamous epithelium - MC&S?
Contaminated sample
Upper UTI management?
Upper: admit, IV co-amox + gent
Chlamydia Serovars L1, L2, L3 cause what?
lympho-granuloma venereum (LGV)
Serovars A, B, C: trachoma can cause what?
Blindness
Treatment for chlamydia infection
Treatment:
Azithromycin 1g stat, or
Doxycycline 100mg BD 7d
Male urethral discharge?
Gonorrhoea
Treatment for gonorrhoea?
Treatment:
Ceftriaxone 250mg IM STAT
Secondary syphilis?
Bacteraemia after 1-6 months fever, lymphadenopathy
Rash on palms and soles
Condyloma acuminate (genital warts)
Signs of tertiary syphilis:
30yrs later 3 different syndromes:
Gummatous: skin/bone/mucosal granulomas
Cardiovascular: mimics any cardiac disease; aortic root dilatation
Neurosyphilis: dementia, tabes dorsalis, Argyll-Robertson pupil
Treatment for syphillis
Treatment: IM benzathine penicillin STAT
TB meningitis findings on LP?
Clear / turbid
Low
High - mononuclear
Bacterial meningitis findings on LP?
Bacterial
Turbid
Low
High - polymorphs
Hospital acquired pneumonia?
S. aureus, Klebsiella, Pseudomonas, Haemophilus
ABx cause of pseudomembranous colitis
3Cs (clindamycin, cephalosporins, ciprofloxacin)