Learning Objectives Flashcards
What is the pathogenesis of T1D AND T2D?
T1D - autoimmune beta islet cell destruction in pancreas, causes insulin deficiency T2D - acquired insulin resistance due to beta cell fatigue, presents later in life due to poor health
How is diabetes control assessed?
Regular FBG HbA1c - glycosylated haemoglobin 3 monthly (should be under 7% < 53)
What lifestyle factors can be used for diabetes management?
Healthy diet (reduced sat fats, low GI CHO) Exercise Smoking cessation RBG monitoring
What are the oral hypoglycaemics available for diabetes treatment?
Metformin (biguanides): First line treatment, inhibits hepatic glucose production and increases insulin sensitivity, does not cause severe hypoglycaemia, contraindications: renal impairment –> perpetuates lactic acidosis, SE: nausea, diarrhoea (avoid this by using slow release drug) Sulphonylureas: Stimulate beta cell insulin release, may cause weight gain, risk of hypoglycaemia (use with care in drivers, pilots etc.) Add if HbA1C is above target on maximum metformin tolerated, Gliclazide is drug of choice Alpha-Glucosidase Inhibitors: Acarbose, blocks starch digesting enzymes, no weight gain or hypoglycaemia, SE: flatulence, must be used with food Thiazolidinedione’s: Reverse insulin resistance, no hypoglycaemia, SE: weight gain, fluid retention, CCF, fractures, bladder cancer DPP4 Inhibitors: Advantage in overweight patients, no hypoglycaemia or weight gain, prolong GLP-1 action, increase insulin secretion, decrease glucagon secretion, inhibits in retina breakdown, SE: nausea, hypersensitivity (rare) GLP-1 Analogues: Advantage in overweight patients, no hypoglycaemia, slow gastric emptying, improve glucose sensing, weight loss, requires injection, SE: nausea, vomiting, pancreatitis SGLT2 Inhibitors: Promote glycosuria to lower blood glucose, mild weight loss, SE: candida infections
What is the investigation for palpitations or syncope?
12 lead ECG Blood glucose U&E
What is the pattern of AF on ECG?
No P waves Irregularly irregular rhythm
What is the pattern of supra ventricular tachycardia on ECG?
Wide QRS complexes, retrograde P waves
What is the pattern of VT on ECG?
Wide QRS (greater than 120msec)
What is the management for AF?
Cardioversion Catheter Ablation (ablate part of heart that is out of rhythm) Beta Blockers Calcium Channel Blockers Digoxin Anti-arhythmics Anticoagulation - warfarin, heparin
What is the score to determine stroke risk in AF patients?
C - chronic heart failure H - hypertension A - age >75 D - diabetes S - stroke V - vascular disease A - age >55 S - sex (female)
What is the management for SVT?
Adenosine (induce AV block to allow SA node to take over rhythm control) IV Verapamil
What is the management for VT?
Cardioversion Amiodarone (if hemodynamically stable)
What is a stroke?
Ischaemic infarct of the brain, lasting over 24 hours, brain damage
What is a TIA?
Brief neurological episode, usually lasting under 24 hours with no permanent brain damage
What is ischaemic penumbra?
Area surrounding the infarcted brain that is also affected by relative ischaemia (but not yet permanently damaged)
What are the types of hemorrhagic stroke?
Deep: hypertensive rupture of deep penetrating arteries, putamen, thalamus, brainstem, cerebellum Lobar: superficial, secondary to amyloid angiopathy, tumour, aneurysm
What are the types of iscahemic stroke?
Large artery thromboembolism (>50% stenosis) Cardiogenic embolism (AF, LV thrombus) Small vessel infarct
What are the major causes of SAH?
Berry aneurysm rupture AVM
How is a stroke diagnosed?
CT (ischaemic vs. haemorrhagic - may not see clot in first few hours but will see haemorrhage)
What is acute stroke management?
Thrombolysis - tPA (ateplase) - under 4.5 hours Anticoagulation Clot Retrieval Mannitol - relieve ICP
What is stroke secondary prevention?
NOAC (dabigatrain, rivaroxaban, apixaban) Warfarin Aspirin Clopidogrel Antihypertensives Statins
What are the common risk factors for stroke?
Age Gender (female) Family History HTN Diabetes Smoking AF Hyperlipidaemia Alcohol TIA/Migraines OCP/HRT OSA Sedentary/obesity
What are the common signs of stroke?
F - facial weakness A - arm weakness S - speech difficulty T - time
What happens if a patient develops a rash 24 hours into penicillin admin?
Change to cephalosporin - ceftriaxone
What is the side effect of ciprofloxacin?
Achilles tendon swelling and tearing
What is the treatment for C.diif?
Metronidazole or vancomycin
What is the treatment for klebsiella UTI and bacteriuria?
Gentamicin
What is the treatment for MRSA?
Vancomycin
What is the likely pathology: Recent haemoptysis, bright red blood mixed with cream coloured sputum, occasional night sweats, 4kg weight loss (1 month)?
TB - mycobacterium tuberculosis
What is the initial management of TB?
Isolation, bronchoscopy and washings, organism culture
What is the epidemiology of IHD?
3% of all Australians, accounts for 17% of all deaths
What are the risk factors for IHD?
Male Increasing Age Family History Hyperlipidaemia Hypertension Diabetes Obesity Smoking Poor diet and exercise CKD
What is the common presentation of IHD?
Chest Pain SOB Nausea Diaphoresis Palpitations Lethargy
What is AMI?
Acute myocardial infarct - diagnosed by at least 2 of: - ST segment changes, Q waves or inverted T waves - CK, troponin rise - MI Symptoms
What is acute coronary syndrome?
Caused by coronary thrombosis in association with ruptured atherosclerotic plaque - leads to narrowing or occlusion of coronary artery
What is the in hospital management of IHD?
PCI - cath lab, under 60 mins Fibrinolysis - early presentation Oxygen Morphine Nitrates Aspirin Heparin/clexane
What are the common complications of AMI and their management?
Angina, reinfarction, infarct extension - Revascularisation Heart failure, cardiogenic shock, mitral valve dysfunction, aneurysm, cardiac rupture - Surgical intervention Arrhythmic: atrial or ventricular, SA/AV node dysfunction - Anti-arrhythmic, pacemaker, implantable defibrillator Embolic: CNS, peripheral - Anticoagulants, antiplatelet (clopidogrel) Inflammatory: pericarditis (sharp inspiration pain) - Anti-inflammatory Pulmonary oedema (treat with diuretic - look for weight change in patient - and oxygen)
What is the post hospital management of AMI?
Medication - Aspirin - Beta Blocker - ACEi - Statin - GTN - Antiplatelet Additional - Antacid - Exercise - Vitamin B1 - Diuretic - Smoking cessation - Healthy diet - Weight loss - Alcohol reduction - Stress reduction - Regular cardiac monitoring
What are the typical insulin regimens for diabetes?
Basal bolus - rapid acting dose with meals (bolus - nova rapid, apidra) and long acting insulin once or twice a day for maintenance (deter, glargine)
What is the venous anatomy of the lower limb?
External iliac - common femoral - deep femoral - femoral - popliteal - anterior tibial and peroneal - posterior tibial - plantar metatarsal Great saphenous and small saphenous and dorsal venous arch
What are primary and secondary varicose veins?
Primary - rope like, present in superficial and perforating veins Secondary - deep vein incompetence due to recanalization of past DVT OR venous obstruction OR genetics
What are the complications of varicose veins?
Pain (relieved by elevation) Swelling (indurated hard) Thrombophlebitits Bleeding Ulcers Varicose Eczema Lipodermatosclerosis (inflammation of subcutansou fat, champagne bottle leg) Atrophie Blanche (white depressed scars)
What is the treatment for varicose veins?
Leg elevation, movement, ulcer care, compression stockings, sclerotherapy (inject into vein to shut it down), open surgery (vein stipping), EVLT (laser therapy), radio frequency ablation
What are the features of arterial ulcers?
Painful Claudication CV risk factors Punched out edges Ulcer base poorly developed, grey Little bleeding Foot cool Nail thickened
What are the features of venous ulcers?
Venous insuffiency - varicose, thrombophlebitis, DVT, surgery Large irregular edge Shallow Common over medial malleolus Moist Stasis dermatitis (darkened surrounding skin)
What are the features of neuropathic ulcers?
Painless Diabetes or peripheral neuropathy Deep Pressure points and calluses Neuropathy signs - loss of sensation Distorted foot architecture (charcouts - fractures leading to loss of foot arches, hyperextended MTP, hyper flexed IP)
What is the management of venous ulceration in the lower limbs?
Bed rest Elevation IV antibiotics Dressings Debridement Split skin graft Revascularisation Compression stockings
What structures can cause chest pain?
Heart (pericardium, myocardium) Pleura Aorta Oesophagus MSK Skin Abdominal Organs
What are the ECG changes in AMI?
ST elevation or depression Q waves Inverted T waves U waves (old infarct)
What is the typical presentation with pleuritic pain?
Worse with inspiration and coughing, sharp stabbing pain
What is the presentation of aortic dissection?
Tearing pain radiating to the back, BP different in each arm
What is the presentation of reflux?
Burning pain in the central chest, usually worse after meals and when lying down
What are the features of a migraine?
- Women - Genetic - Slow spread of reduced activity - Aura, scintillatinf scotoma, monochromatic vision pattern, semi or quadrantonopia - Usually starts in occipital lobe - Buildng pain, pulsating, throbbing, unilateral behind eye - Aggravating - stress, exercise, menstruation, OCP, fatigue - N&V, photophobia, vertigo, irritable, trigeminal pain, allodynia in scalp
What are the features of a tension headache?
Bilateral, band wrapping around head, may also involve neck and shoulders Worse with stress Usually relieved by analgesia
What is a chronic headache?
Present most days of the week for most of those days May be caused by medication overuse (opioids, triptans)
What is evident on a LP looking for SAH?
Xanthochromia - yellow spinal fluid 12+ hours after bleed
What are some possible symptoms of raised ICP?
Pappiloedema 6th nerve palsy Nausea Headache (morning) Better with standing
What are the diagnostic criteria of acute kidney injury?
Increased creatinine 150-200% Reduced urine output < 500mL in > 6 hours
How do you differentiate AKI from CKD?
AKI has acutely elevated serum creatinine and chronic kidney disease has creatinine elevation over time. 24 hour urine study for creatinine would demonstrate level of renal function.
What are the aetiologies of AKI?
Pre-renal: ATN, hypovolemia, haemorrhage, sepsis, hepatorenal syndrome (REDUCED PERFUSION) Intra-renal: ATN, glomerulonephritis, interstitial nephritis, thrombus Post-renal: fibrosis, tumour, stricture, BPH, renal calculi, pyelonephritis (OBSTRUCTION)
What is the treatment for AKI?
Fluid Overload - diuretics (frusemide), renal replacement therapy Avoidance of nephrotoxic agents
What is the pathophysiology of AKI?
Impaired renal perfusion leads to increased sodium and water retention. ATN is most common cause and causes microvascular endothelial injury and tubular ischaemia in proximal tubule. Hypoxaemia causes released of ROS and cell death.
What are the common antibiotic resistant organisms and their treatment?
MRSA - vancomycin VRE - linezolin Clostridium Difficile - metronidazole
What are the presenting features of meningitis and encephalitis?
Fever Neck Stiffness N&V Rash Headache Neurological Symptoms
What are the investigations for CNS infections?
LP (with no increased ICP) CT CRP (often takes 24 hours to raise so normal level may not be true)
What are the CSF findings of meningitis?
Bacterial - cloudy, elevated protein, low glucose, increased pressure Viral - clear, normal/high protein, normal glucose, normal pressure TB - increased pressure, clear, low glucose, high protein Cryptococcal - increased pressure, clear, low glucose, high protein
What are the common organisms that cause meningitis?
Neonates: group b strep, E.coli, listeria Infants & Kids: strep pneumoniae (GPC), Neisseria meningitidis (GNC), H. influenzae B (GNR) Adolescents: Neisseria meningitidis, strep pneumoniae Adults: strep pneumoniae (more likely with no rash and recurrent otitis media), Neisseria meningitidis Older Adults: listeria (GPR)
What is the treatment for meningitis?
Dexamethasone - anti-inflammatory (at the same time or before antibiotics is ideal) Ceftriaxone - strep pneumoniae, Neisseria Benzylpenicillin - listeria Vancomycin - beta lactam resistant strep pneumoniae
What are the common causes of encephalitis?
HSV-1 Listeria
What is the most common cause of spinal abscess and what are the risk factors?
Staph aureus Risk Factors - IVDU - Endocarditis - Sepsis - Bacteraemia - Immunosuppression - DM
What are some common causes of brain abscess?
Sinusitus Lung abscess Strep Staph aureus
What are the signs and symptoms of hyperglycaemia?
Dehydration Coma/LOC Headache Trouble concentrating Blurred vision Fatigue Urinary frequency
What are the signs and symptoms of hypoglycaemia?
Unconscious Confused Palpitations Fatigue Sweating Anxiety Hunger Shaky Pale Tingling Irritability
What are the signs and symptoms of diabetic foot?
Pale Cold Poor capillary refill Pedal pulses not palpable Ulcers Gangrenous
What drug can cause hyperglycaemia?
Corticosteroids
What is the treatment for DKA?
Resuscitation Rehydration - saline then dextrose Correct potassium imbalance Insulin (once potassium level is known)
What is the treatment for hyperglycaemic hyperosmolar state?
Glucose > 25-30 Treat with fluids - 2L hypotonic saline over 1-2 hours, monitor urine, insulin, potassium, low molecular weight heparin
What are some causes of acute agitation?
Infection Dehydration Drugs Trauma Waiting
What are means of sedation?
Benzos - diazepam, midazolam (risk of respiratory depression) - Avoid in dementia due to paradoxical reaction Neuroleptics: olanzapine (increases QT interval, dystonic reaction including laryngospasm) Combination - lower combined doses may decrease agitation occurrence
What is the presentation of AAA?
Collapse Sudden onset back pain Pulsatile mass in lower abdomen Hypovolemia - dehydration, pallor, fatigue, LOC, SOB
What is the investigation for AAA and lower limb ischaemia?
Ultrasound
What is the conservative management for lower limb ischaemia?
Lifestyle modifications - reduce cholesterol, stop smoking, increase exercise, healthy diet, reduce alcohol, control blood pressure and diabetes Surgical - stenting, endarterectomy, bypass
What is the management for AAA?
Aortic surgery - give prophylactic antibiotics for GN organisms
What is hypertension?
BP > 140/90 on 2 or more occasions
What are the secondary causes of HTN?
Renal disease, renal artery stenosis, adrenal tumours (secreting aldosterone, cortisol, catecholamine’s - phaeochromocytoma), sleep apnoea, pregnancy, Cushing’s, hyperaldosteronism
What is absolute cardiovascular risk?
Sex Age SBP Smoking Cholesterol Diabetes ECG LVH
What is the management of HTN?
Lifestyle - lose weight, improve fitness, avoid salt, moderate alcohol, stop smoking Medication - ACEi - < 55, dry cough, renoprotective - ARBs - < 55 - Calcium Channel blockers - > 55, black, avoid non vascular selective (verapamil) in heart failure - Diuretics- thiazide first - Beta blockers - used if ACEi not tolerated, weight gain and insulin resistance, reduced exercise capacity, NOT IN ASTHMA
What are the approaches to resistant HTN?
Most common cause is poor medication compliance Add spironolactone (potassium sparing diuretic), beta blocker, centrally acting agent (methyldopa, clonidine, moxonidine), alpha-blocker, vasodilator