Cardiology Flashcards
At what BP value does hypertension become symptomatic?
> 200/120mmHg
What is stage 1 hypertension?
- clinial BP >=140/90
- ABPM/HPBM >=135/85
What is stage 2 hypertension?
- clinial BP >=160/100
- ABPM/HPBM >=150/95
What is severe hypertension?
systolic >=180
diastolic >=120
Drug causes of HTN
- leflunomide
- MAOI
- corticosteroids
- NSAIDs
- pregnancy
- coarctation of aorta
- COCP
What do you do if someone has a BP >=180/120mmHg?
- specialist assessment if retinal haemorrhage or papilloedema, life threatening symptoms or suspected phaeochromocytoma
- urgent investigation for end organ damage
How would you treat someone with a BP of >=140/90?
- repeat reading
- offer ABPM/HBPM
- if >=135/85, treat if >80yo and one of factors
- factors: target organ damage, CVD, renal disease, diabetes, CV risk >=10%
- if>=150/95, treat regardless of age
What are the blood pressure targets?
- <80yo: 140/90mmHg clinical, 135/85mmHg
- >80yo: 150/90mmHg clinical, 145/85mmHg
ACEi ADR
- hyperkalaemia
- cough
- angioedema
Calcium channel blockers ADR
- flushing
- ankle swelling
- headache
Thiazide type diuretics ADR
- hyponatraemia
- hypokalaemia
- dehydration
A2RB ADR
hyperkalaemia
Causes of ejection systolic murmur:
- aortic stenosis
- aortic sclerosis
- pulmonary stenosis
- tetralogy of fallot
- HOCM
- atrial septal defect
Causes of pan systolic murmur:
- mitral/tricuspid regurgitation
- ventricular septal defect
Causes of late systolic murmur:
- mitral valve prolapse
- coarctation aorta
Causes of early diastolic murmur:
- aortic regurgitation
- graham steel murmur (pulmonary regurgitation)
Causes of mid-late diastolic murmur:
- mitral stenosis
- Austin-Flint (severe aortic regurgitation)
Clinical signs of aortic stenosis:
- murmur radiates to carotids, decreases with valsalva
- narrow rising pulse
- narrow pulse pressure
- delayed ESM
- soft/absent S2
- S4
- thrill
- left ventricular hypertrophy (makes murmur quieter)
Clinical signs of aortic regurgitation:
- murmur intensity increased with handgrip manoeuvre
- collapsing pulse
- wide pulse pressure
- Quincke’s sign
- DeMusset’s sign
Clinical signs of mitral stenosis:
- mid-late diastolic murmur (best hear in expiration)
- loud S1 opening snap
- low volume pulse
- malar flush
- atrial fibrillation
Most common cause of mitral stenosis?
rheumatic fever
Most common cause of aortic stenosis?
> 65yo - calcification
<65yo - bicuspid aortic valve
Clinical signs of mitral regurgitation:
- murmur at apex and radiating to axilla
- S1 may be quiet incomplete closure
- severe may cause widely split S2/3
Clinical signs of patent ductus arteriosus:
- left subclavicular thrill
- continuous machinery murmur
- large volume
- bounding
- collapsing pulse
- wide pulse pressures
- heaving apex beat
- reverse split S2
How do you treat patent ductus arteriosus?
indomethacin or ibuprofen
What is tetralogy of fallot?
- ventricular septal defect
- right ventricular hypertrophy
- right ventricular outflow obstruction, pulmonary stenosis
- overriding aorta
Clinical signs of tetralogy of fallot:
- cyanosis
- right to left shunt
- ejection systolic murmur due to pulmonary stenosis
- right sided aortic arch
- boot shaped heart
What bacteria most commonly causes rheumatic fever?
strep pyogenes
What type of reaction is rheumatic fever?
type II hypersensitivity
What are the major criteria of rheumatic fever?
- erythema marginatum
- sydenham’s chorea
- polyarthritis
- carditis and valvulitis
- subcutaneous nodules
What are the minor criteria of rheumatic fever?
- increased ESR or CRP
- pyrexia
- arthralgia
- prolonged PR interval
Factors favouring rate control in AF
- over 65yo
- Hx of ischaemic heart disease
Factors favouring rhythm control in AF
- younger than 65yo
- symptomatic
- first presentation
- lone AF or secondary to corrected precipitant (e.g. alcohol)
- congestive heart failure
Explain the ALS procedure for someone in VT/VF arrest:
- 3 shocks with each shock followed by 2 min CPR
- adrenaline 1mg after 3 shocks, then every 3-5 minutes
What is the ALS procedure when a cardiac arrest is witnessed in a monitored patient?
up to 3 quick successive shocks without CPR in between
Explain the ALS procedure in systole or pulseless EA:
- adrenaline 1mg ASAP
- 2 min CPR before reassessment
What are the ECG signs of digoxin toxicity?
- ST depression - reverse tick
- flattened/inverted T waves
- short QT
- arrhythmias e.g. AV block, bradycardia
What are the ECG signs of hypokalaemia?
- U waves
- small/absent T waves
- long PR
- ST depression
- long QT
What are the ECG signs of hyperkalaemia?
- peaked/tall tented T waves
- loss of P waves
- broad QRS
- sinusodial wave pattern
- VF
What are the ECG signs of hypothermia?
- bradycardia
- J waves
- 1st degree HB
- long QT
- ventricular and atrial arrhythmias
What are the coronary territories?
anteroseptal: V1-V4 (LAD)
inferior: II, III, aVF (right coronary)
anterolateral: V4-V6, I, aVL (LAD or left circumflex)
lateral: I, aVL, V5-V6 (left circumflex)
posterior: tall R waves V1-V2 (usually left circumflex or right coronary)
ECG signs of myocardial ischaemia:
acute: -hyperacute T waves for few minutes -STE -T waves inverted within 24hrs -pathological W waves posterior MI: ST depression
Management of acute heart failure:
- O2
- IV loop diuretics
- opiates
- vasodilators
- inotropic agents
- CPAP
- ultrafiltration
- mechanical circulatory assistance e.g. intra-aortic balloon counter pulsation or ventricular assist devices
- discontinue beta blockers short term
CXR signs of heart failure
Alveolar oedema kerley B line Cardiomegaly Dilated prominent upper lobe vessels Effusion
Potassium sparing diuretics (types, MOA, indications)
- epithelial sodium channel blockers (amiloride and triamterene)
- amiloride works in distal convoluted tubule
- aldosterone antagonists (spironolactone and eplerenone)
- work in cortical collection duct
- used for HF, ascites (cirrhosis causing secondary hyperaldosteronism), nephrotic syndrome, Conn’s syndrome
Loop diuretics (examples, ADR)
- furosemide, bumetanide
- hypokalaemia, hypotension, hyponatraemia, hypomagnesaemia, hypocalcaemia
- hypochloraemic alkalosis
- gout
- ototoxicity
- real impairment
- hyperglycaemia
Thiazide diuretics (ADR)
- postural hypotension
- dehydration
- hyponatraemia, hypokalaemia, hypercalcaemia
- gout
- impaired glucose tolerance
- impotence
- rare: agranulocytosis, thrombocytopenia, pancreatitis, photosensitivity rash
Nitrates (ADR)
- hypotension
- tachycardia
- headache
- flushing
How can you avoid nitrate tolerance?
- second dose isosorbide mononitrate after 8 hours
- or use modified release isosorbide mononitrate
Use of nicotinic acid and ADR
- treatment for hyperlipidaemia - reduced cholesterol and triglycerides and increases HDL
- ADR: flushing (prostaglandins), impaired glucose tolerance, myositis
Use of nicorandil and ADR
- vasodilatory drug for angina
- ADR: flushing, headache, anal ulceration
- CONTRA: left ventricular failure
Use of ivabradine and ADR
- anti-anginal
- works on If funny current to decrease pacemaker activity in SAN
- ADR: headache, bradycardia, heart block, visual effects (luminous phenomena)
Dabigatran (MOA, indications, ADR)
- direct thrombin inhibitor
- for venous thromboembolism prophylaxis after hip or knee replacement
- non-valvular AF with one of (see notes)
- ADR: haemorrhage (reverse with idracizumab), reduce dose if CKD and not if creatinine clearance <30ml/min
What is bivalirudin?
- direct thrombin inhibitor
- anticoag in ACS
Beta blockers (ADR, CONTRA)
- ADR: bronchospasm, cold disease, fatigue, sleep disturbances, erectile dysfunction
- CONTRA: asthma, uncontrolled HF, sick sinus syndrome, concurrent verapamil use
Amiodarone (MOA, monitoring, ADR)
- class III anti-arrhythmic administered in central vein (risk of thrombophlebitis)
- check LFTs, TFTs, U&Es and CXR before Tx
- check TFT and LFTs every 6 months
- ADR: thyroid dysfunction, pulmonary fibrosis/pneumonitis, liver fibrosis/hepatitis, slate grey appearance, corneal deposits, peripheral neuropathy, photosensitivity, thrombophlebitis and injection site reactions, bradycardia, lengthens QT interval
Adenosine (MOA, ADR)
- to terminate SVT
- enhanced by dipyridamole and blocked by theophylline
- avoid in asthmatics (bronchospasm)
- agonist of A1 receptor in AV node
- half life: 8-10 seconds (use large calibre cannula)
- ADR: chest pain, bronchospasm, transient flushing, enhances conduction down accessory pathways
Caution and CONTRA of ACEi
- avoid in pregnancy and breastfeeding
- renovascular disease
- aortic stenosis - hypotension
- hereditary idiopathic angioedema
- specialist advice if K+ >=5mmol/L
Statins ADR and CONTRA
- myopathy: myalgia, myositis, rhabdomyolysis and asymptomatic rise in creatinine kinase (more common lipophilic statins)
- liver impairment: check LFTs at baseline, 3mo and 12mo, discontinue if AST conc 3x reference range
- CONTRA: macrolides, pregnancy
Examples of glycoproteins IIb/IIIa receptor antagonists
- abciximab
- eptifibatide
- tirofiban
Warfarin in emergency surgery:
If surgery can wait for 6-8 hours - give 5 mg vitamin K IV
If surgery can’t wait - 25-50 units/kg four-factor prothrombin complex
Investigation for cardiac tamponade:
echocardiogram
What is PERC criteria used for?
ruling out PE for patients with low (<15%) pre-test possibility