Cardiology Flashcards
Anteroseptal MI ECG leads
V1-4
Anteroseptal MI coronary artery
Left anterior descending
Inferior MI ECG leads
II, III, aVF
Inferior MI coronary artery
Right coronary
Anterolateral MI ECG leads
V1-6, aVL
Anterolateral MI coronary aretery
Proximal left anterior descending
Lateral MI ECG leads
I, aVL, +/- V5-6
Lateral MI coronary artery
Left circumflex
Posterior MI ECG leads
V1-3
Reciprocal changes typically seen
Reciprocal changes in posterior MI
- Horizonal ST depression
- Tall, broad R waves
- Upright T waves
- Dominant R wave in V2
Coronary artery in posterior MI
Usually left circumflex, also right coronary
Use of ACEi
First line hypertension in under 55’s
Heart failure
Diabetic nephropathy
Secondary prevention IHD
SEs ACEi
Cough
Angiodema
Hyperkalaemia
First dose hypotension (more common if on diuretics)
Cautions ACEi
Pregnancy/breastfeeding - avoid
Renovascular disease
Aortic stenosis
Hereditary idiopathic angioedema
K ≥5
Interactions ACEi
High dose diuretics (>80mg furosemide/day) - increased risk of hypotension
Monitoring ACEi
U&E before treatment started and after increaseing dose
Acceptable blood changes when starting ACEi
Serum creatinine 30% inc from baseline
Increase in K up to 5.5mmol/LWh
When might ACEi cause significant renal impairment
In patients with undiagnosed bilateral renal artery stenosis
Secondary prevention after ACS
Aspirin
Second antiplatelet if appropriate, aka clopidogrel
Beta blocker
ACEi
Statin
Common management all patients ACS
Aspirin 300mg
Oxygen to maintain sats <94%
Morphine if severe pain
Nitrates - SL or IV
STEMI criteria
Clinical symptoms of ACS ≥20mins, >20mins ECG features in ≥2 contiguous leads of:
- 2.5mm ST elevation in V2-3 in men under 40 years, or 2mm in men over 40
- 1.5mm ST elevation in V2-3 in women
- 1mm ST elevation in other leads
- New LBBB
Criteria PCI
Presentation in 12 hours of onset of symptoms
PCI can be delivered in 120mins of time fibrinoysis could be given
Criteria fibrinolysis
Presentation within 12 hours of onset of symptoms if primary PCI cannot be delivered within 120mins
Antiplatelets given prior to PCI
If patient not taking oral anticoagulant - prasugrel
If patient taking oral anticoagulant - clopidogrel
Drug therapy used for PCI
If radial access - unfractionated heparin
If femoral access - bivalirudin
Both give glycoprotein IIb/IIIa inhibitor if inadequate response
Other procedures during PCI
Thrombus aspiration
Complete revascularisation if multivessel CAD without cardiogenic shock
Assessment of success of fibrinolysis
ECG repeated 60-90 min after. If persistent myocardial ischaemia, consider PCI
Risk assessment NSTEMI patients
GRACE
What factors included in GRACE score
- Age
- HR and BP
- Cardiac and renal function (creatinine)
- Arrest on presentation
- ECG findings
- Troponin levels
Categories of risk based on predicted 6 month mortality
1.5% or below - lowest
> 1.5 - 3% - low
> 3 - 6% - intermediate
> 6 - 9% - high
over 9% - highesthi
Which patients with NSTEMI/unstable angina should have immediate coronary angiography?
Clinically unstable patients
Which patients with NSTEMI/unstable angina should have coronary angio within 73 hours
GRACE score >3% aka intermediate, high, or highest risk
What antithrombin treatment NSTEMI/unstable angina
Fondaparinux if not high risk of bleeding and not having immediate angio
Unfractionated heparin if immediate angio planned or Cr >265
Drug therapy prior to PCI in patients with NSTEMI/unstable angina
If not taking oral anticoagulant, prasugrel or ticagrelor
If taking oral anticoagulant, clopidogrel
Drug therapy PCI in NSTEMI/unstable angina
Unfractionated heparin
Conservative management NSTEMI/unstable angina
If patient at high risk of bleeding, clopidogrel
If patient not at high risk of bleeding, ticagrelor
Role of adenosine
Terminate SVT
Adverse effects adenosine
Chest pain
Bronchospasm (avoid in asthmatics)
Transient flushing
Can enhance conduction down accessory pathways, resulting in increased ventricular rate e.g. in WPW
What drug enhances effect of adenosine
Dipyridamole
What drug inhibits affects of adenosine
Theophyllines
When to give adrenaline ALS
ASAP non-shockable
Once chest compressions restarted after 3rd shock in VF/VT
Every 3-5 mins whilst ALS continues
Dose adrenaline ALS
1mg
When to give amiodarone ALS
VF/pulseless VT after 3 shocks
Further dose after 5 shocks
Dose amiodarone ALS
After 3 shocks - 300mg
After 5 shocks - 150mg
Alternative to adenosine ALS
Lidocaine
Role of thrombolytic drugs ALS
Should be given if PE suspected
If given, CPR continued for 60-90 minutes
Reversible causes cardiac arrest
Hypoxia
Hypovolaemia
Hyper/hypokalaemia, hypoglycaemia, hypocalcaemia, acidaemia
Hypothermia
Thrombosis (coronary or pulmonary)
Tension pneumothorax
Tamponade
Toxins
Monitoring amiodarone
TFT, LFT, U&E, CXR prior to treatment
TFT and LFT every 6 months
Adverse effects amiodarone
Thyroid dysfunction
Corneal deposits
Pulmonary fibrosis/pneumonitis
Liver fibrosis/hepatitis
Peripheral neuropathy, myopathy
Photosensitivity
‘Slate grey’ appearance
Thrombophlebitis and injection site reactions
Bradycardia
Lengthens QT interval
First line treatment angina
Aspirin and statin
Sublingual GTN as needed
Beta blocker or calcium channel blocker
What calcium channel blocker angina
If monotherapy, rate limiting e.g. verapamil or diltizem
If in combo with beta blocker, dihydropyridine e.g. amlodipine, MR nifedipine
Second line treatment angina
If on beta blocker add CCB and vice versa
Options if patient cannot tolerate addition of beta blocker/CCB in angina
Long acting nitrate
Ivabradine
Nicorandil
Ranolazine
When to add third drug angina
Only whilst awaiting assessment for PCI
How to avoid nitrate tolerance
If taking SR ISMN, asymmetric dosing interval to maintain daily nitrate free time of 10-14 hours
Use of ARBs
Generally when ACEi not tolerated usually due to cough
Examples ARBs
Candesartan
Losartan
Irbesartan
SEs ARBs
Hypotension
Hyperkalaemia
1st line antiplatelet ACS (medially treated)
Aspirin (lifelong) and ticagrelor (12 months)
What if aspirin contraindicated in ACS (medically treated)
Lifelong clopi
1st line antiplatelet after PCI
Asprin (lifelong) and prasurgrel or ticagrelor (12 months)
What if aspirin contraindicated after PCI
Clopidogrel (lifelong)
1st line antiplatelet after TIA
Clopidogrel
2nd line antiplatelet after TIA/stroke
Aspirin and dipyridamole lifelong
1st line antiplatelet peripheral arterial disease
Clopidogrel (lifelong)
2nd line antiplatelet peripheral arterial disease
Aspirin (lifelong)
Risk factors aortic dissection
Hypertension
Trauma
Bicuspid aortic valve
Marfans and Ehlers-Danlos syndrome
Turner’s and Noonan’s sydnrome
Pregnancy
Syphilis
Features aortic dissection
Chest/back pain
Pulse deficit - weak/absent pulse, variation >20mmHg between arms
Aortic regurgitation
Hypertension
Features aortic dissection involving coronary arteries
Angina
Features aortic dissection involving spinal arteries
Paraplegia
Features aortic dissection involving distal aorta
Limb ischaemia
ECG changes aortic dissection
Majority have no or non-specific ECG changes
In minority, ST elevation in inferior leads
Classification aortic dissection
Type A - ascending aorta (more likely chest pain)
Type B - descending aorta (more likely back pain)
CXR aortic dissection
Widened mediastinum
Investigation of choice aortic dissection
CT angio CAP (suitable for stable patients and planning surgery)
CT angio CAP findings aortic dissection
False lumen
Management type A aortic dissection
Surgical management
BP control systolic 100-120mmHg whilst awaiting intervention
Management type B aortic dissection
Conservative management
Bed rest
IV labetalol
Complications backwards aortic dissection
Aortic incompetence/regurgitation
MI - inferior pattern
Complications forward aortic dissection
Stroke
Renal failure
Causes of chronic presentation of aortic regurgitation due to valve disease
Rheumatic fever
Calcific valve disease
Connective tissue disease, e.g. RA, SLE
Bicuspid aortic valve
Causes of acute presentation aortic regurgitation due to valve disease
Infective endocarditis
Causes of chronic presentation aortic regurgitation due to aortic root disease
Bicuspid aortic valve
Spondyloarthropathies, e.g. ankylosing spondylitis
Hypertension
Syphilis
Marfans, Erlers Danlos
Causes of acute presentation of aortic regurgitation due to aortic root disease
Aortic dissection
Features aortic regurgitation
Early diastolic murmur, increased by handgrip
Collapsing pulse
Wide pulse pressure
Quincke’s sign
De Musset’s sign
What is Quincke’s sign
Nailbed pulsation
What is De Musset’s sign
Head bobbing
Aortic regurg surgery indications
Symptomatic with severe AR
Asymptomatic with severe AR and LV dysfunction
Features aortic stenosis
ESM, radiates to carotids, decreased following Valsalva
Narrow pulse prsesure
Slow rising pulse
Delayed ESM
Soft/absent S2
S4
Thrill
Causes aortic stenosis
Degenerative calcification (most common >65)
Bicuspid aortic valve (most common <65)
Williams syndrome
Post-rheumatic disease
HOCM
Management aortic stenosis
If asymptomatic, observe
If symptomatic or valvular gradient >40mmHg and features of LV dysfunction, consider surgeryS
Surgical options aortic stenosis
Surgical AVR for young, low/medium risk patients
Transcatheter AVR for high operative risk
Role of balloon valvuloplasty aortic stenosis
Children with no aortic valve calcification
Adults with critical AS who not fit for valve replacement
Inheritence pattern arrythomogenic right ventricular cardiomyopathy (ARVC)
Autosomal dominant
Pathology ARVC
Right ventricular myocardium replaced with fibrous/fatty tissue
ECG ARVC
Abnormalities in V1-3, typically T wave inversion
Epsilon wave in 50% - terminal notch in QRS complex
Echo ARVC
Often subtle changes in early stages
Enlarged, hypokinetic right ventricle with thin free wall
Management ARVC
Sotalol
Catheter ablation
ICD
What is Naxos disease
Autosomal recessive variant of ARVC
ARVC, palmoplantar keratosis, woolly hair
First line rate control AF
Beta blocker or rate limiting CCB (e.g. diltiazem)
Second line rate control AF
Combination therapy with any 2 of:
Beta blocker
Diltiazem
Digoxin
CHADVASC score
Congestive HF - 1
Hypertension - 1
Age ≥75 - 2
Age 65-74 - 1
Diabete - 1
Prior stroke, TIA, or thromboembolism - 2
Vascular disease - 1
Female - 1
Anticoagulation based on CHADVASC
0 - no treatment
1 - consider anticoagulation if male
2 - offer anticoagulation
HASBLED score
Hb <130 males, <120 for females - 2
Age >74 - 1
Bleeding history (GI, intracranial) - 2
GFR <60 - 1
Antiplatelets - 1
Interpretation HASBLED
0-2 low risk
3 medium risk
4-7 high risk
First line anticoagulant AF
DOACs
Indications for cardioversion AF
If haemodynamically unstable (emergency)
If rhythm control strategy preferred (elective)
Anticoagulation prior to cardioversion
If definitely less than 48 hours, patients should be heparinised
If more than 48 hours, needs anticoagulation for at least 3 weeks prior to cardioversion (or TOE to exclude left atrial appendage thrombus - if neg, treat as less than 48h)
Cardioversion options when onset AF <48 hours
Electrical cardioversion
Chemical cardioversion
Drugs used for chemical cardioversion
Amiodarone if structural heart disease
Flecainide or amiodarone if no structural heart disease
Cardioversion options AF onset >48 hours
Electrical cardioversion
Management of AF with high risk of cardioversion failure
At least 4 weeks of amiodarone or sotalol prior to electrical cardioversion
Management post electrical cardioversion
If AF was <48 hours duration, no anticoagulation necessary
If AF >48 hours, at least 4 weeks of anticoagulation
Anticoagulation in AF post stroke
Warfarin or direct thrombin (rivaroxaban, apixaban, edoxaban) or factor Xa inhibitor (dabigatran)
When should anticoagulation for AF be started in TIA patients
Immediately (once haemorrhage excluded)
When should anticoagulation for AF be started in acute stroke patients
After 2 weeks (antiplatelets in intervening period)
Delayed if imaging shows very large cerebral infarction
When should rhythm control strategy be employed in AF
AF has reversible cause
Heart failure thought to be primarily caused by AF
New onset AF (<48hours)
Flutter suitable for ablation
More suitable based on clinical judgement
Role of digoxin rate control for AF
Not first line as less effective at controlling heart rate during exercise, only considered if person does no or very little exercise and other rate-limiting drugs ruled out due to co-morbidities
Good if co-existent heart failure
What drugs can be used to maintain sinus rhythm in patients with history of AF
Beta blockers
Dronedarone
Amiodarone
When is catheter ablation used in AF
If have not responded to or wish to avoid anti-arrhythmic medication
Anticoagulation around catheter ablation for AF
4 weeks before and during procedure
Limitation of catheter ablation for AF
Does not reduce stroke risk, even if patients remain in sinus rhythm, so still need anticoagulation based on chadvasc
Complications catheter ablation AF
Cardiac tamponade
Stroke
Pulmonary vein stenosis
Features first degre heart block
PR interval >0.2s
Often asymptomatic - if so doesnt need treatment
Features second degree heart block type 1
Progressive prolongation of PR interval until dropped beat occurs
Features second degree heart block type 2
PR interval constant, but P wave often not followed by QRS
Features third degree heart block
No association between P waves and QRS complexes
Causes raised BNP
Heart failure
Left ventricular hypertrophy
Ischaemia
Tachycardia
RV overload
Hypoxaemia
GFR <60
Sepsis
COPD
Diabetes
Age >70
Cirrhosis
Factors reducing BNP (false lows)
Obesity
Diuretics
Drugs
Drugs reducing BNP
ACEi
Beta blockers
ARBs
Aldosterone antagonists
What is bivalirudin
Reversible direct thrombin inhibitor used as anticoagulant in management of ACS
Inheritance Brugada syndrome
Autosomal dominant
ECG changes Brugada syndrome
Convex ST segment elevation >2mm in >1 of V1-3, followed by negative T wave
Partial RBBB
Investigation of choice Brugada syndrome
Give flecainide or ajmaline - ECG changes become more pronounced
Management Brugada syndrome
ICD
What is Buerger’s disease
Small and medium vessel vasculitis, strongly associated with smoking
Features Buerger’s disease
Extremity ischaemia - intermittent claudication, ischaemic ulcers
Superficial thrombophlebitis
Raynaud’s phenomenon
Features cardiac tamponade
Hypotension
Raised JVP
Muffled heart sounds
Dyspnoea
Tachycardia
Pulses paradoxus
Absent Y descent on JVP
ECG cardiac tamponade
Electrical alternans
Causes restrictive cardiomyopathy
Amyloidosis
Post-radiotherapy
Loeffler’s endocarditis
When does peripartum cardiomyopathy occur
Last month of preg - 5 months PP
Risk factors peripartum cardiomyopathy
Older women
Greater parity
Multiple gestations
Features Takotsubo cardiomyopathy
Stress induced
Transient, apical ballooning of myocardium
Supportive treatment
Infective causes of cardiomyopathy
Coxsackie B
Chagas disease
Infiltrative causes of cardiomyopathy
Amyloidosis
Storage causes of cardiomyopathy
Haemochromotosis
Toxic causes of cardiomyopathy
Doxorubicin
Alcoholic
Inflammatory causes of cardiomyopathy
Sarcoidosis
Endocrine causes of cardiomyopathy
Diabetes mellitus
Thyrotoxicosis
Acromegaly
Neuromuscular causes of cardiomyopathy
Friedreich’s ataxia
Duchenne/Beckers muscular dystrophy
Myotonic dystrophy
Nutritional causes of cardiomyopathy
Beriberi (thiamine)
Autoimmune causes of cardiomyopathy
SLE
What is Boerhaaves syndrome
Spontaneous rupture of oesophagus occurring as result of repeated episodes of vomiting
Presentation Boerhaaves syndrome
Sudden onset severe chest pain with severe vomiting
Severe sepsis secondary to mediastinitis
Diagnosis Boerhaaves syndrome
CT contrast swallow
Treatment Boerhaaves syndrome
Thoracotomy and lavage
If less than 12 hours from onset, primary repair feasible. If more, insertion of T tube to create controlled fistula between oesophagus and skin
First line investigation suspected heart failure
BNP
Interpretation BNP as first line in suspected heart failure
If >400, specialist assessment inc transthoracic echo within 2 weeks
If 100-400, specialist assessment including transthoracic echo within 6 weeks
BNP → NTproBNP conversion
BNP >400 = NTproBNP >2000
BNP 100-400 = NTproBNP 400-2000
First line treatment heart failure
ACEi and beta blocker
Start one at a time, judgement to decide which
Second line treatment heart failure
Aldosterone antagonist, e.g. spironolactone and eplerenone
Role of SGLT-2 inhibitors in heart failure
Reduce hospitalisation and cardiovascular death
Add dapagliflozin to optimised standard care
Third line treatment heart failure
Should be initiated by specialist
Options:
- Ivabradine
- Sacubitril-valsartan
- Hydralazine with nitrate
- Digoxin
- Cardiac resync therapy
Criteria ivabradine heart failure
Sinus rhythm >75/min
LV fraction <35%
Criteria sacubitril-valsartan heart failure
LV fraction <35
Symptomatic on ACEi/ARB
Initiated following ACEi/ARB wash out period
Use of digoxin in heart failure
- Improves symptoms due to inotropic properties
- Strongly indicated if co-existent AF
Who is hydralazine with nitrate useful for in heart failure
Afro-Caribbean patients
Indications cardiac resync therapy in heart failure
Widened QRS (LBBB)
Vaccinations in heart failure
Annual flu
One of pneumococcal
Who needs 5 yearly pneumococcal vaccine
Asplenia or splenic dysfunction
CKD
NYHA class I heart failure
No symptoms, no limitation on ordinary physicla exercise
NYHA class II heart failure
Mild symptoms, slight limitations of physical activity, comfortable at rest but ordinary activity results in fatigue, palpitations, or dyspnoea
NYHA class III heart failure
Moderate symptoms
Marked limitation of physical activity, comfortable at rest but less than ordinary activity results in symptoms
NYHA class IV heart failure
Severe symptoms, unable to carry out any physical activity without discomfort, symptoms present at rest
Associations coarctation of aorta
Turner’s syndrome
Bicuspid aortic valve
Berry aneurysms
Neurofibromatosis
Features coarctation of aorta
In infancy, heart failure
In adults, hypertension
Radiofemoral delay
Mid-systolic murmur, maximal over back
Apical blick from aortic valve
Notching of inferior border of ribs (due to collateral vessels)