Cardiovascular Flashcards
When would you use rhythm control in the management of AF?
If there is coexistent heart failure, first onset AF or an obvious reversible cause
What is the diagnosis?
Aortic dissection (type A) - an intraluminal tear has formed a ‘flap’ that can be clearly seen in the ascending aorta
How do thiazide diuretics cause hypokalaemia?
Thiazide diuretics work by inhibiting sodium reabsorption at the beginning of the distal convoluted tubule (DCT) by blocking the thiazide-sensitive Na+-Cl symporter
Delivery of sodium to the distal part of the distal convoluted tubule is increased → increased sodium reabsorption in exchange for potassium and hydrogen ions
What ECG changes are seen in hypokalaemia?
- Prominent U waves
- Small or absent T waves (occasionally inversion)
- Prolonged PR
- ST depression
- Long QT
How does Conn’s syndrome/bilateral adrenal hyperplasia cause hypokalaemia?
Due to increased levels of aldosterone, there is more sodium reabsorption in the kidneys and an increase in the excretion of potassium (hence hypokalemia)
This also leads to volume expansion, and increased blood pressure
Describe the initial drug management for all patients with ACS
- Aspirin 300mg
- Oxygen if sats < 94%
- Morphine only if patient in severe pain
- Nitrates (caution if hypotensive)
How would you manage an NSTEMI patient who is clinically unstable (e.g. hypotensive)?
- Unfractionated heparin
- Immediate coronary angiography with follow-on PCI if necessary
What drug would you give to an NSTEMI patient who is not at a high risk of bleeding and who is not having angiography immediately?
Fondaparinux
How would you manage an NSTEMI patient with a GRACE score > 3%?
Coronary angiography with follow-on PCI if necessary within 72 hours
How would you convervatively manage a patient with an NSTEMI/unstable angina?
Further antiplatelet (‘dual antiplatelet therapy’, i.e. aspirin + another drug)
- If the patient is not at a high risk of bleeding: ticagrelor
- If the patient is at a high risk of bleeding: clopidogrel
What diagnosis does the ECG suggest?
MI - massive ST elevation with associated hyperacute T waves in the anterior leads suggestive of an ongoing myocardial infarction
How long should a patient with an ‘unprovoked’ DVT be on anticoagulation?
6 months
What CHA2DS2-VASC score indicates a need for anticoagulation?
Men: CHA2DS2-VASc >= 1
Women CHA2DS2-VASc >= 2
What are the components of the CHA2DS2-VASc score?
What is the surgical invention of choice for mitral stenosis?
Percutaneous mitral commissurotomy
What clinical findings are associated with mitral stenosis?
- Rumbling mid-late diastolic murmur, best heard in expiration
- Loud S1
- Opening snap after S2
- Low volume pulse
- Malar flush
How does mitral stenosis present?
- Hx of rheumatic fever
- Dyspnoea
- Orthopnoea
- Haemoptysis
- AF
A 58-year-old female on the respiratory ward was admitted with a pulmonary embolism one week ago and was started on warfarin at the time of diagnosis. She was covered with low molecular weight heparin until the INR was > 2 for 24 hours. For the past week she has been taking 4mg of warfarin and her INR four days ago was 2.2. Her INR has been checked today and is 1.3.
What is the most appropriate action to take?
Increase dose of warfarin to 6mg and start LMWH
As her INR is < 2 she needs immediate anti-coagulation with rapid acting low molecular weight heparin. Her warfarin dose should also be increased to 6mg. Her INR should be carefully monitored and the LMWH discontinued when has adequate anti-coagulation.
A 76-year-old man is seen by his GP. He recently had an ambulatory blood pressure monitor which showed frequent readings above 160/95 mmHg. The man has a background of well controlled heart failure (New York Heart Association stage 2) and chronic kidney disease. He takes ramipril, bisoprolol and atorvastatin; he has been established on this regime for one year and doses have been optimised.
What would be the most appropriate next step?
Add a calcium channel blocker (e.g. amlodipine) or a thiazide-like diuretic e.g. indapamide)
What is the first line investigation for PE?
CTPA
When would you DC cardiovert a patient wtih a tachyarrhythmia?
Systolic BP < 90 mmHg
What is the most likely diagnosis?
PE - shows a large saddle embolus
What is the investigation of choice in a patient with suspected PE who has renal impairment?
V/Q scan
How many sets of blood cultures are required to make a diagnosis of infective endocarditis?
3
What non-cardiac conditions may cause a rise in troponin?
A troponin rise may occur in conditions where there is myocardial ischaemia from a supply-demand-mismatch secondary to another primary condition (e.g. sepsis)
What does the ECG show?
Trifascicular block
RBBB +left anterior or posterior hemiblock + 1st-degree heart block = trifasicular block
Why should amiodarone be given into central veins?
Common cause of thrombophlebitis - reduces the risk of injection site reactions
What drug would you give in the following scenario: poorly controlled hypertension, already taking an ACE inhibitor, calcium channel blocker and a thiazide diuretic. K+ < 4.5mmol/l
Spironolactone
What effect will a P450 inducer have on INR in a patient taking warfarin?
INR will decrease
What are the main examples of P450 inducers?
- Antiepileptics: phenytoin, carbamazepine
- Barbiturates: phenobarbitone
- Rifampicin
- St John’s Wort
- Chronic alcohol intake
- Griseofulvin
- Smoking (affects CYP1A2, reason why smokers require more aminophylline)
What effect will a P450 inhibitor have on INR in a patient taking warfarin?
INR will increase
What are the main examples of P450 inhibitors?
- Antibiotics: ciprofloxacin, clarithromycine/erythromycin
- Isoniazid
- Cimetidine, omeprazole
- Amiodarone
- Allopurinol
- Imidazoles: ketoconazole, fluconazole
- SSRIs: fluoxetine, sertraline
- Ritonavir
- Sodium valproate
- Acute alcohol intake
- Quinupristin
What clinical signs are associated with tricuspid regurgitation?
- Pan-systolic murmur
- Prominent/giant V waves in JVP
- Pulsatile hepatomegaly
- Left parasternal heave
What is the most common cause of tricuspid regurgitation?
Secondary to pulmonsy hypertension as a result of chronic lung disease such as COPD
What are the common side effects of beta blockers?
- Bronchospasm
- Cold peripheries
- Fatigue
- Sleep disturbances, including nightmares
- Erectile dysfunction
Describe the features of NYHA class I heart failure
- No symptoms
- No limitation: ordinary physical exercise does not cause undue fatigue, dyspnoea or palpitations
Describe the features of NYHA class II heart failure
- Mild symptoms
- Slight limitation of physical activity: comfortable at rest but ordinary activity results in fatigue, palpitations or dyspnoea
Describe the features of NYHA class III heart failure
- Moderate symptoms
Marked limitation of physical activity: comfortable at rest but less than ordinary activity results in symptoms
Describe the features of NYHA class IV heart failure
Severe symptoms
Unable to carry out any physical activity without discomfort: symptoms of heart failure are present even at rest with increased discomfort with any physical activity
Why should verapamil and beta-blockers should never be taken concurrently?
Possibility of heart block and fatal arrest
How would you manage a patient with stable CVD and AF?
Stop antiplatelet and switch to oral anticoagulant monotherapy
What murmur is associated with pulmonary stenosis?
Ejection systolic murmur typically heard best in the second left intercostal space and may radiate towards the left shoulder
Louder on inspiration
What clinical findings are associated with aortic regurgitation?
- Early diastolic murmur
- Collapsing pulse
- Wide pulse pressure
- Quincke’s sign (nailbed pulsation)
- De Musset’s sign (head bobbing)
A 25-year-old female is found to have a left hemiparesis following a deep vein thrombosis. An ECG shows RBBB with right axis deviation. What is the most likely underlying diagnosis?
Ostium secundum atrial septal defect
What cardiomyopathy is associated with Wolff-Parkinson White?
HOCM
A cardiologist has asked you to start oral amiodarone for a patient who has previously been admitted with ventricular tachycardia. What tests is it important to ensure the patient has had prior to starting treatment?
TFT + LFT + U&E + CXR
A baseline chest x-ray is required due to the risk of pulmonary fibrosis / pneumonitis in patients treated with amiodarone. Urea and electrolytes are suggested by the BNF to detect hypokalaemia which may increase the risk of arrhythmias developing.
What is the most specific ECG finding in acute pericarditis?
PR depression
What drug is the first line treatment in a non-diabetic patient of black African or African-Caribbean origin with hypertension?
Calcium channel blocker e.g. nifedipine
What is the most common cause of death following an MI?
VF
What is Dressler’s syndrome
- Tends to occur around 2-6 weeks following a MI
- The underlying pathophysiology is thought to be an autoimmune reaction against antigenic proteins formed as the myocardium recovers
- It is characterised by a combination of fever, pleuritic pain, pericardial effusion and a raised ESR
- It is treated with NSAIDs
What is a left ventricular aneurysm?
- Following an MI, tschaemic damage sustained may weaken the myocardium resulting in aneurysm formation
- This is typically associated with persistent ST elevation and left ventricular failure (in exam q - persistent ST elevation following recent MI, no chest pain)
- Thrombus may form within the aneurysm increasing the risk of stroke; patients are therefore anticoagulated
What is left ventricular free wall rupture?
- Complication seen in around 3% of MIs and occurs around 1-2 weeks afterwards
- Patients present with acute heart failure secondary to cardiac tamponade (raised JVP, pulsus paradoxus, diminished heart sounds)
- Urgent pericardiocentesis and thoracotomy are required
How might an MI cause acute mitral regurgitation? How would you treat it?
More common with infero-posterior infarction and may be due to ischaemia or rupture of the papillary muscle
Acute hypotension and pulmonary oedema may occur
An early-to-mid systolic murmur is typically heard
Patients are treated with vasodilator therapy but often require emergency surgical repair
A 61-year-old man with peripheral arterial disease is prescribed simvastatin. What is the most appropriate blood test monitoring?
- LFTs at baseline, 3 months and 12 months
- A fasting lipid profile may also be checked during monitoring to assess response to treatment
What is a bisferiens pulse?
- Seen in mixed aortic valve disease
- A bisferiens pulse is a specific type of arterial pulse waveform observed during palpation of the pulse at various pulse points in the body, typically the radial artery
- This pulse is characterized by having two distinct systolic peaks separated by a mid-systolic dip
- Caused by the complex interactions between the regurgitant and stenotic flows
What adverse effects are associated with loop diuretics?
- Hypotension
- Hyponatraemia
- Hypokalaemia, hypomagnesaemia
- Hypochloraemic alkalosis
- Ototoxicity
- Hypocalcaemia
- Renal impairment (from dehydration + direct toxic effect)
- Hyperglycaemia (less common than with thiazides)
- Gout
When is nicorandil indicated in angina?
Second-line drug treatment for angina pectoris if first-line drugs (beta-blockers or calcium channel blockers) are contraindicated or not tolerated
What are the adverse effects of nicorandil?
- Headache
- Flushing
- Skin, mucosal and eye ulceration - GI ulcers including anal ulceration
What is the definition of stage 1 hypertension in clinic?
140/90 mmHg
What are the risk factors for asystole in bradycardia (? needs transvenous pacing)?
- Complete heart block with broad complex QRS
- Recent asystole
- Mobitz type II AV block
- Ventricular pause > 3 seconds
For a patient with symptomatic stable angina on a calcium channel blocker but with a contraindication to a beta-blocker, what is the next line treatment?
Long-acting nitrate, ivabradine, nicorandil or ranolazine
Management of high INR: major bleeding (e.g. variceal haemorrhage, intracranial haemorrhage)
- Stop warfarin
- Give intravenous vitamin K 5mg
- Prothrombin complex concentrate - if not available then FFP
Management of high INR: INR > 8.0 with minor bleeding
- Stop warfarin
- Give intravenous vitamin K 1-3mg
- Repeat dose of vitamin K if INR still too high after 24 hours
- Restart warfarin when INR < 5.0
Management of high INR: INR > 8.0 no bleeding
- Stop warfarin
- Give vitamin K 1-5mg by mouth, using the intravenous preparation orally
- Repeat dose of vitamin K if INR still too high after 24 hours
- Restart when INR < 5.0
Management of high INR: INR 5.0-8.0 with minor bleeding
- Stop warfarin
- Give intravenous vitamin K 1-3mg
- Restart when INR < 5.0
Management of high INR: INR 5.0-8.0 with no bleeding
- Withhold 1 or 2 doses of warfarin
- Reduce subsequent maintenance dose
What is the shown on the ECG?
Atrial flutter with variable block
Whilst ‘sawtooth’ waves are seen the rhythm is irregular suggesting a diagnosis of atrial flutter with variable block
What is Eisenmenger’s syndrome?
- Describes the reversal of a left-to-right shunt in a congenital heart defect due to pulmonary hypertension
- This occurs when an uncorrected left-to-right leads to remodeling of the pulmonary microvasculature, eventually causing obstruction to pulmonary blood and pulmonary hypertension
What ECG findings are associated with Eisenmenger’s syndrome?
Right ventricular hypertrophy
What is pulsus paradoxus?
Clincial sign associated with cardiac tamponade
Abnormally large drop in BP during inspiration
What type of heart failure is associated with HCOM?
Diastolic dysfunction (heart failure with preserved ejection fraction)
What is the inheritance pattern of HOCM?
Autosomal dominant
What murmur is associated with atrial septal defect?
Ejection systolic murmur louder on inspiration
How long can a patient not drive for following MI?
4 weeks
In which bronchus are inhaled foreign objects most likely to be found?
Right main bronchus
What is the blood pressure target for a patient < 80 years with hypertension?
140/90 mmHg
What ECG changes are associated with a posterior MI?
- Horizontal ST depression
- Tall, broad R waves
- Upright T waves
- Dominant R wave in V2
What cardiomyopathy are alcoholics at risk of?
Dilated cardiomyopathy
What echocardiogram findings are associated with dilated cardiomyopathy?
Left ventricular ejection fraction < 55%, dilated left ventricle, no motion wall abnormalities
What electolyte disturbance can lead to long QT?
Hypokalaemia
What is long QT?
- Occurs when the QT interval is >450ms
- This can predispose an individual to developing Torsade de Pointes
How do you manage a patient with aortic stenosis?
AVR if symptomatic, otherwise cut-off is gradient of 40 mmHg
How long are ‘provoked’ PEs treated for?
3 months
When is new onset AF considered for electrical cardioversion?
If it presents within 48 hours of onset
What is the most common cause of aortic stenosis in younger patients (<65 years)?
Bicuspid aortic valve
What is the most common cause of aortic stenosis in older patients (> 65 years)?
Calcification of the aortic valve
What is the next line therapy for a hypertensive patient < 55 years old who is on an ACE-i and is intolerant to calcium channel blockers?
Thiazide-like diuretics
What is the best site for insertion for primary PCI?
Radial artery
If a patient goes into witnessed cardiac arrest with a shockable rhythm while on a monitor, how does this change your ALS management?
Give up to three successive shocks before CPR
Describe anticoagulation when considering cardioversion for AF
If a patient has been in AF for more than 48 hours then anticoagulation should be given for at least 3 weeks prior to cardioversion
An alternative strategy is to perform a transoesophageal echo (TOE) to exclude a left atrial appendage (LAA) thrombus
How should adenosine be given in SVT?
As a rapid IV bolus
What are the doses of atorvostatin for primary and secondary prevention of CVD?
Atorvastatin 20mg for primary prevention, 80mg for secondary prevention
What is the main ECG abnormality seen with hypercalcaemia?
Shortening of the QT interval
When should beta blockers be stopped in acute heart failure?
If the patient has heart rate < 50/min, second or third degree AV block, or shock
What drug should be considered as second-line therapy in patients with HFrEF in addition to optimised standard care?
SGLT-2 inhibitors
What drug is used to anticoagulate patients with mechanical heart valves?
Warfarin
If fibrinolysis is given for an ACS, when should an ECG be repeated?
After 60-90 minutes
What is the recommended dose of adrenaline to give during advanced ALS?
1mg
What is the first line treatment for a hypertensive diabetic?
ACE inhibitors/A2RBs are first-line regardless of age
What are the clinical signs of right-sided heart failure?
Signs of right-sided heart failure are raised JVP, ankle oedema and hepatomegaly
A 64-year-old man with a history of ischaemic heart disease and poor left ventricular function presents with a broad complex tachycardia of 140 bpm. On examination blood pressure is 110/74 mmHg. Fusion and capture beats are seen on the 12 lead ECG. What is the first line drug management?
Amiodarone
Preferred due to poor left ventricular function
What is the initial management of acute pulmonary oedema?
Sit up, loop diuretic
What drug should be given to patients with bradycardia and signs of shock?
500 micrograms of atropine (repeated up to max 3mg)
State the area of myocardium and coronary artery affected:
ST elevation in II, III and aVF
Inferior
RCA
State the area of myocardium and coronary artery affected:
ST elevation in V1-V2
Septal
Proximal LAD
State the area of myocardium and coronary artery affected:
ST elevation in V3-V4
Anterior
LAD
State the area of myocardium and coronary artery affected:
ST elevation in V5-V6
Apex
Distal LAD/LCx/RCA
State the area of myocardium and coronary artery affected:
ST elevation in I, aVL
Lateral
LCx
State the area of myocardium and coronary artery affected:
ST elevation in V7-V9 (ST depression V1-V3)
Posterolateral
RCA/LCx
What are the major Duke criteria for infective endocarditis?
Positive blood cultures or evidence of endocardial involvement
What criteria need to be fulfilled in order to confirm positive blood cultures according to the Dukes criteria?
- Two positive blood cultures showing typical organisms consistent with infective endocarditis, such as Streptococcus viridans and the HACEK group, or
- Persistent bacteraemia from two blood cultures taken > 12 hours apart or three or more positive blood cultures where the pathogen is less specific such as Staph aureus and Staph epidermidis
- Positive serology for Coxiella burnetii, Bartonella species or Chlamydia psittaci
- Positive molecular assays for specific gene targets
What criteria need to be fulfilled in order to confirm evidence of endocardial involvement according to the Dukes criteria?
- Positive echocardiogram (oscillating structures, abscess formation, new valvular regurgitation or dehiscence of prosthetic valves) or
- New valvular regurgitation
What are the minor Duke criteria for infective endocarditis?
- Predisposing heart condition or intravenous drug use
- Microbiological evidence does not meet major criteria
- Fever > 38ºC
- Vascular phenomena: major emboli, splenomegaly, clubbing, splinter haemorrhages, Janeway lesions, petechiae or purpura
- Immunological phenomena: glomerulonephritis, Osler’s nodes, Roth spots
How many of the Duke criteria need to be positive to diagnose infective endocarditis?
2 major criteria, or
1 major and 3 minor criteria, or
5 minor criteria
What forms of malignancy can predispose to pericarditis?
Lung cancer, breast cancer
What is the investigation of choice for a patient with suspected PE who has renal impairment?
V/Q scan
A 67-year-old female with a history of chronic lymphocytic leukaemia presents with a 3 day history of burning pain in the right lower chest wall. Clinical examination is unremarkable
What is the most likely diagnosis?
Shingles
Name one drug contraindicated in ventricular tachcardia?
Verapamil
What is the mechanism of action of alteplase?
Activates plasminogen to form plasmin
What is shown on the ECG?
Right bundle branch block:
- Broad QRS > 120 ms
- rSR’ pattern in V1-3 (‘M’ shaped QRS complex)
- wide, slurred S wave in the lateral leads (aVL, V5-6)
How do you calculate a CHA2DS2-VASc score?
One point would be allocated for each of the following:
- Congestive heart failure
- Hypertension (controlled or uncontrolled)
- Age of 65-74 years
- Diabetes
- Vascular disease
- Female sex
Two points would be awarded in two instances:
- An age of 75 years or over
- Prior stroke or thromboembolism.
What are the adverse effects of loop diuretics?
- Hypotension
- Hyponatraemia
- Hypokalaemia, hypomagnesaemia
- Hypochloraemic alkalosis
- Ototoxicity
- Hypocalcaemia
- Renal impairment (from dehydration + direct toxic effect)
- Hyperglycaemia (less common than with thiazides)
- Gout