Cardiology Flashcards
3 causes of dominant a wave
- Pulmonary stenosis
- Pulmonary hypertension
- Rarely tricuspid stenosis
Cause of dominant v wave
Tricuspid regurgitation
3 causes of cannon a wave
- Complete heart block
- AV dissociation due to due to VT with retrograde atrial conduction
- Paroxysmal nodal tachycardia with retrograde atrial conduction
4 causes of elevated central venous pressure
- RV failure
- TR
- Pericardial disease - effusion, constrictive pericarditis
- SVC obstruction
What is an anacrotic arterial pulse?
Small volume with slow upstroke plus a wave on the upstroke. Caused by aortic stenosis
5 causes of collapsing pulse
- Aortic regurgitation
- Hyperdynamic circulation
- Arteriosclerotic aorta especially in aortic patients
- PDA
- Peripheral AV aneurysm
What is a bisferiens pulse?
Anacrotic plus collapsing pulse. Caused by aortic stenosis plus AR
Alternans pulse
Alternating strong and weak beats. Caused by LVF.
What does left parasternal impulse indicate?
- RVH
3. L atrial enlargement
Where do you listen for the PDA murmur?
Below the L clavicle
Mechanism of third heart sound and its causes
Mechanism: possibly tautening of the mitral or tricuspid cusps at the end f rapid diastolic filling.
LV S3 (lounder at apex and on expiration)
- Physiological if aged <40 or pregnant
- LVF
- AR
- MR
- VSD
- PDA
RV S3 (louder at the LSE and on inspiration)
- RVF
- Constrictive pericarditis
Mechanism of fourth heart sound and its causes
Mechanism: a high atrial pressure wave is probably reflected back from a poorly compliant ventricle. Always abnormal If heard.
LV S4
- AS
- Acute MR
- HTN
- HOCM
- IHD
RV S4
- PHTN
- Pulmonary stenosis
Cause of fixed splitting
Atrial septal defect
4 main causes of mitral stenosis
- Rheumatic heart disease
- Rarely congenital- eg parachute valve, with all chordae inserting into one papillary muscle
- SLE
- RA
5 clinical signs of severity of MS
- Small pulse pressure
- Early opening snap, which indicates raised LA pressure
- Length of the mid diastolic rumbling murmur, as it persists as long as there is a gradient
- Soft S1 (which indicates immobile valve cusps)
- Presence of PTHN, as indicated by prominent a wave, RV impulse, TR
4 signs of left atrial enlargement on chest xray
- Double density sign
- Oblique distance between outer ridge of the left atrium to the mid point of the left main bronchus >7cm
- Increased carinal angle >90 degrees
- Convexity of the left atrial appendage on PA film
Remember, that LA is the posterior structure on CXR.
R heart border - RA
Inferior border - RV
L heart border - LV, with minor contribution from left atrial appendage
Indications for surgery for MS
Exertional dyspnoea and falling valve area <1cm2 with signs of increasing right heart pressures
Need to be performed before pulmonary oedema or major haemoptysis have occurred
6 causes of CHRONIC mitral regurgitation
- Degenerative disease
- Mitral valve prolapse
- Rheumatic heart disease
- Papillary muscle dysfunction due to LVF or IHD
- CTD such as RA, ankylosing spondylitis
- Congenital - endocardial cushion defect, parachute valve
4 causes of ACUTE mitral regurgitation
- Infective endocarditis
- MI
- Surgery
- Trauma
5 clinical signs of severity of MR
- Enlarged LV
- Soft first heart sound
- Small volume pulse
- Signs of LVF
- Signs of PHTN
Effects of following on murmur of mitral valve prolapse:
- Valsalva manoeuvre
- Handgrip
- Squatting
- Valsalva manoeuvre - decreases preload, therefore murmur is longer and click is earlier
- Handgrip - increases afterload - murmur is shorter
- Squatting - increases preload, murmur is shorter
Causes of CHRONIC AR
Can be divided into VALVULAR causes and AORTIC ROOT causes
Valvular causes
- Rheumatic heart disease
- Bicuspid aortic valve
- Seronegative arthropathy
Aortic root causes
- Marfans syndrome
- Aortitis due to seronegative arthropathies, RA, syphilis
- Dissecting aneurysm
- Age
6 clinical signs of severity in chronic AR
- Collapsing pulse
- Wide pulse pressure
- Length of decrescendo murmur
- Third heart sound
- Signs of LVF
- Palpable thrill
3 indications for AR surgery
- Symptoms - exertional dyspnoea
- Worsening LV function such as low EF
- Progressive increase in LVEDD >55mm
5 clinical signs of severity in AS
- Palpable thrill
- Length, harshness and lateness of the peak of systolic murmur
- Fourth heart sound
- Signs of LVF
- Paradoxical splitting - delayed LV emptying leads to P2 before A2
5 clinical signs of pulmonary stenosis
2 causes?
- Peripheral cyanosis due to low cardiac output
- JVP showing giant a wave due to right atrial hypertrophy
- RV heave
- Thrill over the pulmonary area
- Harsh ejection systolic murmur maximal at the pulmonary area and on inspiration
Causes include congenital cause, carcinoid syndrome
6 Clinical signs of coarctation of aorta
Most common occurs just distal to the origin of the left subclavian artery
- Better developed upper body
- Radiofemoral delay
- Hypertension in the arms only
- Chest collateral vessels
- Mid-systolic murmur over the praecordium and back
- Features of Turner’s syndrome
Features to look for in Marfanoid habitus
- Arachnodactyly
- Joint hypermobility
- Blue sclerae
- High arched palate
- Pectus carinatum/excavatum
- AR or mitral valve prolapse on auscultation
- Arm span will exceed the height
7 causes of oedema
- Drugs - eg CCB
- CHF, constrictive pericarditis
- Renal - nephrotic syndrome
- Cirrhosis
- Malabsorption or starvation (assess nutrition)
- Thyroid myxoedema
- Protein losing enteropathy
Cardiac causes of clubbing
- Infective endocarditis
2. Cyanotic congenital heart disease
Causes of loud S1
Occurs when mitral or tricuspid valve cusps remain wide open at the end of diastole and shut forcefully with the onset of ventricular systole without diminution in flow towards the end of diastole.
Occurs in:
- Mitral stenosis
- Reduced diastolic filling time (eg tachycardia, any cause of short AV conduction time)
Causes of soft S1
- Prolonged diastolic filling time (first degree HB)
- Delayed onset of LV systole (LBBB)
- Failure of the leaflets to coapt normally (MR)
5 causes of increased normal splitting (wider on inspiration)
Any cause which delays RV emptying
- RBBB (delayed RV depolarisation)
- Pulmonary stenosis
- VSD (increased RV volume load)
- Mitral regurgitation (due to more rapid left ventricular emptying causing earlier aortic valve closure)
3 causes of pansystolic murmur
- MR
- TR
- VSD
Cause of late systolic murmur
Typical of mitral valve prolapse or papillary muscle dysfunction where mitral regurgitation begins in midsystole.
Explain the physiological changes with Valsalva manoeuvre as it relates to changes in murmur intensity
Initial rise in intrathoracic pressure and transient increase in LV output and blood pressure occurs
During straining phase, systemic venous return and hence filling of the R and L ventricles fall resulting in decrease in stroke volume and rise in heart rate. Given that stroke volume and arterial blood pressure fall, most cardiac murmurs become softer, but systolic murmur of HOCM increases and murmur of mitral valve prolapse begins earlier.
Evidence of severe AS on echocardiogram
- Area <1cm
- Gradient mean >40 mmHg
- Velocity >4m/s
Evidence of severe MS
- Stenosis <1cm
- Gradient >10mmHg
- RVSP >50 mmHg
Management of MS
Medically:
- Rate control and warfarin if AF present
- Diuretics
- Endocarditis prophylaxis
Surgically:
- Valvotomy
- Valve replacement if concurrent MR, class III or IV symptoms and pulmonary hypertension.
5 Clinical signs of severity of MR
- Third HS due to rapid ventricular filling from regurgitated blood from the atrium
- Small volume pulse
- LV enlargement and failure
- Pulmonary HTN
- Soft S1, early A2
2 main types of apex beat
- Pressure loaded - due to systolic overload. Forceful and SUSTAINED impulse (eg: AS, HTN)
- Volume loaded - forceful but UNSUSTAINED impulse (eg: in AR, MR)
Indications for MR surgery
- Class III or IV symptoms
- LV dysfunction
- Progressive increase in LV dimensions
Repair of a prolapsing posterior and often anterior leaflet is now undertaken earlier than valve replacement
If valve is repaired, mechanical is chosen usally (tissue valve in the mitral position have a relatively short life)
Signs of Marfan’s syndrome
Arachnodactyly Joint hypermobility Lens dislocation/lens replacement High arched palate Pectus carinatum/excavatum
CVS:
AR/MVP, coarctation of aorta
Check the back for kyphoscoliosis
Arm span will exceed the height
Upper segment to lower segment ratio will be less tha 0.85 (upper segment is from the crown to symphysis pubis, and lower segment is from the symphysis pubis to the ground)
Cholesterol target in IHD
Total cholesterol <4 mmol/L
LDL <1.8 mmol/L
Difference between streptokinase and tPA
Streptokinase is much cheaper, repeated administrations are not advisable as antibodies to streptokinase develop within few days and may case an allergic reaction to the second dose.
Alteplase have been shown to have small survival advantage probably as they are more effective at opening up clotted vessels, but slight increase in cerebral haemorrhage
Both are effective upto 12 hours after the onset of an infarct.
Compare and contrast LIMA grafts vs SVG
LIMA grafts have a higher long term patency rate (>90% at 10 years) vs SVG (50% at 10 years)
Bacterial causes of infective endocarditis
Strep viridans - usually presents subacutely
Strep faecalis - more common in older men with prostatism and younger women with UTI
Strep bovis - associated with colon polyps and carcinoma
Staph aureus - particularly in drug addicts
Staph epidermidis - more common with recent valve replacement
Gram negative HACEK group - more common with prosthetic valves: Haemophilus Acinobacter Cariobacterium hominius Eikonella spp Kingella kingae
Diagnostic criteria of infective endocarditis
According to Duke’s criteria: 2 major, 1 major/3 minor, or 5 minor criteria
Major criteria
- Typical organism in 2 separate blood cultures
- Evidence of endocardial involvement on echocardiogram
Minor criteria
- Predisposing cardiac condition/IVDU
- Fever
- Vascular phenomena or stigmata
- Serological or acute phase abnormalities
- Echo is abnormal but does not meet major criteria
Indications for valve surgery in infective endocarditis
- Resistant organism (eg fungi)
- Valvular dysfunction leading to mod-severe cardiac failure
- Persistent positive blood cultures despite treatment
- Invasive paravalvular infection causing conduction disturbances, or paravalvular abscess/fistula
- Recurrent major embolic phenomena
Indications for antibiotic prophylaxis to prevent IE
- Previous IE
- Prosthetic heart valve
- Congenital heart malformations
- Cardiac transplant with valve disease
For following procedures:
- Dental procedure or oral surgery
- GI/GU procedure - no prophylaxis is recommended
Contraindications for heart transplantation
- Substance abuse - alcohol and smoking
- CKD
- Pulmonary parenchymal disease
- Advanced liver disease
- Advanced age
Why is diltiazem used together with cyclosporine?
Diltiazem is cyclosporin sparing agent - dramatically reduces cyclosporin metabolism therefore the cost of treating patients.
Management post cardiac transplantation
- Biannual cardiac catheterisation to check for intimal proliferation causing IHD in the transplanted heart (form of rejection) - usually asymptomatic as heart is denervated
- Once lesions causing 40% coronary stenosis have occurred, the prognosis is quite poor.
- Once MI has occurred, 2 year survival rate is only 10-20%
- Cholesterol management is stilli mportant - Blood pressure control and management
- Increased risk of malignancy - skin cancers, PTLD (either primary infection or reactivation of EBV) - treated with acyclovir or interferon
- Endomysial biopsies if there are any signs of acute rejection (such as pericarditis)