Mitral valve disease (CV) Flashcards

1
Q

What is mitral stenosis?

A

Narrowing of the mitral valve orifice, often caused by rheumatic valvulitis producing fusion of the valve commissures and thickening of the valve leaflets

Decreased cross-sectional area of the valve, impairing blood flow from LA–>LV

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2
Q

What is mitral stenosis most commonly due to?

A

Rheumatic heart disease (90% of cases)

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3
Q

What are some signs of rheumatic fever (main cause of mitral stenosis)? (2)

A
  • prodromal illness
  • erythema marginatum - annular (ring-like) erythematous rash affecting trunk and inner surfaces of arms and legs; rings are barely raised and non-pruritic
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4
Q

How do we treat rheumatic fever? (Main cause of mitral stenosis)

A

IM benzylpenicillin or oral penicillin V

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5
Q

How do the causes of mitral stenosis differ between countries?

A
  • rheumatic fever is the main cause in low and middle-income countries
  • mitral annular calcification is the main cause in high-income countries
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6
Q

What can mitral stenosis lead to?

A
  • causes decreased filling of LV while simultaneously increasing LA pressure –> LA hypertrophy and dilation –> pulmonary congestion & oedema
  • as disease progresses, pulmonary hypertension and right heart failure occur
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7
Q

What is mitral regurgitation?

A

Leakage of blood from LV –> LA due to incomplete closure of mitral valve during systole

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8
Q

How common is mitral regurgitation?

A

Second most common mitral disease after aortic stenosis

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9
Q

What is the difference between primary and secondary mitral regurgitation?

A
  • primary MR - caused by direct involvement of valve leaflets
  • secondary MR - caused by changes of LV leading to valvular incompetence
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10
Q

What are some causes of primary mitral regurgitation? (3)

A
  • rheumatic fever - most common
  • infective endocarditis
  • mitral valve prolapse (young females)
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11
Q

What are some causes of secondary mitral regurgitation? (2)

A
  • coronary artery disease (common post-MI due to papillary wall rupture)
  • dilated cardiomyopathy
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12
Q

What is the most common cause of mitral regurgitation?

A

Rheumatic heart disease

(Others: infective endocarditis, mitral valve prolapse, papillary muscle rupture, annular calcification)

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13
Q

What can mitral regurgitation lead to?

A
  • increased backflow of blood from LV–>LA increases pressure and results in pulmonary hypertension
  • consequent atrial dilation increases risk of atrial fibrillation
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14
Q

What are some risk factors for secondary mitral valve disease? (2)

A
  • collagen disorders - Marfan syndrome (fibrillin-1 mutation), Ehlers-Danlos syndrome
    • collagen disorders characterised by widespread joint hypermobility along with skin changes indicated by striae
  • polycystic kidney disease (associated with mitral valve prolapse and mitral regurgitation)
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15
Q

What are some clinical features of mitral stenosis? (10)

A
  • dyspnoea
  • orthopnoea
  • paroxysmal nocturnal dyspnoea
  • fatigue
  • hoarseness - compression of recurrent laryngeal nerve by enlarged LA
  • dysphagia - compression of oesophagus by enlarged LA
  • haemoptysis
  • malar flush
  • palpitations (AF)
  • symptoms of right HF in later stages
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16
Q

What may you hear on auscultation in mitral stenosis? (3)

A
  • mid-diastolic murmur - best heard on expiration on left lateral side (left lateral decubitus)
  • loud S1, opening snap –> pre-systolic accentuation
  • severe MS - length of murmur increases + opening snap becomes closer to S2
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17
Q

What do you hear in severe mitral stenosis?

A

Length of murmur increases + opening snap becomes closer to S2

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18
Q

What might you see on examination in mitral stenosis? (10)

A
  • malar flush
  • neck vein distension
  • peripheral cyanosis
  • AF = irregularly irregular pulse
  • parasternal heave (RVH secondary to pulmonary hypertension)
  • mid-diastolic murmur (loudest in left lateral decubitus on expiration)
  • loud S1 + opening snap
  • Graham Steell murmur may occur
  • evidence of pulmonary oedema on auscultation (if decompensated)
  • ascites and peripheral oedema
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19
Q

What are the clinical features of mitral regurgitation - general? (8)

A
  • dyspnoea on exertion
  • decreased exercise tolerance
  • lower extremity oedema
  • fatigue
  • palpitations (AF)
  • diaphoresis (sweating)
  • pulmonary oedema
  • left-sided HF
20
Q

How does acute mitral regurgitation present?

A

Symptoms of LV failure

21
Q

How does chronic mitral regurgitation present?

A

May be asymptomatic or present with:

  • exertional dyspnoea
  • palpitations (if AF)
  • fatigue
22
Q

What is heard on auscultation in mitral regurgitation?

A
  • pansystolic (holosystolic) blowing murmur
  • loudest at apex beat
  • radiates to left axilla
  • soft S1
  • S3 may be heard (due to rapid ventricular filling in early diastole)
23
Q

What might you see on examination in mitral regurgitation? (4)

A
  • irregularly irregular pulse in AF
  • laterally displaced apex beat with thrusting (due to LV dilation)
  • pansystolic murmur - loudest at apex beat, radiates to left axilla, soft S1, S3 may be heard
  • signs of LV failure in acute MR
24
Q

What clinical feature might you observe in post-MI acute mitral regurgitation? (1 + 3)

A

Flash pulmonary oedema

  • frothy sputum
  • breathlessness
  • coarse bilateral lung crackles developing over a couple of hours
25
What are some risk factors for mitral stenosis? (5)
- streptococcal infection (rheumatic fever) - female sex - ergot medications (methysergide or ergotamine) - serotonergic medications (fenfluramine and dexfenfluramine) - SLE, amyloidosis, bronchial carcinoid syndrome
26
What are some risk factors for mitral regurgitation? (8)
- mitral valve prolapse - Hx rheumatic heart disease - infective endocarditis - Hx: cardiac trauma, MI, congenital heart disease, IHD - LV systolic dysfunction - HCM - anorectic/dopaminergic drugs - elevated systolic BP
27
What are the 1st-line investigations for mitral valve disease? (3)
- transthoracic echocardiography - ECG - CXR
28
What would a transthoracic echo show in mitral stenosis? (4)
- **hockey stick-shaped mitral deformity** - reduced mitral valve area - LA enlargement - evidence of pulmonary hypertension
29
What would transthoracic echo show in mitral regurgitation?
Presence and severity of MR; other structural and flow abnormalities
30
What would CXR show in mitral stenosis vs mitral regurgitation?
- MS - left atrial enlargement (double shadow in right cardiac silhouette, Kerley B lines) - MR - left atrial and ventricular enlargement (cardiomegaly, pulmonary oedema)
31
What would ECG show in mitral stenosis? (2)
- right ventricular hypertrophy - P-mitrale = broad notched bifid P-wave (MS --> LA enlargement --> LA makes greater contribution to P-wave contour)
32
What would ECG show in mitral regurgitation? (2)
- left ventricular hypertrophy - P-mitrale = broad notched bifid P-wave due to atrial enlargement
33
What would ECG show in mitral stenosis vs regurgitation? (3)
- MS - RVH - MR - LVH - both: P-mitrale (broad notched bifid P-wave due to LA enlargement); may also see AF
34
How often do you repeat echo in moderate-severe mitral regurgitation?
Performed every 6-12 months
35
What is the 1st-line management for asymptomatic mitral stenosis? (3)
- no therapy required - monitor with regular echos - if severe asymptomatic (gradient>5mmHg, valve area<1.5cm2) - consider balloon valvotomy, valve replacement or repair
36
What is the management for symptomatic mitral stenosis? (4)
- diuretic PLUS - balloon valvotomy OR valve replacement OR valve repair - anticoagulation if valve replacement - consider beta-blocker (atenolol) or ivabradine
37
What can you prescribe if signs of pulmonary oedema in mitral valve disease?
Furosemide (loop diuretic)
38
What is the management for severe mitral stenosis?
Percutaneous mitral valve commissurotomy
39
What is the management for mitral stenosis if pregnant? (2)
- diuretic (furosemide) - consider balloon valvotomy
40
What is the first-line management for acute mitral regurgitation?
Emergency surgery (annuloplasty = repair, mechanical valve and anticoagulation/bioprostheses, perioperative diuretics)
41
What is 1st-line for asymptomatic chronic mitral regurgitation? (4)
- surgery if LVEF<60% and/or LV-ESD>40mm - watchful waiting if not - ACEi (captopril) - BB (metoprolol)
42
What is 1st-line management for symptomatic chronic mitral regurgitation? (5)
- surgery if LVEF>30% - ACEi - BB - diuretics - intra-aortic balloon counterpulsation
43
In general, what is the 1st-line management for symptomatic vs asymptomatic mitral regurgitation?
Valve repair or replacement (if not suitable for surgery, transcatheter mitral valve intervention) Asymptomatic non-severe = watchful waiting (LVEF>60%, LV-ESD<40mm)
44
What is the management for heart failure in mitral valve disease? (2)
- nitrates - diuretics (furosemide) - can cause ototoxicity (hearing loss, tinnitus, balance issues)
45
What are some complications of mitral stenosis? (4)
- **atrial fibrillation** - all patients require anticoagulation with target INR 2.5 - stroke - warfarin-induced haemorrhage - infective endocarditis
46
What are some complications of mitral regurgitation? (7)
- atrial fibrillation - pulmonary hypertension - post-operative stroke - prosthesis stenosis - heart failure + LV dysfunction - pulmonary oedema - cardiogenic shock - treated with inotropes (dobutamine)