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Echocardiography: Rheumatic Heart Disease Screening

Echocardiography is the reference tool for detecting rheumatic heart disease (RHD), the chronic valvular sequela of acute rheumatic fever that remains a leading cause of cardiovascular morbidity in children and young adults across Africa. Handheld and portable echocardiography enables school-based and community screening to identify subclinical disease before symptoms develop, when secondary penicillin prophylaxis can halt progression. Screening applies the World Heart Federation (WHF) criteria to classify definite, borderline and normal findings, chiefly assessing the mitral and aortic valves.

Indications

  • Population screening of school-age children (5-18 years) in RHD-endemic communities
  • A cardiac murmur or clinical suspicion of valvular disease
  • History of acute rheumatic fever or prior Sydenham chorea
  • Symptoms of exertional dyspnoea, palpitations, heart failure or embolic events in young patients
  • Confirmation and severity grading of suspected RHD before initiating prophylaxis
  • Follow-up of borderline or definite RHD to monitor progression or regression
  • Pre-pregnancy and antenatal assessment of women from endemic regions

Contraindications & Cautions

  • None - transthoracic echocardiography is non-invasive, non-ionising and safe in children and pregnancy
  • Operator dependence: screening should follow standardised protocols with quality assurance and confirmatory studies by experienced echocardiographers
  • Avoid over-diagnosis: borderline findings need expert confirmation before committing a child to long-term prophylaxis
  • Image quality may be limited by body habitus, poor acoustic windows or an uncooperative young child
  • Ensure appropriate consent/assent and psychosocial support given implications of a chronic diagnosis

Patient Preparation

  • Explain the painless nature of the test to the child and caregiver and obtain consent/assent
  • Position the child in the left lateral decubitus position; a calm, warm environment aids cooperation
  • Expose the chest and apply ECG leads if the device supports them for timing
  • No fasting or sedation required for standard screening
  • For field screening ensure the portable device is charged and images/clips can be stored for later expert review (tele-echo)
  • Record demographic data, prior rheumatic fever history and current prophylaxis status

Technique & Parameters

  • Use a portable or handheld echocardiography system with a phased-array cardiac probe; simplified single-parasternal-long-axis protocols exist for lay screeners with expert overread
  • Acquire parasternal long-axis and short-axis, and apical four- and five-chamber views
  • Interrogate the mitral and aortic valves with 2D imaging, colour Doppler and continuous/pulsed-wave Doppler
  • Apply WHF criteria: measure regurgitant jet length (>=2 cm for pathological mitral, >=1 cm for aortic), assess it is seen in two planes, holopansystolic/holodiastolic timing and peak velocity >=3 m/s
  • Assess morphological features: mitral leaflet thickening (>=3 mm), restricted leaflet motion, chordal thickening/fusion, and abnormal leaflet tip
  • Store representative clips for tele-echocardiography and confirmatory review by a cardiologist
  • Resource-limited alternative: task-shifted screening with focused protocols and remote expert interpretation improves reach where cardiologists are scarce

Systematic Review

  • Mitral valve: leaflet thickness, mobility, tip morphology, chordal apparatus and presence of prolapse or doming
  • Mitral regurgitation: jet length, extent in two views, holosystolic timing and peak velocity per WHF thresholds
  • Mitral stenosis: doming/hockey-stick anterior leaflet, restricted opening, and mean gradient/valve area if quantifiable
  • Aortic valve: leaflet thickening, coaptation and regurgitation jet by the WHF criteria
  • Chamber sizes and left ventricular size/function to gauge haemodynamic burden
  • Left atrial size (enlargement suggests significant mitral disease)
  • Pulmonary artery pressure estimate from tricuspid regurgitation where available
  • Pericardium and other valves to exclude alternative pathology; classify overall as definite, borderline or normal RHD

Key Findings & Significance

  • Definite RHD (WHF): pathological mitral regurgitation plus at least two morphological features of the mitral valve, or mitral stenosis, or pathological aortic regurgitation with morphological aortic change
  • Characteristic mitral morphology: leaflet thickening, restricted leaflet motion, focal tip thickening and chordal fusion
  • Mitral stenosis with anterior leaflet doming ('hockey-stick') and commissural fusion in advanced disease
  • Pathological mitral regurgitation: jet >=2 cm, seen in two planes, holosystolic, peak velocity >=3 m/s
  • Borderline RHD: pathological mitral or aortic regurgitation without the required morphological features, or morphological features without pathological regurgitation
  • Aortic regurgitation with leaflet thickening/restriction as an isolated or coexisting lesion
  • Left atrial enlargement and pulmonary hypertension in haemodynamically significant disease
  • Definite RHD warrants secondary penicillin prophylaxis to prevent recurrent rheumatic fever and progression

Differential Considerations

  • Mitral regurgitation with abnormal leaflets -> rheumatic valve disease vs mitral valve prolapse vs infective endocarditis vs congenital cleft
  • Isolated trivial mitral regurgitation without morphology -> physiological/normal-variant regurgitation vs borderline RHD
  • Mitral stenosis in a young patient -> rheumatic (commonest) vs congenital mitral stenosis
  • Aortic regurgitation -> rheumatic vs bicuspid aortic valve vs endocarditis vs connective-tissue disease
  • Thickened valve leaflets -> rheumatic change vs endocarditis vegetation vs degenerative/calcific change (rare at screening age)
  • Murmur with normal echo -> innocent/functional murmur or anaemia-related flow murmur

Pearls & Pitfalls

  • Physiological regurgitation is common in healthy children; only jets meeting all WHF criteria (length, two planes, timing and velocity) are pathological
  • Two morphological mitral-valve features plus pathological regurgitation are needed for a definite diagnosis - avoid over-calling on a single feature
  • Restricted leaflet motion and chordal thickening are the most specific rheumatic features
  • Borderline results should be re-screened and reviewed by an expert before committing to lifelong prophylaxis
  • Colour Doppler gain set too high fabricates or exaggerates regurgitant jets - optimise settings
  • Screen and interpret the aortic valve as well; isolated aortic involvement can be missed if attention is only on the mitral valve
  • Handheld-device screening should always pair with tele-echo overread for quality assurance
  • Correlate with clinical examination and rheumatic fever history; imaging alone should not replace the full clinical picture

Structured Report

  • State device used, views obtained and image quality/adequacy
  • Report mitral and aortic valve morphology and regurgitation/stenosis findings against WHF thresholds
  • Give the WHF classification: definite RHD, borderline RHD or normal
  • Grade severity of any valve lesion (mild/moderate/severe) and note chamber enlargement or pulmonary hypertension
  • Comment on left ventricular size and function
  • Impression: presence and category of RHD, severity, and haemodynamic significance
  • Recommend management: secondary penicillin prophylaxis for definite RHD, repeat screening/expert confirmation for borderline, and cardiology referral for significant disease

References

  • World Heart Federation Criteria for Echocardiographic Diagnosis of Rheumatic Heart Disease
  • WHO guidance on rheumatic fever and rheumatic heart disease control
  • American Society of Echocardiography valvular assessment guidelines
  • RADAR / echocardiographic screening programme literature (RadioGraphics and cardiology reviews)
  • American Heart Association scientific statement on acute rheumatic fever diagnosis

Educational clinical decision support only. Protocols vary by institution and equipment; always confirm with a qualified radiologist and local guidelines before clinical use.