A 52-year-old man presents with exertional chest pain and dyspnea. On examination, a late systolic murmur is heard at the apex, preceded by a mid-systolic click. Echocardiography confirms mitral valve prolapse with mild regurgitation. Which investigation is most appropriate to assess the risk of sudden cardiac death and guide management in this patient?

Question

Accepted Answer

C. 24-hour Holter monitoring. ## Clinical Context
Mitral valve prolapse (MVP) with regurgitation carries a small but real risk of ventricular arrhythmias and sudden cardiac death, particularly in symptomatic patients with palpitations or syncope.

## Investigation of Choice: 24-Hour Holter Monitoring

**Key Point:** Holter monitoring detects occult ventricular arrhythmias (premature ventricular contractions, non-sustained ventricular tachycardia) that correlate with sudden cardiac death risk in MVP.

**High-Yield:** In MVP patients with:
  - Palpitations or syncope
  - Echocardiographic evidence of regurgitation
  - Redundant/thickened leaflets

Holter monitoring is the standard initial investigation to stratify arrhythmia risk and guide beta-blocker or antiarrhythmic therapy.

**Clinical Pearl:** The presence of complex ventricular ectopy on Holter (frequent PVCs, couplets, or NSVT) in MVP is an independent predictor of adverse outcomes and may warrant ICD consideration in high-risk subsets.

## Why Holter Monitoring?

| Feature | Relevance |
|---------|----------|
| Detects arrhythmias | MVP-related arrhythmias are paroxysmal; Holter captures them over 24 hrs |
| Non-invasive | Safe, repeatable, no contrast or radiation |
| Guides therapy | Presence/absence of arrhythmias determines need for beta-blockers or antiarrhythmics |
| Risk stratification | Arrhythmia burden predicts SCD risk |

## Other Investigations in MVP

| Investigation | Role in MVP |
|---|---|
| **Transoesophageal echo** | Better visualisation of posterior leaflet; not for risk stratification |
| **Cardiac MRI** | Assesses myocardial fibrosis; not standard in uncomplicated MVP |
| **Coronary angiography** | Indicated only if ischaemic chest pain or positive stress test; not for MVP risk assessment |
| **Exercise stress test** | May be used if exertional symptoms; Holter is primary for arrhythmia detection |

**Mnemonic:** MVP risk assessment = **HAREM**
  - **H**olter monitoring (arrhythmia detection)
  - **A**cute syncope / palpitations (symptoms prompting Holter)
  - **R**egurgitation severity (echo finding)
  - **E**chocardiography (baseline structural assessment)
  - **M**yxomatous changes (leaflet redundancy on echo)

![Cardiac Cycle diagram](https://mmcphlazjonnzmdysowq.supabase.co/storage/v1/object/public/blog-images/explanation/3288.webp)

Answer

A. Coronary angiography

Answer

B. Cardiac MRI with late gadolinium enhancement

Answer

D. Transoesophageal echocardiography

Explanation

Clinical Context

Investigation of Choice: 24-Hour Holter Monitoring

Why Holter Monitoring?

Other Investigations in MVP

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Feature	Relevance
Detects arrhythmias	MVP-related arrhythmias are paroxysmal; Holter captures them over 24 hrs
Non-invasive	Safe, repeatable, no contrast or radiation
Guides therapy	Presence/absence of arrhythmias determines need for beta-blockers or antiarrhythmics
Risk stratification	Arrhythmia burden predicts SCD risk

Investigation	Role in MVP
Transoesophageal echo	Better visualisation of posterior leaflet; not for risk stratification
Cardiac MRI	Assesses myocardial fibrosis; not standard in uncomplicated MVP
Coronary angiography	Indicated only if ischaemic chest pain or positive stress test; not for MVP risk assessment
Exercise stress test	May be used if exertional symptoms; Holter is primary for arrhythmia detection