What is the matrix of clinical impact in arrhythmia assessment used to cluster arrhythmias by threat to cardiac output?

• A. Matrix of clinical impact
• B. Electrophysiology map
• C. Hemodynamic chart
• D. Pacemaker index

Answer: (A)

Evaluating arrhythmias by how much they threaten cardiac output is the core idea here. A matrix of clinical impact provides a structured way to group rhythms based on their hemodynamic consequences, not just their electrical characteristics. This approach helps you gauge urgency and guide management: high-impact rhythms cause hypotension, syncope, chest pain, or signs of shock and typically require immediate intervention; moderate-impact rhythms cause some hemodynamic compromise but are often manageable with rapid pacing, rate control, or pharmacologic measures; low-impact rhythms are well tolerated and may be observed or treated more conservatively.

The other concepts don’t fit this clustering purpose as neatly. An electrophysiology map outlines electrical pathways and substrates in the heart, not how severely a rhythm disrupts cardiac output. A hemodynamic chart can track pressures or flows but isn’t the standardized framework used to categorize arrhythmias by threat level. A pacemaker index relates to pacing therapy or dependency, not systematic risk stratification by hemodynamic impact.