The electromechanical window for arrhythmia-risk assessment.

Area of Science:

• Cardiology
• Electrophysiology
• Cardiac Mechanics

Background:

• The electromechanical window (EMW) reflects the temporal relationship between cardiac electrical activity and mechanical contraction.
• Ventricular arrhythmias pose a significant clinical challenge, necessitating improved risk stratification tools.

Purpose of the Study:

• To review the role of EMW in ventricular arrhythmia risk stratification.
• To standardize echocardiographic assessment of EMW.
• To define EMW cutoff values and discuss pathophysiological basis.

Main Methods:

• Review of current knowledge on EMW and arrhythmia risk.
• Standardized echocardiographic EMW assessment protocol.
• Definition of cutoff values for abnormal EMW (negative and positive).

Main Results:

• EMW is proposed as an independent predictor of ventricular arrhythmia risk.
• Standardized assessment and defined cutoff values are presented.
• Pathophysiological mechanisms underlying negative EMW are discussed.

Conclusions:

• EMW holds potential as a novel biomarker for ventricular arrhythmia risk stratification.
• Further research into cardiac electromechanical relations is warranted for proarrhythmic conditions.