dyssynchrony
Abnormal timing of myocardial contraction between different regions of the heart, often assessed to guide cardiac resynchronization therapy.
Full Definition
Cardiac dyssynchrony refers to the lack of coordinated contraction between different regions of the myocardium, commonly occurring in patients with heart failure and conduction abnormalities such as left bundle branch block. This mechanical dyssynchrony can be assessed using various imaging techniques including tissue Doppler, strain imaging, and cardiac MRI. The presence and severity of dyssynchrony help identify patients who may benefit from cardiac resynchronization therapy (CRT), as restoration of synchronous contraction can improve cardiac efficiency and clinical outcomes.
Usage
Usage note: Specify the type of dyssynchrony (mechanical vs. electrical) and measurement technique used for assessment.
In Context
- "Significant left ventricular dyssynchrony was demonstrated with a septal-to-lateral delay of 150 milliseconds." — CRT evaluation echocardiogram
- "Speckle tracking strain analysis revealed circumferential dyssynchrony suggesting potential CRT candidacy." — Heart failure assessment