Key result
Prolonged QRS duration in dilated cardiomyopathy correlated with reduced peak +dP/dt (r=-0.48) and prolonged contraction (r=0.51) and relaxation (r=0.52) times.
Observational (n=50)
No
Prolonged QRS duration in dilated cardiomyopathy adversely affects left ventricular pressure pulse characteristics, including reduced peak +dP/dt and prolonged relaxation time, which should be considered when assessing myocardial function.
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May link QRS prolongation to impaired LV mechanics in DCM; leaves open causal and therapeutic implications.
Xiao et al. (1992) conducted an observational in Dilated cardiomyopathy (n=50). QRS duration was evaluated on Characteristics of the left ventricular pressure pulse (contraction, relaxation times, and +dP/dt). Prolonged QRS duration in dilated cardiomyopathy correlated with reduced peak +dP/dt (r=-0.48) and prolonged contraction (r=0.51) and relaxation (r=0.52) times.
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