QRS duration

Heart failure with reduced left ventricular ejection fracture associated with a prolonged baseline QRS duration.

A prolonged baseline QRS duration is an independent predictor of high post discharge morbidity and mortality.

Incremental prolongation of QRS duration over months demonstrated to correlate with deterioration of left ventricular systolic and diastolic function, resulting in a worsening prognosis.

Is not a fixed parameter and can have a difference of a few milliseconds, over the short-term, may be common.

Left ventricular function, presence of edema, QRS amplitude and hem dialysis may contribute to shortening or prolongation of the QRS duration over days.

Differential diagnosis for a wide-QRS-complex rhythm includes ventricular tachycardia, pre-excited tachycardias, supraventricular tachycardia with fixed or functional ab2242ant conduction, effects of drug use or abnormal electrolyte levels.

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