Electrocardiography and Doppler echocardiography for risk stratification in patients with chronic heart failure: Incremental prognostic value of QRS duration and a restrictive mitral filling pattern Original Research Article

Objectives This prospective study tested whether Doppler echocardiographic variables add incremental value to QRS duration in determining the prognosis of patients with chronic heart failure (CHF) and systolic dysfunction. Background Diastolic dysfunction frequently is observed in patients with CHF, but its prognostic impact relative to that of QRS duration is unknown. Methods A total of 193 patients with CHF and an ejection fraction <45% were enrolled prospectively. Echo measurements included left ventricular dimensions/volumes, ejection fraction, mitral early/late diastolic velocity ratio, deceleration time, and tissue Doppler mitral annular velocities. The mitral filling pattern was classified as either restrictive (RFP) or nonrestrictive. A cardiac event (cardiac death or urgent cardiac transplantation) was defined as combined study end point. Results During a follow-up of 385 ± 270 days, 24 patients suffered an event (cardiac death, n = 21; urgent transplantation, n = 3). The RFP, QRS duration, left ventricular systolic diameter, and mitral annular early diastolic velocity were independent predictors of an event. In patients with QRS duration >144 ms, the outcome was markedly poorer in the presence of RFPs as compared with their absence. Similarly, despite a QRS duration ≤144 ms, the outcome was worse in the presence of a RFP. A risk-stratification model based on the three strongest independent predictors separated groups into those with good prognosis and those with high, intermediate, and low event-free survival rates. Conclusions In subjects with CHF and systolic dysfunction, transmitral flow patterns add incremental value to QRS duration in determining the prognosis.