Dynamic myocardial velocity changes between phases of the cardiac cycle.

Abstract

The purpose of this study was 1. to define relationships between myocardial velocities according to phases and the range of dynamic phasic changes in controls using tissue Doppler echocardiography (TDE); 2. to compare the usefulness of dynamic changes vs. peak velocities alone on controls and patients. Peak velocity changes between phases were studied by colour M-mode TDE in the posterior wall from pre-ejection to systole (ejectional wall velocity increase) and from ejection to early diastole (early diastolic wall velocity increase) in 17 age-matched controls and a group of 30 patients with dilated cardiomyopathies (CMy) consisting of ischaemic (14) and nonischaemic (16) CMy with similar clinical and echocardiographic presentations. Systolic were correlated with early diastolic peak velocities (r = 0.79 p < 0.0001). Velocity values were significantly lower in patients than in controls (p < 0.001) as well as dynamic ejectional (p = 0.02) and early diastolic (0.03) increases. Dynamic changes were closely similar to controls (74 +/- 7%, 46 +/- 14%) in nonischaemic CMy (66 +/- 18%, 39 +/- 10% NS, respectively), but markedly reduced in ischaemic CMy (28 +/- 59%, and 26 +/- 31%, p = 0.005 and p = 0.06 vs. nonischaemic CMy, respectively). Of patients with ischaemic CMy, 78% had an ejectional increase < 40% and/or an early diastolic increase < 25%. Thus, correlation exists between systolic and early diastolic velocities. Normal range of dynamic changes was defined in an elderly population. Results suggest that velocity dynamics might be more informative than peak velocities alone to show left ventricular dysfunction.