Impaired systolic dysfunction of left ventricular longitudinal fibers: a sign of early hypertensive cardiomyopathy

Abstract

Background: Atrioventricular plane displacement (AVPD) study by M-mode echocardiography can supply useful clinical information about left ventricular (LV) long-axis function.

Hypothesis: We assessed the hypothesis that AVPD estimation could be used to detect early hypertensive cardiomyopathy.

Methods: The study population included 81 hypertensive patients with normal LV ejection fraction and fractional shortening, and 50 age- and gender-matched healthy controls. By utilizing M-mode and apical views, the following parameters were estimated: early mitral flow peak velocity (E) and deceleration time (DT), peak velocity of late mitral flow (A), A/E ratio, isovolumic relaxation time (IVRT), total AVPD, AVPD motion during atrial systole (At), systolic AVPD (total AVPD-At), and At/total AVPD ratio.

Results: Of 81 hypertensive patients, 16 (19.7%) had a normal (Group 1) and 65 (80.3%) an impaired LV relaxation filling pattern (Group 2). Mean total AVPD-At was significantly lower in Group 2 than in Group 1 (7.1 +/- 2 vs. 10.3 +/- 3 mm, p<0.001) and in Group 1 compared with healthy subjects (10.3 +/- 3 vs. 13.1 +/- 1 mm, p<0.001). Mean At and At/total AVPD were significantly higher in Group 2 than in Group 1 (46.9 +/- 8.6 vs. 37.7 +/- 8.7%, p<0.001), but not in Group 1 compared with healthy subjects (37.7 +/- 8.7 vs. 36 +/- 6%, p>0.05).

Conclusions: Hypertensive patients without overt systolic dysfunction demonstrate LV long-axis systolic dysfunction, while long-axis diastolic dysfunction always coexists with abnormal diastolic filling patterns. This suggests that long-axis systolic dysfunction precedes diastolic dysfunction at the same axis in hypertensive patients.