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Noninvasive Assessment of Cardiac Resynchronization Therapy for Congestive Heart Failure Using Myocardial Strain and Left Ventricular Peak Power as Parameters of Myocardial Synchrony and Function
Author(s) -
POPOVIĆ ZORAN B.,
GRIMM RICHARD A.,
PERLIC GEORGE,
CHINCHOY EDWARD,
GERACI MARIA,
SUN JING PING,
DONAL ERWAN,
XU XIAOFANG,
GREENBERG NEIL L.,
WILKOFF BRUCE L.,
THOMAS JAMES D.
Publication year - 2002
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1046/j.1540-8167.2002.01203.x
Subject(s) - medicine , cardiac resynchronization therapy , cardiology , heart failure , ejection fraction , qrs complex , doppler echocardiography , doppler imaging , cardiac function curve , ventricular outflow tract , blood pressure , diastole
Resynchronization Therapy for Heart Failure.Introduction: Although invasive studies have shown that cardiac resynchronization therapy by biventricular pacing improves left ventricular (LV) function in selected heart failure patients, it is impractical to apply such techniques in the clinical setting. The aim of this study was to assess the acute effects of cardiac resynchronization therapy by noninvasive techniques. Methods and Results: Twenty‐two patients enrolled in the InSync trial ( age 64 ± 9 years, 18 men and 4 women; all with ejection fraction <35% and QRS >130 msec ) were studied 1 to 12 months after pacemaker implantation during pacing, and while ventricular pacing was inhibited. Regional myocardial strains of the interventricular septum, LV free wall, and right ventricular free wall were derived from color Doppler tissue echocardiography. Peak power index was calculated as a product of simultaneously recorded noninvasive blood pressure and pulse‐wave (PW) Doppler velocity of the LV outflow tract. The Z ratio (sum of LV ejection and filling times divided by RR interval) and tei index were calculated from PW Doppler data. During pacing, overall regional strain improved ( P = 0.01 ), while the LV strain coefficient of variation decreased from 2.7 ± 2.4 to 1.3 ± 0.7 ( P = 0.009 ). Additionally, peak power index improved from 84 ± 24 to 94 ± 27 cm · mmHg/sec ( P = 0.004 ). The Z ratio increased from 0.71 ± 0.08 to 0.78 ± 0.07 ( P = 0.0005 ), while the tei index decreased from 0.86 ± 0.33 to 0.59 ± 0.16 ( P = 0.0002 ). Conclusion: Using novel noninvasive indices, we demonstrated that cardiac resynchronization therapy improves LV performance.