Optimal values for corrected LVLED (≥75%) and composite anatomic distance (≥15 cm) predicted greater reverse LV remodeling after cardiac resynchronization therapy at 4.1 months.
Observational (n=61)
Do optimal interlead distance and left ventricular lead electrical delay predict reverse remodeling in patients undergoing cardiac resynchronization therapy?
Optimizing both interlead distance and left ventricular lead electrical delay during CRT implantation acts synergistically to predict greater left ventricular reverse remodeling.
BACKGROUND: Both anatomic interlead separation and left ventricle lead electrical delay (LVLED) have been associated with outcomes following cardiac resynchronization therapy (CRT). However, the relationship between interlead distance and electrical delay in predicting CRT outcomes has not been defined. METHODS: We studied 61 consecutive patients undergoing CRT for standard clinical indications. All patients underwent intraprocedural measurement of LVLED. Interlead distances in the horizontal (HD), vertical (VD), and direct (DD) dimensions were measured from postprocedure chest radiographs (CXR). Remodeling indices percent change in left ventricle (LV) ejection fraction, end-diastolic, end-systolic dimensions were assessed by transthoracic echocardiogram. RESULTS: There was a positive correlation between corrected LVLED and HD on lateral CXR (r = 0.361, P = 0.004) and a negative correlation between LVLED and VD on posteroanterior (PA) CXR (r =-0.281, P = 0.028). To account for this inverse relationship, we developed a composite anatomic distance (defined as: lateral HD-PA VD), which correlated most closely with LVLED (r = 0.404, P = 0.001). Follow-up was available for 48 patients. At a mean of 4.1 +/- 3.2 months, patients with optimal values for both corrected LVLED (>or=75%) and composite anatomic distance (>or=15 cm) demonstrated greater reverse LV remodeling than patients with either one or neither of these optimized values. CONCLUSIONS: We identified a significant correlation between LV-right ventricular interlead distance and LVLED; additionally, both parameters act synergistically in predicting LV anatomic reverse remodeling. Efforts to optimize both interlead distance and electrical delay may improve CRT outcomes.
Merchant et al. (Fri,) conducted a observational in Cardiac resynchronization therapy (n=61). Optimal corrected left ventricle lead electrical delay (≥75%) and composite anatomic distance (≥15 cm) vs. Suboptimal values for one or both parameters was evaluated on Reverse LV remodeling (percent change in LV ejection fraction, end-diastolic, and end-systolic dimensions). Optimal values for corrected LVLED (≥75%) and composite anatomic distance (≥15 cm) predicted greater reverse LV remodeling after cardiac resynchronization therapy at 4.1 months.