CLINICAL STUDY: ELECTROPHYSIOLOGY
Left ventricular dysfunction after long-term right ventricular apical pacing in the young
M. Victoria T. Tantengco, MD, FAAC*,
Ronald L. Thomas, PhD and
Peter P. Karpawich, MD, FAAC*
* Division of Cardiology, Department of Pediatrics, Childrens Hospital of Michigan, Wayne State University School of Medicine, Detroit, Michigan, USA
Childrens Research Center of Michigan, Department of Pediatrics, Childrens Hospital of Michigan, Wayne State University School of Medicine, Detroit, Michigan, USA
Manuscript received September 29, 1999;
revised manuscript received February 26, 2001,
accepted March 14, 2001.
Reprint requests and correspondence: Dr. Tantengco, Pediatric Cardiology, 2nd Floor, Childrens Hospital of Michigan, 3901 Beaubien Boulevard, Detroit, Michigan 48201 mtanteng{at}dmc.org
OBJECTIVES
The goal of this study was to assess long-term global left ventricular (LV) function in patients paced from the right ventricular (RV) apex at a young age.
BACKGROUND
Ventricular contraction asynchrony with short-term RV apical pacing has been associated with reduced LV pump function and relaxation. The long-term effect of RV apical pacing on global LV function in the young remains unknown.
METHODS
Twenty-four patients with normal segmental anatomy paced from the RV apex (follow-up 1 to 19 years) underwent noninvasive assessment of global LV function with automated border detection echocardiography-derived fractional area of change (FAC), coupled with the Doppler index of myocardial performance (MPI). Data were analyzed from 24 RV-paced patients (mean follow-up 9.5 years, age 19 years, body surface area [BSA] 1.6 m2, QRS duration 140 ms) and compared with 33 age- and BSA-matched control subjects (age 16.4 years, BSA 1.6 m2). Multiple linear regression analysis was performed to identify patient variables that can affect these indexes of LV function.
RESULTS
Assessment of LV function (median follow-up 10 years) in 24 paced patients demonstrated impaired area- and Doppler flow-derived indexes of LV systolic and diastolic function, compared with those indexes of control subjects (FAC: 52% vs. 60%, p < 0.01; MPI: 0.46 vs. 0.34, p < 0.01). Paced QRS interval and age were found to significantly influence global LV contraction in these patients (R2 = 0.4, p < 0.05).
CONCLUSIONS
In the presence of impaired LV function with long-term RV apical pacing, alternative sites of ventricular pacing that simulate normal biventricular electrical activation should be explored to preserve function in pediatric patients in need of long-term pacing.
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Abbreviations and Acronyms
| | ABD | = (echocardiography-derived) automated border detection | | AV | = atrioventricular | | BSA | = body surface area | | +dP/dt | = maximal rate of rise of LV pressure | | FAC | = fractional area of change | | LV | = left ventricular or ventricle | | MPI | = (Doppler-derived) myocardial performance index | | RV | = right ventricular or ventricle |
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