Key result
Restoring DDD pacing boosts cardiac output ~27% over VOO mode in dilated cardiomyopathy.
Why the study?
The impact of changing pacemaker mode from DDD to VOO on congestive heart failure progression in dilated cardiomyopathy patients was unclear.
Case Report (n=1)
No
Answers are grounded in this paper and cite their sources.
We describe a 62-year-old dilated cardiomyopathy patient in whom congestive heart failure progressed shortly after DDD mode was changed to VOO mode because of battery exhaustion. Emergency battery exchange with restoration of DDD mode improved his functional status to the previous level; pulmonary capillary wedge pressure decreased from 28 to 24 mmHg and cardiac output increased from 1.5 to 2.0 L/min associated with widening of the aortic pulse pressure. Maintenance of atrial contraction is therefore important even if left ventricular systolic function is markedly impaired and left ventricular end-diastolic pressure is increased.
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Iga et al. (1993) conducted a case report in Dilated cardiomyopathy with congestive heart failure (n=1). DDD mode pacing vs. VOO/VVI mode pacing was evaluated on Cardiac output (L/min). Restoration of DDD pacing from VOO mode in a patient with dilated cardiomyopathy improved cardiac output from 1.52 to 1.93 L/min and decreased pulmonary capillary wedge pressure.
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