Hemodynamic advantages of temperature sensing rate adaptive pacemaker.
During activity, the increase in body temperature triggers the pacemaker to adjust by increasing the rate. To assess the hemodynamic advantages twelve patients were studied. Heart function was measured by a noninvasive bioimpedance method. Heart functions were measured first at rest and then at the end of the exercise. Exercise was done in temperature mode and then later at a fixed heart rate. Cardiac output increased by 64% in temp mode compared to the fixed heart rate during the exercise. Stroke Volume increased by 38%. The Thoracic Fluid Index, Ventricular Ejection Time, Ejection Velocity Index and Ejection Fraction were unchanged. Hemodynamics are better in temp sensing rate responsive pacing during activity compared to fixed rate pacing. Clinically, the patients are doing well.
Rao
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Department of Cardiovascular Surgery, Shadyside Hospital, Pittsburgh, Pennsylvania 15232.
D000368:Aged; D002302:Cardiac Output; D005080:Exercise Test; D006339:Heart Rate; D006439:Hemodynamics / Q000502:physiology*; D006801:Humans; D010138:Pacemaker, Artificial; D013318:Stroke Volume; D013696:Temperature