Assessment of ventricular function with an ambulatory left ventricular function monitor
Ishibashi, M.; Tamaki, N.; Yasuda, T.; Taki, J.; Strauss, H.W.
Circulation 83(4): Ii166-Ii172
1991
ISSN/ISBN: 0009-7322 PMID: 2009625 Document Number: 373453
Changes in ventricular function caused by activities of daily living, including standing, walking, stair climbing, and mental stress, were evaluated using a radionuclide device that recorded left ventricular function on a beat-by-beat basis. The ambulatory monitor was positioned over the patient's left ventricle after a gated blood pool scan. Monitoring revealed a 10% increase of left ventricular ejection fraction from baseline to brisk walking, an 18% increase during stair climbing, and a 6% increase with mental stress. In some subjects, however, the increase in ejection fraction during mental stress exceeded that during exercise.