Surgery – Truss – Pad
Patent
1991-06-25
1993-01-26
Howell, Kyle L.
Surgery
Truss
Pad
128675, 128780, 128687, A61B 0502
Patent
active
051815176
ABSTRACT:
Non-invasive apparatus and method for obtaining a quantitative determination of mean left atrial pressure or otherwise obtaining a quantitative determination of a left atrial pressure value. A balloon is inserted by means of a catheter into the esophagus and positioned adjacent the left atrium. The balloon is gradually inflated. A tracing of mean balloon pressure is obtained as the balloon is inflated. In addition, a tracing of balloon pressure on a steady baseline and with low frequency oscillations due to respiration filtered out is obtained whereby the tracing represents balloon pressure oscillations effected by left atrial pressure. In accordance with the oscillometric principle the mean balloon pressure is measured at the time when the amplitude of the balloon pressure oscillations effected by the left atrial pressure is at a peak. This mean balloon pressure is indicative of approximate mean left atrial pressure. Mean left atrial transmural pressure may be determined by subtracting therefrom the mean esophageal pressure as measured at a position in the esophagus where it is unaffected by the heart.
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Howell Kyle L.
Nasser Jr. Robert L.
The State University of New York
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