IRWIN GRATZ
Physician in Penn Valley, PA
License number
Pennsylvania OS002976L
Category
Osteopathic Medicine
Type
Osteopathic Physician and Surgeon
Address
Address
Penn Valley, PA 19072
Professional information
Means And Apparatus For Continuously Determining Cardiac Output In A Subject
US Patent:
5183051, Feb 2, 1993
Filed:
Jan 14, 1991
Appl. No.:
7/640968
Inventors:
Jonathan Kraidin - Philadelphia PA
Irwin Gratz - Penn Valley PA
Irwin Gratz - Penn Valley PA
International Classification:
A61B 502
US Classification:
128687
Abstract:
A method for continuously determining cardiac output (CO) in a subject comprising continuously measuring arterial blood pressure data at a site and converting said arterial blood pressure data to a digital signal representative of a pulse contour curve waveform, calculating heart rate, grade of slope, systolic peak pressure, the presence of reflected waves, and pressure at the dicrotic notch from said digital signal; determining the area, SA, under said pulse contour from the start of a pulse to the dicrotic notch of said pulse contour curve; for any pulse which is reflective, subtracting from said area A any portion, B, of said area A, representing an approximate area due to wave reflection to obtain a stroke area, SA; and calculating CO as a product of SA and HR. Apparatus for continuously determining cardiac output (CO) in a subject comprising means for carrying out each step of the method are also disclosed.