Non-invasive method and device to monitor cardiac parameters
First Claim
1. A system for retrofitting existing non-invasive cardiac parameter measuring devices to generate invasive cardiac analogues, comprising:
- an interface unit for receiving predetermined non-invasive cardiac parameters of a subject from the existing non-invasive cardio monitoring devices; and
a conversion unit connected to said interface unit for converting the non-invasive cardiac parameters into a plurality of the invasive cardiac analogues based upon a set of predetermined conversion equations, wherein said conversion unit outputs the predetermined invasive cardiac analogues including preload as denoted by P, afterload as denoted by A and contractility as denoted by C.
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Abstract
A method of and a device for non-invasively measuring the hemodynamic state of a subject or a human patient involve steps and units of non-invasively measuring cardiac cycle period, electrical-mechanical interval, mean arterial pressure, and ejection interval and converting the measured electrical-mechanical interval, mean arterial pressure and ejection interval into the cardiac parameters such as Preload, Afterload and Contractility, which are the common cardiac parameters used by an anesthesiologist. The converted hemodynamic state of a patient is displayed on a screen as a three-dimensional vector with each of its three coordinates respectively representing Preload, Afterload and Contractility. Therefore, a medical practitioner looks at the screen and quickly obtains the important and necessary information.
24 Citations
25 Claims
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1. A system for retrofitting existing non-invasive cardiac parameter measuring devices to generate invasive cardiac analogues, comprising:
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an interface unit for receiving predetermined non-invasive cardiac parameters of a subject from the existing non-invasive cardio monitoring devices; and a conversion unit connected to said interface unit for converting the non-invasive cardiac parameters into a plurality of the invasive cardiac analogues based upon a set of predetermined conversion equations, wherein said conversion unit outputs the predetermined invasive cardiac analogues including preload as denoted by P, afterload as denoted by A and contractility as denoted by C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification