Non-invasive method and device to monitor cardiac parameters
First Claim
1. A method of monitoring an ischemic event, comprising the steps of:
- non-invasively measuring a plurality of predetermined non-invasive cardiac parameters from a subject; and
converting the non-invasive cardiac parameters into a single invasive cardiac analogue indicative of the ischemic event based upon a predetermined conversion equation,wherein the predetermined non-invasive cardiac parameters include heart rate as denoted by HR, ejection interval as denoted by EI, mean arterial pressure as denoted by MAP and electrical-mechanical interval as denoted by E-M, which is an interval between an electrical event E and a mechanical event M.
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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.
22 Citations
14 Claims
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1. A method of monitoring an ischemic event, comprising the steps of:
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non-invasively measuring a plurality of predetermined non-invasive cardiac parameters from a subject; and converting the non-invasive cardiac parameters into a single invasive cardiac analogue indicative of the ischemic event based upon a predetermined conversion equation, wherein the predetermined non-invasive cardiac parameters include heart rate as denoted by HR, ejection interval as denoted by EI, mean arterial pressure as denoted by MAP and electrical-mechanical interval as denoted by E-M, which is an interval between an electrical event E and a mechanical event M. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for monitoring an ischemic event, comprising:
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a measuring unit for non-invasively measuring a plurality of predetermined non-invasive cardiac parameters from a subject; and a converting unit connected to said measuring unit for converting the non-invasive cardiac parameters into a single invasive cardiac analogue indicative of the ischemic event based upon a predetermined conversion equation, wherein said measuring unit measures the predetermined non-invasive cardiac parameters including heart rate as denoted by HR, ejection interval as denoted by EI, mean arterial pressure as denoted by MAP and electrical-mechanical interval as denoted by E-M. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification