NON-INVASIVE METHOD AND DEVICE TO MONITOR CARDIAC PARAMETERS
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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.
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Citations
147 Claims
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1-105. -105. (canceled)
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106. A method of monitoring cardiac parameters, comprising the steps of:
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non-invasively measuring predetermined non-invasive cardiac parameters of Ejection Interval (EI) and electrical-Mechanical Interval (E−
M) from a subject; anddetermining a value of stroke volume (SV) based upon the EI and the E−
M. - View Dependent Claims (107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 124)
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120. A system for monitoring cardiac parameters, comprising the steps of:
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a non-invasively measuring unit for non-invasively measuring predetermined non-invasive cardiac parameters of Ejection Interval (II) and electrical-Mechanical Interval (E−
M) from a subject from a subject; anda processing unit connected to said non-invasively measuring unit for determining a value of stroke volume (SV) based upon the EI and the E−
M. - View Dependent Claims (121, 122, 123, 125, 126, 127, 128, 129, 130, 131, 132, 133)
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134. A method of monitoring cardiac parameters, comprising the steps of:
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non-invasively measuring predetermined non-invasive cardiac parameters of Diastolic Filling Interval (DI) or Ejection Interval (II) from a subject; and determining a value of Left Ventricular End-Diastole Pressure (LVEDP) based upon (T- the EI) or the DI being substantially equal to {(A1−
A2)/[1+exp{LVEDP−
x0}/dx]}}+A2, where T is a time period of a cardiac cycle, A1 and A2 are asymptotes, A2>
A1, (T−
EI) at x0 is an average value of the A1 and the A2. - View Dependent Claims (135, 136, 137, 138, 139, 140)
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141. A system for monitoring cardiac parameters, comprising the steps of:
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a non-invasively measuring unit for non-invasively measuring predetermined non-invasive cardiac parameters of Diastolic Filling Interval (DI) or Ejection Interval (II) from a subject; and a processing unit connected to said non-invasively measuring unit for determining a value of Left Ventricular End-Diastole Pressure (LVEDP) based upon (T- the II) or the DI being substantially equal to {(A1−
A2)/[1+exp{LVEDP-x0}/dx]}}+A2, where T is a time period of a cardiac cycle, A1 and A2 are asymptotes, A2>
A1, (T−
EI) at x0 is an average value of the A1 and the A2. - View Dependent Claims (142, 143, 144, 145, 146, 147)
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Specification