Non-invasive method and device to monitor cardiac parameters
First Claim
1. A method of monitoring cardiac parameters, 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 plurality of invasive cardiac analogues based upon a set of predetermined conversion equations.
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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
105 Claims
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1. A method of monitoring cardiac parameters, 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 plurality of invasive cardiac analogues based upon a set of predetermined conversion equations. - 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, 26, 27, 28, 29)
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30. A system for monitoring cardiac parameters comprising:
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a non-invasive cardiac parameter measuring unit for non-invasively measuring a plurality of predetermined non-invasive cardiac parameters from a subject; and
a conversion unit connected to said non-invasive cardiac parameter measuring unit for converting the non-invasive cardiac parameters into a plurality of invasive cardiac analogues based upon a set of predetermined conversion equations. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55)
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56. 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. - View Dependent Claims (57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81)
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82. A method of determining a patient'"'"'s cardiac contractility, comprising the steps of:
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non-invasively measuring the patient'"'"'s electrocardiograph having a predetermined electrical wave;
determining a first point within a predetermined cardiac cycle based upon the predetermined electrical wave;
non-invasively measuring the patient'"'"'s arterial pressure with respect to time;
determining a second point in the predetermined cardiac cycle when a second derivative of a predetermined physiological function with respect to time reaches maximum; and
obtaining the cardiac contractility based upon the first point and the second point. - View Dependent Claims (83, 84, 85)
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86. A system for determining a patient'"'"'s cardiac contractility, comprising:
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an electrocardiogram unit for non-invasively measuring the patient'"'"'s electrocardiograph having a predetermined electrical wave;
an arterial pressure measuring unit for non-invasively measuring the patient'"'"'s arterial pressure with respect to time; and
a determination unit connected to said electrocardiogram unit and said arterial pressure measuring unit for determining a first point having a minimum within a predetermined cardiac cycle based upon the predetermined electrical wave and for determining a second point in the predetermined cardiac cycle when a second derivative of a predetermined physiological function with respect to time reaches maximum based upon the patient'"'"'s arterial pressure, said determination unit obtaining the cardiac contractility based upon the first point and the second point. - View Dependent Claims (87, 88, 89)
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90. 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. - View Dependent Claims (91, 92, 93, 94, 95, 96, 97)
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98. 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. - View Dependent Claims (99, 100, 101, 102, 103, 104, 105)
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Specification