ANALYSIS OF METABOLIC GASES BY AN IMPLANTABLE CARDIAC DEVICE FOR THE ASSESSMENT OF CARDIAC OUTPUT
First Claim
1. An implantable cardiac device comprising:
- an extravascular, extracardiac sensor for measuring arterial blood gas content;
an intravascular sensor for measuring venous blood gas content; and
an electronic circuit for providing an indication of cardiac output based on the difference between said arterial and venous blood gas contents.
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Abstract
Analysis of metabolic gases by an implantable medical device allows the assessment of the status of a congestive heart failure patient by providing for the assessment of cardiac output. The present invention is directed to an implanted medical device configured to measure concentrations of metabolic gases in the blood to determine cardiac output of a patient. The device is also configured to measure changes in the cardiac output of a patient. The present invention is also directed to a method of measuring cardiac output by an implanted medical device. Further, the detection of changes in cardiac output utilizing an implanted medical device as disclosed herein is useful in a method of detecting exacerbation of congestive heart failure. The implanted medical device can also be used to pace a heart to modify cardiac output in a patient.
12 Citations
35 Claims
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1. An implantable cardiac device comprising:
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an extravascular, extracardiac sensor for measuring arterial blood gas content; an intravascular sensor for measuring venous blood gas content; and an electronic circuit for providing an indication of cardiac output based on the difference between said arterial and venous blood gas contents. - View Dependent Claims (2, 3, 4, 5, 10)
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17. A method for deriving an indication of cardiac output by an implantable cardiac device comprising:
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(a) measuring an arterial blood gas content extravascularly with an implanted sensor that is positioned outside a patient'"'"'s heart; (b) measuring a venous blood gas content intravascularly; and (c) deriving a measure of cardiac output from said measured arterial and venous blood gas content measurements. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 29, 30)
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31. A method of monitoring relative changes in cardiac output by an implantable cardiac device comprising:
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(a) measuring an arterial blood gas content extravascularly with an implanted sensor that is positioned outside a patient'"'"'s heart; (b) measuring a venous blood gas content intravascularly; (c) deriving a measure of cardiac output from said arterial and venous blood gas content measurements to detect relative changes in cardiac output. - View Dependent Claims (32, 33, 34)
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35-49. -49. (canceled)
Specification