Non-invasive cardiac monitoring system and method with communications interface
First Claim
1. A non-invasive cardiac monitoring apparatus, comprising:
- an implantable medical device coupled to an oxygen sensor, the oxygen sensor providing venous oxygen saturation data to the implantable medical device;
an oxygen consumption unit, the oxygen consumption unit producing oxygen consumption data using air exhaled by a patient; and
a processing unit that receives the venous oxygen saturation data from the implantable medical device and the oxygen consumption data from the oxygen consumption unit, the processing unit calculating a cardiac output result using the venous oxygen saturation data, the oxygen consumption data, and arterial oxygen saturation data, the cardiac output result provided at an output of the processing unit.
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Abstract
A system and method for determining a patient'"'"'s cardiac output in a non-invasive manner and transmitting cardiac output data to a remote host processor, a communications system, or a local output device is disclosed. A non-invasive cardiac monitoring approach utilizes an implantable medical device coupled to an oxygen sensor. The oxygen sensor provides venous oxygen saturation data to the implantable medical device. An oxygen consumption unit produces oxygen consumption data using air exhaled by a patient. A processing unit calculates a cardiac output result in real-time using the venous oxygen saturation data, the oxygen consumption data, and arterial oxygen saturation data assumed to be about 100% or acquired using a sensor external to the patient. The implantable medical device may transmit the venous oxygen saturation data to the processing unit using electromagnetic signals or acoustic signals. The implantable medical device may be a pacemaker, a pacemaker/cardioverter/defibrillator (PCD), an oxygen sensing device, or an implantable hemodynamic monitor. The processing unit may store the cardiac output data/result for a period of time and/or communicate the cardiac output result to the remote host processor substantially in real-time via a communications interface. The interface may include a modem, a computer interface, a network interface, or a communications system interface, for example. The processing unit may communicate the cardiac output result to the remote host processor in an analog, digital or optical form.
135 Citations
35 Claims
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1. A non-invasive cardiac monitoring apparatus, comprising:
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an implantable medical device coupled to an oxygen sensor, the oxygen sensor providing venous oxygen saturation data to the implantable medical device; an oxygen consumption unit, the oxygen consumption unit producing oxygen consumption data using air exhaled by a patient; and a processing unit that receives the venous oxygen saturation data from the implantable medical device and the oxygen consumption data from the oxygen consumption unit, the processing unit calculating a cardiac output result using the venous oxygen saturation data, the oxygen consumption data, and arterial oxygen saturation data, the cardiac output result provided at an output of the processing unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A non-invasive cardiac monitoring apparatus, comprising:
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an implantable medical device coupled to an oxygen sensor, the oxygen sensor providing venous oxygen saturation data to the implantable medical device; an oxygen consumption unit, the oxygen consumption unit producing oxygen consumption data using air exhaled by a patient; a processing unit that calculates a cardiac output result using the venous oxygen saturation data, the oxygen consumption data, and arterial oxygen saturation data assumed to be about 100% or acquired using a sensor external to the patient; and an interface, the processing unit communicating the cardiac output result to a remote host processor or to a local output device via the interface. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A non-invasive cardiac monitoring method, comprising:
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receiving venous oxygen saturation data from an implantable medical device coupled to an oxygen sensor; receiving oxygen consumption data using air exhaled by a patient; and calculating a cardiac output result using the venous oxygen saturation data, the oxygen consumption data, and arterial oxygen saturation data assumed to be about 100% or acquired using a sensor external to the patient. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification