System and method for monitoring a ventricular pressure index to predict worsening heart failure
First Claim
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1. A medical device for monitoring heart failure in a patient, the medical device comprising:
- an input circuit that receives a pressure signal representative of pressures sensed within a ventricle as a function of time; and
a processor that derives from the pressure signal a ventricular pressure index for a ventricular contraction based upon pressures in the ventricle and provides an output based upon the ventricular pressure index, wherein said ventricular pressure index corresponds to one of;
a heart failure status or a changing heart failure status;
wherein, for the ventricular contraction, the processor determines from the pressure signal a diastolic pressure in the ventricle and a systolic pressure in the ventricle and a diastolic pressure in a vessel into which the ventricle pumps blood; and
wherein the processor determines the ventricular pressure index for a ventricular contraction as a function of the systolic pressure in the ventricle, the diastolic pressure in the ventricle, and the diastolic pressure in the blood vessel.
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Abstract
A medical device monitors a patient to predict worsening heart failure. An input circuit of the medical device receives a pressure signal representative of a pressure sensed within a ventricle of the patient'"'"'s heart as a function of time. A processor derives from the pressure signal a ventricular pressure index for a ventricular contraction based upon pressures in the ventricle. The processor then provides an output based upon the ventricular pressure index.
15 Citations
19 Claims
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1. A medical device for monitoring heart failure in a patient, the medical device comprising:
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an input circuit that receives a pressure signal representative of pressures sensed within a ventricle as a function of time; and a processor that derives from the pressure signal a ventricular pressure index for a ventricular contraction based upon pressures in the ventricle and provides an output based upon the ventricular pressure index, wherein said ventricular pressure index corresponds to one of;
a heart failure status or a changing heart failure status;wherein, for the ventricular contraction, the processor determines from the pressure signal a diastolic pressure in the ventricle and a systolic pressure in the ventricle and a diastolic pressure in a vessel into which the ventricle pumps blood; and wherein the processor determines the ventricular pressure index for a ventricular contraction as a function of the systolic pressure in the ventricle, the diastolic pressure in the ventricle, and the diastolic pressure in the blood vessel. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for predicting worsening heart failure, the method comprising:
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for a ventricular contraction, sensing blood pressures within a ventricle of a patient'"'"'s heart as a function of time; deriving from the sensed blood pressures a ventricular pressure index based upon blood pressures in the ventricle; and providing an output based upon the ventricular pressure index, wherein said ventricular pressure index corresponds to one of;
a heart failure status or a changing heart failure status, and further comprising;determining from the sensed blood pressures a diastolic pressure in the ventricle and a systolic pressure in the ventricle; and a diastolic pressure in a blood vessel into which the ventricle pumps blood; and wherein determining a ventricular pressure index comprises determining the ventricular pressure index as a function of the systolic pressure in the ventricle, the diastolic pressure in the ventricle, and the diastolic pressure in the blood vessel. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A method for predicting worsening heart failure in a patient, the method comprising:
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sensing blood pressures within a patient as a function of time; determining from the sensed blood pressures a diastolic pressure in a ventricle of the patient'"'"'s heart, a systolic pressure in the ventricle and a diastolic pressure in a blood vessel into which the ventricle pumps blood; and deriving from the sensed blood pressures a ventricular pressure index corresponding to one of;
a heart failure status or a changing heart failure status, the ventricular pressure index based upon the systolic pressure in the ventricle, the diastolic pressure in the ventricle, and the diastolic pressure in the blood vessel; andproviding an output based upon the derived ventricular pressure index. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification