Measurement of cardiac cycle length and pressure metrics from pulmonary arterial pressure

A medical device system for monitoring a cardiovascular pressure signal, comprising:

• a sensor sensing a cardiovascular pressure signal and generating a corresponding sensor signal;
• a high pass filter high pass filtering the sensor signal to generate a sensed pressure signal;
• and
• a pressure analysis module configured to:
• determine whether a first derivative of the sensed pressure signal is greater than a first pressure threshold;
• determine a first maximum of the derivative of the pressure signal in response to the first derivative of the sensed pressure signal being greater than the first pressure threshold;
• determine whether the first derivative of the sensed pressure signal is greater than a second pressure threshold not equal to the first pressure threshold;
• determine a second a second maximum of the first derivative of the pressure signal in response to the first derivative of the sensed pressure signal being greater than the second pressure threshold;
• determine at least one of a systolic pressure or a diastolic pressure, wherein the at least one of a systolic pressure or a diastolic pressure is determined based on the first maximum of the first derivative signal in response to the pressure signal not being greater than the second threshold, and based on the second maximum of the derivative signal in response to the pressure signal being greater than the second threshold;
• and
• controlling delivery of at least one of electrical stimulation and a therapeutic agent in response to the determined at least one of a systolic pressure or a diastolic pressure.

A non-transitory computer readable medium having computer executable instructions for performing a method in an implantable medical device, the method comprising:

• sensing and high pass filtering the cardiovascular pressure signal to generate a resulting sensed pressure signal;
• determining whether a first derivative of the sensed pressure signal is greater than a first pressure threshold;
• determining a first a first maximum of the first derivative signal of the pressure signal in response to the first derivative of the sensed pressure signal being greater than the first pressure threshold;
• determining whether the first derivative of the sensed pressure signal is greater than a second pressure threshold not equal to the first pressure threshold;
• determining a second maximum of the first derivative of the pressure signal in response to the first derivative of the sensed pressure signal being greater than the second pressure threshold;
• determining at least one of a systolic pressure or a diastolic pressure, wherein the at least one of a systolic pressure or a diastolic pressure is determined based on the first maximum of the first derivative signal in response to the pressure signal not being greater than the second threshold, and based on the second second maximum of the first derivative signal in response to the pressure signal being greater than the second threshold;
• and
• controlling delivery of at least one of electrical stimulation and a therapeutic agent in response to the determined at least one of a systolic pressure or a diastolic pressure.