60 results about "Ventricular pressure" patented technology

A method and apparatus for determining whether a patient with congestive heart failure (CHF) will benefit from pacing therapy through the use of an implantable cardiac rhythm management device. A patient's right ventricular and left ventricular pressures are measured, and the patient's PP_Area is calculated for each normal heartbeat that occurs during the testing period. Depending upon the value of the patient's mean PP_Area, it can be determined whether the patient will or will not respond well acutely to pacing therapy. A mean PP_Area value of greater than or equal to a predetermined threshold, which is about 0.3, indicates that the patient is a responder to pacing therapy, while a value of less than the predetermined threshold of about 0.3 indicates that the patient is a non-responder.

An intra-ventricular pressure sensor device is provided that includes a catheter having a first lumen for receiving fluid flow therethrough, and a second, separate, fluid-filled, fluid-impermeable lumen extending between a pressure-sensitive component that is adapted to be exposed to an external pressure source, and a pressure sensor that is effective to measure pressure of the external pressure source in response to displacement of the pressure-sensitive component. The intra-ventricular pressure sensor device is particularly advantageous in that it allows a direct measurement of a patient's ventricular pressure to be obtained.

Techniques are provided for detecting left ventricular end diastolic pressure (LV EDP) using a pressure sensor implanted within the heart of a patient and for detecting and evaluating heart failure and pulmonary edema based on LV EDP. Briefly, the peak of the R-wave of an intracardiac electrogram (IEGM) is used to trigger the measurement of a pressure value within the left ventricle. This pressure value is deemed to be representative of LV EDP. In this manner, LV EDP is easily detected merely by measuring pressure at one point within the heartbeat—thereby eliminating any need to track ventricular pressure throughout the heartbeat. Techniques for detecting and evaluating heart failure and pulmonary edema based on the R-wave triggered LV EDP measurements are also set forth herein.

A system and method of determining hemodynamic parameters uses sensed ventricular blood pressure during a portion of ventricular pressure waveform following peak pressure. An estimated arterial diastolic pressure is based upon an amplitude of the sensed ventricular pressure corresponding to a time at which a first derivative of ventricular pressure as a function of time is at a minimum (dP / dtmin). Fill parameters such as isovolumetric relaxation constant, ventricular suction pressure, atrial kick pressure, and transvalve pressure gradient are derived from measured pressures representing minimum ventricular pressure, ventricular diastolic pressure, and diastasis pressure.

The invention discloses a cardiac impulse assist system, which comprises a ventricular volume regulating device, a synchronizer and a control device, wherein the ventricular volume regulating device is used for regulating ventricular volumes; a sensor of the synchronizer is connected to the heart; the synchronizer is used for collecting ventricular systole signals; and the control device is used for receiving the ventricular systole signals collected by the synchronizer, and is used for controlling the ventricular volume regulating device to synchronously reduce the ventricular volumes when ventricular systole is performed. An automatic defibrillating device and a synchronous treatment device are arranged in the synchronizer; a defibrillating electrode of the automatic defibrillating device is connected to the heart; a pacing electrode of the synchronous treatment device is implanted into a chamber of the heart. As the ventricular volume regulating device is small in size, the cardiac impulse assist system disclosed by the invention can be implanted into the chamber of the heart. The cardiac impulse assist system disclosed by the invention can be used for completely imitating a ventricular pressure-volume change rule, can work synchronously with cardiac impulse, and can be used for assist the heart to pulsate and do work so as to treat cardiac failure, promote ventricular restoration and repair the perforation of ventricular septum.