Method and device in connection with pressure measurement
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Abstract
Pressure measurement device (2) including a pressure sensor (6) adapted to perform pressure measurements in the left ventricle of a heart (8). The sensor is connected to a measurement unit (10) to receive pressure measurement values obtained from the sensor, and to a processing means (12) for determining a set of pressure values, said processing means then determines a set of first order time derivative values determined from the set of pressure values. The said processing means also calculates a value of a prefined parameter of the set of first order time derivative values during said measurement period, the predefined parameter is the average or median value of the maximum value of the set of first order time derivative values, wherein the pressure measurements are performed during measurement periods using predetermined medical implant settings in a medical implant (20) controlling the application of stimulation pulses at least in the left and right ventricles of the heart, and that the implant setting include a first time difference 1 being the time between stimulations in the left and right ventricles.
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Citations
39 Claims
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1-21. -21. (canceled)
- 22. Pressure measurement device provided with a pressure sensor adapted to perform pressure measurements in the left ventricle of a heart, the pressure sensor is connected to a measurement unit to receive pressure measurement values obtained from said sensor, and a processing means adapted to determine, during a number of measurement periods, each including a number of heart cycles, a set of pressure values, and also a set of first order time derivative values determined from the set of pressure values, characterized in that said processing means also is adapted to calculate the maximum values of the set of first order time derivative values for each of the heart cycles during one measurement period, and to calculate a predefined parameter being the average or median value of the maximum values, wherein the pressure measurements are adapted to be performed during measurement periods related to different predetermined medical implant settings in a medical implant controlling the application of stimulation pulses at least in the left and right ventricles of the heart, and that an optimal implant device setting is identified as the setting where the predefined parameter is maximal.
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30. Method for monitoring, determining by measurement and calculation and graphically displaying physiological variables related to blood pressure, comprising at least following steps:
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a) detecting continuously during a measurement period left ventricular pressure of a heart (PLV), derived from a guidewire-mounted pressure sensor;
b) transducing said pressure to a processable signal and delivering said processable signal to a processing means being able to process said processable signal;
c) receiving said processable signal;
d) calculating the first order time derivative (dPLV/dt) of said left ventricular pressure by processing said signal;
e) forming and displaying a set of values representing the pressure (PLV) and the first order time derivative of said pressure (dPLV/dt);
f) calculating the value of a predefined parameter of said set of first order time derivative values during the measurement period, the predefined parameter is the average or median value of the maximum values of the set of first order time derivative values for each of the heart cycles during one measurement period, wherein the pressure measurements are performed during measurement periods using predetermined medical implant settings in a medical implant (20) controlling the application of stimulation pulses at least in the left and right ventricles of the heart, and that the implant setting includes a first time difference Δ
1 being the time between stimulations in the left and right ventricles, andg) displaying said calculated value in a measurement session list that may include calculated values from other measurement periods. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39)
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Specification