DETECTION OF ABNORMAL CHANGES IN FLOW PULSATILITY CLINICALLY CORRELATED WITH ADVERSE EVENTS USING LOGFILE DATA
A method of determining adverse events from log file data from operation of an implantable blood pump. The method includes measuring a flow pulsatility from flow rate data recorded in a log file. A moving mean of the measured flow pulsatility is calculated. A moving standard deviation of the measured flow pulsatility is calculated. A difference between the moving mean of the measured pulsatility and the moving standard deviation of the measured flow pulsatility is calculated. If the difference is less than a first predetermined threshold, an alert is generated as the presence of an adverse event.
1 . A method of determining adverse events from log file data from operation of an implantable blood pump, comprising:
measuring a flow pulsatility from flow rate data recorded in a log file;
calculating a moving mean of the measured flow pulsatility;
calculating a moving standard deviation of the measured flow pulsatility;
calculating a difference between the moving mean of the measured pulsatility and the moving standard deviation of the measured flow pulsatility; and
if the difference is less than a first predetermined threshold, generating an alert as the presence of an adverse event.
2 . The method of claim 1 , further comprising calculating a difference between consecutive points of the moving standard deviation.
3 . The method of claim 2 , wherein if the difference between consecutive points of the moving standard deviation is less than a second predetermined threshold, the method further includes generating the alert as to the presence of the adverse event.
4 . The method of claim 2 , further including displaying the difference between consecutive points of the moving standard deviation.
5 . The method of claim 1 , further including displaying the moving standard deviation in the log file.
6 . The method of claim 1 , further including displaying the moving mean in the log file.
7 . The method of claim 1 , further including displaying the alert in the log file.
8 . The method of claim 1 , wherein the first predetermined threshold is less than a 1000.
9 . The method of claim 1 , wherein the second predetermined threshold is −180.
10 . The method of claim 1 , wherein the implantable blood pump is a ventricular assist device.
11 . A controller for an implantable blood pump, comprising:
processing circuitry configured to:
measure a flow pulsatility from flow rate data recorded in a log file;
calculate a moving mean of the measured flow pulsatility;
calculate a moving standard deviation of the measured flow pulsatility;
calculate a difference between the moving mean of the measured pulsatility and the moving standard deviation of the measured flow pulsatility; and
if the difference is less than a first predetermined threshold, generate an alert as the presence of an adverse event.
12 . The controller of claim 11 , wherein the processing circuitry is further configured to calculate a difference between consecutive points of the moving standard deviation.
13 . The controller of claim 12 , wherein if the difference between consecutive points of the moving standard deviation is less than a second predetermined threshold, the processing circuitry is further configured to generate the alert as to the presence of the adverse event.
14 . The controller of claim 12 , wherein the processing circuitry is further configured to display the difference between consecutive points of the moving standard deviation.
15 . The controller of claim 11 , wherein the processing circuitry is further configured to display the moving standard deviation in the log file.
16 . The controller of claim 11 , wherein the processing circuitry is further configured to display the moving mean in the log file.
17 . The controller of claim 11 , wherein the processing circuitry is further configured to display the alert in the log file.
18 . The controller of claim 11 , wherein the first predetermined threshold is less than 1000.
19 . The controller of claim 11 , wherein the second predetermined threshold is −180.
20 . A method of determining adverse events from log file data from operation of an implantable blood pump, comprising:
measuring a flow pulsatility from flow rate data recorded in a log file;
calculating a moving mean of the measured flow pulsatility;
calculating a moving standard deviation of the measured flow pulsatility;
calculating a difference between the moving mean of the measured pulsatility and the moving standard deviation of the measured flow pulsatility;
calculating a difference between consecutive points of the moving standard deviation;
if the difference is less than a first predetermined threshold, generating an alert as the presence of an adverse event; and
if the difference between consecutive points of the moving standard deviation is less than a second predetermined threshold, generating the alert as to the presence of the adverse event.