Patient monitoring system
A method of determining blood pressure measurements includes inflating a cuff, receiving an indication of pressure inside the cuff during inflation, determining a blood pressure based at least in part on the received indication, assigning a confidence level to the blood pressure, and determining whether the confidence level satisfies a threshold confidence level. Based at least on a determination that the confidence level satisfies a threshold confidence level, the method can include causing a display to display the blood pressure. Based at least on a determination that the confidence level does not satisfy a threshold confidence level, the method can include deflating the cuff, receiving an indication of pressure inside the cuff during deflation, determining another blood pressure, and causing a display to display a blood pressure.
1. A blood pressure monitoring system wearable by a monitored patient, the system comprising:
a housing;
an inflatable cuff configured to encompass a limb of a monitored patient;
a removable gas reservoir storing pressurized gas;
a chamber positioning the gas reservoir, wherein the housing is operably coupled with the chamber and the inflatable cuff to allow the blood pressure monitoring system to be worn on the limb of the monitored patient;
a gas pathway between the removable gas reservoir and the inflatable cuff;
at least one sensor configured to send a data signal indicative of a pressure inside the inflatable cuff;
a memory configured to store specific computer-executable instructions; and
a hardware processor in communication with the memory and configured to execute the specific computer-executable instructions to at least:
receive, from the at least one sensor, the data signal during a first inflation of the inflatable cuff;
determine, based on at least the data signal, a first blood pressure of the monitored patient during the first inflation of the inflatable cuff;
determine a confidence level of the first blood pressure;
determine that the confidence level of the first blood pressure is outside of a threshold confidence level;
based on the determination that the confidence level of the first blood pressure is outside of the threshold confidence level, cause a first deflation of the inflatable cuff and receive, from the at least one sensor, the data signal during the first deflation of the inflatable cuff;
determine, based on at least the data signal, a second blood pressure of the monitored patient during the first deflation of the inflatable cuff;
determine a confidence level of the second blood pressure;
determine that the confidence level of the second blood pressure is outside of the threshold confidence level; and
based on the determination that the confidence level of the second blood pressure is outside of the threshold confidence level, output an error indicating that at least one of the confidence level of the first blood pressure and the confidence level of the second blood pressure do not satisfy the threshold confidence level.
2. The blood pressure monitoring system of claim 1 , wherein the hardware processor is further configured to cause the first deflation of the inflatable cuff by sending a control signal to cause an actuation of a valve of the inflatable cuff, the valve configured to control a flow of gas out of the inflatable cuff.
3. The blood pressure system of claim 2 , wherein the hardware processor is further configured to cause the actuation of the valve of the inflatable cuff via pulse width modulation.
4. The blood pressure monitoring system of claim 1 , wherein the system further comprises a display configured to display at least one of the first blood pressure and the second blood pressure based on a comparison between the confidence level of the first blood pressure and the confidence level of the second blood pressure.
5. The blood pressure monitoring system of claim 1 , wherein the hardware processor is further configured to generate a recommendation that additional blood pressure measurements be taken.
6. The blood pressure monitoring system of claim 5 , wherein the generated recommendation prompts a user for user input, wherein the hardware processor is further configured to:
receive the user input via a user interface of the blood pressure monitoring system; and
responsive to the user input, send a control signal to cause an actuation of a valve of the inflatable cuff to cause a second inflation of the inflatable cuff, the valve configured to control a flow of gas into the inflatable cuff.
7. The blood pressure monitoring system of claim 1 , wherein the hardware processor is further configured to:
based on a determination that the confidence level of the first blood pressure and the confidence level of the second blood pressure are outside of the threshold confidence level, send a control signal to cause an actuation of a valve of the inflatable cuff to cause a second inflation of the inflatable cuff, the valve configured to control a flow of gas into the inflatable cuff.
8. The blood pressure monitoring system of claim 1 , wherein the hardware processor is further configured to:
determine, during the first inflation of the inflatable cuff, a systolic pressure as a magnitude oscillation of the data signal, and a diastolic pressure as a slope of the data signal prior to the magnitude oscillation; and
determine, during the first deflation of the inflatable cuff, a systolic pressure as a first slope of the data signal prior to a magnitude oscillation, and a diastolic pressure as a second slope of the data signal after the magnitude oscillation.
9. The blood pressure monitoring system of claim 8 , wherein during the first inflation of the inflatable cuff, the magnitude oscillation is the largest magnitude oscillation of the data signal, and the slope is the largest slope of the data signal prior to the largest magnitude oscillation.
10. The blood pressure monitoring system of claim 8 , wherein during the first deflation of the inflatable cuff, the magnitude oscillation is the largest magnitude oscillation of the data signal, the first slope is the largest slope of the data signal prior to the largest magnitude oscillation, and the second slope is the largest slope of the data signal after the largest magnitude oscillation.
11. A method of determining one or more blood pressure measurements, the method comprising:
under control of a hardware processor:
receiving, from at least one sensor configured to send a data signal indicative of a pressure inside an inflatable cuff, the inflatable cuff configured to encompass a limb of a monitored patient, the data signal indicative of the pressure inside the inflatable cuff during a first inflation of the inflatable cuff;
determining, based on at least the data signal, a first blood pressure of the monitored patient during the first inflation of the inflatable cuff;
determining a confidence level of the first blood pressure;
determining that the confidence level of the first blood pressure is outside of a threshold confidence level;
based on determining that the confidence level of the first blood pressure is outside of the threshold confidence level, causing a first deflation of the inflatable cuff and receiving, from the at least one sensor, the data signal during the first deflation of the inflatable cuff;
determining, based on at least the data signal, a second blood pressure of the monitored patient during the first deflation of the inflatable cuff;
determining a confidence level of the second blood pressure;
determining that the confidence level of the second blood pressure is outside of the threshold confidence level; and
based on determining that the confidence level of the second blood pressure is outside of the threshold confidence level, outputting an error indicating that at least one of the confidence level of the first blood pressure and the confidence level of the second blood pressure do not satisfy the threshold confidence level.
12. The method of claim 11 , wherein causing the first deflation of the inflatable cuff comprises sending a control signal to cause an actuation of a valve of the inflatable cuff, the valve configured to control a flow of gas out of the inflatable cuff.
13. The method of claim 12 , wherein causing the actuation of the valve of the inflatable cuff comprises using pulse width modulation.
14. The method of claim 11 , the method further comprising displaying at least one of the first blood pressure and the second blood pressure based on a comparison between the confidence level of the first blood pressure and the confidence level of the second blood pressure.
15. The method of claim 11 , the method further comprising generating a recommendation that additional blood pressure measurements be taken.
16. The method of claim 15 , wherein generating the recommendation comprises prompting a user for user input, wherein the method further comprises:
under control of a hardware processor:
receiving the user input via a user interface communicatively coupled with the hardware processor; and
responsive to the user input, sending a control signal to cause an actuation of a valve of the inflatable cuff to cause a second inflation of the inflatable cuff, the valve configured to control a flow of gas into the inflatable cuff.
17. The method of claim 11 , the method further comprising:
based on determining that the confidence level of the first blood pressure and the confidence level of the second blood pressure are outside of the threshold confidence level, sending a control signal to cause an actuation of a valve of the inflatable cuff to cause a second inflation of the inflatable cuff, the valve configured to control a flow of gas into the inflatable cuff.
18. The method of claim 11 , the method further comprising:
determining, during the first inflation of the inflatable cuff, a systolic pressure as a magnitude oscillation of the data signal, and a diastolic pressure as a slope of the data signal prior to the magnitude oscillation; and
determining, during the first deflation of the inflatable cuff, a systolic pressure as a first slope of the data signal prior to a magnitude oscillation, and a diastolic pressure as a second slope of the data signal after the magnitude oscillation.
19. The method of claim 18 , wherein determining the systolic pressure and the diastolic pressure during the first inflation of the inflatable cuff comprises determining that the magnitude oscillation is the largest magnitude oscillation of the data signal, and the slope is the largest slope of the data signal prior to the largest magnitude oscillation.
20. The method of claim 18 , wherein determining the systolic pressure and the diastolic pressure during the first deflation of the inflatable cuff comprises determining that the magnitude oscillation is the largest magnitude oscillation of the data signal, the first slope is the largest slope of the data signal prior to the largest magnitude oscillation, and the second slope is the largest slope of the data signal after the largest magnitude oscillation.