Suprasystolic measurement in a fast blood-pressure cycle
View Patent ↗Disclosed herein is a system for monitoring a patient that includes a cuff configured to inflate to at least partially occlude an artery of the patient and a cuff controller configured to inflate the cuff during a dynamic phase and generally maintain inflation of the cuff at about a target pressure during a static phase. The system also includes a sensor configured to receive a signal associated with the at least partially occluded artery and generate an output signal based on the received signal, and a cuff control module configured to determine the target pressure during the dynamic phase and based on the output signal, and control the cuff controller during the dynamic phase and the static phase.
1. A system for monitoring a patient, comprising:
a cuff configured to inflate to at least partially occlude an artery of the patient;
a cuff controller configured to inflate the cuff during a dynamic phase and generally maintain inflation of the cuff at about a target pressure during a static phase, wherein the target pressure is a suprasystolic pressure and the static phase is maintained for at least six cardiac cycles;
a sensor configured to receive a signal associated with the at least partially occluded artery and generate an output signal based on the received signal; and
a cuff control module configured to determine both a systolic pressure and the target pressure during the dynamic phase and based on the output signal, and control the cuff controller during the dynamic phase and the static phase.
2. The system of claim 1 , wherein the systolic pressure is determined in less than about 15 seconds.
3. The system of claim 1 , wherein the mean error has a standard deviation of less than about ±5 mmHg.
4. The system of claim 1 , wherein the sensor includes a pressure sensor.
5. The system of claim 1 , wherein the sensor is configured to operate with an oscillometric method.
6. The system of claim 1 , further including a signal analysis module configured to determine a hemodynamic parameter based on the output signal of the sensor, wherein the hemodynamic parameter includes at least one of a heart rate, a blood pressure, a vessel compliance, an aortic index, an augmentation index, a reflected wave ratio, and an indication of treatment.
7. The system of claim 6 , wherein the hemodynamic parameter is determined based on a first set of data obtained during the dynamic phase and a second set of data obtained during the static phase.
8. The system of claim 7 , wherein the first set of data are obtained over more than two cardiac cycles and the second set of data obtained over more than two cardiac cycles.
9. The system of claim 1 , wherein the target pressure is determined based on the systolic pressure and the systolic pressure is determined with a mean error of less than about 5 mmHg.
10. A system for monitoring a patient, comprising:
a cuff configured to inflate to at least partially occlude an artery of the patient;
a cuff controller configured to inflate the cuff during a single dynamic phase and generally maintain inflation of the cuff at about a target pressure during a static phase;
a sensor configured to receive a signal associated with the at least partially occluded artery and generate an output signal based on the received signal;
a cuff control module configured to determine both a systolic pressure and the target pressure during the single dynamic phase and based on the output signal, and control the cuff controller during the single dynamic phase and the static phase; and
a signal analysis module configured to determine a parameter based on the output signal of the sensor, wherein the parameter is determined based on a first set of data obtained over more than two cardiac cycles the single dynamic phase and a second set of data obtained during the static phase, the second set of data being obtained over a defined number of cardiac cycles immediately following the beginning of the static phase.
11. The system of claim 10 , wherein the target pressure is a suprasystolic pressure.
12. The system of claim 10 , wherein the systolic pressure is determined in less than about 15 seconds.
13. The system of claim 10 , wherein the mean error has a standard deviation of less than about ±5 mmHg.
14. The system of claim 10 , wherein the sensor includes a pressure sensor.
15. The system of claim 10 , wherein the sensor is configured to operate with an oscillometric method.
16. The system of claims 10 , wherein the parameter includes at least one of a heart rate, a vessel compliance, an aortic index, an augmentation index, a reflected wave ratio, and an indication of treatment.
17. The system of claim 10 , wherein the static phase is maintained for at least six cardiac cycles and the defined number of cardiac cycles includes six cardiac cycles.
18. The system of claim 10 , wherein the defined number of cardiac cycles includes at least ten cardiac cycles.
19. The system of claim 10 , herein the target pressure is determined based on the systolic pressure and the systolic pressure is determined with a mean error of less than about 5 mmHg.
20. A system for monitoring a patient, comprising:
a cuff configured to inflate to at least partially occlude an artery of the patient;
a cuff controller configured to inflate the cuff to a target pressure during a dynamic phase and, immediately following the dynamic phase, generally maintain inflation of the cuff at about the target pressure during a static phase;
a sensor configured to receive a signal associated with the at least partially occluded artery and generate an output signal based on the received signal;
a cuff control module configured to determine both a systolic pressure and the target pressure in real time during the dynamic phase and based on the output signal, and control the cuff controller during the dynamic phase and the static phase; and
a single analysis module configured to determine a parameter associated with a heart rate of the patient based on the output signal of the sensor, wherein the heart rate parameter is determined based on a first set of heart rate data obtained during the dynamic phase and a second set of heart rate data obtained during the static phase.
21. The system of claim 20 , wherein the target pressure is a suprasystolic pressure.
22. The system of claim 20 , wherein the systolic pressure is determined in less than about 15 seconds.
23. The system of claim 20 , wherein the mean error has a standard deviation of less than about ±5 mmHg.
24. The system of claim 20 , wherein the sensor includes a pressure sensor.
25. The system of claim 20 , wherein the sensor is configured to operate with an oscillometric method.
26. The system of claim 20 , further including a signal analysis module configured to determine a hemodynamic parameter based on the output signal of the sensor, wherein the hemodynamic parameter includes at least one of a blood pressure, a vessel compliance, an aortic index, an augmentation index, a reflected wave ratio, and an indication of treatment.
27. The system of claim 26 , wherein the hemodynamic parameter is determined based on a first set of data obtained during the dynamic phase and a second set of data obtained during the static phase.
28. The system of claim 20 , wherein the target pressure is determined based on the systolic pressure and the systolic pressure is determined with a mean error of less than about 5 mmHg.
29. The system of claim 20 , wherein obtaining at least one of the first set of heart rate data and the second set of heart rate data occurs over a plurality of cardiac cycles.
30. The system of claim 20 , wherein obtaining at least one of the first set of heart rate data and the second set of heart rate data occurs over ore than two cardiac cycles.
31. The system of claim 20 , wherein the second set of heart rate data are obtained over the first six cardiac cycles immediately following the beginning of the static phase.
32. The system of claim 20 , wherein the heart rate parameter includes a representation of a heart beat timing.
33. The system of claim 32 , wherein the first set of heart rate data includes a representation of a beat-to-beat timing.