Mean arterial pressure (MAP) derived prediction of future hypotension
There are provided systems and methods for performing mean arterial pressure (MAP) derived prediction of future hypotension. Such a system includes a hardware unit including a hardware processor and a system memory, a hypotension prediction software code stored in the system memory, and a sensory alarm. The hardware processor is configured to execute the hypotension prediction software code to receive MAP data of the living subject, and to transform the MAP data to one or more parameters predictive of a future hypotension event of the living subject. The hardware processor is further configured to execute the hypotension prediction software code to determine a risk score of the living subject corresponding to the probability of the future hypotension event based on at least some of the one or more parameters, and to invoke the sensory alarm if the risk score of the living subject satisfies a predetermined risk criteria.
1. A system for monitoring and evaluation of a living subject, the system comprising:
hemodynamic sensor configured to be attached to the living subject, sense an arterial pressure of the living subject, and generate a hemodynamic signal based on the arterial pressure of the living subject;
an analog-to-digital converter configured to receive the hemodynamic signal and convert the hemodynamic signal to hemodynamic data in digital form;
a display;
a system memory storing a hypotension prediction software code; and
a hardware processor configured to execute the hypotension prediction software code to:
determine mean arterial pressure (MAP) of the living subject based on the hemodynamic data;
determine a risk score of the living subject corresponding to a probability of the future hypotension event, wherein the risk score is determined by the hardware processor based upon MAP, and wherein the risk score is determined by a formula: risk score=1/(1+e −((a*MAP)+b)) , where a and b are numbers; and
display the risk score of the living subject on the display.
2. The system of claim 1 further comprising:
a sensory alarm;
wherein the hardware processor is configured to execute the hypotension prediction software code to invoke the sensory alarm if the risk score of the living subject satisfies a predetermined risk criteria.
3. The system of claim 2 , wherein the sensory alarm is one of visual alarm, an audible alarm, and a haptic alarm.
4. The system of claim 3 , wherein the visual alarm causes the risk score to be displayed on the display.
5. The system of claim 1 , wherein the hardware processor is configured to execute the hypotension prediction software code to determine the risk score of the living subject without comparison with data corresponding to hypotension in other living subjects.
6. The system of claim 1 , wherein the hardware processor is configured to convert the risk score to a percentage risk score between zero percent and one hundred percent for display on the display.
7. The system of claim 1 , wherein a and b are fixed numbers.
8. The system of claim 1 , wherein a and b are variable numbers.
9. The system of claim 1 , wherein the hemodynamic signal is obtained non-invasively from the living subject.
10. The system of claim 9 , wherein the hemodynamic signal is obtained non-invasively at an extremity of the living subject.
11. The system of claim 1 , wherein the hardware processor is configured to calculate a cardiac output (CO), a systemic vascular resistance (SVR), and a central venous pressure (CVP) using the hemodynamic data, and is configured to determine the MAP in accordance with MAP=(CO*SVR)+CVP.
12. The system of claim 1 , wherein the hardware processor is configured to calculate a systolic pressure (SP), and a diastolic pressure (DP) using the hemodynamic data, and is configured to determine the MAP in accordance with MAP (approximately)=(DP+⅓(SP−DP).
13. The system of claim 1 , wherein the hardware processor is configured to display the risk score as a fraction on the display.