Lei Qu 1 Ross Hamilton 1 David Lee 1 Haniff Mohd Nor 2 Advisor Dr Andre Churchwell 3 Dr Paul King 1 Acknowledgments References Proposed Circuit Design Future Directions ID: 508085
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Slide1
Blood Pressure Monitor Re-Calibration
Lei Qu
1
, Ross Hamilton
1
,David Lee1, Haniff Mohd Nor2Advisor: Dr. Andre Churchwell3 , Dr. Paul King1
Acknowledgments
References
Proposed Circuit Design
Future Directions
.
1
Biomedical
Engineering, Vanderbilt University,
2
Mechanical Engineering ,
Vanderbilt
University,
3
Vanderbilt Medical Center Cardiology Department
.
Results
Test our re-calibration device
Adjust aesthetic and technical qualities to make it more compact and desirable
Reduce production costs with efficiency improvements
Optimize the circuit diagram and continue testing for improvements
We would like to thank Dr. Andre
Churchwell
for being our primary sponsor and advisor providing essential insight to our design process! Dr. Paul King also played a huge role as our secondary sponsor in all aspects of the project. Lastly, we would like to thank the VUMC Clinical Engineering Department and Jonathan Whitfield for their special assistance.
Figure 4. Schematic diagram of the proposed circuit design
Results and Proposed Design
Introduction
Monitoring the blood pressure of a hypertension patient is one of the most effective ways to treat hypertension
Traditional method -
Mercury Sphygmomanometer
:
Advantage: Accurate reading of an individual’s blood pressure Disadvantage: Training and certain skill set required; it is also hard to determine blood pressure since it is done through listening. Omron Digital Blood Pressure: Advantage: Convenience/easy to use Disadvantage: Lack of a method to re-calibrate the device
Objectives Verify that the variation between the digital blood pressure monitor and mercury sphygmomanometer is significant in terms of determining the stage of hypertension Investigate the causes of the variation between digital blood pressure monitors and mercury sphygmomanometers Design a calibration method for the observed variation in this project
Table above shows the measurements of blood pressure we took with the artificial arm (mmHg) Normal blood pressure on the arm is set for 120/80 mmHg Hypertension condition is set for 150/100 mmHg P-values are all below 0.05
Table above shows the measurements of blood pressure we took with the artificial arm with flatten arm band method applied (mmHg) Normal blood pressure on the arm is set for 120/80 mmHg P-value for systolic pressure is above 0.05 but for diastolic is below 0.05 Human error can be attributed in this difference Difference is smaller than 2 mmHg, normally ignored in clinical practice
Figure 1. Experimental setup for Omron
Figure 2. Experimental setup for sphygmomanometer
Figure 3. Proposed schematic design
Portable Digital Blood Pressure Monitor by Woradon Wattanapanitch and Warut Suampun http://instruct1.cit.cornell.edu/courses/ee476/FinalProjects/s2005/ww56_ws62/Final%20Project%20Web/index.html McManus RJ, Mant J, Hull MR, Hobbs FD. Does changing from mercury to electronic blood pressure measurement influence recorded blood pressure? An observational study. Br J Gen Pract. 2003 Dec;53(497):953-6. Heinemann M, Sellick K, Rickard C, Reynolds P, McGrail M. Automated versus manual blood pressure measurement: a randomized crossover trial. Int J Nurs Pract. 2008 Aug;14(4):296-302.