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A Study on Estimating the Blood Pressure by Using the Pulse Wave Transit Time in Shock Patients Who Received Vasopressor Drugs
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Gyeong Nam Park, Won Young Sung, Sang Won Seo, Sung Youp Hong, Young Mo Yang, Jang Young Lee, Nak Jin Sung, Hee Bum Yang
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Korean J Crit Care Med. 2009;24(1):11-16.
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DOI: https://doi.org/10.4266/kjccm.2009.24.1.11
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 Abstract
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- BACKGROUND
Blood pressure is clinically used for monitoring shock patients and as a therapeutic indicator for them.
Non-invasive blood pressure measurement has weak points such as the use of a cuff and it is a discontinuous measurement.
A method of measuring the blood pressure by using the PWTT (pulse wave transit time) has been studied to make up for those weak points. If blood pressure monitoring can be done by using the difference of the PWTT between different points in the body, then this method will be a quite useful to monitor the BP of seriously ill patients. This study aimed to verify whether or not the PWTT has a significant correlation with the blood pressure of shock patients who received vasopressor infusion and whether this method is clinically applicable.
METHODS
The study subjects were 20 shock patients who were hospitalized in intensive care units and they had received vasopressor, and we measured the PWTT and we analyzed its correlation with the SBP (systolic blood pressure) and DBP (diastolic blood pressure), as measured by non-invasive monitoring. We then determined the effects of the PWTT on the SBP and DBP.
RESULTS
From the results of correlation analysis between the PWTT and the SBP and DBP, the SBP displayed a statistically significant negative correlation with the PWTT of 18 patients, while no significant correlation between the PWTT and DBP was observed. At the same time, from the results of the regression analysis of the blood pressures and the PWTT of each patient, it was found that the PWTT had a negative effect on the SBP of all the patients, except two.
CONCLUSIONS
The PWTT has a negative correlation with the SBP of the patients who received vasopressor infusion.
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Citations
Citations to this article as recorded by  - Development of Blood Pressure Simulator for Test of the Arm-type Automatic Blood Pressure Monitor
S.H. Kim, S.U. Yun, M.H. Cho, S.J. Lee, M.H. Lim, S.Y. Seo, G.R. Jeon
Journal of Sensor Science and Technology.2015; 24(4): 239. CrossRef
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The Study of Rescuer's Fatigue by Changes of Compression-Vetilation Ratio using Manikin Model of the One-Rescuer CPR
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Hee Bum Yang, Young Mo Yang, Jong Wan Kim, Won Young Sung, Ho Lee, Jang Young Lee, Sung Youp Hong
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Korean J Crit Care Med. 2006;21(2):116-125.
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Abstract
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- BACKGROUND
The point of this study is focused on the rescuer's fatigue may increase as the ratio of chest compression-ventilation increases.
METHODS
10 students of emergency medical service and resucue had participated in this study. Cardiopulmonary resuscitation (CPR) was carried out with Laerdal's ResusciAnne with 4 types of compression-ventilation ratio (C-V ratio), and the data was recorded. The rescuer's fatigue was subjectively estimated with the visual analogue scale (VAS), objective fatigue was measured by median frequency which was acquired from the electromyography (EMG) signal, heart rate and the serum lactate level was measured.
Statistical analysis was accomplished within each C-V ratios.
RESULTS
As C-V ratio increased from 15 : 2 to 30 : 2, the quality of chest compression was improved. Subjective fatigue was increased significantly when C-V ratio increased to 30 : 2 from 15 : 2 and to 60 : 2 from 45 : 2. Gradual downward transition of the median frequency on EMG was shown as a result of increments of C-V ratio. Significant serum lactate accumulation had shown on ratio of 60 : 2 compare to other ratios.
CONCLUSIONS
Fatigue of the rescuers will be aggravated by increase of C-V ratio. Rapid rescuer change is preferable when C-V ratio is increased.
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