Discussion on the zero-calibration and the zero line in the measurement of central venous pressure and invasive arterial blood pressure
10.3760/cma.j.cn121430-20220926-00862
- VernacularTitle:中心静脉压和有创动脉血压测量过程中校零和零点位置的探讨
- Author:
Jing ZHOU
1
;
Xiangrong ZUO
;
Shaohua LIU
;
Minjuan CHU
;
Yali TIAN
Author Information
1. 南京医科大学第一附属医院重症医学科，江苏南京 210000
- Keywords:
Central venous pressure;
Invasive arterial blood pressure;
Zeroing;
Zero line;
Monitoring;
Accuracy of measurement
- From:
Chinese Critical Care Medicine
2023;35(3):316-320
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To figure out the timing of zeroing and the location of the zero line in the central venous pressure (CVP) monitoring and invasive arterial blood pressure (IBP) monitoring, and to provide scientific and accurate data for patients management.Methods:The liquid vessel models were used to simulate the pressure measurement process of the continuous pressure monitoring system. Based on the theory of fluid mechanics and the knowledge of blood pressure physiology and cardiovascular anatomy, the composition and influencing factors of the pressure in the fluid-filled catheter system during the zeroing and placing the transducer in the zero line of CVP and IBP, were analyzed.Results:The pressure in the liquid-filled catheter system was composed of atmospheric pressure, the pressure of pumping bag, the gravity of the water column (the vertical distance between the liquid level of Murphy's dropper and pressure transducer, ΔH), and the resistance of tube wall. This pressure value is set as a pressure of 0 mmHg (1 mmHg ≈ 0.133 kPa). In the process of pressure measurement, when the pressure transducer was placed at a horizontal position of 10 cm below the highest liquid level of the vessel, the pressure measured at different catheter tip positions was all 10 cmH 2O (1 cmH 2O ≈ 0.098 kPa); When the pressure transducer was placed at the horizontal position of the highest liquid level of the vessel, the measured pressure is 0 mmHg. Conclusion:Zeroing should repeatedly be performed only when one or more conditions (atmospheric pressure, pressure of pumping bag, gravity of ΔH water column and resistance of tube wall) are changed. In the measurement process, the pressure transducer should be placed at the zero line position at any time to eliminate the influence of hydrostatic pressure and to ensure the objective and accurate value.
