The Presence of Blood in a Strain Gauge Pressure Transducer Has a Clinical Effect on the Accuracy of Intracranial Pressure Readings.
Crit Care Explor
; 6(5): e1089, 2024 May 01.
Article
en En
| MEDLINE
| ID: mdl-38728059
ABSTRACT
IMPORTANCE Patients admitted with cerebral hemorrhage or cerebral edema often undergo external ventricular drain (EVD) placement to monitor and manage intracranial pressure (ICP). A strain gauge transducer accompanies the EVD to convert a pressure signal to an electrical waveform and assign a numeric value to the ICP. OBJECTIVES:
This study explored ICP accuracy in the presence of blood and other viscous fluid contaminates in the transducer.DESIGN:
Preclinical comparative design study.SETTING:
Laboratory setting using two Natus EVDs, two strain gauge transducers, and a sealed pressure chamber.PARTICIPANTS:
No human subjects or animal models were used.INTERVENTIONS:
A control transducer primed with saline was compared with an investigational transducer primed with blood or with saline/glycerol mixtures in massmass ratios of 25%, 50%, 75%, and 100% glycerol. Volume in a sealed chamber was manipulated to reflect changes in ICP to explore the impact of contaminates on pressure measurement. MEASUREMENTS AND MAINRESULTS:
From 90 paired observations, ICP readings were statistically significantly different between the control (saline) and experimental (glycerol or blood) transducers. The time to a stable pressure reading was significantly different for saline vs. 25% glycerol (< 0.0005), 50% glycerol (< 0.005), 75% glycerol (< 0.0001), 100% glycerol (< 0.0005), and blood (< 0.0005). A difference in resting stable pressure was observed for saline vs. blood primed transducers (0.041). CONCLUSIONS AND RELEVANCE There are statistically significant and clinically relevant differences in time to a stable pressure reading when contaminates are introduced into a closed drainage system. Changing a transducer based on the presence of blood contaminate should be considered to improve accuracy but must be weighed against the risk of introducing infection.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Transductores de Presión
/
Presión Intracraneal
Límite:
Humans
Idioma:
En
Revista:
Crit Care Explor
Año:
2024
Tipo del documento:
Article