apparatus and techniques: PDF OnlyEffect of the dynamic response of transducer-tubing system on accuracy of direct blood pressure measurement in patientsBOUTROS, AZMY MD; ALBERT, SAMUEL MD Author Information From the Division of Anesthesiology (Pediatric/Surgical ICU), The Cleveland Clinic Foundation, Cleveland, OH 44106. Critical Care Medicine: February 1983 - Volume 11 - Issue 2 - p 124-127 Buy Abstract The dynamic responses of 3 transducer-tubing systems (TTS) were documented using square and sine wave generators. The TTS tested were P23 ID with 5 feet tubing (P23–5'), P23 ID with 6 inches tubing (P23–6'') and P50A transducer with no tubing (P50). Natural frequencies were 45, 33, and 7 Hz for P50, P23–6'', and P23–5', respectively. All were underdamped (damping coefficients 0.1–0.3). Simultaneous measurements of blood pressures by the 3 TTS revealed that systolic pressures recorded by P23–5' were significantly higher (p < 0.001) than by P23–6'' (17%) and P50 (16%). This difference was not influenced by the size of the arterial cannula or by the heart rate. However, the differences were greater with radial, compared to brachial arterial cannulation (p < 0.02). There were no differences in systolic pressures measured with P23–6'' and P50. There were no differences in diastolic or electronic mean pressures recorded by the 3 TTS. © Williams & Wilkins 1983. All Rights Reserved.
