The Science Journal of the American Association for Respiratory Care

2002 OPEN FORUM Abstracts

HOW ACCURATE ARE DISPOSABLE MANOMETERS?

Chuck Terhune, Herng Lee Tan, Students, Respiratory Therapy Program Indiana University, Jeffery A. Attwood, RRT, Equipment Specialist, Respiratory Care, Clarian Health, Linda Van Scoder, EdD, RRT, Respiratory Therapy Program, Schools of Allied Health Sciences and Medicine, Indiana University.

BACKGROUND The use of manual resuscitation bags in neonates requires an inline manometer to measure the peak inspiratory pressure (PIP) delivered to them in order to prevent excessive pressure resulting in barotraumas and over-distension.

PURPOSE This study was carried out to determine the accuracy of disposable manometers.

METHODS This descriptive study included a convenience sample of thirty disposable manometers manufactured by three companies-Sims/Portex, EMS and Mercury. Ten manometers of each brand were tested at 20 cmH2O and 30 cmH2O. A mechanical device was designed to deliver consistent flow, rate and pressure throughout the testing. Ten readings for each of the thirty manometers were recorded at each pressure. The disposable manometer readings were compared to simultaneous pressure readings registered on a RT 200 calibration analyzer made by Timeter. The mean pressure, standard deviation and range for each brand were determined using Microsoft Excel descriptive statistics.

RESULTS At 20 cmH2O, EMS had the smallest mean, 21.42 cmH2O and the smallest percent error, 7.12%, among the 3 brands of manometers. At 20 cmH2O, Mercury had the largest mean, 22.72 cmH2O and the largest percent error, 13.63%. At 30 cmH2O, Mercury had the smallest mean, 31.63 cmH2O and smallest percent error, 5.44%. At 30 cmH2O, Sims/Portex had the largest mean, 33.04 cmH2O and the largest percent error, 10.15%.

CONCLUSION All 3 brands consistently underestimate the true PIP reading at 20 cmH2O and 30 cmH2O. At 20 cmH2O, EMS had the smallest percent error, standard deviation and range, hence it was the most accurate, reliable and consistent. At 30 cmH2O, Mercury had the smallest percent error, however, EMS had the smallest standard deviation and range, hence EMS was the most reliable and consistent but Mercury was the most accurate.

 
20 cmH2O
30 cmH2O
  Sims/Portex EMS Mercury Sims/Portex EMS Mercury
Mean 21.53 21.42 22.72 33.04 32.07 31.63
Standard Error 0.072 0.044 0.082 0.15 0.032 0.15
Percent Error/% 7.69 7.12 13.63 10.15 6.92 5.44
Median 21.55 21.5 23 32.8 32.1 32
Mode 20.7 21.5 21.8 33.4 32 31
Standard Deviation 0.72 0.44 0.82 1.59 0.32 1.58
Range 2.3 1.6 2 6.2 1.1 4.2
Minimum 20.6 20.4 21.7 30.6 31.5 29
Maximum 22.9 22 23.7 36.8 32.6 33.2

 

OF-02-026

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