The Science Journal of the American Association for Respiratory Care

2003 OPEN FORUM Abstracts

The Use of a Hard Board Underneath Adult Patients during High Frequency Oscillatory Ventilation.

John Davies, MA RRT; Ai Ching Kor, MD; Michael Gentile, RRT; Greg Ahearn, MD; Neil MacIntyre, MD; Duke University Medical Center, Durham, NC.

INTRODUCTION: High frequency oscillatory ventilation (HFOV) is a new ventilatory mode gaining more acceptance in the adult population. There was some concern expressed that a portion of each oscillation might be being transmitted through the mattress thereby reducing the effectiveness of the piston's forward motion. It was postulated that the use of a hard board underneath patients receiving HFOV might prevent unwanted transmission of the oscillations through the mattress. We decided to evaluate the practice of using a hard board compared to a firm mattress in relation to effect on amplitude and PaCO2.

Methods: Data were collected from adult patients who received HFOV for ARDS at Duke University Medical Center. We chose to follow abg's and amplitude changes as indicators of gas exchange. Data was collected at time 0 (baseline), initial readings once the patient was placed on the board (T1), 60 minutes after being on the board (T2), readings once the patient was placed back on the mattress (T3) and after 60 minutes of being back on the mattress (T4). Data were analyzed by ANOVA.

RESULTS: There was no significant change in amplitude, PaCO2, mean arterial blood pressure and heart rate when using the board as compared to the mattress as evidence by the chart below. 

  T0 T1 T2 T3 T4
Amplitude 64 65 64 64 62
PaCO2 43   40   42
MBP 86 92 88 90 86
HR 95 94 94 93 90



CONCLUSION: We conclude that there is no advantage to using a hard board underneath patients receiving HFOV.

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