Frequency adjustment does not effect hemodynamics during high frequency oscillatory ventilation in an animal model

Michael A. Gentile, Damian S. Craig, George C. Quick, Jay Davis, Ira M. Cheifetz, Jon N. Meliones

Research output: Contribution to journalArticle

Abstract

Background: Controversy exists concerning the ideal frequency settings to use during high frequency oscillatory ventialtion (HFOV). The HFOV frequency setting affects the ventilator rate and the delivered tidal volume. We hypothesized that a lower frequency would improve gas exchange but at the expense of cardiopulmonary function. Method: 10 swine with a mean weight of 6.13 ±0.97 kg were placed on HFOV (Sensormedics 3100B, Yorba Linda, CA). Each animal was instrumented with an arterial line, pulmonary artery flow probe (Cardiac Output, CO), and pulmonary artery pressure catheter (PAP). Pulmonary vascular input resistance (PVR) was calculated as the ratio of PA to CO. HFOV settings included amplitude 40 cmH2O, mean airway pressure 10 cmH2O, FiO2 0.40, and inspiratory time 33%. Animals were ventilated at 5 Hz, 5 Hz + 11pm inhaled CO2, or 12 Hz for periods of 15 minutes in a random order. At the end of each 15 minute period, data were collected. Up to ten data sets were collected on each animal, a total of 98 data sets were analyzed. Effects of the frequency setting were tested using ANOVA with repeated measures. Conclusions: We have demonstrated that a lower HFOV frequency (5 Hz) results in a predictable decrease in PaCO2 by increasing tidal volume. There are no hemodynamic differences seen between 5 Hz + CO2 and 12 Hz. This data suggests that increasing tidal volumes in HFOV does not adversely effect hemodynamics. Results: Frequency (Hz) PaCO 2 (torr) PaO2 (torr) PAP (mmHg) CO (ml/min) PVR (dyne-sec/cm5) 5 26±7 206±19 16±6 610±140 2411 ±1426 5+CO2 46±9*191 ±33 20±8 *575±183 3581±3105 12 49±10 *166±24*20±8*584±159 3315±2483 (Mean ± SD,*p<0.005 vs 5Hz).

Original languageEnglish (US)
JournalCritical Care Medicine
Volume27
Issue number12 SUPPL.
StatePublished - 1999
Externally publishedYes

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High-Frequency Ventilation
Tidal Volume
Cardiac Output
Pulmonary Artery
Animal Models
Hemodynamics
Pressure
Vascular Resistance
Catheters
Vascular Access Devices
Mechanical Ventilators
Analysis of Variance
Swine
Gases
Weights and Measures
Datasets

ASJC Scopus subject areas

  • Critical Care and Intensive Care Medicine

Cite this

Gentile, M. A., Craig, D. S., Quick, G. C., Davis, J., Cheifetz, I. M., & Meliones, J. N. (1999). Frequency adjustment does not effect hemodynamics during high frequency oscillatory ventilation in an animal model. Critical Care Medicine, 27(12 SUPPL.).

Frequency adjustment does not effect hemodynamics during high frequency oscillatory ventilation in an animal model. / Gentile, Michael A.; Craig, Damian S.; Quick, George C.; Davis, Jay; Cheifetz, Ira M.; Meliones, Jon N.

In: Critical Care Medicine, Vol. 27, No. 12 SUPPL., 1999.

Research output: Contribution to journalArticle

Gentile, MA, Craig, DS, Quick, GC, Davis, J, Cheifetz, IM & Meliones, JN 1999, 'Frequency adjustment does not effect hemodynamics during high frequency oscillatory ventilation in an animal model', Critical Care Medicine, vol. 27, no. 12 SUPPL..
Gentile, Michael A. ; Craig, Damian S. ; Quick, George C. ; Davis, Jay ; Cheifetz, Ira M. ; Meliones, Jon N. / Frequency adjustment does not effect hemodynamics during high frequency oscillatory ventilation in an animal model. In: Critical Care Medicine. 1999 ; Vol. 27, No. 12 SUPPL.
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AU - Meliones, Jon N.

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