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Non-invasive determination of alveolar pressure during mechanical ventilation

T Nicolai, C Lanteri, N Freezer, PD Sly
European Respiratory Journal 1991 4: 1275-1283; DOI: 10.1183/09031936.93.04101275
T Nicolai
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C Lanteri
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N Freezer
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PD Sly
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Abstract

The development of inadvertent positive end-expiratory pressure (PEEPi) in ventilated infants is of clinical relevance and difficult to measure non-invasively. A method for estimating end-expiratory alveolar pressure by applying a multiple regression analysis to airway opening pressure, flow and volume recordings during mechanical ventilation was evaluated. In eight open-chested, paralysed and mechanically ventilated mongrel dogs, alveolar pressure was measured directly with "alveolar capsules". Alteration of ventilation patterns and addition of a resistive element were used in three dogs to induce different levels of PEEPi. End-expiratory alveolar pressure measured directly and determined from multilinear regression of airway opening pressure correlated well (mean error 0.06 +/- 0.53 (+/- SD) hPa, limits of agreement -1.16 to +1.04 hPa). The other five dogs received inhalation challenges, two with histamine, two with hypertonic saline and one with methacholine resulting in a mean increase of respiratory system resistance of 230% (range 141-489%) of the baseline values. The mean error in determining PEEPi was 0.54 +/- 0.37 hPa, the limits of agreement were -0.20 to 1.28 hPa. The method was then applied to seven mechanically-ventilated children (aged 2 months to 8 yrs, weight 4.9-23.5 kg) and the results were compared to the pressure at which inspiration began (equalling PEEPi). Seventy eight measurements were performed during open heart surgery, while compliance changed by between 3 and 186% of baseline values due to the surgical procedures. PEEPi estimated by multiple regression agreed well with the pressure at which inspiration began (mean difference 0.25 +/- 0.68 hPa, limits of agreement -1.12 to 1.62 hPa).(ABSTRACT TRUNCATED AT 250 WORDS)

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Non-invasive determination of alveolar pressure during mechanical ventilation
T Nicolai, C Lanteri, N Freezer, PD Sly
European Respiratory Journal Nov 1991, 4 (10) 1275-1283; DOI: 10.1183/09031936.93.04101275

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Non-invasive determination of alveolar pressure during mechanical ventilation
T Nicolai, C Lanteri, N Freezer, PD Sly
European Respiratory Journal Nov 1991, 4 (10) 1275-1283; DOI: 10.1183/09031936.93.04101275
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