Respiratory variation of intra-abdominal pressure: indirect indicator of abdominal compliance?
Evelina Sturini, Andrea Saporito, Michael Sugrue, Michael J. A. Parr, Gillian Bishop, Antonio Braschi
Original
Volume 34,
Issue
9
/
September ,
2008
Pages 1632 - 1637
Abstract
Objective
To assess if the observed respiratory cycle-related variation in intra-abdominal pressure is reliably quantifiable and a possible indirect indicator of abdominal compliance. Secondary issues were to assess the roles played by respiratory parameters in determining this oscillation and by patients’ position in increasing their intra-abdominal pressure.
Design and setting
Prospective observational study in a 26-bed medical-surgical intensive care unit.
Patients
Sixteen consecutive patients admitted to intensive care for at least 24 h, requiring mechanical ventilation and intra-abdominal pressure monitoring.
Measurements and results
Intra-abdominal pressure was measured with a modified Kron technique; its waveform was recorded and inspiratory and expiratory values were measured during five consecutive respiratory cycles for 5 days, both in the supine and the 30° head-up position. Inspiratory values were significantly higher than expiratory values (p = 0.001) and a correlation was found between their difference and intra-abdominal pressure basal values (p = 0.025). A positive linear relationship was shown between intra-abdominal pressure and the amplitude of its oscillation (r = 0.4), particularly in the subgroup of patients with intra-abdominal hypertension (r = 0.9). Intra-abdominal pressure was lower in patients supine than in the 30° head-up position (p = 0.001).
Conclusions
Respiratory cycle-related variations in intra-abdominal pressure were specifically investigated, quantified and shown as linearly increasing with end-expiratory intra-abdominal pressure; this phenomenon could be explained by patients’ abdominal compliance status. Supine posture should be an important consideration in specific patients affected by intra-abdominal hypertension.
Keywords
References
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