Modeling intra-abdominal volume and respiratory driving pressure during pneumoperitoneum insufflation-a patient-level data meta-analysis

During pneumoperitoneum, intra-abdominal pressure (IAP) is usually kept at 12-14 mmHg. There is no clinical benefit in IAP increments if they do not increase intra-abdominal volume IAV. We aimed to estimate IAV (ΔIAV) and respiratory driving pressure changes (Δ ) in relation to changes in IAP (ΔIAP)...

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Published in:Journal of applied physiology (1985) 2021-03, Vol.130 (3), p.721-728
Main Authors: Mazzinari, Guido, Diaz-Cambronero, Oscar, Serpa Neto, Ary, Martínez, Antonio Cañada, Rovira, Lucas, Argente Navarro, María Pilar, Malbrain, Manu L N G, Pelosi, Paolo, Gama de Abreu, Marcelo, Hollmann, Markus W, Schultz, Marcus J
Format: Article
Language:English
Subjects:
Abdomen
Anesthesia
Bayesian analysis
Clinical trials
Laparoscopy
Mathematical functions
Meta-analysis
Patients
Pressure
Regression analysis
Surgery
Thorax
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Summary:During pneumoperitoneum, intra-abdominal pressure (IAP) is usually kept at 12-14 mmHg. There is no clinical benefit in IAP increments if they do not increase intra-abdominal volume IAV. We aimed to estimate IAV (ΔIAV) and respiratory driving pressure changes (Δ ) in relation to changes in IAP (ΔIAP). We carried out a patient-level meta-analysis of 204 adult patients with available data on IAV and Δ during pneumoperitoneum from three trials assessing the effect of IAP on postoperative recovery and airway pressure during laparoscopic surgery under general anesthesia. The primary endpoint was ΔIAV, and the secondary endpoint was Δ . The endpoints' response to ΔIAP was modeled using mixed multivariable Bayesian regression to estimate which mathematical function best fitted it. IAP values on the pressure-volume (PV) curve where the endpoint rate of change according to IAP decreased were identified. Abdomino-thoracic transmission (ATT) rate, that is, the rate Δ change to ΔIAP was also estimated. The best-fitting function was sigmoid logistic and linear for IAV and Δ response, respectively. Increments in IAV reached a plateau at 6.0 [95%CI 5.9-6.2] L. ΔIAV for each ΔIAP decreased at IAP ranging from 9.8 [95%CI 9.7-9.9] to 12.2 [12.0-12.3] mmHg. ATT rate was 0.65 [95%CI 0.62-0.68]. One mmHg of IAP raised Δ 0.88 cmH O. During pneumoperitoneum, IAP has a nonlinear relationship with IAV and a linear one with Δ . IAP should be set below the point where IAV gains diminish. We found that intra-abdominal volume changes related to intra-abdominal pressure increase reached a plateau with diminishing gains in commonly used pneumoperitoneum pressure ranges. We also found a linear relationship between intra-abdominal pressure and respiratory driving pressure, a known marker of postoperative pulmonary complications.
ISSN:8750-7587
1522-1601
DOI:10.1152/JAPPLPHYSIOL.00814.2020