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KMID : 0356920120630050419
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Korean Journal of Anesthesiology
2012 Volume.63 No. 5 p.419 ~ p.424
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Effects of pneumoperitoneal pressure and position changes on respiratory mechanics during laparoscopic colectomy
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Park Jin-Suk
Ahn Eun-Jin
Ko Duk-Dong
Kang Hyun
Shin Hwa-Yong
Baek Chong-Hwa
Jung Yong-Hun
Woo Young-Cheol
Kim Jin-Yun
Koo Gill-Hoi
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Abstract
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Background: This study was designed to assess the effects of pneumoperitoneal pressure (PP) and positional changes on the respiratory mechanics during laparoscopy assisted colectomy.
Methods: Peak inspiratory pressure, plateau pressure, lung compliance, and airway resistance were recorded in PP of 10 mmHg and 15 mmHg, with the position change in 5 steps: head-down at 20°, head-down at 10°, neutral position, head-up at 10° and head-up at 20°.
Results: When the patient was placed head-down, the position change accentuated the effects of pneumoperitoneum on respiratory mechanics. However, when the patient was placed in a head-up position during pneumoperitoneum the results showed no pattern. In the 20° head-up position with the PP being 10 mmHg, the compliance increased from 30.6 to 32.6 ml/cmH2O compared with neutral position (P = 0.002). However with the PP being 15 mmHg, the compliance had not changed compared with neutral position (P = 0.989). In 20° head-down position with the PP of 10 mmHg, the compliance was measured as 24.2 ml/cmH2O. This was higher than that for patients in the 10° head-down position with a PP of 15 mmHg, which was recorded as 21.2 ml/cmH2O. Also in the airway resistance, the patient in the 20° head-down position with the PP of 10 mmHg showed 15.8 cmH2O/L/sec, while the patient in the 10° head-down position with the PP of 15 mmHg showed 16.2 cmH2O/L/sec of airway resistance. These results were not statistically significant but still suggested that the head-down position accentuated the effects of pneumoperitoneum on respiratory mechanics.
Conclusions: Our results suggest that respiratory mechanics are affected by the patient position and the level of PP - the latter having greater effect.
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KEYWORD
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Laparocolectomy, Pneumoperitoneum, Position, Respiratory mechanics
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