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Acid-base alterations during laparoscopic abdominal surgery: a comparison with laparotomy
1Department of Anaesthesiology and Pain Medicine, Gachon University of Medicine and Science, Gil Medical Center, Incheon, Republic of Korea.
British Journal of Anaesthesia
|July 24, 2010
Summary
Pneumoperitoneum during laparoscopic surgery causes a temporary acid-base imbalance due to increased carbon dioxide. Laparotomy leads to a more persistent metabolic imbalance affecting acid-base status.
Area of Science:
- Physiology
- Surgical Anesthesia
Background:
- Laparoscopic surgery utilizes carbon dioxide insufflation, potentially disrupting patient acid-base balance.
- Understanding these acid-base shifts is crucial for patient safety during abdominal procedures.
Purpose of the Study:
- To investigate the impact of pneumoperitoneum on acid-base status.
- To compare acid-base changes between laparoscopic and open abdominal surgery using Stewart's approach.
Main Methods:
- Thirty patients were divided into laparoscopy (n=15) and laparotomy (n=15) groups.
- Acid-base parameters were measured at four time points: baseline, during surgery, end of surgery, and 1 hour post-surgery.
Main Results:
- No significant differences in standard base excess (SBE), strong ion gap, or anion gap between groups.
- Both groups showed decreased SBE during surgery. Laparotomy group exhibited decreased pH and apparent strong ion difference (SIDa) with increased lactate and chloride post-surgery.
- Laparoscopy group showed decreased pH with increased Pa(CO2) during pneumoperitoneum, resolving post-desufflation.
Conclusions:
- Pneumoperitoneum-induced pH decrease is primarily due to elevated Pa(CO2), which normalizes after surgery.
- Laparotomy-associated pH decrease stems from metabolic factors persisting post-operatively.
