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Flat electroencephalogram caused by carbon dioxide pneumoperitoneum.

Hitoshi Yoshida1, Tetsuya Kushikata, Shizuko Kabara

  • 1Department of Anesthesiology, University of Hirosaki School of Medicine, Hirosaki, Japan. hyoshida@cc.hirosaki-u.ac.jp

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Severe hypercapnia during laparoscopic surgery can cause electroencephalogram (EEG) depression in patients with chronic pulmonary emphysema. This case highlights the importance of monitoring ventilation and EEG during CO2 insufflation.

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Area of Science:

  • Anesthesiology
  • Neurosurgery
  • Pulmonology

Background:

  • Carbon dioxide (CO2) insufflation during laparoscopic surgery can lead to hypercapnia, especially in patients with compromised pulmonary function.
  • Hypercapnia, or elevated CO2 levels, poses risks including central nervous system depression.
  • Laparoscopic ureteronephrectomy involves insufflation of both intraperitoneal and retroperitoneal spaces, potentially increasing CO2 absorption.

Observation:

  • A 77-year-old patient with chronic pulmonary emphysema undergoing laparoscopic ureteronephrectomy experienced sudden electroencephalogram (EEG) depression.
  • The patient developed subcutaneous emphysema and ventilation difficulties during CO2 insufflation.
  • Severe hypercapnia was recorded (pH 6.94, PaCO2 137 mm Hg), correlating with a markedly depressed EEG (minimum Bispectral Index of 4).

Findings:

  • Severe hypercapnia during laparoscopic surgery can induce significant electroencephalogram (EEG) depression.
  • The observed EEG changes were accompanied by increased blood pressure and heart rate.
  • Discontinuation of the laparoscopic procedure led to improvement in ventilation, EEG, and hemodynamic parameters.

Implications:

  • This case underscores the potential for severe hypercapnia to cause neurological abnormalities during laparoscopic procedures.
  • The findings suggest that CO2 itself may have narcotic properties or that hypercapnia induces neurological dysfunction.
  • Close monitoring of ventilation and neurological status is crucial in patients with pulmonary compromise undergoing laparoscopic surgery with CO2 insufflation.