A. Baraka et al., CAN PULSE OXIMETRY AND END-TIDAL CAPNOGRAPHY REFLECT ARTERIAL OXYGENATION AND CARBON-DIOXIDE ELIMINATION DURING LAPAROSCOPIC CHOLECYSTECTOMY, Surgical laparoscopy & endoscopy, 4(5), 1994, pp. 353-356
An investigation was carried out on 13 ASA class 1 or 2 adult patients
undergoing laparoscopic cholecystectomy. Throughout laparoscopy, the
end-tidal PCO2 was continuously monitored by capnography and the arter
ial hemoglobin oxygen saturation by pulse oximetry. Also, repeated mea
surements of arterial blood gases were done. Ventilation was controlle
d using an inspired oxygen concentration of 33% and tidal volume of 10
to 15 ml/kg at a rate of 10-14/min. The report showed that both the m
ean end-tidal PCO2 and arterial PCO2 progressively increased following
carbon dioxide insufflation, to reach a maximal value after 30 min, w
ith no significant change in the arterial-alveolar PCO2 gradient. Also
, the arterial PO2 significantly decreased, and the hemoglobin oxygen
saturation was always above 98% whether monitored by arterial blood ga
s analysis or by pulse oximetry. The results suggest that end-tidal ca
pnography and pulse oximetry can be used as noninvasive techniques for
monitoring arterial oxygenation and carbon dioxide elimination during
laparoscopic cholecystectomy.