Related Experiment Videos
[Intraoperative monitoring of gastric intramucosal pH]
M Concha1, R Añazco, A González
1Departamento de Anestesiología, Hospital Clínico, Universidad Católica de Chile, Santiago de Chile.
Background:
Gastric mucosal pH may be a good indicator of splanchnic tissue oxygenation.
Aim:
To study the effects of abdominal surgical procedures on gastric mucosal pH.
Patients And Methods:
Eighteen patients subjected to abdominal surgery were studied. All patients received general anesthesia and hemodynamic parameters were maintained within 20% of basal values. A tonometer was placed in the stomach after induction of anesthesia. Arterial blood gases and samples from the tonometer were obtained 30 minutes after induction and at 2 hours of surgery. Intramucosal pH was calculated using Henderson-Haselbach equations.
Results:
Basal gastric mucosal pH was 7.4 +/- 0.1 and did not change during surgery. Two patients had a pH persistently below 7.35 without hemodynamic alterations or systemic acidosis.
Conclusions:
Gastric mucosal pH is not modified by abdominal surgery and some patients have low values despite the absence of hemodynamic derangement.