Effect of acetate upon arterial gases

Area of Science:

• Nephrology
• Physiology
• Biochemistry

Background:

• Hemodialysis is a life-sustaining treatment for kidney failure.
• Hypoxemia, a dangerous drop in blood oxygen, can occur during hemodialysis.
• The exact causes of hemodialysis-induced hypoxemia are not fully understood.

Purpose of the Study:

• To investigate the effects of acetate and bicarbonate infusions on arterial oxygen tension (PO2).
• To determine if acetate ions play a role in hemodialysis-induced hypoxemia.

Main Methods:

• Infusion of sodium acetate into subjects.
• Infusion of sodium bicarbonate into subjects.
• Monitoring of arterial oxygen tension (PO2), PCO2, bicarbonate, and pH levels.

Main Results:

• Sodium acetate infusion caused a significant decrease in PO2 (p < 0.001).
• Sodium acetate also led to significant increases in PCO2 and bicarbonate, with unchanged pH.
• Sodium bicarbonate infusion increased PCO2, bicarbonate, and pH, but did not significantly affect PO2.

Conclusions:

• Acetate ions appear to be responsible for the observed fall in arterial oxygen tension.
• Acetate, not bicarbonate, may be a key factor in hemodialysis-induced hypoxemia.