Decrease in serum potassium concentration during epidural anaesthesia.
A mean decrease in the arterial serum potassium concentration (S-K) of 0.40 mmol/l (range 0-1.0) was found in 45 elderly men who were studied before and after induction of epidural anaesthesia (using mepivacaine 2% with adrenaline). The decrease was similar in patients who received acetated Ringer solution or dextran 40 in normal saline as intravenous fluid supplementation. No difference in S-K change was found between patients with a normal (less than 115 mumol/l) or elevated serum creatinine concentration. The decrease in S-K prevailed at the end of surgery except in patients with an elevated serum creatinine. Corrections of S-K for changes in arterial blood pH and rectal temperature during induction of anaesthesia did not explain the decrease in S-K. Correlations of clinical parameters such as the extension of anaesthesia, amount of intravenous fluid given and blood pressure changes gave conflicting results. A smaller decrease or no change in S-K was usually seen in arterial (n = 7) and venous (n = 7) samples when no intravenous fluid was given, as well as in venous samples when acetated Ringer solution was given (n = 6).
Hahn
R G
RG
Department of Anaesthesiology, Huddinge University Hospital, Sweden.
D000368:Aged; D000369:Aged, 80 and over; D000767:Anesthesia, Epidural / Q000009:adverse effects*; D001786:Blood Glucose / Q000378:metabolism; D001831:Body Temperature; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007008:Hypokalemia / Q000209:etiology*; D007328:Insulin / Q000097:blood; D008297:Male; D008619:Mepivacaine; D008875:Middle Aged; D011468:Prostatectomy; D012964:Sodium / Q000097:blood
D001786:Blood Glucose; D007328:Insulin; D012964:Sodium; D008619:Mepivacaine