Effects of hypertonic saline (7.5%) on extracellular fluid volumes compared with normal saline (0.9%) and 6% hydroxyethyl starch after aortocoronary bypass graft surgery.
OBJECTIVE
To compare the effects of hypertonic (7.5%) saline (HS), normal (0.9%) saline (NS), and 6% hydroxyethyl starch (HES) on extracellular fluid volumes in the early postoperative period after cardiopulmonary bypass.


METHODS
A prospective, randomized, double-blind study.


METHODS
University teaching hospital.


METHODS
Forty-eight patients scheduled for elective coronary artery bypass graft surgery.


METHODS
Patients were randomly allocated to receive 4 mL/kg of HS, NS, or HES during 30 minutes when volume loading was needed during the postoperative rewarming period in the intensive care unit. Plasma volume was measured using a dilution of iodine-125-labeled human serum albumin. Extracellular water and cardiac output were measured by whole-body impedance cardiography.


RESULTS
Plasma volume had increased by 19 +/- 7% in the HS group and by 10 +/- 3% in the NS group (p = 0.001) at the end of the study fluid infusion. After 1-hour follow-up time, the plasma volume increase was greatest (23 +/- 8%) in the group receiving HES (p < 0.001). The increase of extracellular water was greater than the infused volume in the HS and HES groups at the end of the infusion. One-hour diuresis after the study infusion was greater in the HS group (536 +/- 280 mL) than in the NS (267 +/- 154 mL, p = 0.006) and HES groups (311 +/- 238 mL, p = 0.025).


CONCLUSIONS
The effect of HS on plasma volume was short-lasting, but it stimulated excretion of excess body fluid accumulated during cardiopulmonary bypass and cardiac surgery. HS may be used in situations in which excess free water administration is to be avoided but the intravascular volume needs correction.
Järvelä
K
K
Department of Anaesthesia, Tampere University Hospital, Tampere, Finland.
Koskinen
M
M
Kaukinen
S
S
Kööbi
T
T
D000368:Aged; D000758:Anesthesia; D001026:Coronary Artery Bypass; D004311:Double-Blind Method; D005110:Extracellular Space / Q000187:drug effects / Q000378:metabolism*; D005260:Female; D006400:Hematocrit; D006439:Hemodynamics / Q000187:drug effects; D006801:Humans; D006895:Hydroxyethyl Starch Derivatives / Q000627:therapeutic use*; D006982:Hypertonic Solutions / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D010952:Plasma Substitutes / Q000627:therapeutic use*; D010953:Plasma Volume / Q000187:drug effects / Q000502:physiology; D012965:Sodium Chloride / Q000627:therapeutic use*
D006895:Hydroxyethyl Starch Derivatives; D006982:Hypertonic Solutions; D010952:Plasma Substitutes; D012965:Sodium Chloride