To compare the effects of hypertonic solution, we examined the effect on hemodynamic and circulating blood volume (CBV) after administering a hypertonic saline solution or a hypertonic oncotic saline solution in anesthetized dogs. Anesthetized dogs were given with either a single bolus injection, 4ml·kg
-1, of a hypertonic saline solution (HS; 7.5% NaCl) or a hypertonic saline hydroxyethyl starch solution (HH; 6% hydroxyethyl starch 200 in 7.5% NaCI; MW=200 kDa) . Measurements were taken at baseline, 5, 15, 30, 60 and 120 minutes after the bolus injection. After bolus injection of either regimen, mean pulmonary arterial pressure (mPAP), cardiac index (CI), left ventricular stroke work index (LVSWI), maximum rate of the left ventricular pressure change (LV dp/dt max), plasma crystalloidal osmotic pressure (Posm), and CBV values in both groups increased significantly. Plasma colloidal osmotic pressure (Pcop) in animals given HS decreased significantly as compared with the baseline condition. On the other hand, Pcop in animals given HH did not differ significantly. CI, LVSWI, LV dp/dt max, Pcop and CBV in animals given HH were significantly greater than those in animal given HS. Posm did not differ significantly between animals received HS and those received HH.
These result suggests that hemodynamic variables, Pcop and CBV are better maintained and more stable with hypertonic oncotic saline solution rather than hypertonic saline solution.
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