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- Title
Determination of Plasma Osmolality and Agreement between Measured and Calculated Values in Captive Male Corn Snakes (Pantherophis [Elaphe] guttatus guttatus).
- Authors
Sanchez-Migallon Guzman, David; Mitchell, Mark A.; Acierno, Mark
- Abstract
Twelve adult male corn snakes, Pantherophis (Elaphe) guttatus guttatus, were used for this study. Blood samples were collected via cardiocentesis or caudal tail venipuncture. Plasma chemistries were measured using a standard laboratory chemistry analyzer; these parameters were used to calculate plasma osmolality. Osmolality also was measured using a freezing point osmometer. The osmolality measured with the osmometer in the corn snakes ranged from 304.5 to 373.0 mOsmlkg, with a mean value of 344.5 mOsm/kg. These values are higher than the osmolality of Ringer's solution (310 mOsm/L), lactated Ringer's solution (272 mOsm/L), Plasma-Lyte A® (294 mOsm/L), and Normosol R® (295 mOsm/L) and should be taken into account when replenishing fluids to avoid large shifts in plasma osmolality. Bland Altman plots were used to assess the level of agreement between the measured and calculated osmolalitites. The results of the comparisons showed the highest level of agreement between the measured and calculated osmolality when using the following formula: (2 x [Na+ + K+]) + (glucose concentration/18). Two other formulas, 2 x (Na+ + K+) and 2 x [Na+ + K+] + (glucose concentration/18) + (uric acidl/6.8), likewise showed good agreement with the measured osmolality. One formula, 2 x Na+, showed a fair level of agreement with the measured osmo- lality. Additional studies are needed in snakes to investigate fluid replacement using commercially available crystalloid fluids, develop appropriate isotonic fluids, and evaluate osmolality as changes in hydration status occur in healthy and unhealthy animals.
- Subjects
RAT snakes; PLASMA chemistry; PHYSIOLOGIC salines; ANIMAL health; VENOUS puncture; OSMOMETERS
- Publication
Journal of Herpetological Medicine & Surgery, 2011, Vol 21, Issue 1, p16
- ISSN
1529-9651
- Publication type
Article
- DOI
10.5818/1529-9651-21.1.16