[The concentration of carbon dioxide at the end of expiration as an index of hemodynamic status in open-heart operations].

The interrelationship of the cardiac index (CI) and carbon dioxide concentration measured at the end of respiration (CO2ER) was studied in 258 patients, aged from 5 to 71 years, during operations on the open heart. Statistical analysis of the stage of revision of the left ventricular posterior wall showed that CO2ER decreases from 29.9 +/- 0.

[Different methods of determining the position on the oxyhemoglobin dissociation curve].

P50 values, as measured on DCA-1 analyzer and calculated according to Lichtman formula based on Hill equation, or calculated according to standard Severinghaus curve have been compared. No significant differences in P50 values have been observed. The method of direct oxyhemoglobin dissociation curve registration seems preferable, as it gives the idea not only of the position, but also of the form of curve changes.