The Effect of Mild Hypocapnia on Postoperative Ecchymosis in Rhinoplasty.

[PURPOSE] Ecchymosis and edema are the most common complications in patients following rhinoplasty in the early postoperative period. Vasoconstriction created by hypocarbia may have a positive effect on postoperative ecchymosis. The aim of this study was to evaluate the effect of mild hypocapnia induced in rhinoplasty on the severity of periorbital ecchymosis.

[METHODS] The study was carried out retrospectively in the digital photographs (control group and study group) of 31 participants who underwent open technical rhinoplasty between January and March 2019. During the operation, partial carbon dioxide pressure in the study group was kept in the range of 32 to 38 mmHg and in the control group between 42 and 46 mmHg and this was confirmed by arterial blood gas measurements taken during the operation. Measuring the brightness and shadows of digital photos Digital color meter was used in MacOS X as a computer software.

[RESULTS] The mean ratio of periorbital ecchymosis to forehead brightness was 0.84 ± 0.05 in the study group and 0.81 ± 0.03 in the control group. There was no significant difference between the study and control groups ( > .05).

[CONCLUSION] This study investigates the potential role of hypocapnia on postoperative ecchymosis during rhinoplasty. The severity of ecchymosis was less in the patients with induced mild hypocapnia regarding both subjective and objective evaluations, but this difference didn't reach statistical significance compared to the normocapnic control group.