Treatment of low arterial oxygen tension in anesthetized horses with clenbuterol.

The research article examines the effectiveness and safety of using Clenbuterol, a bronchodilator, to treat low arterial oxygen tension (PaO2) in anesthetized horses. The study finds that Clenbuterol does raise PaO2 levels in such conditions and suggests further studies to understand its safe use better.

Background and Purpose

• The primary objective of this study was to determine the effectiveness of Clenbuterol in treating low arterial oxygen tension in anesthetized horses. Low arterial oxygen tension refers to abnormally low levels of oxygen in the blood, a condition that can be severe during anesthesia. Clenbuterol, a bronchodilator drug, is considered as a potential treatment option due to its ability to relax muscles in the lungs and expand airways, leading to increased oxygen flow.

Study Methods and Participants

• The study involved 20 anesthetized horses, ten of which were administered with Clenbuterol intravenously. The dosage provided was 0.8 micrograms/kg.
• The remaining ten horses served as the control group; conventional methods continued to increase their PaO2, and no Clenbuterol was given.
• All horses in the study had a PaO2 of less than 90 mm Hg despite being ventilated with an oxygen-rich gas mixture.

Results and Findings

• The horses treated with Clenbuterol showed higher PaO2 levels for at least 90 minutes compared to the control group. This finding indicates the potential efficacy of Clenbuterol in treating low arterial oxygen tension effectively.
• However, the administration of Clenbuterol was associated with increased heart rate and profuse sweating in the horses. These signs could be potential side effects of the drug, suggesting caution in its usage.

Conclusion and Further Studies

• The results suggest the potential effectiveness of Clenbuterol in treating anesthetized horses experiencing low arterial oxygen tension. The drug can be administered intravenously to increase PaO2 of mechanically ventilated horses under inhalation anesthesia.
• However, the study also notes the need for further studies to identify precisely the circumstances concerning the safe use of Clenbuterol. The observed side effects underline this need.