Bronchoalveolar lavage fluid findings in the atelectatic regions of anesthetized horses.

The study aimed to understand the impact of compression atelectasis, a condition that can occur during anesthesia, on lung secretions in horses. The study found evidence suggesting that the kerbs of compression atelectasis might disappear within 168 hours after anesthesia.

Study Objectives and Procedures

• The main objective of this study was to evaluate the effects of compression atelectasis, which is a type of lung collapse that can occur during or after anesthesia, on the composition of pulmonary secretions in horses.
• The researchers conducted cytological and biochemical examinations on bronchoalveolar lavage (BAL) fluids.
• The BAL fluids were obtained from both the dependent and independent lung areas of each horse.
• The study involved six horses that were anesthetized using isoflurane combined with oxygen for 120 minutes. They were then positioned in right lateral recumbency, which is a body position in which the horse lays on its right side.

Key Findings

• The key findings of the study revolve around the changes in the composition of the BAL fluid after the horses had been anesthetized.
• At the end of the anesthesia, the percentage of neutrophils and the total protein concentration in the BAL fluids had significantly increased in the dependent part of the lung.
• Conversely, the total phosphorus concentration in the BAL fluids had significantly decreased at 72 hours after the anesthesia.
• However, these changes did not persist – the researcher observed no such changes at 168 hours (or 7 days) after the anesthesia.

Implications of the Study

• This research indicates that the effects of compression atelectasis on the composition of pulmonary secretions in horses might be reversible with the passage of time.
• The effects observed immediately after anesthesia did not persist beyond a week, suggesting that the lung health and function may restore to their normal state within this period.