{"title":"Comparison of inhaled salbutamol and salmeterol for the treatment of arterial hypoxaemia in anaesthetized horses: a randomized clinical trial","authors":"","doi":"10.1016/j.vaa.2024.05.009","DOIUrl":null,"url":null,"abstract":"<div><h3>Objective</h3><p>To compare the efficacy of inhaled salbutamol with salmeterol for the treatment of arterial hypoxaemia in anaesthetized horses.</p></div><div><h3>Study design</h3><p>Prospective, randomized, clinical study.</p></div><div><h3>Animals</h3><p>A total of 108 client-owned horses (American Society of Anesthesiologists status I–V) anaesthetized for elective and emergency procedures.</p></div><div><h3>Methods</h3><p>Horses were premedicated with acepromazine [intramuscularly 0.1 mg kg<sup>–1</sup> or intravenously (IV) 0.05 mg kg<sup>–1</sup>] and xylazine (0.6 mg kg<sup>–1</sup> IV). Midazolam (0.06 mg kg<sup>–1</sup> IV) and ketamine (2.2 mg kg<sup>–1</sup> IV) were combined to induce anaesthesia, and isoflurane in oxygen/air mixture (inspired oxygen fraction 0.7) was used for maintenance of anaesthesia. Mechanical ventilation was initiated without delay using the following ventilator settings: tidal volume 10 mL kg<sup>–1</sup>, respiratory rate 8 breaths minute<sup>–1</sup>, inspiratory-to-expiratory time ratio 1:2, no positive end-expiratory pressure. If arterial blood gas analysis revealed PaO<sub>2</sub> < 100 mmHg (13.3 kPa), the administration of either inhaled salbutamol (2 μg kg<sup>–1</sup>) or salmeterol (0.5 μg kg<sup>–1</sup>) was randomly assigned Blood gas analysis was repeated 15 and 30 minutes after treatment. The intervention was considered successful when PaO<sub>2</sub> after treatment ≥ 1.2 × PaO<sub>2</sub> before treatment (i.e. ≥20% increase). PaO<sub>2</sub> at 15 and 30 minutes was compared between groups using Mann–Whitney <em>U</em> test; <em>p</em> < 0.05 was considered significant.</p></div><div><h3>Results</h3><p>Of the 108 horses, 60 were administered salbutamol, 65% and 60% responded successfully at 15 and 30 minutes, increasing their initial PaO<sub>2</sub> by 38% and 44%, respectively. The other 48 horses were administered salmeterol, 35% responded successfully at 15 and 30 minutes, increasing their initial PaO<sub>2</sub> by 3% and 4%, respectively. PaO<sub>2</sub> was significantly higher after salbutamol than after salmeterol at 15 and 30 minutes.</p></div><div><h3>Conclusions and clinical relevance</h3><p>Using the described protocol, inhaled salbutamol was more effective than salmeterol in improving PaO<sub>2</sub> in anaesthetized horses with value < 100 mmHg (13.3 kPa).</p></div>","PeriodicalId":23626,"journal":{"name":"Veterinary anaesthesia and analgesia","volume":null,"pages":null},"PeriodicalIF":1.4000,"publicationDate":"2024-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Veterinary anaesthesia and analgesia","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1467298724000862","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"VETERINARY SCIENCES","Score":null,"Total":0}
引用次数: 0
Abstract
Objective
To compare the efficacy of inhaled salbutamol with salmeterol for the treatment of arterial hypoxaemia in anaesthetized horses.
Study design
Prospective, randomized, clinical study.
Animals
A total of 108 client-owned horses (American Society of Anesthesiologists status I–V) anaesthetized for elective and emergency procedures.
Methods
Horses were premedicated with acepromazine [intramuscularly 0.1 mg kg–1 or intravenously (IV) 0.05 mg kg–1] and xylazine (0.6 mg kg–1 IV). Midazolam (0.06 mg kg–1 IV) and ketamine (2.2 mg kg–1 IV) were combined to induce anaesthesia, and isoflurane in oxygen/air mixture (inspired oxygen fraction 0.7) was used for maintenance of anaesthesia. Mechanical ventilation was initiated without delay using the following ventilator settings: tidal volume 10 mL kg–1, respiratory rate 8 breaths minute–1, inspiratory-to-expiratory time ratio 1:2, no positive end-expiratory pressure. If arterial blood gas analysis revealed PaO2 < 100 mmHg (13.3 kPa), the administration of either inhaled salbutamol (2 μg kg–1) or salmeterol (0.5 μg kg–1) was randomly assigned Blood gas analysis was repeated 15 and 30 minutes after treatment. The intervention was considered successful when PaO2 after treatment ≥ 1.2 × PaO2 before treatment (i.e. ≥20% increase). PaO2 at 15 and 30 minutes was compared between groups using Mann–Whitney U test; p < 0.05 was considered significant.
Results
Of the 108 horses, 60 were administered salbutamol, 65% and 60% responded successfully at 15 and 30 minutes, increasing their initial PaO2 by 38% and 44%, respectively. The other 48 horses were administered salmeterol, 35% responded successfully at 15 and 30 minutes, increasing their initial PaO2 by 3% and 4%, respectively. PaO2 was significantly higher after salbutamol than after salmeterol at 15 and 30 minutes.
Conclusions and clinical relevance
Using the described protocol, inhaled salbutamol was more effective than salmeterol in improving PaO2 in anaesthetized horses with value < 100 mmHg (13.3 kPa).
期刊介绍:
Veterinary Anaesthesia and Analgesia is the official journal of the Association of Veterinary Anaesthetists, the American College of Veterinary Anesthesia and Analgesia and the European College of Veterinary Anaesthesia and Analgesia. Its purpose is the publication of original, peer reviewed articles covering all branches of anaesthesia and the relief of pain in animals. Articles concerned with the following subjects related to anaesthesia and analgesia are also welcome:
the basic sciences;
pathophysiology of disease as it relates to anaesthetic management
equipment
intensive care
chemical restraint of animals including laboratory animals, wildlife and exotic animals
welfare issues associated with pain and distress
education in veterinary anaesthesia and analgesia.
Review articles, special articles, and historical notes will also be published, along with editorials, case reports in the form of letters to the editor, and book reviews. There is also an active correspondence section.