Comparison of respiratory function during TIVA and isoflurane anaesthesia in ponies Part II: breathing patterns and transdiaphragmatic pressure |
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Authors: | Stijn Schauvliege Johannes Peter Schramel Kiriaki Pavlidou Ioannis Savvas Luc Duchateau Frank Gasthuys Yves Moens |
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Affiliation: | 1. Department of Surgery and Anaesthesia of Domestic Animals, Faculty of Veterinary Medicine, University of Ghent, , Merelbeke, Belgium;2. Anaesthesiology and Perioperative Intensive‐Care, Vetmeduni Vienna, , Vienna, Austria;3. Companion Animal Clinic, Department of Clinical Sciences, Faculty of Veterinary Medicine, Aristotle University of Thessaloniki, , Thessaloniki, Greece;4. Department of Physiology and Biometrics, Faculty of Veterinary Medicine, University of Ghent, , Merelbeke, Belgium |
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Abstract: | ObjectiveTo compare breathing patterns and transdiaphragmatic pressure during total intravenous (TIVA) and isoflurane anaesthesia in ponies.Study designExperimental, cross–over study.AnimalsSix healthy ponies weighing 286 (233–388) ± 61 kg, age 13 (9–16) ± 3 years.MethodsFollowing premedication with romifidine [80 μg kg?1 intravenously (IV)], general anaesthesia was induced with midazolam (0.06 mg kg?1 IV) and ketamine (2.5 mg kg?1 IV) and maintained with either isoflurane (Fe’Iso = 1.1%) (T-ISO) or an IV combination of romifidine (120 μg kg?1 per hour), midazolam (0.09 mg kg?1 hour?1) and ketamine (3.3 mg kg?1 hour?1) (T-TIVA), while breathing 60% oxygen (FIO2). The circumference changes of the rib cage (RC) and abdominal compartment (ABD) were recorded using respiratory ultrasonic plethysmography (RUP). Balloon tipped catheters were placed in the distal oesophagus and the stomach and maximal transdiaphragmatic pressure (Pdi max) was calculated during Mueller's manoeuvre.ResultsThe breathing pattern T-ISO was more regular and respiratory rate significantly lower compared with T-TIVA. Ponies in T-TIVA showed regularly appearing sighs, which were never observed in T-ISO. Different contribution of the RC and ABD compartments to the breathing pattern was observed with a smaller participation of the RC to the total volume change during T-ISO. Transdiaphragmatic pressures (mean 13.7 ± SD 8.61 versus 23.4 ± 7.27 cmH2O, p < 0.0001) were higher in T-TIVA compared to T-ISO. The sum of the RC and ABD circumferential changes was lower during T-TIVA compared to T-ISO (6.32 ± 4.42 versus 11.72 ± 4.38 units, p < 0.0001).Conclusion and clinical relevanceMarked differences in breathing pattern and transdiaphragmatic pressure exist during inhalation- and TIVA and these should be taken into account for clinical estimation of anaesthetic depth. |
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Keywords: | breathing pattern isoflurane ponies total intravenous anaesthesia transdiaphragmatic pressure |
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