Journal of Veterinary Science

The Korean Society of Veterinary Science (대한수의학회)
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Effect of the respiratory rate on the pulse pressure variation induced by hemorrhage in anesthetized dogs

  • Dalhae, Kim (Department of Veterinary Clinical Science, College of Veterinary Medicine, Seoul National University) ;
  • Won-Gyun, Son (Department of Veterinary Clinical Science, College of Veterinary Medicine, Seoul National University) ;
  • Donghwi, Shin (Department of Veterinary Clinical Science, College of Veterinary Medicine, Seoul National University) ;
  • Jiyoung, Kim (Department of Veterinary Clinical Science, College of Veterinary Medicine, Seoul National University) ;
  • Inhyung, Lee (Department of Veterinary Clinical Science, College of Veterinary Medicine, Seoul National University)
  • Received : 2022.03.27
  • Accepted : 2022.07.13
  • Published : 2022.11.30
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Abstract

Background: Studies on anesthetized dogs regarding pulse pressure variation (PPV) are increasing. The influence of respiratory rate (RR) on PPV, in mechanically ventilated dogs, has not been clearly identified. Objectives: This study evaluated the influence of RR on PPV in mechanically ventilated healthy dogs after hemorrhage. Methods: Five healthy adult Beagle dogs were premedicated with intravenous (IV) acepromazine (0.01 mg/kg). Anesthesia was induced with alfaxalone (3 mg/kg IV) and maintained with isoflurane in 100% oxygen. The right dorsal pedal artery was cannulated with a 22-gauge catheter for blood removal, and the left dorsal pedal artery was cannulated and connected to a transducer system for arterial blood pressure monitoring. The PPV was automatically calculated using a multi-parameter monitor and recorded. Hemorrhage was induced by withdrawing 30% of blood (24 mL/kg) over 30 min. Mechanical ventilation was provided with a tidal volume of 10 mL/kg and a 1:2 inspiration-to-expiration ratio at an initial RR of 15 breaths/min (baseline). Thereafter, RR was changed to 20, 30, and 40 breaths/min according to the casting lots, and the PPV was recorded at each RR. After data collection, the blood was transfused at a rate of 10 mL/kg/h, and the PPV was recorded at the baseline ventilator setting. Results: The data of PPV were analyzed using the Friedman test followed by the Wilcoxon signed-rank test (p < 0.05). Hemorrhage significantly increased PPV from 11% to 25% at 15 breaths/min. An increase in RR significantly decreased PPV from 25 (baseline) to 17%, 10%, and 10% at 20, 30, and 40 breaths/min, respectively (all p < 0.05). Conclusions: The PPV is a dynamic parameter that can predict a dog's hemorrhagic condition, but PPV can be decreased in dogs under high RR. Therefore, careful interpretation may be required when using the PPV parameter particularly in the dogs with hyperventilation.

Keywords

Acknowledgement

The authors would like to thank the Basic Science Research Promotion program through the National Research Foundation of Korea funded by the Ministry of Education, Science and Technology (2020R1I1A1A01069247) and the BK21 PLUS program and Research Institute of Veterinary Science, College of Veterinary Medicine, Seoul National University for their financial support, and the trainers for their cooperation and assistance.

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