End-Tidal Partial Pressure of CO<SUB>2</SUB> for Estimating Arterial Partial Pressure of CO<SUB>2</SUB> during Inhalation Anesthesia in Dogs

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  • 吸入麻酔犬の動脈血炭酸ガス分圧の指標としての終末呼気炭酸ガス分圧
  • キュウニュウ マスイケン ノ ドウミャク ケッタンサン ガス ブンアツ ノ シヒョウ ト シテ ノ シュウマツ コキ タンサンガス ブンアツ
  • End-Tidal Partial Pressure of CO2 for Estimating Arterial Partial Pressure of CO2 during Inhalation Anesthesia in Dogs

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Abstract

The end-tidal partial pressure of carbon dioxide (ETCO2) was evaluated for estimating the arterial partial pressure of CO, (PaCO2) in 88 dogs under inhalation anesthesia during spontaneous ventilation (SV) or intermittent positive pressure ventilation (IPPV). During IPPV ETCO2 was closeley correlated with PaCO2 (r=0.909, p<0.0001, n=45) and difference between the two was 3.8±2.2 mmHg. Also in SV cases with less than 40 breaths/min, ETCO2 was closeley correlated with PaCO2 (r=0.914, p<0.0001, n=100) showing a difference of 5.8±3.8 mmHg, while difference between the two values increased in cases with higher respiratory rates and lying in lateral recumbency. The results suggested that ETCO2 should be kept under 50 mmHg to prevent severe hypercapnia during inhalation anesthesia in dogs.

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