Evaluation of variables to describe the shape of volumetric capnography curves during bronchoconstriction in dogs

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• 作者：Martina Mosing^a ; ^{mmosing@vetclinics.uzh.ch} ; Isabelle Iff^b ; Reinhard Hirt^c ; Yves Moens^d ; Gerardo Tusman^e
• 关键词：Carbachol ; Dog ; Dead space ; Single-breath test ; Slope
• 刊名：Research in Veterinary Science
• 出版年：2012
• 期刊代码：272_00345288
• 类别：med
• 出版时间：August, 2012
• 卷：93
• 期：1
• 页码：386-392
• 文件大小：498 K

摘要

The aim of the study was to investigate changes in volumetric capnography (V_C) variables during bronchoconstriction in dogs and compare it with total respiratory resistance (R_L) measured with a Fleisch pneumotachograph. Six dogs were challenged with increasing concentrations of carbachol until obvious signs of bronchoconstriction were seen. All V_C parameters were obtained before, directly after, 10 and 20 min after maximal bronchoconstriction. The slope of phase III (SIII) and airway and alveolar dead space parameters were significantly different from baseline directly after the challenge. The V_C curve obtained a typical shape at the time of maximal bronchoconstriction and a trend to return to baseline shape was seen over time. A significant correlation was found for all aforementioned parameters with R_L. We conclude that the shape of the V_C curve in combination with dead space calculation can be used to verify bronchoconstriction on a breath-to-breath basis.