This study aimed at describing selected hematological, biochemical, and acid-base variables of adult horses living at sea level and comparing them to those living at 5 different altitudes. One hundred and thirty-eight healthy Paso Fino horses > 2 years old were enrolled. Altitudes included the following: altitude A (0 to 50 m above sea level, masl; n = 23), B (1000 to 1050 masl; n = 25), C (1450 masl; n = 30), D (1950 to 2050 masl; n = 30), and E (2950 to 3100 masl; n = 30). A portable blood gas analyzer was used to determine selected biochemical and acid-base variables. Hematocrit (Htc) was measured by blood centrifugation and total plasma protein as total solids using a refractometer. A one-way ANOVA with Tukey’s HSD post hoc test or a Wilcoxon signed-rank test, depending of the normality of the data, was conducted to compare groups. Horses at sea level had lower Htc (25% ± 2) and Hb (8 ± 0.8 mg/dL) concentration than those horses living ≥ 1000 masl (P < 0.05, for all comparisons). No differences in Htc and Hb were identified in horses living between 1000 and 3000 masl (P > 0.05, for all comparisons). The venous P_vCO₂ was significantly lower in horses living at altitudes ≥ 1000 masl than those living at 0 masl (42 ± 4.8 mmHg) (P = 0.001, for all comparisons). No differences in P_vCO₂ were identified in horses living between 1000 and 3000 masl. This study showed that the Htc, Hb, and P_vCO₂ of horses living at sea level were different compared to those in healthy horses living at altitudes ≥ 1000 masl. However, differences in TPP and electrolyte concentrations were not identified.

这项研究旨在描述生活在海平面上的成年马的选定血液学，生化和酸碱变量，并将其与生活在5个不同高度的马进行比较。入选了38头2岁以上的健康Paso Fino马。海拔高度包括以下几项：海拔A（海拔0至50 m，马氏; n  = 23），B（1000至1050 masl; n  = 25），C（1450 masl; n  = 30），D（1950至2050） masl；n  = 30）和E（2950至3100 masl；n = 30）。便携式血气分析仪用于确定选定的生化和酸碱变量。血细胞比容（Htc）通过血液离心法测定，血浆总蛋白为总固体，使用折光仪。根据数据的正态性，采用Tukey HSD事后检验或Wilcoxon秩和检验进行单向方差分析，以比较各组。与生活水平≥1000 masl的马相比，海平面上的马的Htc（25％±2）和Hb（8±0.8 mg / dL）浓度更低（ 所有比较的P <0.05）。在生活在1000到3000 masl之间的马中，没有发现Htc和Hb的差异（ 对于所有比较，P > 0.05）。静脉P _v CO ₂居住在海拔≥1000 masl的马比居住在0 masl（42±4.8 mmHg）的马低得多（ 对于所有比较，P = 0.001）。在生活在1000至3000马氏之间的马中，没有发现P _v CO _2的差异。该研究表明，与海拔≥1000 masl的健康马匹相比，生活在海平面上的马的Htc，Hb和P _v CO ₂有所不同。但是，没有发现TPP和电解质浓度的差异。