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[Characterization of gas exchange parameters in Mexico City]
Luis Efren Santos-Martínez1, Adrián Arias-Jiménez2, Javier Quevedo-Paredes2
1Instituto Mexicano del Seguro Social, Centro Médico Nacional Siglo XXI, Hospital de Cardiología, Servicio de Hipertensión Pulmonar y Corazón Derecho. Ciudad de México, México.
Background:
At high altitude the gas exchange is impaired, in the moderate altitude of Mexico City they are not yet defined.
Objective:
To characterize the gas exchange in the moderate altitude of Mexico City.
Material And Methods:
Through an analytical cross-sectional study, subjects born and inhabitants of Mexico City, both genders, aged 20 to 59 years without cardiopulmonary disease, were studied. Their demographic variables, simple spirometry and arterial blood gas were recorded. Differences in variables were calculated with one-way ANOVA for independent groups and Bonferroni adjustment. p < 0.05 was accepted as significant.
Results:
335 subjects were studied, 168 (50.15%) men. Group age 45 ± 11 years old, body mass index 22.97 ± 1.54 Kg/m2. Forced expiratory volume ratio in the first second / Forced vital capacity (FEV1/FVC) 91.58 ± 12.86%. The arterial oxygen pressure was: 66 ± 5.02 mmHg, carbon dioxide: 32.07 ± 2.66 mmHg, arterial oxygen saturation: 93.0 3 ± 1.80%, and hemoglobin: 14.07 ± 1.52 gr/dL.
Conclusions:
The arterial oxygen pressure and carbon dioxide are lowered at the Mexico City altitude.
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