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2000, Number 1

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Rev Inst Nal Enf Resp Mex 2000; 13 (1)

Gasometric values calculated for the largest cities and places of high altitud in Mexico

Vázquez GJC, Pérez PR

Language: Spanish
References: 6
Page: 6-13
PDF size: 183.84 Kb.


ABSTRACT

Background: Great geographical diversity exists in Mexico with respect to altitude. However, information on normal gasometric values at various altitudes is scarce. Objective: To calculate the gasometric values for the largest cities and highest places in Mexico using a previously published theoretical model. Methods: PaCO2 values were calculated using two linear regression models for acute exposure to altitude (PaCO2=37.78-0 908A, where A is the altitude in km), and after acclimatization (PaCO2=38.3-2.5A), PAO2 values were calculated with the alveolar gas equation based on barometric pressure values estimated from the altitude. Finally, PaO2 was obtained considering an alveolar-arterial difference of 6 mmHg (average for young individuals in Mexico). Results: Calculated values for PaO2, PAO2 and PaCO2 are presented for the largest cities and the highest towns, train stations and mountains in Mexico. Conclusion: Calculated gasometric values can be of much use in absence of reference values in Mexico. However, users should consider the possible differences with real values due to geographic, atmospheric and biological factors.


REFERENCES

  1. Lizardi GD, Pérez PJR. Las altitudes sobre el nivel del mar en México: Principales poblaciones carreteras, vías férreas, montañas y viajes aéreos. Guía para los neumólogos y sus pacientes. Neumol Cir Tórax 1993; 52:7-14.

  2. Pérez MSO, Pérez PJR. Valores gasométricos en sujetos sanos reportados en la población mexicana: Revisión y análisis. Rev Inv Clin 1992; 44:453-462.

  3. Pérez-Padilla JR, Vázquez GJC. Estimación de valores gasométricos a diferentes alturas sobre el nivel del mar. Rev Inv Cli 2000; 52:148-155.

  4. Fitzgerald MP. The changes in the breathing and the blood at various high altitudes. Phil Trans Roy Soc London Ser B 1913; 203:351-371.

  5. Kellog RH. Altitude acclimatization: A historical introduction emphasizing the regulation of breathing. Physiologist 1968; 11:37-57.

  6. Ward MP, Miledge JS, West JB. The atmosphere. In: High altitude medicine and physiology. Philadelphia, EEUU: Chapman and Hall, 1989: 27-43.




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