0
We're unable to sign you in at this time. Please try again in a few minutes.
Retry
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
Retry
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......
ARTICLE |

GAS DIFFUSION IN THE LUNGS

JAMA. 1915;LXV(15):1284-1285. doi:10.1001/jama.1915.02580150058024.
Text Size: A A A
Published online

With increasing altitudes the pressure of the air is reduced, and the oxygen tension becomes lower and lower. At a height of about 15,000 feet the barometric pressure is little over half an atmosphere, and the oxygen tension therefore only about 11 per cent. of an atmosphere. The presence of man at any considerable altitude necessitates an adjustment on his part so that the persistent undiminished oxygen requirement of the organism can be satisfied under the enforced changes of atmospheric conditions. Otherwise serious symptoms, which go under the designanation of oxygen starvation, may arise. They doubtless play some part in the malady familiarly known as mountain sickness.

One of the adaptations to the barometric conditions prevailing at considerable heights is an increased pulmonary ventilation. There is an augmentation in both depth and frequency of respiration. The increase in pulmonary ventilation diminishes the alveolar carbon dioxid tension, increases the oxygen tension,

Topics

Sign in

Create a free personal account to sign up for alerts, share articles, and more.

Purchase Options

• Buy this article
• Subscribe to the journal

First Page Preview

View Large
First page PDF preview

Figures

Tables

References

Letters

CME
Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.

Multimedia

Some tools below are only available to our subscribers or users with an online account.

Sign in

Create a free personal account to sign up for alerts, share articles, and more.

Purchase Options

• Buy this article
• Subscribe to the journal

Related Content

Customize your page view by dragging & repositioning the boxes below.

Jobs
brightcove.createExperiences();