We're unable to sign you in at this time. Please try again in a few minutes.
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
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 |

Ventilation Perfusion Relationships Following Correction of Kyphoscoliosis

Daniel C. Shannon, MD; Edward J. Riseborough, MD; Homayoun Kazemi, MD
JAMA. 1971;217(5):579-584. doi:10.1001/jama.1971.03190050037007.
Text Size: A A A
Published online


Lung function was evaluated in 13 patients before and after surgical correction of spinal deformity. Lung volumes were unchanged, physiologic dead space fell from 155 to 90 ml, and minute ventilation fell from 9.22 to 7.67 liters/min. Arterial oxygen tension (P02) rose from 87 to 93 mm Hg at rest and from 80 to 85 mm Hg during exercise. The alveolar-arterial Po2 gradient fell from 26 to 20 mm Hg at rest and was unchanged (90 mm Hg) while breathing oxygen. Distribution of ventilation and perfusion, studied with xenon Xe 133, was normal in patients with curves less than 65°. In those with curves exceeding 70°, ventilation in each lung zone was variable. The normal perfusion gradient from upper to lower lung zones was equally reduced both before and after correction.


Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?




Also 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.
Please click the checkbox indicating that you have read the full article in order to submit your answers.
Your answers have been saved for later.
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.


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

0 Citations

Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

Related Content

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