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 |

To the Editor.—

Behram Pastakia, MB; A. A. MacKinney Jr, MD
Arch Intern Med. 1980;140(2):286. doi:10.1001/archinte.1980.00330140144053.
Text Size: A A A
Published online


The editorial in the Archives (139:143, 1979) on leg scanning does not sufficiently emphasize recent scanning alternatives that have been developed to solve this clinical problem.

The low (18%) sensitivity in detecting deep vein thrombosis from Hunter's canal to the inguinal ligament reported in the Archives (139:148-153, 1979) may be explained in part by the physical characteristics of the isotope used. The photons from fibrinogen I 125 are a 35.5-keV υray and a 27-keV x-ray. These relatively soft photons are easily attenuated by the body tissues surrounding the deep veins. Since muscle mass in the thighs is greater than in the calves, detection efficiency (and hence the sensitivity of the test) drops in the proximal portions of the lower extremities. The signal-to-noise ratio also is worse in the pelvis than in the legs due to problems of blood pooling. The solution to this problem is to use an isotope with


Sign in

Purchase Options

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

First Page Preview

View Large
First page PDF preview





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.