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 |

Impedance Plethysmography for Suspected Deep-Vein Thrombosis

Gary E. Raskob, MSc; Russell D. Hull, MBBS, MSc; Graham F. Pineo, MD
Arch Intern Med. 1995;155(7):773-776. doi:10.1001/archinte.1995.00430070135017.
Text Size: A A A
Published online


We agree with Ginsberg and colleagues that clinicians "... should ensure the performance of serial IPG [impedance plethysmography] during a 7- to 14-day period if results of the initial test are normal."1 However, the authors' statement "... if a patient is considered to have a high clinical likelihood of DVT [deep-vein thrombosis] but has normal findings of IPG at presentation, further testing with venous ultrasonography or venography should be performed"1 is not justified based on their study design or results. Serial testing with IPG is an effective and safe approach for symptomatic patients with negative results of IPG at presentation.2-6 The safety of serial IPG testing in such patients has been established by five prospective studies2-6 that measured clinical outcome on follow-up. In these studies, none of the 1234 patients with serially negative IPG results died of pulmonary embolism, and only two patients (0.2%) had a symptomatic nonfatal


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.

1 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.