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 |

Meta-analysis Pitfalls: Deep Venous Thrombosis in Patients Undergoing Elective Hip Surgery

Darryl K. Potyk, MD
Arch Intern Med. 1994;154(11):1295-1296. doi:10.1001/archinte.1994.00420110143018.
Text Size: A A A
Published online


In a recent issue of the ARCHIVES, Mohr et al1 presented a meta-analysis of deep venous thrombosis (DVT) prophylaxis in patients undergoing elective hip surgery. The authors included only studies in which DVT was diagnosed by venography because, as pointed out in the text, noninvasive measures of asymptomatic DVT in this population are unreliable. Unfortunately, the authors were not as rigorous in their other inclusion criteria and have pooled data in a way that may be misleading.

The authors claim that no heterogeneity was introduced after grouping the prophylactic methods together. Potentially important variations within a single modality exist, and not all of these variations are equally effective in preventing thromboembolic complications. For example, many different warfarin protocols have been advocated, although few of them have been evaluated in prospective randomized trials. The best studied protocol uses a two-step procedure in which patients receive warfarin at low doses beginning


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.