The New England Journal of Medicine
e-mail icon  FREE NEJM E-TOC    HOME   |   SUBSCRIBE   |   CURRENT ISSUE   |   PAST ISSUES   |   COLLECTIONS   |    Advanced Search
Sign in | Get NEJM's E-Mail Table of Contents — Free | Subscribe
 
Correspondence
PreviousPrevious
Volume 349:1573-1574 October 16, 2003 Number 16
NextNext

Renal Arterial Resistance Index

Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

 Sign up for free e-toc
 

This Article
-Full Text
- PDF
-PDA Full Text
-Purchase this article

Tools and Services
-Add to Personal Archive
-Add to Citation Manager
-Notify a Friend
-E-mail When Cited
-E-mail When Letters Appear

More Information
-Related Article
by Marsden, P. A.
-Related Article
by Radermacher, J.
-PubMed Citation
To the Editor: Radermacher et al. (July 10 issue)1 assert that the renal arterial resistance index is associated with the prognosis for renal-transplant recipients. This study raises methodologic issues. Survival data are defined in terms of the time from an initiating event (the time origin) to some terminal event.2,3 The date of ultrasonography is a questionable time origin, since it is not a well-defined event; indeed, ultrasonography took place at a random date between 3 and 317 months after transplantation. In our opinion, the time origin should be closely related to the date of transplantation, which would uniformly define time . . . [Full Text of this Article]



HOME  |  SUBSCRIBE  |  SEARCH  |  CURRENT ISSUE  |  PAST ISSUES  |  COLLECTIONS  |  PRIVACY  |  TERMS OF USE  |  HELP  |  beta.nejm.org

Comments and questions? Please contact us.

The New England Journal of Medicine is owned, published, and copyrighted © 2009 Massachusetts Medical Society. All rights reserved.