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Published Online
on August 31, 2006

Stroke. 2006
Published online before print August 31, 2006, doi: 10.1161/01.STR.0000239661.07675.9d
A more recent version of this article appeared on October 1, 2006
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Submitted on February 8, 2006
Revised on May 26, 2006
Accepted on June 6, 2006

Feasibility of Acute Clinical Trials During Aerial Interhospital Transfer

Enrique C. Leira MD*; Diane L. Lamb RN, BSN; Andrew S. Nugent MD; Azeemuddin Ahmed MD; Karla J. Grimsman RN; William R. Clarke PhD; and Harold P. Adams Jr MD

From the Division of Cerebrovascular Diseases, Department of Neurology (E.C.L., K.J.G., H.P.A., Jr), and the Department of Emergency Medicine (D.L.L., A.S.N., A.A.), Roy J. and Lucille A. Carver College of Medicine, and the Department of Biostatistics, College of Public Health (W.R.C.), University of Iowa. Iowa City.

* To whom correspondence should be addressed. E-mail: enrique-leira{at}uiowa.edu.

Background and Purpose--In rural America, patients are often first seen at a small community hospital and then transferred to a tertiary care center by helicopter for further care. If acute clinical research were feasible during the aerial interhospital transport, more patients might be enrolled in trials at a critical earlier stage.

Methods--Prospective data were collected for all aerial transfers of a university-based helicopter service from April 2005 to January 2006. Flight nurses were educated about stroke research and offered certification and participation. Data collected included patient characteristics and the availability of relatives to provide surrogate consent.

Results--All 12 flight nurses completed the institutional review board certification requirements and collected data on 215 transfers. Sixty-one patients had acute stroke or myocardial events (MIs). The median time from symptom onset to helicopter arrival at an outside hospital was 213 minutes (range, 90 to 2135) for ischemic stroke (n=12), 186 (45 to 1332) for intracranial hemorrhage (n=28), and 157 (47 to 1044) for MI (n=21). A relative was available in >74% of those transfers. A trial with a 4-hour window would permit enrollment of 67% of the ischemic strokes, 82% of intracranial hemorrhage cases, and 76% of MI patients.

Conclusions--Clinical trials are feasible during aerial interhospital transport of patients. Flight nurses became successful investigators in clinical research and were exposed to potentially eligible patients with the ability to consent either directly or through surrogates. This approach could improve current clinical trial recruitment in rural areas, as well as permit testing of inflight ancillary interventions to improve outcome during patient transport.


Key words: air ambulances • clinical trials • delivery of health care • emergency medical services • rural population




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Arch NeurolHome page
E. C. Leira, D. C. Hess, J. C. Torner, and H. P. Adams Jr
Rural-Urban Differences in Acute Stroke Management Practices: A Modifiable Disparity
Arch Neurol, July 1, 2008; 65(7): 887 - 891.
[Abstract] [Full Text] [PDF]