JOURNAL OF
VASCULAR SURGERY Copyright © 1992 by The Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery
EDITORS
CALVIN B. ERNST,
DETROIT
JAMES C. STANLEY, ANN ARBOR
ASSOCIATE EDITORS ROBERT W. BARNES, LITI'LE ROCK JOHN A. MANNICK, BOSTON
JOHN M. PORTER, PORTLAND JAMES S. T. YAO, CHICAGO
EDITORIAL BOARD WILLIAM M. ABBOTT, BOSTON RONALD J. BAIRn, TORONTO WILLIAM H. BAKER, MAYWOOD, IL JOHN J. BERGAN, LA JOLLA
NORMAN R. HERTZER, CLEVELAND ROBERT W. HOBSON 11, NBWAIlK ANTHONY M. IMPARATO, NEW YORK GEORGE JOHNSON, JR.., CHAPEL HILL
VICTOR M. BERNHARD, roCSON
K. WAYNE JOHNSTON, TOR.ONTO
EUGENE F. BERNSTEIN, LA JOLLA
RICHARD F. KEMPCZINSKI, CINCINNATI
WILLIAM F. BLAISDELL, SACRAMENTO ALLAN D. CALLOW, ST. LOUIS G. PATRICK CLAGETr,
DALLAS
FRANK W. LoGERFO, BOSTON WESLEY S. MOORE, LOS ANGBLES JOHN L. OCHSNER, NEW ORLBANS
ALEXANDER W. CLOWES, SEATILB
MALCOLM O. PERRY, NASHVILLE
JOHN E. CONNOLLY, IRVlNE
NORMAN M. RICH, WASlllNGTON
E. STANLEY CRAWFORD, HOUSTON JACK L. CRONENWETf, LEBANON, NH RICHARD H. DEAN, WINSTON-SALBM JAMES A. DEWEESE, R.OCHESTBR,
NY
ALLAN R. DOWNS, WINNIPEG WILLIAM K. EHRENFELD, SAN FllANCISCO WILLIAMJ. FRY,
ANN
ARBOR
ROBERT B. RUTHERFORD, DENVER DONALD SILVER, COLUMBIA, MO
D. EUGENE STRANDNESS, SEATILE DAVID S. SUMNER, SPRINGFIELD, IL JESSE E. THOMPSON,
DALLAS
M. DAVID TILSON, NEW YORK
JONATHAN B. TOWNE, Mll..WAUKBB
JERRY GOLDSTONE, SAN FRANCISCO
FRANK J. VEITH, NEW YORK
LAZAR J. GREENFIELD,
CHRISTOPHER K. ZARINS, CHICAGO
ANN
ARBOR
FOUNDING EDITOR
CONSULTING EDITOR
NUCHAELE.DBBAKEY
D. EMERICK SZILAGYI
OFFICIAL PUBLICATION
THE SOCIETY FOR VASCULAR SURGERY INTERNATIONAL SOCIETY FOR CARDIOVASCULAR SURGERY NORTH AMERICAN CHAPTER
Volume 15 1992 MOSBY-YEAR BOOK, INC. St. Louis, Missouri