Cardio Monitoring Device Falls Out of Favor

The pulmonary artery catheter doesn't help patients, detailed studies show.

By Ed Edelson
HealthDay Reporter
Tuesday, July 24, 2007; 12:00 AM

Copyright © 2007 ScoutNews, LLC. All rights reserved.

TUESDAY, July 24 (HealthDay News) -- The pulmonary artery catheter, a once-lauded cardiac monitoring device, appears to be fading into medical history, a study finds.

Use of the device -- a thin tube inserted into a lung artery to get information about a patent's condition -- decreased by 68 percent in the United States between 1993 and 2004, according to a report in the July 25 issue of the Journal of the American Medical Association

The reason behind the drop in the device's popularity: "Multiple studies have shown that it doesn't help," according to lead researcher Dr. Renda Soylemez Wiener, an assistant professor of medicine at Dartmouth Medical School and a physician at the Department of Veterans Affairs Medical Center in White River Junction, Vt.

The procedure was first introduced in 1970, and "studies done in the 1980s estimated that 20 to 40 percent of critically injured patients were getting it," Wiener said.

The pulmonary artery catheter provided information on cardiac output and pressure in the small blood vessels of the lung -- apparently important measures of how well the heart was pumping blood.

However, doubts on the value of that information began to surface over the last few decades. One study conducted in 1996 suggested that use of the pulmonary artery catheter actually increased cardiovascular risk for some patients. Then, several major studies found that the device did not increase the patient's risk, but it did not improve their outcome, either.

Doctors seem to have gotten the message, Wiener said. Data from the National Inpatient Sample, a U.S.-wide source of hospital information, found that use of the pulmonary artery catheter "has gone down dramatically, universally," Wiener said, from 5.66 per 1,000 medical admissions in 1993 to 1.99 in 2004. The drop in usage was steepest for patients diagnosed with a heart attack, at 81 percent.

"This may well reflect the end of the story on this monitoring device," said Dr. Gordon D. Rubenfeld, who co-authored an accompanying editorial written while he was at the University of Washington in Seattle. He now is professor of medicine at the University of Toronto.