Featured Research

from universities, journals, and other organizations

Heart attack death rates linked to ambulance diversion

Date:
June 13, 2011
Source:
University of California - San Francisco
Summary:
Heart attack patients die at a higher rate when their nearest emergency room is so overtaxed that the ambulance transporting them is dispatched to another hospital, according to a new study.

Heart attack patients die at a higher rate when their nearest emergency room is so overtaxed that the ambulance transporting them is dispatched to another hospital, according to a new study led by scientists at the University of California, San Francisco.

Related Articles


The findings are published online June 12, 2011 by JAMA, the Journal of the American Medical Association. The research also will be presented on June 13, 2011 at the AcademyHealth's annual research meeting in Seattle, WA.

"This is one of the first studies to tie patient-level outcomes to daily ambulance diversion logs across multiple cities and counties," says senior author Renee Y. Hsia, MD, assistant professor of emergency medicine at UCSF. She also works as an emergency physician attending at San Francisco General Hospital.

"Everyone knows that ER crowding is a problem. What people need to know is whether crowding affects them and their health. Those of us who work in the ER know that when it's crowded, it affects our ability to provide optimal care. In the study, we finally show that when ambulances are diverted, the outcomes of patients with acute myocardial infarction are worse. In fact, for every 100 patients who are unfortunate enough to have a heart attack when ambulances are being diverted for long periods of time, our study shows that there are three potentially avoidable deaths."

Ambulance diversion is triggered when a hospital's ER is too busy to accept new patients. The ER is temporarily closed, and the ambulance takes the patient to the next available ER, sometimes miles away. For patients undergoing a heart attack, the lost time can be critical.

Ambulance diversion is a particularly common practice in urban settings. The National Center for Health Statistics has estimated that hospitals divert more than half a million ambulances annually in the United States, especially in winter, averaging about one ambulance every minute.

The study examined the outcomes of 13,860 Medicare patients admitted between 2000 and 2005, as well as daily ambulance logs from four densely populated counties in California -- Los Angeles, San Francisco, San Mateo and Santa Clara. The counties represent 63 percent of the state's population. The data encompassed 508 different zip codes and 149 emergency departments.

When the closest ER was on diversion status for at least 12 hours, long-term mortality rates of patients rose during a 30-day, 90-day, 9-month and 1-year period. For example, the 30-day mortality rate of heart attack patients unaffected by diversion on their day of admission was 15 percent compared to an 18 percent mortality rate for patients admitted to the hospital on days with more than 12 hours of diversion. One-year mortality for patients not affected by diversion was 29 percent compared to 32 percent for diverted patients, even when controlling for age, co-morbidities, catheterization capabilities, hospital size, and other factors.

The authors say the study points to the need for hospitals to reapportion resources to reduce ER crowding and prolonged ambulance diversion.

"While demand on emergency care is increasing…supply of emergency care is decreasing," the authors note. "If these issues are not addressed on a larger scale, ED conditions will deteriorate, leaving significant implications for all."

The study was supported by funding from the Robert Wood Johnson Foundation, the National Institutes of Health/National Center for Research Resources, and the Clinical & Translational Science Institute at UCSF. The sponsors had no role in the design and conduct of the study, in the gathering and analysis of data or the writing of the report.


Story Source:

The above story is based on materials provided by University of California - San Francisco. Note: Materials may be edited for content and length.


Journal Reference:

  1. Y.-C. Shen, R. Y. Hsia. Association Between Ambulance Diversion and Survival Among Patients With Acute Myocardial Infarction. JAMA: The Journal of the American Medical Association, 2011; 305 (23): 2440 DOI: 10.1001/jama.2011.811

Cite This Page:

University of California - San Francisco. "Heart attack death rates linked to ambulance diversion." ScienceDaily. ScienceDaily, 13 June 2011. <www.sciencedaily.com/releases/2011/06/110613142313.htm>.
University of California - San Francisco. (2011, June 13). Heart attack death rates linked to ambulance diversion. ScienceDaily. Retrieved December 20, 2014 from www.sciencedaily.com/releases/2011/06/110613142313.htm
University of California - San Francisco. "Heart attack death rates linked to ambulance diversion." ScienceDaily. www.sciencedaily.com/releases/2011/06/110613142313.htm (accessed December 20, 2014).

Share This


More From ScienceDaily



More Health & Medicine News

Saturday, December 20, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

The Best Tips to Curb Holiday Carbs

The Best Tips to Curb Holiday Carbs

Buzz60 (Dec. 19, 2014) It's hard to resist those delicious but fattening carbs we all crave during the winter months, but there are some ways to stay satisfied without consuming the extra calories. Vanessa Freeman (@VanessaFreeTV) has the details. Video provided by Buzz60
Powered by NewsLook.com
Sierra Leone Bikers Spread the Message to Fight Ebola

Sierra Leone Bikers Spread the Message to Fight Ebola

AFP (Dec. 19, 2014) More than 100 motorcyclists hit the road to spread awareness messages about Ebola. Nearly 7,000 people have now died from the virus, almost all of them in west Africa, according to the World Health Organization. Video provided by AFP
Powered by NewsLook.com
Researchers Test Colombian Village With High Alzheimer's Rates

Researchers Test Colombian Village With High Alzheimer's Rates

AFP (Dec. 19, 2014) In Yarumal, a village in N. Colombia, Alzheimer's has ravaged a disproportionately large number of families. A genetic "curse" that may pave the way for research on how to treat the disease that claims a new victim every four seconds. Duration: 02:42 Video provided by AFP
Powered by NewsLook.com
Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Double-Amputee Becomes First To Move Two Prosthetic Arms With His Mind

Buzz60 (Dec. 19, 2014) A double-amputee makes history by becoming the first person to wear and operate two prosthetic arms using only his mind. Jen Markham has the story. Video provided by Buzz60
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Health & Medicine

Mind & Brain

Living & Well

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins