Featured Research

from universities, journals, and other organizations

Women suffering sudden cardiac arrest have lower prevalence of structural heart disease than men

Date:
November 19, 2009
Source:
Cedars-Sinai Medical Center
Summary:
A woman who suffers sudden cardiac arrest is significantly less likely than a man to exhibit the decrease in the heart's pumping ability that is widely recognized as a precursor, says a new study.

A woman who suffers sudden cardiac arrest is significantly less likely than a man to exhibit the decrease in the heart's pumping ability that is widely recognized as a precursor, says a new study in the Nov. 24 Journal of the American College of Cardiology.

The lack of left ventricular dysfunction could mean that fewer women meet current medical guidelines for implantable cardiac defibrillators that can prevent sudden cardiac arrest, says the study's lead researcher.

"If 100 men have a sudden death heart attack, 40 of them will show a critical decrease in their heart's pumping function prior to their heart attack," said Sumeet S. Chugh, M.D., associate director of the Cedars-Sinai Heart Institute and holder of The Pauline and Harold Price Chair in Cardiac Electrophysiology Research. "But only 20 women of 100 will have that critically reduced pumping ability. We are able to predict sudden cardiac death in men much better than women, and for a condition that has a 95 percent chance of instantaneous death, prediction is everything."

The study also found that among sudden cardiac arrest victims, far fewer women than men had an established diagnosis of coronary artery disease. The reasons remain to be clarified, but coronary artery disease is the condition most commonly associated with sudden cardiac arrest, and symptoms of heart disease often prompt patients to see their doctors and initiate testing and therapy. The authors suggest, therefore, that the lower prevalence of recognized coronary artery disease may be another barrier impeding women from discovering their risk of sudden cardiac arrest and taking preventive steps.

"Men and women have been treated identically for the prevention of sudden cardiac death," Chugh said. "We cannot continue to do that. We need to find novel ways of predicting sudden cardiac death in women because the predictors used so far are more applicable to men."

Unlike heart attacks (myocardial infarction), which are typically caused by clogged coronary arteries reducing blood flow to the heart muscle, sudden cardiac arrest is the result of defective electrical activity of the heart. Patients may have little or no warning, and the disorder usually causes nearly instantaneous death.

Chugh leads the Oregon Sudden Unexpected Death Study, a comprehensive, 16-hospital, multi-year assessment of cardiac deaths in the 1 million population Portland, Ore. metropolitan area. Funded in part by the National Heart Lung and Blood Institute, the study's goal is to shed light on the risk factors, triggers and genetic defects associated with sudden cardiac death.

The new findings are based on 1,568 cases of sudden cardiac arrest identified from 2002 to 2007, with 1,012 male and 556 female subjects. Medical records were available on 1,258 cases (80 percent of the men and 81 percent of the women). Among the findings:

  • Women were older at the time of the event (average age: 71) than men (average age: 65).
  • Women were slightly more likely than men (25 percent to 21 percent) to be successfully revived (return of spontaneous circulation) when resuscitation efforts could be attempted.
  • There were no significant differences related to gender for a variety of health issues, including obesity, blood cholesterol and triglycerides, and history of heart attack (myocardial infarction) and heart failure (left ventricular hypertrophy).
  • 40 percent of women had previously documented coronary artery disease, compared to about 50 percent of men.
  • 21 percent of women had severe left ventricular dysfunction, compared to 36 percent of men.
  • In analyses that controlled all variables to make more precise comparisons, women were half as likely as men to have severe left ventricular dysfunction and a third as likely to have previously diagnosed coronary artery disease.

For patients at known risk for sudden cardiac arrest or other heart rhythm abnormalities, an implantable cardioverter-defibrillator (ICD) may be placed in the chest or abdomen to detect faulty electrical impulses and provide a shock to return normal rhythm.

The left ventricle's pumping ability is the major determinant of sudden cardiac arrest risk, and current guidelines call for patients to receive a device if left ventricular ejection fraction is measured at 35 percent or less. Previous studies have found that only 25 percent to 30 percent of sudden cardiac arrest events occur in patients with severely reduced left ventricular function.

"Under existing guidelines, we may be missing the opportunity to provide preventive intervention for 70 percent to 75 percent of people who will experience sudden cardiac arrest," said Chugh. "Our new findings suggest this number could be even higher for women."


Story Source:

The above story is based on materials provided by Cedars-Sinai Medical Center. Note: Materials may be edited for content and length.


Cite This Page:

Cedars-Sinai Medical Center. "Women suffering sudden cardiac arrest have lower prevalence of structural heart disease than men." ScienceDaily. ScienceDaily, 19 November 2009. <www.sciencedaily.com/releases/2009/11/091116173151.htm>.
Cedars-Sinai Medical Center. (2009, November 19). Women suffering sudden cardiac arrest have lower prevalence of structural heart disease than men. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2009/11/091116173151.htm
Cedars-Sinai Medical Center. "Women suffering sudden cardiac arrest have lower prevalence of structural heart disease than men." ScienceDaily. www.sciencedaily.com/releases/2009/11/091116173151.htm (accessed July 29, 2014).

Share This




More Health & Medicine News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Generics Eat Into Pfizer's Sales

Generics Eat Into Pfizer's Sales

Reuters - Business Video Online (July 29, 2014) Pfizer, the world's largest drug maker, cut full-year revenue forecasts because generics could cut into sales of its anti-arthritis drug, Celebrex. Fred Katayama reports. Video provided by Reuters
Powered by NewsLook.com
Nigeria Ups Ebola Stakes on 1st Death

Nigeria Ups Ebola Stakes on 1st Death

Reuters - Business Video Online (July 29, 2014) Nigerian authorities have shut and quarantined a Lagos hospital where a Liberian man died of the Ebola virus, the first recorded case of the highly-infectious disease in Africa's most populous economy. David Pollard reports Video provided by Reuters
Powered by NewsLook.com
Running 5 Minutes A Day Might Add Years To Your Life

Running 5 Minutes A Day Might Add Years To Your Life

Newsy (July 29, 2014) According to a new study, just five minutes of running or jogging a day could add years to your life. Video provided by Newsy
Powered by NewsLook.com
Ebola Outbreak Poses Little Threat To U.S.: CDC

Ebola Outbreak Poses Little Threat To U.S.: CDC

Newsy (July 29, 2014) The Ebola outbreak in West Africa poses little threat to Americans, according to officials with the Centers for Disease Control and Prevention. Video provided by Newsy
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:
from the past week

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