Featured Research

from universities, journals, and other organizations

"Happy Hour" Is Unhappy For Many Cardiac Arrest Victims

Date:
July 9, 1998
Source:
American Heart Association
Summary:
An analysis of telephone calls to an emergency medical services (EMS) system shows that cardiac arrests commonly occur during the afternoon, as well as in the morning. This is the first to show a definitive peak in the "happy hour" time of day from about 5 to 8 p.m. The fact that the arrests occur at certain times of the day is a phenomenon called circadian rhythm.

DALLAS, July 7 -- An analysis of telephone calls to an emergency medical services (EMS) system shows that cardiac arrests commonly occur during the afternoon, as well as in the morning, according researchers reporting in today's Circulation: Journal of the American Heart Association.

Leonard Cobb, M.D. and Alfred P. Hallstrom, Ph.D. at the department of biostatistics and the division of cardiology at the University of Washington, Seattle, used records from the Seattle EMS and found a high number of calls for cardiac arrests in the late afternoon. Studies, including this one, have shown that many cardiac arrests occur around 8 a.m. This is the first to show a definitive peak in the "happy hour" time of day from about 5 to 8 p.m. The fact that the arrests occur at certain times of the day is a phenomenon called circadian rhythm. Circadian rhythms are tied to the 24-hour cycle of the earth's rotation and are possibly a result of changing amounts of light and darkness as a day progresses.

The explanation for the morning peak may be that chemicals that stimulate the heart are at higher levels in the morning than afternoon. But different factors may be at play in causing the afternoon peak.

Over a 23-year period, scientists researched 5,248 adults who had cardiac arrests not caused by drug overdose or respiratory arrest. The 3,690 of these that were witnessed arrests were used to compare circadian variations among subgroups (male vs. female, race comparisons, and age comparisons).

During the study, 597 of the patients had more than one cardiac arrest Of these, 325 could provide a near-exact time of the second cardiac arrest. No difference in times of heart attacks was found between races, genders, or working days vs. weekend days.

The study also provided new information about individuals who have more than one cardiac arrest. The study found that individuals who had a cardiac arrest in the morning had about the same chance of having another morning arrest as an afternoon arrest. Researchers concluded that an environmental, rather than biological, factor explains the pattern of cardiac arrests.

"Cardiac arrests do not occur randomly during the day, but rather follow certain periodic patterns. These patterns are probably associated with patterns of daily activities? rather than some underlying characteristic the disease," says Hallstrom.

This study shows that the afternoon peak is as high as the morning peak and that the afternoon cardiac arrest were often due to ventricular fibrillation -- the rapid, disordered contraction of the ventricles -- which is the most "treatable" cause of cardiac arrest, says Hallstrom.

"Ventricular fibrillation can frequently be shocked, or defibrillated, back into a normal rhythm and the other types of cardiac arrest that typically occur in the morning usually can't be shocked effectively," Hallstrom says. Co-authors are Monika Peckova, M.S., Ph.D. and Carol E. Fahrenbruch, M.S.P.H.


Story Source:

The above story is based on materials provided by American Heart Association. Note: Materials may be edited for content and length.


Cite This Page:

American Heart Association. ""Happy Hour" Is Unhappy For Many Cardiac Arrest Victims." ScienceDaily. ScienceDaily, 9 July 1998. <www.sciencedaily.com/releases/1998/07/980709085711.htm>.
American Heart Association. (1998, July 9). "Happy Hour" Is Unhappy For Many Cardiac Arrest Victims. ScienceDaily. Retrieved August 21, 2014 from www.sciencedaily.com/releases/1998/07/980709085711.htm
American Heart Association. ""Happy Hour" Is Unhappy For Many Cardiac Arrest Victims." ScienceDaily. www.sciencedaily.com/releases/1998/07/980709085711.htm (accessed August 21, 2014).

Share This




More Health & Medicine News

Thursday, August 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Drug Used To Treat 'Ebola's Cousin' Shows Promise

Drug Used To Treat 'Ebola's Cousin' Shows Promise

Newsy (Aug. 21, 2014) An experimental drug used to treat Marburg virus in rhesus monkeys could give new insight into a similar treatment for Ebola. Video provided by Newsy
Powered by NewsLook.com
Cadavers, a Teen, and a Medical School Dream

Cadavers, a Teen, and a Medical School Dream

AP (Aug. 21, 2014) Contains graphic content. He's only 17. But Johntrell Bowles has wanted to be a doctor from a young age, despite the odds against him. He was recently the youngest participant in a cadaver program at the Indiana University NW medical school. (Aug. 21) Video provided by AP
Powered by NewsLook.com
American Ebola Patients Released: What Cured Them?

American Ebola Patients Released: What Cured Them?

Newsy (Aug. 21, 2014) It's unclear whether the American Ebola patients' recoveries can be attributed to an experimental drug or early detection and good medical care. Video provided by Newsy
Powered by NewsLook.com
Lost Brain Cells To Blame For Sleep Problems Among Seniors

Lost Brain Cells To Blame For Sleep Problems Among Seniors

Newsy (Aug. 21, 2014) According to a new study, elderly people might have trouble sleeping because of the loss of a certain group of neurons in the brain. 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