LOS ANGELES, Nov. 4, 2012 (GLOBE NEWSWIRE) -- Family members didn't
give CPR for cardiac arrests as often as passers-by or friends in a
Japanese study presented at the American Heart Association's Scientific
Cardiac arrest is the sudden loss of heart function, typically
resulting from an abnormal heart rhythm that causes the heart to quiver
erratically and stop pumping blood. According to the American Heart
Association, effective bystander CPR provided immediately after sudden
cardiac arrest can double or triple a victim's chance of survival.
In a review of 547,218 cardiac arrests occurring in 2005-09,
researchers identified almost 140,000 incidents witnessed by bystanders
without a physician's involvement. Bystander groups studied included
family members, friends and colleagues, passers-by and others.
-- The time interval between collapse and emergency call and between call
and arrival to patients was shortest when witnessed by passers-by.
-- Family members were least likely (36.5 percent) to administer CPR, but
most likely to receive telephone instructions from dispatchers (45.8
-- The telephone instruction to family members most frequently failed (39.4
percent) and family members most often used chest compressions only
"If you go into cardiac arrest in front of your family, you may not
survive," said Hideo Inaba, M.D., Ph.D., lead author of the study and
professor and chairman of the Department of Emergency Medical Science
at Kanazawa University Graduate School of Medicine in Kanazawa, Japan.
"Different strategies, including basic life support instruction
targeting smaller households, especially those with elderly residents,
would improve survival, as would recruiting well-trained citizens
willing to perform CPR on victims whose arrest was witnessed by family
CPR provided by family members may have been ineffective due to their
lack of knowledge or fear of injuring their loved one, said Inaba.
Cultural and demographic issues in Japan, which has a large gender gap,
may also have contributed to the findings, he said.
In a study conducted in 2008, researchers found that Japanese women
were less likely to attempt CPR. Men accounted for a majority of
cardiac arrests in the current study, and their wives or
daughters-in-law witnessed most of them, researchers said.
Japan has a rapidly aging population, with elderly people, mostly
couples, in 42 percent of households in 2010, Inaba said.
"These characteristics of Japanese households might have contributed to
our observations and may be different from households in the United
States," Inaba said. "Also, the percentage of older persons in Japan is
larger than in the U.S. population. So the results may be less
Furthermore, the database didn't include the exact location of each
cardiac arrest, although basic life support response and outcomes
differ between locations. The type of bystander who responds is also
closely related to the location of the cardiac arrest.
Co-authors are: Takahisa Kamikura, M.D.; Tetsuo Maeda, M.D.; Yoshitaka
Hamada, M.D., Ph.D.; Satoru Sakagami, M.D., PhD; and Taiki Nishi and
Keiko Takase, master course students.
Author disclosures are on the abstract.
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