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Prevalence and Effectiveness
Chance of getting CPR
Various studies suggest that in out of home cardiac arrest, bystanders, lay
persons or family members attempt CPR in between 14% and 45% of the time, with a
median of 32%. This indicates that around 1/3 of out-of-home arrests have a CPR
attempt made on them. However, the effectiveness of this CPR is variable, and
the studies suggest only around half of bystander CPR is performed correctly.
There is a clear correlation between age and the chance of CPR being commenced,
with younger people being far more likely to have CPR attempted on them prior to
the arrival of emergency medical services. It was also found that CPR was more
commonly given by a bystander in public, than when an arrest occurred in the
patient's home, although health care professionals are responsible for more than
half of out-of-hospital resuscitation attempts. This is supported by further
research, which suggests that people with no connection to the victim are more
likely to perform CPR than a member of their family.
There is also a correlation between the cause of arrest and the likelihood of
bystander CPR being initiated. Lay persons are most likely to give CPR to
younger cardiac arrest victims in a public place when it has a medical cause;
victims in arrest from trauma, exsanguination or intoxication are less likely to
receive CPR.
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