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Cardiac Arrest
And CPR
CPR during cardiac arrest: someone’s life is in your hands
Daniel Pendick
Former Executive Editor, Harvard Men’s Health Watch
Former Executive Editor, Harvard Men’s Health Watch
Cardiac
arrest is the ultimate 911 emergency. The heart stops sending blood to the body
and brain, either because it is beating too fast and too erratically, or
because it has stopped beating altogether.
Oxygen-starved
brain cells start to die. Death occurs in minutes — unless a bystander takes
matters into his or her hands and starts cardiopulmonary resuscitation (CPR).
Doing CPR keeps blood circulating
until trained and better-equipped first responders arrive on the scene to
jump-start the heart back into a normal rhythm.
“The brain is the most sensitive of
the body’s organs to oxygen deprivation,” says Robert Graham, a health policy scholar at George
Washington University and chair of a National Academy of Medicine (formerly the
Institute of Medicine) committee that recently released a massive new report on
ways to improve survival from cardiac arrest.
“If you can
continue blood flow to the brain for those five, seven, or ten minutes until
the first responders get there, you have given that person the best chance that
they have toward recovery.”
New evidence backs better survival with CPR
In
the Journal of the American Medical Association (JAMA), two
teams of researchers provide compelling proof of the principle that “time equals brain,” and that efforts to
improve the response to cardiac arrests can pay off.
In the ideal scenario, a bystander
· witnesses an individual go into
cardiac arrest
· calls 911
· starts CPR right away, and continues
doing it until another bystander or first responder can use an automated
external defibrillator (AED) to shock the heart back to a normal rhythm.
AEDs are portable gadgets that
deliver a brief electrical shock to the heart to get it pumping normally.
They’re increasingly found in public places, such as shopping malls.
Unfortunately,
they often sit unused in their cabinets — even when there’s a real emergency.
One team evaluated the impact of a
North Carolina initiative to train the general public in CPR and AED use.
As
part of the campaign, emergency workers also received training in how to
recognize cardiac arrest and respond appropriately.
This team’s study covered nearly
5,000 cardiac arrests that occurred between 2010 and 2013 in North Carolina.
The
percentage of people who received ideal cardiac arrest care increased from 14%
to 23% during that time period.
At
the same time, survival without brain damage increased from 7.1% to 9.7%.
The other team mined a database of
168,000 out-of-hospital cardiac arrests that occurred in Japan
between 2005 and 2012.
During
that period, the percentage of people with cardiac arrest who received
bystander CPR increased from 39% to 51%.
At
the same time, “neurologically intact” survival increased from 4.1% to 8.4%.
You can get lost in all these
numbers, but the overall message is that having more people on the street who
can recognize and respond quickly to a cardiac arrest saves brains - and lives.
More people need to learn CPR
There
is still plenty of room for improvement.
Of
the 400,000 or so Americans who go into cardiac arrest outside of a hospital
every year, only 6% survive the crisis.
That
low percentage might have something to do with the fact that only 3% of
Americans learn how to do CPR each year.
The National Academy of Medicine
report showed that some communities have substantially boosted survival from
cardiac arrest.
Seattle,
for example, has improved cardiac arrest response on two fronts — in the number
of trained bystanders and in the effectiveness of the first responders.
In
fact, Seattle’s survival rate has exceeded 60% for out-of-hospital cardiac
arrests that were witnessed by someone.
Compare
that to the single-digit rates in many other urban areas.
“It’s really been a reflection of
individual leadership and having people who decide this is important and are
willing to work on it for 20 years,” Graham
says.
“You have a larger cadre of individuals who are trained to
recognize cardiac arrest and who have a mindset to respond.”
Communities like Seattle “can serve as benchmarks to say this is possible. It’s not
insurmountable,” Graham adds.
The National Academy of Medicine
report offers recommendations for how to get there from here.
Two
key ones are creating a national cardiac arrest registry and expanding programs
in schools and communities to train people in CPR and AED use.
It’s in your hands
If
you want to be ready to help someone who goes into cardiac arrest, the
watchwords are “recognize” and “respond.”
Recognize. Many
people don’t know the difference between cardiac arrest and a heart attack or
fainting spell.
A
person in cardiac arrest doesn’t breathe, doesn’t have a pulse, and can’t
respond to you. Someone having a heart attack usually is conscious and
breathing, has a pulse, and can answer your questions.
Respond. Here’s what you should do if you witness someone go into
cardiac arrest:
1. Call 911 right away, or have someone
else do it. That call means emergency medical responders are headed your way.
2. Start hands-only chest compressions:
o Put one hand over the other, and
place both on the person’s breastbone, in the middle of his or her chest.
o Press hard enough to make the chest
move inward about an inch.
o Relax, and repeat. Do this about 100
times a minute. For the right tempo, think of the beat to the Bee Gees’ disco
anthem “Stayin’ Alive.”
3. Keep doing CPR until someone arrives
with an AED - either a bystander who has obtained one from a nearby business or
building, or a first responder.
Mouth-to-mouth
breathing isn’t necessary if you are doing CPR on someone you saw go into
cardiac arrest.
That’s
because the individual’s blood has enough stored oxygen to keep him or her
going for a while.
Get trained
Many
organizations sponsor CPR and AED training programs.
Two
notable ones are the American Heart Association and the American Red Cross.
Some
are in-person courses; others are online.
Many
local departments of public health also provide CPR training, including
“friends and family” classes for people close to someone at risk of cardiac
arrest.
The investment of time and effort to
learn CPR is small. The potential payoff — saving a life — is huge.
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