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DOI: 10.1161/CIRCULATIONAHA.105.166565
2005;112;133-135; originally published online Nov 28, 2005; Circulation
Part 10.3: Drowning
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Part 10.3: Drowning
D
rowning is a leading preventable cause of unintentional
morbidity and mortality. Although this chapter focuses
on treatment, prevention is possible, and pool fencing has
been shown to reduce drowning and submersion injury (Class
I).
1
The most important and detrimental consequence of sub-
mersion is hypoxia. Therefore, oxygenation, ventilation, and
perfusion should be restored as rapidly as possible. This will
require immediate bystander CPR plus immediate activation
of the emergency medical services (EMS) system. Victims
who have spontaneous circulation and breathing when they
reach the hospital usually recover with a good outcome.
Victims of drowning may develop primary or secondary
hypothermia. If the drowning occurs in icy (H110215°C [41°F])
water, hypothermia may develop rapidly and provide some
protection against hypoxia. Such effects, however, have
typically been reported only after submersion of young
victims in icy water (see Part 10.4: “Hypothermia”).
2
All victims of drowning (see definitions below) who
require any form of resuscitation (including rescue breathing
alone) should be transported to the hospital for evaluation and
monitoring even if they appear to be alert with effective
cardiorespiratory function at the scene. The hypoxic insult
can produce an increase in pulmonary capillary permeability
with delayed onset of pulmonary complications.
Definitions, Classifications, and
Prognostic Indicators
A number of terms are used to describe drowning. To aid in
the use of consistent terminology and the uniform reporting
of data from drowning, the Utstein definition and style of data
reporting are recommended
3
:
Drowning. Drowning is a process resulting in primary
respiratory impairment from submersion/immersion in a liq-
uid medium. Implicit in this definition is that a liquid/air
interface is present at the entrance of the victim’s airway,
preventing the victim from breathing air. The victim may live
or die after this process, but whatever the outcome, he or she
has been involved in a drowning incident.
A victim may be rescued at any time during the drowning
process and may not require intervention or may receive
appropriate resuscitation measures. In either case the drown-
ing process is interrupted.
The Utstein statement recommends that the term near-
drowning no longer be used. It also de-emphasizes classifi-
cation based on type of submersion fluid (salt water versus
fresh water). Although there are theoretical differences that
have been reported in laboratory conditions, these have not
been found to be clinically significant. The most important
factors that determine outcome of drowning are the duration
and severity of the hypoxia.
Although survival is uncommon in victims who have
undergone prolonged submersion and require prolonged re-
suscitation,
4,5
successful resuscitation with full neurologic
recovery has occasionally occurred with prolonged submer-
sion in icy water.
6–8
For this reason, scene resuscitation
should be initiated and the victim transported to an ED unless
there is obvious physical evidence of death.
Modifications to Basic Life Support
for Drowning
No modification of standard BLS sequencing is necessary.
Some cautions are appropriate, however, when beginning
CPR for the drowning victim.
Recovery From the Water
When attempting to rescue a drowning victim, the rescuer
should get to the victim as quickly as possible, preferably by
some conveyance (boat, raft, surfboard, or flotation device).
The rescuer must always be aware of personal safety.
Recent evidence indicates that routine stabilization of the
cervical spine is not necessary unless the circumstances leading
to the submersion episode indicate that trauma is likely (Class
IIa). These circumstances include a history of diving, use of a
water slide, signs of injury, or signs of alcohol intoxication.
9
In
the absence of such indicators, spinal injury is unlikely. Manual
cervical spine stabilization and spine immobilization equipment
may impede adequate opening of the airway, and they compli-
cate and may delay the delivery of rescue breaths.
Rescue Breathing
The first and most important treatment of the drowning
victim is the immediate provision of ventilation. Prompt
initiation of rescue breathing increases the victim’s chance of
survival.
10
Rescue breathing is usually performed when the
unresponsive victim is in shallow water or out of the water. If
it is difficult for the rescuer to pinch the victim’s nose,
support the head, and open the airway in the water, mouth-
to-nose ventilation may be used as an alternative to mouth-
to-mouth ventilation. Untrained rescuers should not try to
provide care while the victim is still in deep water.
Management of the drowning victim’s airway and breath-
ing is similar to that recommended for any victim of cardio-
pulmonary arrest. There is no need to clear the airway of
aspirated water, because only a modest amount of water is
aspirated by the majority of drowning victims and it is rapidly
absorbed into the central circulation, so it does not act as an
obstruction in the trachea.
5,11
Some victims aspirate nothing
because they develop laryngospasm or breath-holding.
5,12
Attempts to remove water from the breathing passages by any
means other than suction (eg, abdominal thrusts or the
Heimlich maneuver) are unnecessary and potentially danger-
(Circulation. 2005;112:IV-133-IV-135.)
? 2005 American Heart Association.
This special supplement to Circulation is freely available at
http://www.circulationaha.org
DOI: 10.1161/CIRCULATIONAHA.105.166565
IV-133
ous.
11
The routine use of abdominal thrusts or the Heimlich
maneuver for drowning victims is not recommended.
Chest Compressions
As soon as the unresponsive victim is removed from the
water, the rescuer should open the airway, check for breath-
ing, and if there is no breathing, give 2 rescue breaths that
make the chest rise (if this was not done in the water). After
delivery of 2 effective breaths, the lay rescuer should imme-
diately begin chest compressions and provide cycles of
compressions and ventilations. The healthcare provider
should check for a central pulse. The pulse may be difficult to
appreciate in a drowning victim, particularly if the victim is
cold. If the healthcare provider does not definitely feel a pulse
within 10 seconds, the healthcare provider should start cycles
of compressions and ventilations. Only trained rescuers
should try to provide chest compressions in the water.
Once the victim is out of the water, if the victim is
unresponsive and not breathing (and the healthcare provider
does not feel a pulse) after delivery of 2 rescue breaths,
rescuers should attach an AED and attempt defibrillation if a
shockable rhythm is identified. If hypothermia is present, see
Part 10.4.
Vomiting by the Victim During Resuscitation
The victim may vomit when the rescuer performs chest
compressions or rescue breathing. In fact, in a 10-year study
in Australia, two thirds of victims who received rescue
breathing and 86% of victims who required compressions and
ventilations vomited.
13
If vomiting occurs, turn the victim’s
mouth to the side and remove the vomitus using your finger,
a cloth, or suction. If spinal cord injury is possible, logroll the
victim so that the head, neck, and torso are turned as a unit.
Modifications to ACLS for Drowning
The drowning victim in cardiac arrest requires ACLS, includ-
ing early intubation. Every drowning victim, even one who
requires only minimal resuscitation before recovery, requires
monitored transport and evaluation at a medical facility.
Victims in cardiac arrest may present with asystole, pulse-
less electrical activity, or pulseless ventricular
tachycardia/ventricular fibrillation (VF). Follow the guide-
lines for pediatric advanced life support and ACLS for
treatment of these rhythms. Case reports document the use of
surfactant for fresh water–induced respiratory distress, but
further research is needed.
14–16
The use of extracorporeal
membrane oxygenation in young children with severe hypo-
thermia after submersion is documented in case reports.
8,17
There is insufficient evidence to support or refute the use of
barbiturates, steroids,
18
nitric oxide,
19
therapeutic hypother-
mia after return of spontaneous circulation,
20
or
vasopressin.
21
Improving Neurologic Outcomes:
Therapeutic Hypothermia
Recent randomized controlled trials (LOE 1)
22
and (LOE 2)
23
and subsequent consensus recommendations
24,25
support the
use of therapeutic hypothermia in patients who remain in a
coma after resuscitation from cardiac arrest caused by VF and
note that it may be effective for other causes of cardiac arrest.
However, the effectiveness of induced hypothermia for
drowning victims has not been established, and evaluation of
this approach is warranted. The 2002 World Congress on
Drowning recommended further studies to identify the best
treatments for drowning victims.
3
Summary
Prevention measures can reduce the incidence of drowning,
and immediate, high-quality bystander CPR and early BLS
care can improve survival. Rescue breathing should be
provided even before the victim is pulled from the water if
possible. Routine stabilization of the cervical spine is not
needed. Further studies are necessary to improve neurologic
outcome for drowning victims.
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Part 10.3: Drowning IV-135