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DOI: 10.1161/CIRCULATIONAHA.105.166555
2005;112;47-50; originally published online Nov 28, 2005; Circulation
Part 6: CPR Techniques and Devices
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Part 6: CPR Techniques and Devices
O
ver the past 25 years a variety of alternatives to standard
manual CPR have been developed in an effort to
improve ventilation or perfusion during cardiac arrest and
ultimately to improve survival. Compared with standard
CPR, these techniques and devices typically require more
personnel, training, or equipment, or they apply to a specific
setting. Maximum benefits are reported when adjuncts are
begun early in the treatment of cardiac arrest, so that the use
of these alternatives to CPR is often limited to the hospital
setting. To date no adjunct has consistently been shown to be
superior to standard manual CPR for out-of-hospital basic life
support, and no device other than a defibrillator has consis-
tently improved long-term survival from out-of-hospital car-
diac arrest. The data reported here is limited to clinical trials,
so most animal data is excluded from this section.
CPR Techniques
High-Frequency Chest Compressions
High-frequency (H11022100 per minute) manual or mechanical
chest compressions have been studied as a technique for
improving resuscitation from cardiac arrest.
1–4
The sparse
animal and human data available show mixed results. One
clinical trial of 9 patients showed that high-frequency (120
per minute) chest compressions improved hemodynamics
over standard CPR (LOE 4).
5
The use of high-frequency chest
compressions for cardiac arrest by adequately trained rescue
personnel can be considered, but there is insufficient evidence
to recommend for or against its use (Class Indeterminate).
Open-Chest CPR
No prospective randomized studies of open-chest CPR for
resuscitation have been published. Four relevant human
studies were reviewed: 2 were performed to treat in-hospital
cardiac arrest following cardiac surgery (LOE 4
6
; LOE 5
7
),
and 2 were performed after out-of-hospital cardiac arrest
(LOE 4
8
; LOE 5
9
). The observed benefits of open-chest
cardiac massage were improved coronary perfusion pressure
9
and increased return of spontaneous circulation (ROSC).
8
Open-chest CPR should be considered (Class IIa) for
patients with cardiac arrest in the early postoperative period
after cardiothoracic surgery or when the chest or abdomen is
already open (eg, in trauma surgery). For further information
about trauma resuscitation, see Part 10.7: “Special Resusci-
tation Situations: Cardiac Arrest Associated With Trauma.”
Interposed Abdominal Compression
The interposed abdominal compression (IAC)-CPR technique
uses a dedicated rescuer to provide manual compression of
the abdomen (midway between the xiphoid and the umbili-
cus) during the relaxation phase of chest compression. The
purpose is to enhance venous return during CPR.
10,11
When
IAC-CPR performed by trained providers was compared with
standard CPR for cardiac arrest in the in-hospital setting,
IAC-CPR improved ROSC and short-term survival in 2
randomized trials (LOE 1)
12,13
and improved survival to
hospital discharge in 1 study.
13
The data from these studies
was combined in 2 positive meta-analyses (LOE 1).
14,15
Evidence from 1 randomized controlled trial of out-of-
hospital cardiac arrest (LOE 2),
16
however, did not show any
survival advantage to IAC-CPR. Although there is 1 pediatric
case report
17
of complications, no harm was reported in the
other studies, which involved a total of 426 patients.
IAC-CPR may be considered during in-hospital resuscita-
tion when sufficient personnel trained in its use are available
(Class IIb). There is insufficient evidence to recommend for
or against the use of IAC-CPR in the out-of-hospital setting
(Class Indeterminate).
“Cough” CPR
“Cough” CPR is not useful for the treatment of an unrespon-
sive victim,
18–23
and it should not be taught to lay rescuers.
Human “cough” CPR has been reported only in awake,
monitored patients who developed ventricular fibrillation
(VF) or rapid ventricular tachycardia (VT).
20,22,24
Several
small case series (LOE 5)
18,20,22,24
reporting experiences in
the cardiac catheterization suite suggest that repeated cough-
ing every 1 to 3 seconds during episodes of VF or rapid VT
by conscious, supine, monitored patients trained in the
technique can maintain a mean arterial pressure
H11022100 mm Hg and can maintain consciousness for up to 90
seconds.
The increase in intrathoracic pressure that occurs with
coughing generates blood flow to the brain and helps main-
tain consciousness. Coughing every 1 to 3 seconds for up to
90 seconds after the onset of VF or pulseless VT is safe and
effective only in conscious, supine, monitored patients previ-
ously trained to perform this maneuver (Class IIb). Defibrillation
remains the treatment of choice for VF or pulseless VT.
CPR Devices
Devices to Assist Ventilation
Automatic and Mechanical Transport Ventilators
Automatic transport ventilators (ATVs). One prospective
cohort study of 73 intubated patients, most of whom were in
cardiac arrest, in an out-of-hospital urban setting showed no
difference in arterial blood gas parameters between those
ventilated with an ATV and those ventilated with a bag-mask
device (LOE 4).
25
Disadvantages of ATVs include the need
for an oxygen source and electric power. Thus, providers
should always have a bag-mask device available for manual
backup. Some ATVs may be inappropriate for use in children
H110215 years of age.
(Circulation. 2005;112:IV-47-IV-50.)
? 2005 American Heart Association.
This special supplement to Circulation is freely available at
http://www.circulationaha.org
DOI: 10.1161/CIRCULATIONAHA.105.166555
IV-47
In both the out-of-hospital and in-hospital settings, ATVs
are useful for ventilation of adult patients with a pulse who
have an advanced airway (eg, endotracheal tube, esophageal-
tracheal combitube [Combitube], or laryngeal mask airway
[LMA]) in place (Class IIa). For the adult cardiac arrest
patient who does not have an advanced airway in place, the
ATV may be useful if tidal volumes are delivered by a
flow-controlled, time-cycled ventilator without positive end-
expiratory pressure (PEEP). If the ATV has adjustable output
control valves, tidal volume should be adjusted to make the
chest rise (approximately 6 to 7 mL/kg or 500 to 600 mL),
with breaths delivered over 1 second. Until an advanced
airway is in place, an additional rescuer should provide
cricoid pressure to reduce the risk of gastric inflation. Once
an advanced airway is in place, the ventilation rate should be
8 to 10 breaths per minute during CPR.
Manually triggered, oxygen-powered, flow-limited resus-
citators. In a study of 104 anesthetized nonarrest patients
without an advanced airway in place (ie, no endotracheal
tube; patients were ventilated through a mask), patients
ventilated by firefighters with manually triggered, oxygen-
powered, flow-limited resuscitators had less gastric inflation
than those ventilated with a bag-mask device (LOE 5).
26
Manually triggered, oxygen-powered, flow-limited resuscita-
tors may be considered for the management of patients who
do not have an advanced airway in place and for whom a
mask is being used for ventilation during CPR. Rescuers
should avoid using the automatic mode of the oxygen-
powered, flow-limited resuscitator because it applies contin-
uous PEEP that is likely to impede cardiac output during
chest compressions (Class III).
Devices to Support Circulation
Active Compression-Decompression CPR
Active compression-decompression CPR (ACD-CPR) is per-
formed with a hand-held device equipped with a suction cup
to actively lift the anterior chest during decompression. It is
thought that decreasing intrathoracic pressure during the
decompression phase enhances venous return to the heart. As
of 2005 no ACD-CPR devices have been cleared by the Food
and Drug Administration for sale in the United States.
Results from the use of ACD-CPR have been mixed. In 4
randomized studies (LOE 1
27,28
; LOE 2
29,30
) ACD-CPR
improved long-term survival rates when it was used by
adequately trained providers for patients with cardiac arrest in
the out-of-hospital
27,28
and in-hospital
29,30
settings. In 5 other
randomized studies (LOE 1
31–34
; LOE 2
35
), however, no
positive or negative effects were observed. In 4 clinical
studies (LOE 3)
30,36–38
ACD-CPR improved hemodynamics
over standard CPR, and in 1 clinical study (LOE 3)
39
did not.
Frequent training seems to be a significant factor in achieving
efficacy.
28
A meta-analysis of 10 trials involving 4162 patients in the
out-of-hospital setting (LOE 1)
40
and a meta-analysis of 2
trials in the in-hospital setting (826 patients)
40
failed to
document any early or late survival benefit of ACD-CPR over
conventional CPR. The out-of-hospital meta-analysis found a
large but nonsignificant worsening in neurologic outcome in
survivors in the ACD-CPR group, and 1 small study
41
showed
increased incidence of sternal fractures in the ACD-CPR
group.
ACD-CPR may be considered for use in the in-hospital
setting when providers are adequately trained (Class IIb).
There is insufficient evidence to recommend for or against
the use of ACD-CPR in the prehospital setting (Class
Indeterminate).
Impedance Threshold Device
The impedance threshold device (ITD) is a valve that limits
air entry into the lungs during chest recoil between chest
compressions. It is designed to reduce intrathoracic pressure
and enhance venous return to the heart. In initial studies the
ITD was used with a cuffed endotracheal tube during bag-
tube ventilation and ACD-CPR.
42–44
The ITD and ACD
device are thought to act synergistically to enhance venous
return during active decompression.
In recent reports the ITD has been used during conven-
tional CPR
45,46
with an endotracheal tube or face mask.
Studies suggest that when the ITD is used with a face mask,
it may create the same negative intratracheal pressure as use
of the ITD with an endotracheal tube if rescuers can maintain
a tight face mask seal.
43,45,46
In 2 randomized studies (LOE 1)
44,47
of 610 adults in
cardiac arrest in the out-of-hospital setting, use of ACD-CPR
plus the ITD was associated with improved ROSC and
24-hour survival rates when compared with use of standard
CPR alone. A randomized study of 230 adults documented
increased admission to the intensive care unit and 24-hour
survival (LOE 2)
45
when an ITD was used during standard
CPR in patients in cardiac arrest (pulseless electrical activity
only) in the out-of-hospital setting. The addition of the ITD
was associated with improved hemodynamics during stan-
dard CPR in 1 clinical study (LOE 2).
46
Although increased long-term survival rates have not been
documented, when the ITD is used by trained personnel as an
adjunct to CPR in intubated adult cardiac arrest patients, it
can improve hemodynamic parameters and ROSC (Class IIa).
Mechanical Piston Device
The mechanical piston device depresses the sternum via a
compressed gas-powered plunger mounted on a backboard. In
1 prospective randomized study and 2 prospective random-
ized crossover studies in adults (LOE 2),
48–50
mechanical
piston CPR used by medical and paramedical personnel
improved end-tidal CO
2
and mean arterial pressure in patients
in cardiac arrest in both the out-of-hospital and in-hospital
settings.
Mechanical piston CPR may be considered for patients in
cardiac arrest in circumstances that make manual resuscita-
tion difficult (Class IIb). The device should be programmed
to deliver standard CPR with adequate compression depth at
the rate of 100 compressions per minute with a compression-
ventilation ratio of 30:2 (until an advanced airway is in place)
and a compression duration that is 50% of the compression-
decompression cycle length. The device should allow com-
plete chest wall recoil.
Load-Distributing Band CPR or Vest CPR
The load-distributing band (LDB) is a circumferential chest
compression device composed of a pneumatically or electri-
IV-48 Circulation December 13, 2005
cally actuated constricting band and backboard. Evidence
from a case control study of 162 adults (LOE 4)
51
docu-
mented improvement in survival to the emergency depart-
ment when LDB-CPR was administered by adequately
trained rescue personnel to patients with cardiac arrest in the
out-of-hospital setting. The use of LDB-CPR improved he-
modynamics in 1 in-hospital study of end-stage patients
(LOE 3)
52
and 2 laboratory studies (LOE 6).
53,54
LDB-CPR
may be considered for use by properly trained personnel as an
adjunct to CPR for patients with cardiac arrest in the
out-of-hospital or in-hospital setting (Class IIb).
Phased Thoracic-Abdominal Compression-Decompression
CPR With a Hand-Held Device
Phased thoracic-abdominal compression-decompression CPR
(PTACD-CPR) combines the concepts of IAC-CPR and
ACD-CPR. A hand-held device alternates chest compression
and abdominal decompression with chest decompression and
abdominal compression. Evidence from 1 prospective ran-
domized clinical study of adults in cardiac arrest (LOE 2)
55
documented no improvement in survival rates with use of
PTACD-CPR for assistance of circulation during advanced
cardiovascular life support (ACLS) in the out-of-hospital and
in-hospital settings. Thus, there is insufficient evidence to
support the use of PTACD-CPR outside the research setting
(Class Indeterminate).
Extracorporeal Techniques and Invasive
Perfusion Devices
Much of the literature showing the effectiveness of extracor-
poreal CPR (ECPR) includes patients with cardiac disease.
ECPR is more successful in postcardiotomy patients than in
those with cardiac arrest from other causes (LOE 5).
56
ECPR
may be particularly effective for these patients because they
are more likely to have a reversible (ie, surgically correctable
or short-term) cause of cardiac arrest, and typically they
suffer cardiac arrest without preceding multisystem organ
failure.
ECPR for induction of hypothermia has been shown to
improve survival rates in a small study of patients who
arrived at the ED in cardiac arrest and failed to respond to
standard ACLS techniques (LOE 5).
57
ECPR should be considered for in-hospital patients in
cardiac arrest when the duration of the no-flow arrest is brief
and the condition leading to the cardiac arrest is reversible
(eg, hypothermia or drug intoxication) or amenable to heart
transplantation or revascularization (Class IIb).
58,59
Summary
A variety of CPR techniques and devices may improve
hemodynamics or short-term survival when used by well-
trained providers in selected patients. To date no adjunct has
consistently been shown to be superior to standard manual
CPR for out-of-hospital basic life support, and no device
other than a defibrillator has consistently improved long-term
survival from out-of-hospital cardiac arrest.
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