VF Pulseless VT Case
VF Pulseless VT Case
VF Pulseless VT Case
Introduction This case focuses on The assessment and actions used tor a cardiac arrest due to vF or
. <
puseless VT mat s r ‘hactc ry unresponsive ) to the rirst shock
tn this case and during the course you will have an opportunity to demonstrate effec
five high- performance team behaviors while performing the assessment and acTion
. .
skills During the BLS Assessment Team members will perform continuous high -quality
CPR with effective chest compressions and ventilation. The team leader will conduct the
Primary Assessment , including rhythm recognition ( shockabie versus nonshockablo), defi-
brination using a manual deftbnllator, resuscitation drugs, a discussion of IV/intraos&eous
(10) access and advanced airways
,
The success of any resuscitation attempt is built on a strong base of hrqh - quality CPR and
defibrillation when required by the patient 's ECG rhythm. To improve care , leaders must
assess the performance of each system component . Only when performance is evaluated
can participants in a system effectively intervene to improve care This process of quality
improvement cons uls of an iterative and continuous cycle of
mg chest compressions
Chest compression fraction (CCF ) is the proportion of time during cardiac arrest resuscita
tion when chest compressions are performed. CCF should be as high as possible at least,
60% and ideally greater than 80%. Data suggest lower CCF is associated with decreased
ROSC and survival to hospital discharge
Measurement Quality improvement relies on valid assessment of resuscitation performance and outcome
* The Ulstem guidelines provide guidance for core performance measures including
,
Benchmarking and Data should be systematically reviewed anti compared internally to prior performance and
Feedback externally to similar systems. Existing registries can facilitate this benchmarking effort
Examples include the
02
The ACLS Cases: Cardiac Arrest: VF / Pulseless VT
Change Simply measuring and benchmarking care can positively influence outcome . However,
ongoing review and interpretation are necessary to identify areas for improvement, s jch as
• Citizen awareness
• Citizen and healthcare professional education and training
Increased bystander CPR response rates
Improved CPR performance
« Shortened time to defibfiliation
Overview The Adult Cardiac Arrest Algorithm (Figure 31) is the most important algorithm to know
for adult resuscitation. This algorithm outlines all assessment and management steps for
the pulseless patient who does not initially respond to BLS interventions, including first
a
:
shock from an AED. The algorithm consists Of the 2 pathways tor a cardiac arrest
A shockable rhythm (VF/pulseless VT ) displayed on the left side of the algorithm
• A nonshockable rhythm (asystole /PEA) displayed on the right side of the algorithm
Throughout the case discussion of the Cardiac Arrest Algorithm, we will refer to Steps
1
through 12. These are the numbers assigned to the steps in the algorithm.
VF/ pVT (Left Side ) Because many patients with sudden cardiac arrest demonstrate VF at some point in their
arrest , it is likely that ACLS providers will frequently follow the left side of the Cardiac
Arrest Algorithm (Figure 31) . Rapid treatment of VF according to this sequence is the best
approach to restoring spontaneous circulation.
Asystole / PEA 1ne right side of the algorithm outlines the sequence of actions to perform if the rhythm is
(Right Side ) ronshockabie . You will have an opportunity to practice this sequence in tne Asystole and
PEA Cases.
Summary Tne VF/Pulseless VT Case gives you the opportunity to practice performing rapid treat *
ment of VF /pVT by Following the steps on the left side of the Cardiac Arrest Algorithm
(Steps 1 through 8).
L. VF / pVT 9
Asystole /PEA -
Lc hripruyn CPR qunlirv
-
ir HfcTCO -.10 mil! Sflg, afiempt
-
3&sa Ol 1.20 200 J|i; > unknown *
ir
at
*: urdx rmm JiuBilniru©
Sitowwl end sdiaseoueri aosra
•
WillvnForm C Eipno&'aphy ur
I T to HlfilSrm and
Rhythm No Rhythm Yea nonlor IU lutm pincemanl
shockable? OTICB nrtmnoed aiway n place
shockable? / spua i breath every 6 Ksnnnris
*
iROSC), go to 10 or 11 * Tamponade curdi -ir; .
* H ROSC, go to * Toxins
8 Tirj’nLKxiia pulmonary
Q 3P15 American Hnnrf Asaociebon
Pcs! Cam c Arrest Care
^ - * TVirorniKKir oomnary .
Figure 31 . Tne Adult Cardiac Arrest Algorithm .
94
The ACLS Cases: Cardiac Arrest: VF / Puiseiess VT
Introduction This esse discusses the assessment end treatment of a patient with refractory VF or
.
pulse ess VT This algonthm assumes that healthcare providers have completed the BLS
Assessment, including activation of the emergency response system, performing CPR,
attaching the manual defibrillator; and delivering the first shock ( Steps 1 through 4).
The ACLS high-performance team now intervenes and conducts the Primary Assessment .
In thus case, the team assesses the patient and takes actions as needed. The team leader
coordinates the efforts of the high - performance team as they perform the steps listed in
the VF/ pVT pathway on the left side of the Cardiac Arrest Algorithm.
Minimal Interruption A team member should continue to perform high- quality CPR until the defibrillator arrives
of Chest and is attached to the patient. The team leader assigns roles and responsibilities and
Compressions organizes interventions to minimize interruptions in chest compressions. This accomplish -
es the most critical interventions for VF or pulseless VT: CPR with minimal interruptions in
chest compressions and defibrination during the first minutes of arrest.
The AHA does not recommend continued use of an AED {or the automatic mode) when
a manual defibrillator is available and the provider 's skills are adequate for rhythm inter-
pretation. Rhythm analysis and shock administration with an AED may result in prolonged
interruptions in chest compressions.
Figure 32 demonstrates the neeo to minimize interrupt ons in compressions. GPP is aortic
relaxation {"diastolic ") pressure minus right atrial relaxation (“ diastolic ") pressure. During
CPR , CPP correlates with both myocardial blood flow and ROSC , In 1 human study,
ROSC did not occur unless a CPP 15 mm Hg or greater was achieved during CPR .
A Adequate
Adequate
CPP Level
1CPP Level
i
Figure 32. Relationship of quality CPR to coronary perfusior pressure {CPP) demonstrating the need to minimize interruptions
in compressions.
95
Foundational Facts Resume CPR While Manual Defibrillator Is Charging
H Shortening ihe interval between the last compression and the shock by even a tew
seconds can improve shock success ( defibrination and RGSC ). Thus , it is reasonable
for healthcare providers to practice efficient coordination between CPR and defibrina -
tion to minimize the hands -off interval between stopping compressions and adminis -
tering the shock .
* For example after verifying a shockable rhythm and initiating the charging sequence
,
on the defibrillator, another provider should resume chest compressions and continue
until the defibrillator is fully charged. The defibrillator operator should deliver the shock
as soon as the compressor removes his or her hands from the patient 's chest and all
providers are ' clear ' of contact with the patient
'
"
.
* Use of a multimodal defibrillator in manual mode may reduce the duration of chest
compression interruption required for rhythm analysis compared with automatic mode
but could increase the frequency of inappropriate shocK . Individuals who are not com-
fortable interpreting cardiac rhythms can continue to use an AEP.
*
recommendations,
-
For an AED . follow the device 's prompts or know your device specific manufacturer 's
Deliver 1 Shock Step 3 directs you to deliver 1 shock . The appropriate energy dose is determined by
the identity of the defibrillator — monophasic or diphasic. See the column on the right of
the algorithm .
If you are using a monophasic defibrillator, give a single 360-3 shock. Use the same
energy dose for subsequent shocks.
Btphastc defibrillators use a variety of waveforms each of which is effective for terminat -
,
ing VF over a specific dose range. When using biphasic defibnHaters, providers should
use the manufacturer 's recommended energy dose ( eg, initial dose of 120 to 200 J), Many
biphasic defsbnllator manufacturers display the effective energy dose range on the face of
the device. If you do not know the effective dose range, deliver the maximal energy dose
for the first and all subsequent shocks.
If the initial shock terminates VF but the arrhythmia recurs later in the resuscitation
attempt , deliver subsequent shocks at the previously successful energy level .
Immediately after the shock; resume CPR, beginning with chest compres-
sions. Give 2 minutes of CPR.
Purpose of Defibrillation does not restart the heart . Defibrillation stuns the heart and briefly terminates
Defibrillation all electrical activity, including VF and pVT. It the heart is still viable , its normal pacemak -
ers may eventually resume electrical activity (return of spontaneous rhythm ) that ultimately
results in a perfusing rhythm fROSC) .
In the First minutes after successful defibfillatron, however, any spontaneous rhythm is typi-
cally slow and may not create pulses or adequate perfusion. The patient needs CPR ( begin-
ning with chest compressions) for several minutes until adequate heart function resumes.
Moreover, not aN shocks wil lead to successful defibrillation. This is why it is important to
resume high - quality CPR , beginning with chest compressions immediately after a shock .
96
The ACLS Cases: Cardiac Arrest: VF / Pulseless VT
Principle of Early The interval from collapse to defibrillation is one of the most important determinants of
Defibrillation survival from cardiac arrest. Early defibrillation is critical for patients with sudden cardiac
arrest for the following reasons:
• A common initial rhythm in out -of - hospital witnessed sudden cardiac arrest is VF .
For every minute that passes between collapse and defibrination, the chance of survival
from a witnessed VF sudden cardiac arrest declines by 7 % to 10% per minute if no
.
bystander CPR is provided " When bystanders perform CPR , the decline is more gradual
and averages 3% to 4 % per minute /" CPR performed early can double17 or triple?
survival from witnessed sudden cardiac arrest at most defibriNation intervals.
Lay rescuer AED programs increase the likelihood of early CPR and attempted defibrina-
tion. This helps shorten the time between collapse and defibriNation for a greater number
of patents with sudden cardiac arrest.
100
90
80
70
>
£ 60
A
•sp
50
^ 40
30
20 i —
10 M —
D
1 2 3 A 5 6 7 8 9 10
Time (min)
.
Figure 33 Relationship between survival from ventricular fibrillation sudden cardiac arrest and time from
collapse to defibrination.
97
P a r t
m
Foundational Facts Clearing for Defibrillation
To ensure safety during defibrination, always announce the shock warning State the .
warning firmly and in a torest uI voice before delivering each shock {tbs entire sequence
should take less than 5 seconds}:
* “ Clear. Shocking. ’
1
- Check to make sure you are clear of contact with the patient, the stretcher, or other
equipment.
- Make a visual check to ensure that no one is touching the patient or stretcher.
- Be sure oxygen is not flowing across the patient ’s chest,
* When pressing the shock buttonr the defibrillator operator should face the patient,
not the machine. This helps to ensure coordination with the chest compressor and to
verify that no one resumed contact with the patient.
YOJ do not need to use these exact words, but you must warn others that you are about
to deliver shocks and that everyone must stand clear of the patient.
Team
A
+ Rescue
Sresths k 30:2 CPR
k
Figure 34 , Progression from lay rescuers la highly trained healthcare providers \ nr CPR delivery.
98
The ACLS Cases: Cardiac Arrest: VF / Pulseless VT
Rhythm Check Conduct a rhythm check after 2 minutes of CPR . Be careful to minimize interruptions in
chest compressions.
The pause in chest compressions to check the rhythm should not exceed
10 seconds.
• Ifa nonshockable rhythm is present and the rhythm is organized, a team member
should try to palpate a pulse. If there is any doubt about the presence of a pulse,
immediately resume CPR
Remember: Perform a pulse check — preferably during rhythm analysis — only if an
organized rhythm * s present.
• It the rhythm check reveals a nonshockable rhythm and there is no pulse , proceed
along the asystole/ PEA pathway on the right side of the Cardiac Arrest Algorithm
(Steps 9 through 11).
• If the rhythm check reveals a shockable rhythm, give 1 shock and resume CPR imme-
diately for 2 minutes after the shook ( Step 6).
Self - Adhesive Pads The AHA recommends routine use of self -adhesive pads . Using conductive materials (gel
pads or self -adhesive pads) during the defibrillation attempt reduces transthoracic imped -
ance , or the resistance that chest structures have on electrical current.
Shock and For persistent VF/pulseless V", give 1 shock and resume CPR immediately tor 2 minutes
Vasopressors after the shock .
Immediately after the shockt resume CPR, beginning with chest compres -
sions. Give 2 minutes of CPR.
When IV /IO access is available, give epinephrine during CPR after the second shock
as follows:
« Epinephrine 1 —
mg IV /IO repeat every 3 to 5 minutes
Note : If additional team members are available , they should anticipate the need for drugs
and prepare them in advance
The 2075 AHA Guidelines Update for CPR and ECC states that "vasopressin offers
nn advantage as a substitute for epinephrine in cardiac arrest . ' As such, it has been
’
99
P a r t
Rhythm Check Conduct a rhythm check a*ter 2 minutes of CPR . Be careful to minimize interruptions in
chest compressions.
Shock and Give 1 shock and resume CPR beginning with chest compressions for 2 minutes immedi -
Antiarrhythmics ately after the shock .
Healthcare providers may consider giving antiarrhythmic drugs, either before or after the
shock . Research is still lacking on the effect of antiarrhythmic drugs given during cardiac
arrest on survival to hospital discharge. If administered, amiodarone is the first - line antiar-
rhythmic agent given in cardiac arrest because it; has been clinically demonstrated that it
improves the rate of ROSC and hospital admission in adults with refractory VF /pulscless VT.
• Amiodarone 300 mg IV /IO bolus, then consider an additional 150 mg IV/ IO once
- Amiodarone is considered a class III antiarrhythmic drug, but it possesses elec -
trophy siologic characteristics of the other classes. Amiodarone blocks sodium
channels at rapid pacing frequencies (class I effect) and exerts a noncompetitive
antisympathetic action (class II effect). One of the main effects of prolonged amio -
darone administration is lengthening of the cardiac action potential (class III effect) .
If amiodarone is noi available, providers may administer lidocaine .
• Lidocaine 1 to 1 5 mg/kg IV/IO first dose, then 0.5 to 0.75 mg/kg IV /IO at 5
, ^ to
10-minute intervals, to a maximum dose of 3 mg/kg
- Lidocaine suppresses automahcfty of conduction tissue in the heart , by increasing
the electrical stimulation threshold of the ventricle, His-Purkmje system, and
spontaneous depolarization of the ventricles during diastole by a direct action on
the tissues.
- Lidocaine blocks permeability of the neuronal membrane to sodium ions, which
results in inhibition of depolarization and the blockade of conduction.
Providers should consider magnesium sulfate for torsades de poirites associated with a
long QT interval .
• Magnesium sulfate for torsades de poirues loading dose 1 to 2 g IWIO diluted in
;
1 D mL [eg, D,W. normal saline) given as IV /IO dolus , typically over 5 to 20 minutes
- Magnes 'um can be classified as a sodFum/potassium pump agonist
-
- Vlagnes um has several el ectrophysio logical effects including suppression of atrial
,
Search for and treat any treatable underlying cause of cardiac arrest . See the column on
the right ot the algorithm. See Table 4 in Part A for more information on the H’s and T’s .
100
The ACLS Cases: Cardiac Arrest: VF / Pulseless VT
Cardiac Arrest The Adult Cardiac Arrest Circular Algorithm (Figure 35 } summarizes ihe recommended
Treatment sequence of CPR , rhythm checks , shocks - and delivery of drugs basket on expert con-
Sequences sensus The optimal number of cycles of CPR and shocks required before starting phar
macologc therapy remains unknown. Not © that rhythm checks and shocks are organized
around 5 cycles of compressions and ventilations, or 2 minutes if a provider is timing
the arrest
chest reco*
.
* Mrumize interruptions in ff mpre-hs^yis
* Avod excessive vanbabar
Rotate compressor ewry 2 minutes LH auur r (tii u»d
-
»
Start CPR
* Ifno advanced airway WJ 2 compfe isior V ^MIMH n r ilKi
^.
Give oxygen
•Attach monitof / dofjbhHaiorJ * Quarflftaiive waveform capnography
- if Ptrco. ^10 mm Hg, attempt to improve CRR quality
2m u«,„
* J "risr * tnlra-artgrigl pressure
-
- If relaxation plias# (diastolic) pressure 20 rum Hy attempt to
improve CPR quality
^^^^
Post-Cardiac
Shock Energy for Delitoriffcation
TRhythmJiBBi
^^^ ^^
Arrest Care
j
.
* Bipha &ic: Maniifactirffii recomw idatum IOIJ , rnti ii IOM ul 15' IJ :* CK.J J) .
if unknown, use maximu n available Second uud ii dunr,
should ne equivalent , and higher dose may t i i ui <dor » 1 *
Drug Therapy Moriuphasic: 360 J
* * .
^
ET tuoe piacerr^rt
^
Treat Reversible Causes
*
t 1 C bnsuthsrtran)
- -.
Oce advanced ^a,: \ pU: LJ V * 1 tyr iti
continuous ChnsJ campwwidftx
, . •. :
. .
Figure 35 the Adult Carduu: Arrest Circular Algorithm Do no delay shock . Continue
CPR wh«le preparing and admirHMMfinij diug i mil t' orqinq -
*
the defibrillator intenupi chest comprwtHons only for ihe minimum amount of time
required lor ventilation (until advanced a i r p l a c e d), rhythm
check, and actual shock delivery
101
P a r t
Physiologic The AHA recommends using quantitative waveform capnography in intubated patients to
Monitoring During mon tor CPR quality ( Figure 36) , optimize chest compressions, and detect ROSC during
CPR chest compressions \ Figure 37). Although placement of invasive monitors during CPR is
not generally warranted physiologic parameters such as intra - arterial relaxation pressures
( Figures 36A and B ) and central venous oxygen saturation (Scvo ). when available, may
Animal and human studies indicate that PFTCO; CPP and S v monitoring provides valu-
able information on Doth the patient 's condition and the response to therapy Most impor
tant Pi Tec CPP and Se e correlate with cardiac output and myocardial blood flow
during CPR When chest compressions fail to achieve identified threshold values. ROSC is
.
rarely achieved Furthermore, an abrupt increase in any of these parameters is a sensitive
indicator ot ROSC that can be monitored without interrupting chest compressions
-
Although no clinical study has examined whether titrating resuscitative etlorls to physi
ologic parameters improves outcome, it is reasonable to use these parameters, if available ,
Pnd - Ttdal C 02
Th* mam determinant of PHC:_ O - dunng CPR is blood delivery to the lungs Persistently low
Pi T i ' j values less than 10 mm Hg during CPR in Intubated patients (Figure 368) suggesl
that ROSC Is unlikely. If PETOQ abruptly increases to a normal value of 35 to 40 mm Hg it
* .
is reasonable to consider this an indicator of ROSC
102
The ACLS Cases: Cardiac Arrest: VF / Pulseless VT
SO :
X 40
E
E
2C
:
a
1: V
Tune
120 r
A
r
no
CS
_ 4in
iJ i
fc
E f
20
10
D y
“
VJ s* \
Time
120
E
40
za
0
B
waveform capnography ard intra - arterial relax -
Figure 36 » Physiologic mentoring during CPn A, High-quality compressions are shown through
intubated patients or intra arterial relaxation pressures less than 20 mm I Ig rd cate that
ation pressure PETCO. values less than 1D mm Hg m
trying to improve aoahty of CPR by optimizing
cardiac output is inadequate to achieve ROSG la either ot fho&a cases, IT IS reasonaole to consider
chest compression parameters or giving a vasopressor Q * Doth 0, Ineffective CRH compressions shown through intra arterial relaxation pressure
and waveform capnography,
103
1 minute iterva
i
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=£ 37.5
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12.5
0 * -B J1 .
•
CPH ROSC
Figure 37. Waveform capnography during CPR with ROSC . This capnography tracing
displays PETCO2 in millimeters ot mercury on the vertical axjs over time. This patient is
intubated and receiving CPR. Note that the ventilation rate is approximately 10/mrn. Chest
compressions are given continuously at a rate slightly faster than 100/min but are not vis -
ible with this tracing. The initial PETCO, IS less than 12.5 mm Hg during the first minute,
indicating very low blood flow. PETCO, increases to between 12.5 and 25 mm Hg during
the second and third minutes, consistent with the increase in blood flow with ongoing
resuscitation. ROSC occurs during the fourth minute. ROSC is recognized by the abrupt
increase in Prrccr . ( visible just after the fourth vertical line ) to greater than 50 mm Hq,
which is consistent with a substantia! improvement in blood flow .
Treatment Of VF/ pVT Defibrillation is appropriate for the cardiac arrest patient in VF/pVT who has severe hypo-
in Hypothermia thermia and a body temperature of less than 30 "C ( less than B 6 F). It the patient does not
::
ACLS treatment of the patient with severe hypothermia in cardiac arrest in the hospital
should be armed at rapid core re warming.
For patients in cardiac arrest with moderate hypothermia (3Q C to 34;C [86 F to 93 . ?°F]}
"
.
start CPR attempt defibrillation, give medications spaced at longer intervals, and, t in
hospital, provide active core rewarming
Priorities .
Priorities during cardiac arrest are high-quality CPH and early defibrination Insertion of
an advanced airway and drug administration are of secondary importance. No drug given
during cardiac arrest has been studied adequately to show improved survival to hospital
discharge or improved neurologic function after cardiac arrest.
Historically in ACLS , providers have administered drugs either v < a the IV or ET route. FT
absorption of drugs is poor and optimal drug dosing is not known. For this reason, the IV
or JO route is preferred.
Intravenous Route A peripheral IV is preferred lor drug and fluid administration unless central line access is
already available .
Central line access is not necessary during most resuscitation attempts. Central line access
may cause interruptions in CPR and complications during insertion, including vascular lac -
eration, hematomas, and bleeding , Insertion of a central line in a noncompressible vessel is
a relative {not absolute) contraindication to fibrinolytic therapy in patients with ACS .
104
The ACLS Cases: Cardiac Arrest: VF!Pulseless VT
Establishing a peripheral line does not require interruption of CPR, Drugs, however, typi-
cally require 1 to 2 minutes to reach the central circulation when given by the peripheral
IV route.
Intraosseous Route Drugs and fluids during resuscitation can be delivered safely and effectively vta the IO
route if IV access is not available. Important points about 10 access are
blood during resuscitation. The technique uses a rigid needle, preferably a specially
designed 10 or bone marrow needle from an IO access kit .
For more information on 10 access , see the Access for Medications section on
the Student Website ( www.heart.org / eccstudent ) .
Endotracheal Route IV and 10 administration routes are preferred over the ET administration route. When
considering administration of drugs via the ET route during CPR , keep these concepts in
mind:
Fluid Administration Healthcare providers should titrate fluid administration and vasoactive or inotropic agents
as needed to optimize blood pressure cardiac output and systemic perfusion, Tne opti-
, ,
mal post-cardiac arrest blood pressure remains unknown; however, a mean arterial pres -
sure 65 mm Hg or greater is a reasonable goal
In hypovolemic patients, the ECF volume « s typically restored with normal saline or lactated
Ringer s solution. Avoid D,W because it will reduce serum sodium too rapidly. Serum elec -
'
Vasopressors
Introduction While there is evidence that the use of vasopressors favors initial resuscitation with RGSC ,
research is still lacking on the effect of ttie routine use of vasopressors at any stage during
management of cardiac arrest on the rates of survival to hospital discharge .
105
Vasopressors Vasopressors optimize cardiac output and blood pressure. The vasopressor used during
Used During cardiac arrest ss
Cardiac Arrest Epinephrine; 1 mg IV/IO (repeat every 3 to 5 minutes)
If IV /IO access cannot be established or is delayed, give epinephrine 2 to 2 , 5 mg diluted
in b to 10 mL ot sterile water or normal saline arid injected directly into the ET tube.
Remember, the FT route of drug administration results in variable and unpredictable drug
absorption and blood levels.
Epinephrine Although healthcare providers have usee epinephrine for years in resuscitation few studies
,
have been conducted to address the questron of whether it improves outcome in humans.
Epinephrine administration improves ROSC and hospital admission rates: however, large
studies have not been conducted to evaluate whether survival is improved. Because there
are no large studies to confirm longer-term outcome, we rely on the positive short - term
effects of increased ROSC and increased hospital admission to support the use in car-
diac arrest - No studies demonstrate improved rates of survival to hospital discharge or
neurologic outcome when comparing standard epinephrine doses with initial high- dose or
escalating-dose epinephrine. Therefore , the AHA does not recommend the routine use of
high - dose or escalating doses ot epinephrine.
Antiarrhythmic Agents
Introduction As with vasopressors, research is still lacking on the effect ot routine antiarrhythmic
drug administration during human cardiac arrest and survival to hospital discharge.
Amiodarone. however , has been shown to increase short - term survival to hospital admis -
sion when compared with placebo or lidocaine.
106
The ACLS Cases: Cardiac Arrest: VF / Pulseless VT
Magnesium Sulfate • IV magnesium may terminate or prevent recurrent torsades de pointes in patients who
have a prolonged QT interval during normal sinus rhythm. When VF/pulseless VT car-
diac arrest is associated with torsades de pointes. give magnesium sulfate at a load -
ing dose of 1 to 2 g IV/IG diluted in 10 rnL (eg, D! W, normal saline) given ever 5 to
;
20 minutes . It a prearrest 12 - lead EGG is available for review check the QT interval
,
for prolongation.
Remember that pulseless VT is treated with an immediate high-energy snock, where-
as magnesium is an adjunctive agent used to prevent recurrent or treat persistent VT
associated with torsades de pointes.
Magnesium sulfate is also indicated for patients with known or suspected low serum
magnesium, such as patients wrth alcoholism or other conditions associated with
malnutrition or hypomagnesemia states. For patients in refractory VF/pulseless VT,
check the patient 's history, if available, for one of these conditions that suggests the
presence of a reversible electrolyte abnormality.
Steroids in * The use of steroids m cardiac arrest has been assessea in both the out -of -hospital
Cardiac Arrest and in-hospital settings , in IHCA , steroids were combined with a vasopressor bundle
or cocktail of epinephrine and vasopressin .
* an initial randomized controlled trial (RCT) involving 100 IHCA patients, the use of
In
a combination of methylprednisolone, vasopressin, and epinephrine during cardiac
arrest and hydrocortisone after RQSC for those with shock significantly improved sur -
vival to hospital discharge compared with the use of only epinephrine and placebo.9
,|
In a subsequent study published in 2013 , : 136 in 268 patients with IHCA. the same
combination of methylprednisolone, vasopressin, and epinephrine during cardiac
arrest (and hydrocortisone in those with post - ROSC shock ), significantly improved the
survival to discharge with good neurologic outcome compared with only epinephrine
and placebo.
The same 2 RCTs provided evidence that the use of methylprednisolone and vaso -
pressin in addition to epinephrine improved ROSC rates compared with the use of
placebo and epinephrine alone.
.
* In OHCA steroids have been evaluated in 1 RCT and 1 observational study. In
these studies, steroids were not bundled as they were in the IHCA but studied as
a sole treatment. When dexamethasone was given during cardiac arrest , it did not
improve survival to hospital discharge or ROSC or survival to discharge, as compared
with placebo The observational study showed no benefit in survival to discharge
but did show an association of improved RQSC with hydrocortisone compared with
no hydrocortisone.
* In kght of the data presented , no recommendation can be made on the routine use
of steroids alone in IHCA However, the combination of intra- arrest vasopressin epi ,
-
nephrine . and methylprednisolone and postarrest hydrocortisone may be consdered
for IHCA patients.
* For OHCA patients , use of steroids during CRR is of uncertain benefit .
Respiratory or • In the United States in 2013 , 16 235 people13died of prescripton opioid toxicity, and
an additional 8257 died of heroin overdose,
,14
In the United States in 2012 opioid
,
Cardiac Arrest overdose became the leading cause of unintentional injurious death in people aged
Associated With 25 to 60 years , accounting for more deaths than motor vehicle collisions. A majority
''
Opioid Overdose of these deaths are associated with prescription opiods. Statistics are similar
in Canada 111 .
(CNS) and respirato -
* Isolated opioid toxicity is associated wsth central nervous system
ry depression that can progress to respiratory and cardiac arrest . Most opioid deaths
involve the co ingestion of multiple drugs or medical and mental health comorbidi-
ties.17 -20 In addition, methadone and propoxyphene can cause torsades de pointes,
and cardie toxicity has been reported with other opioids, Except in specific clinical
settings (eg, unintended opioid overdose during a medical procedure ) , rescuers can -
not be certain that the patient ' s clinical condition is due to opioid - inducod CNS and
respiratory depression toxicity alone .
107
* Naloxone is a potent ooiotd receptor antagonist in the brain, spinal cord, and Gl
system. Naloxone has an excellent safety profile and can rapidly reverse CNS and
respiratory depressaon in a patient with an opioid - associated resuscitatsve emergency,
Based or the rescuer 's training and clinical circumstance, naloxone can be adminis -
tered intravenously, .
intramuscularly,211,29,32 intranasally 30,32- 36 or subcutaneously - 7;
nebulized for inhalation ^ - ; or instilled into the bronchial tree via ET tube. 41
3 '
1
* For patients with Known or suspected opiosd overdose who are in respiratory* arrest ,
healthcare providers should give naloxone as soon as it is available. It may be given
at a dose of 2 mg IN or 0.4 mg IM/IV, which may be repeated every 4 minutes if
necessary. Figure 38 shows the algorithm for opioid overdose. While this algorithm
was designed for lay rescuers, ACLS providers will follow the ACLS systematic
approach, which includes a pulse check .
i
Begin CPR.
If victim is unresponsive with no breathing
or only gasping, begin CPR / It alone,
perform CPR for about; 2 minutes before
leavrng to phone your local emergency
number and get naloxone and AED
Administer naloxone.
Give naloxone as soon as ' t is available.
2 mg intranasal or 0.4 mg intramuscular.
May repeat after 4 minutes.
' 1
-
201s Ai’- ;ncan Heart Association
108
The ACLS Cases: Cardiac Arrest: VFiPulseless VT
In settings where ECPR can be rapidly implemented, providers may consider its use
among select cardiac arrest patients with potentially reversible causes of cardiac
arrest who have not responded to initial conventional CPR .
Ultrasound Use in Ultrasound may be applied to patients receiving CPR to help assess myocardial contractil-
Cardiac Arrest ity and to help identify potentially treatable causes of cardiac arrest, such as hypovolemia,
pneumothorax , pulmonary thromboembolism, or pericardial tamponade. However, it is
unclear whether important clinical outcomes are affected by the routine use of ultrasound
among patients experiencing cardiac arrest. If a qualified sonographer rs present and use
]
of ultrasound does not interfere with the standard cardiac arrest treatment protocol, then
ultrasound may be considered as an adjunct to standard patient evaluation.
109
Cardiac Arrest: Pulseless Electrical Activity Case
Introduction This case focuses on assessment and management of a cardiac arrest patient with PEA.
During the BLS Assessment , high performance team members will demonstrate high-
quality GPR with effective chest compressions and ventilation with a bag - mask device. In
the Primary Assessment , the team leader will recognize PEA and implement the appropn-
ate interventions outlined in the Cardiac Arrest Algorithm, Because correction of an under -
lying cause of PEA , it present and identified, as critical to patient outcome, the team leader
will verbalize the differential diagnosis while leading the high-performance team in the
search tor and treatment of reversible causes.
Rhythms for PEA You will need to recognize the following rhythms:
* Epinephrine
* Other medications, denending on the cause of the PEA arrest
Description of PEA
Introduction PFA encompasses a heterogeneous group of rhythms that are organized or semiorganized
but lack a palpable pulse. PEA includes
* Idioventricular rhythms
* Ventricular escape rhythms
* FostdefibriNation idioventricular rhythms
Sinus rhythm
* Other
-
Any organized rhythm without a pulse is defined as PEA, Even sinus rhythm without a
detectable pulse is called PEA . Pulseless rhythms that are excluded by definition include
VF, pVT. and asystole..
' An crc; ani7ftri rhythm consists of ORS complexes that an
>
? similar n appearance from beat to best i e , each has
a un form OHS oont nnmtinnh Organized rhythms may have narrow or wide ORS they may occur at
rape or slow rales Ihey may be regular or irregular, and they may or may not produce a pulse.
Historical Previously, high-performance teams used the term electromechanical dissociation (EMD)
Perspective to describe patients who displayed electrical activity on the cardiac monitor but lacked
apparent contractile function because of an undetectable pulse. That is . weak contractile
function is present - detectable by invasive moortoring or echocardiography — but the car-
diac function is too weak to produce a pulse or effective cardiac output. This ie the most
common initial condition present after successful defibriNation. PEA also includes other
conditions where the heart s empty because of inadequate ore oad. In this case , the con -
tractile function of the heart is adequate but there is inadequate volume for the ventricle
,
110
The ACLS Cases: Cardiac Arrest: Pulseless Electrical Activity
Overview As described earlier the Cardiac Arrest Algorithm consists of 2 caroiac arrest pathways
,
(Figure 39) . The left side of the algorithm outlines treatment for a shockable rhythm (VF/
pVT) . The right side of the algorithm ( Steps 9 through 11) outlines treatment for a non -
shockable rhythm (asystole/PEA ). Because of the similarity in causes and management ,
the Cardiac Arrest Algorithm combines the asystole and PEA pathways, although we will
review these rhythms in separate cases. In both pathways, therapies are organized around
periods (2 minutes) of uninterrupted, high-quality CPR .
The ability to achieve a good resuscitation outcome with return of a perfusing rhythm and
spontaneous respirations depends on the ability of the high - performance team to provide
effective CPR and to identify and correct a cause o* PEA if present .
Everyone or the high- performance team must carry out the steps outlined in the algorithm
and a’ the same time focus on the identification and Treatment of reversible causes of
the arrest .
The PEA Pathway of In this case, the patient is in cardiac arrest . High -performance team members initiate
the Cardiac Arrest and perform nigh - qualit / CPF throughout the BLS Assessment and the Primary and
1
Algorithm Secondary Assessments. The team interrupts CPR for 10 seconds or less for rhythm
and pulse checks. This patient has an organized rhythm on the monitor hut no pulse. The
.
condition is PEA ( Step 9) Chest compressions resume immediately. The team eader now
directs the team in the steps outlined in the PEA pathway of the Cardiac Arrest Algorithm
( Figure 39) . beginning with Step 10 .
IV /IO access is a prior ty over advanced airway management unless bag - mask ventila -
tion is ineffective or the arrest is caused by hypoxia . All high - performance team members
must simultaneously conduct a search for an underlying and treatable cause of the PEA in
addition to performing their assigned roles .
Decision Point: Conduct a rhythm check and give 2 minutes of CPR after administration ot the drugs .
Rhythm Check Be careful to minimize interruptions in chest compressions.
m
Adult Cardiac Arrest Algorithm — 2015 Update -
CPR Quality
i * InKvarterial pressure
- f rela.xation phaie ( n- ia-
atoJic) pressure mm Hg
Shook attempt to improve f. PF
quarty.
4
Shock Energy for DefibritlartkHi
CPR 2 min
IV40 access * Blphask: MorsJtact net
reoommandat on (eg, inrtiel.
dose ’ 12D - 2CO J ; if unknown >
.
use r'- a.M mum available.
t No
Second and subsequent doses
tfwuid bo oquIvatenL, and lugho
Rhythm *
i l *- shock able ?
doses may he nomirtefed
* M anophasicL 3fi0 .I
| Yes Drug Therapy
No Reversible Causes
Rhythm Yes
-
112
The ACLS Cases: Cardiac Arrest: Pulseless Electrical Activity
Decision Point: * If the rhythm check reveals a shockable rhythm, resume CPR with chest compres-
sions while the defibrillator is charging if possible.
Shock able Rhythm
* Switch to the left side of the algorithm and perform steps according to the VF /pVT
sequence starting with Step 5 or 7.
Asystole and .
Figure 39 summarizes the recommended sequence of CPR rhythm checks , and
PEA Ti*eatment delivery of drugs for PEA and asystole based on expert consensus.
Sequences
Identification Treatment of PEA is not limited to the interventions outlined in the algorithm Healthcare
and Correction of providers should attempt to identify and correct an underlying cause if present. Healthcare
Underlying Cause providers must stop , think, and ask ,. “ Why did this person have this cardiac arrest at this
: :
-
time? " It is essential to search for and treat reversible causes of asystole for resuscita
tive efforts to be potentially successful. Use the H s and T s to recall conditions that could
have contributed to PEA.
113