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Cardiac Arrest Arrhythmias
Terry White, RN
Cardiac Arrest
Mechanisms
Ventricular
Fibrillation
Pulseless Ventricular Tachycardia
Asystole
Pulseless Electrical Activity (PEA)
A condition; Not an ECG rhythm
Cardiac Arrest
Most
common rhythms
Adults:
ventricular fibrillation
Children: Asystole, Bradycardic PEA
Pediatric V-fib suggests:
Drug toxicity
Electrolyte imbalance
Congenital heart disease
Cardiac Arrest
ABCs
come first!
- unobstructed? manually open
Breathing - no or inadequate ventilate
Circulation - no pulse in 5 sec chest
compressions
Airway
Do
NOT wait on equipment
Assure effective BLS before going to ALS
Rise
and fall of chest
Air movement in lung fields
Pulse with compressions
Cardiac Arrest
First ALS
Only
priority is defibrillation
cure for v-fib is defib
The quicker the better
Probability of resuscitation decreases
7-10% with each passing minute
Cardiac Arrest
Vascular access
Antecubital
space
Arm, EJ, Foot (last resort)
IO in peds < 6 y/o
14 or 16 gauge
LR or NS
30 sec - 60 sec of CPR to circulate drug
Cardiac Arrest
Intubation
Less
as time allows
emphasis today as compared to
past
Epi, atropine, lidocaine may be
administered down tube
2x IV dose
IV is preferred
Analyze the Rhythm
Ventricular Fibrillation (VF)
Characteristics
Chaotic,
irregular, ventricular rhythm
Wide, variable, bizarre complexes
Fast rate of activity
Multiple ventricular foci
No cardiac output
Terminal rhythm if not corrected quickly
Most common rhythm causing sudden
cardiac death in adults
Ventricular Fibrillation (VF)
Treatment
ABC’s
Witnessed
arrest: Precordial thump
Little demonstrated value but worth a try
CPR
until defibrillator available
Quick Look for VF or pulseless VT
Treat pulseless VT as if it were VF
Defibrillate
200 J, 300 J, 360 J
Quickly and in rapid succession
Identify
cause if possible
Ventricular Fibrillation
Treatment
If
still in VF/VT arrest, continue CPR for 1
minute
Establish IV access and Intubate
If sufficient personnel, attempt both simultaneously
If not, quick attempt at IV access then attempt ETT
Vasopressor
Medication
Epinephrine
1 mg 1:10,000 IVP
Repeat every 3-5 mins as long as arrest persists
Vasopressin (alternative to Epinephrine)
40 units IVP one time only
Ventricular Fibrillation
Treatment
Shock @ 360 J after each medication given as
long as VF/VT arrest persists
Alternate epi-shock & antidysrhythmic-shock sequence
Antidysrhythmic Medication
amiodarone 300 mg IVP single dose
lidocaine 1-1.5 mg/kg IVP, q 5 min, max 3mg/kg total
procainamide 100 mg IV, q 5 min, max 17 mg/kg total
magnesium 10% 1-2 g IV
if hypomagnesemic or prolonged QT
Ventricular Fibrillation
Treatment
Consider NaHCO3 if prolonged
Only after effective ventilations
In many EMS systems, consider terminating
resuscitation efforts in consult with med control
Ventricular Fibrillation
The
ultimate unstable tachycardia
Shock early-Shock often
Sequence is drug-shock-drug-shock
Sequence
of drugs is epiantiarrhythmic-epi-antiarrhythmic
Analyze the Rhythm
Asystole
Characteristics
The
ultimate unstable bradycardia
A terminal rhythm
poor prognosis for resuscitation
best hope if ID & treat cause
No significant positive or negative
deflections
Asystole
Possible
Causes
Hypoxia:
ventilate
Preexisting metabolic acidosis:
Bicarbonate 1 mEq/kg
Hyperkalemia: Bicarbonate 1 mEq/kg,
Calcium 1 g IV
Hypokalemia: 10mEq KCl over 30
minutes
Hypothermia: rewarm body core
Asystole
Possible
Drug
Causes
overdose
Tricyclics: Bicarbonate
Digitalis: Digibind (Digitalis
antibodies)
Beta-blockers: Glucagon
Ca-channel blockers: Calcium
Asystole & PEA Differentials
(The 5Hs & 5Ts)
Hypovolemia
Hypoxia
Hydrogen
ions
(Acidosis)
Hyper/hypokalemia
Hypothermia
Tablets
(Drug OD)
Tamponade
Tension
Pneumothorax
Thrombosis,
Coronary
Thrombosis,
Pulmonary
Asystole Treatment
Primary ABCD
Confirm Asystole
in two leads
Reasons to NOT continue?
Secondary ABCD
ECG
monitor/ET/IV
Differential Diagnosis (5Hs & 5Ts)
TCP (if early)
Epinephrine 1:10,000 1 mg IV q 3-5 min.
Atropine 1 mg IV q 3-5 min, max 0.04 mg/kg
Consider Termination
Analyze the Rhythm
What are you going to do for this patient?
Case Presentation
The patient is a 16-year-old male who was stabbed in
the left lateral chest with a butcher knife. He responds
only to pain. His respirations are rapid, shallow, and
labored. Central cyanosis is present. Breath sounds
are absent on the left side. The neck veins are
distended. The trachea deviates to the right. Radial
pulses are absent. Carotids are rapid and weak.
Now, what are you going to do
for this patient?
PEA
Possibilities
Massive
pulmonary embolus
Massive myocardial infarction
Overdose:
Tricyclics - Bicarbonate
Digitalis - Digibind
Beta-blockers - Glucagon
Ca-channel blockers - Calcium
PEA
Identify,
correct underlying cause if possible
Possibilities:
Hypovolemia: volume
Hypoxia: ventilate
Tension pneumo: decompress
Tamponade: pericardiocentesis
Acute MI: vasopressor
Hyperkalemia: Bicarbonate 1mEq/kg
Preexisting metabolic acidosis: Bicarbonate
1mEq/kg
Hypothermia: rewarm core
PEA Treatment
ABCDs
ETT/IV/ECG
monitor
Differential Diagnosis
Find the cause and treat if possible
Epinephrine
1:10,000 1 mg q 3-5 min.
If bradycardic,
Atropine 1 mg IV q 3-5 min, Max 0.04 mg/kg
TCP
In
many systems, consider termination of
efforts
Hypothermia-Initial Therapy
Remove
wet garments
Protect against heat loss & wind chill
Maintain horizontal position
Avoid rough movement and excess
activity
Hypothermia – No Pulse
CPR
Defibrillate
X 3 if VF/VT
ETT with warm, humidified O2
IV access with warm fluids
Temp >30C/86F:
Continue as usual with longer intervals
Repeat defibrillation as temp rises
Temp
<30C/86F
Continue CPR
Withhold medications and further defibrillation
Transport for core warming
Hypothermia – No Pulse
Remember: A hypothermic patient is
not dead until he is WARM & DEAD!!!
Managing Cardiac Arrest
Check pulse after any treatment or
rhythm change
Post-resuscitation Care
If
pulse present:
Assess breathing
Present?
Air moving adequately?
Equal breath sounds?
Possible flail chest?
Post-resuscitation Care
If
pulse present:
Protect
airway
Position to prevent aspiration
Consider intubation
100% Oxygen via BVM or NRB
Vascular access
Post-resuscitation Care
Assess
perfusion
Evaluate
Pulses
Skin
color
Skin temperature
Capillary refill
BP
Key is perfusion, not pressure
Post-resuscitation Care
Management
Fluid
of Decreased Perfusion
challenge
Catecholamine infusion
Dopamine, or
Norepinephrine
Titrate to BP ~ 90 to 100 systolic
Post-resuscitation Care
Suppression
of ventricular
irritability
If
VT or VF converted before lidocaine
given, lidocaine bolus and drip
If lidocaine or bretylium worked, begin
infusion
Suppress irritability before giving
vasopressors