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EKG Changes & Lethal Dysrhythmias 2026/2027 | ECG Interpretation & Cardiac Rhythm Exam Review

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EKG Changes & Lethal Dysrhythmias 2026/2027 | ECG Interpretation & Cardiac Rhythm Exam Review

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Ghythmias
ChangesPage
.pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))________________________________$U&*($710/14/2026,
& Lethal
12026-10-14EKG
DysrhythmiasChanges
.pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))________________________________$U&*($710/14/20
& Lethal Dysrhythmias .pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))_____________________
2:15:04 AM




EKG Changes & Lethal Dysrhythmias


The two treatments that depolarize a critical mass of myocardial cells all at once are -
ANSWER-Defibrillation and Cardioversion

Cardioversion is indicated for patient with persistent tachyarrhythmia (with a pulse)
causing - ANSWER-Hypotension
Altered mental status
Signs of shock
Ischemic chest pain
Acute heart failure
Atrial Fibrillation
Supraventricular Tachycardia (SVT)

★ Ventricular Tachycardia ★

What are the characteristics of a Cardioversion? - ANSWER-Patient MUST have a
pulse
Synchronized with the heart's electrical activity or electrocardiogram

Cardioversion involves the delivery of a timed electrical current, therefore, the patient
must be connected to a - ANSWER-Cardiac Monitor

During Cardioversion, which waves are marked? - ANSWER-★ R waves ★

Cardioversion discharges energy on - ANSWER-★ Ventricular depolarization ★

- Occurs during the QRS complex

Cardioversion prevents discharge during - ANSWER-Ventricular repolarization
- Occurs during the T Wave

Cardioversion allows for a delay in discharge. If an electrical shock is delivered during
ventricular repolarization, it could possibly induce - ANSWER-★ R-on-T Phenomenon
★




Ghythmias
Changes2026-10-14EKG
.pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))________________________________$U&*($710/14/2026,
& Lethal Dysrhythmias
Changes.pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))________________________________$U&*($710/14/20
& Lethal Dysrhythmias .pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))__________________________
2:15:04 AM

,Ghythmias
ChangesPage
.pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))________________________________$U&*($710/14/2026,
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.pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))________________________________$U&*($710/14/20
& Lethal Dysrhythmias .pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))_____________________
2:15:04 AM




During Cardioversion, the discharge buttons must be held down until shock is -
ANSWER-Delivered

If a patient presents with a dysrhythmia that has last longer than 48 hours, the provider
may opt for an - ANSWER-Elective cardioversion

Anticoagulation therapy is recommended before cardioversion of a dysrhythmia lasting
more than 2 days to avoid - ANSWER-Thromboembolic complications

Prior to an elective cardioversion, what are important measures? - ANSWER-★ Digoxin
is held ★

★ NPO status ★

Pads are place anteroposteriorly
Sedation, Analgesics, and Anesthesia

What is the voltage delivered during a cardioversion? - ANSWER-50-360 joules

★ Less damage compared to Defibrillation ★

What actions should the nurse take if rhythm conversion happens after cardioversion? -
ANSWER-Monitor peripheral pulses
Assess airway patency and level of consciousness

★ Closely monitor blood pressure, vital signs, oxygen saturation, and EKG ★

What are the characteristics of a Defibrillation? - ANSWER-Immediate
★ Unsynchronized ★

★ Patient has no pulse or blood pressure ★

Defibrillation is used in the emergency treatment for - ANSWER-★ Ventricular
Fibrillation ★

Pulseless Ventricular Tachycardia

Early defibrillation is the key to - ANSWER-★ Better survival rate ★




Ghythmias
Changes2026-10-14EKG
.pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))________________________________$U&*($710/14/2026,
& Lethal Dysrhythmias
Changes.pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))________________________________$U&*($710/14/20
& Lethal Dysrhythmias .pdf10/14/2026*&#(*^$&@^*$*U(H$*H*H&$)*&$(&^$&*^^$(&))))))))))))))))))))))))))))__________________________
2:15:04 AM

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