Cardiac Dysrhythmia and Electrocardiogram Interpretation Examination
Covering PR Interval QRS Complex and QT Interval Analysis, Electrolyte Induced
ECG Changes in Hypokalemia Hyperkalemia Hypomagnesemia and Calcium
Imbalance, Sinus Atrial Junctional and Ventricular Dysrhythmia Recognition,
Atrial Fibrillation and Atrial Flutter Pathophysiology, Supraventricular
Tachycardia Mechanisms and Vagal Maneuvers, Premature Atrial Complexes and
Premature Ventricular Contractions Identification, Ventricular Tachycardia and
Ventricular Fibrillation Emergency Management, Asystole Resuscitation
Protocols, First Second and Third Degree Atrioventricular Block Interpretation,
Mobitz Type I Wenckebach and Mobitz Type II Conduction Disorders, Bundle
Branch Block Intraventricular Conduction Delay, Antiarrhythmic Pharmacology
Including Adenosine Amiodarone Lidocaine and Beta Blockers Exam Questions
Verified and Provided with Complete A+ Graded Rationales Latest Updated 2026
PR interval
0.12-.0.2 sec
> 0.2 represents conduction delay
QRS Complex
< 0.12 sec
> 0.12 suggests bundle branch or conduction delay
QT interval
Should be less than half of the R-R interval
> 0.50 sec is considered dangerously prolonged
,Low potassium EKG
Prolonged PR and QT intervals
ST segment depression
T wave flattening or inversion
PVCs
AV blocks
High potassium EKG
Tall peaked T waves
QRS complex widens
Cardiac arrest
Asystole
Low magnesium EKG
Prominent U waves
Flattening of T waves
Prolonged QT intervals
Widening of QRS complex
Torsade de pointes
High magnesium EKG
, Bradycardia
Prolonged PR, QRS, and QT intervals
Widened QRS complex
Complete heart blocks
Cardiac arrest
Low calcium EKG
Prolonged ST segment
PVCs
High calcium EKG
Shortened ventricular repolarization and QT interval
First degree AV block
Risk factors for development of dysrhythmias
Hypoxemia
Fluid abnormalities
Altered body temperature
Fluid volume excess
Ventricular enlargement, decreased contractility, premature beats; AV blocks
Covering PR Interval QRS Complex and QT Interval Analysis, Electrolyte Induced
ECG Changes in Hypokalemia Hyperkalemia Hypomagnesemia and Calcium
Imbalance, Sinus Atrial Junctional and Ventricular Dysrhythmia Recognition,
Atrial Fibrillation and Atrial Flutter Pathophysiology, Supraventricular
Tachycardia Mechanisms and Vagal Maneuvers, Premature Atrial Complexes and
Premature Ventricular Contractions Identification, Ventricular Tachycardia and
Ventricular Fibrillation Emergency Management, Asystole Resuscitation
Protocols, First Second and Third Degree Atrioventricular Block Interpretation,
Mobitz Type I Wenckebach and Mobitz Type II Conduction Disorders, Bundle
Branch Block Intraventricular Conduction Delay, Antiarrhythmic Pharmacology
Including Adenosine Amiodarone Lidocaine and Beta Blockers Exam Questions
Verified and Provided with Complete A+ Graded Rationales Latest Updated 2026
PR interval
0.12-.0.2 sec
> 0.2 represents conduction delay
QRS Complex
< 0.12 sec
> 0.12 suggests bundle branch or conduction delay
QT interval
Should be less than half of the R-R interval
> 0.50 sec is considered dangerously prolonged
,Low potassium EKG
Prolonged PR and QT intervals
ST segment depression
T wave flattening or inversion
PVCs
AV blocks
High potassium EKG
Tall peaked T waves
QRS complex widens
Cardiac arrest
Asystole
Low magnesium EKG
Prominent U waves
Flattening of T waves
Prolonged QT intervals
Widening of QRS complex
Torsade de pointes
High magnesium EKG
, Bradycardia
Prolonged PR, QRS, and QT intervals
Widened QRS complex
Complete heart blocks
Cardiac arrest
Low calcium EKG
Prolonged ST segment
PVCs
High calcium EKG
Shortened ventricular repolarization and QT interval
First degree AV block
Risk factors for development of dysrhythmias
Hypoxemia
Fluid abnormalities
Altered body temperature
Fluid volume excess
Ventricular enlargement, decreased contractility, premature beats; AV blocks
