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EKG INTERPRETATION EXAM REVISION STUDY GUIDE
Mastering Cardiac Rhythms, Arrhythmias & ECG Recognition
1. Electrocardiography (EKG) Interpretation
Correct Answer:
Electrocardiography (EKG) is one of the most useful and commonly used diagnostic tools that
measures the heart’s electrical activity as waveforms.
An EKG uses electrodes attached to the skin to detect electrical currents moving through the
heart. These signals are transmitted to create a record of cardiac activity.
Arrhythmia/Dysrhythmia refers to disturbances in the normal cardiac rhythm caused by
alterations in the conduction of electrical impulses.
These electrical impulses:
• Stimulate atrial and ventricular myocardial contractions.
• Coordinate cardiac activity.
• Maintain adequate cardiac output.
,2. Sinus Tachycardia
Correct Answer:
Sinus tachycardia is a heart rate greater than 100 beats/minute that originates from the
sinoatrial (SA) node.
EKG Characteristics:
• Rate: 100–180 beats/min
• P waves: Present before every QRS complex
• PR interval: Normal
• QRS complex: Normal
• Conduction: Normal
• Rhythm: Regular
Causes:
• Exercise
• Anxiety
• Fever
• Drugs
• Anemia
• Heart failure
• Hypovolemia
• Shock
Management:
• Treat the underlying cause.
• Carotid sinus massage may reduce heart rate.
• Beta-blockers may be prescribed.
3. Sinus Bradycardia
, Correct Answer:
Sinus bradycardia is a heart rate less than 60 beats/minute originating from the SA node.
EKG Characteristics:
• Rate: <60 beats/min
• P waves: Before every QRS
• PR interval: Normal
• QRS complex: Normal
• Conduction: Normal
• Rhythm: Regular
Causes:
• Drugs
• Increased vagal stimulation
• Hypothyroidism
• Hypothermia
• Sinus node damage during MI
Clinical Manifestations:
• Syncope
• Fatigue
• Dizziness
Management:
• Treat underlying cause.
• Administer atropine sulfate as prescribed.
4. Premature Atrial Contraction (PAC)
Correct Answer:
material dysrhythmias relias test
sample questions500+ practice
questions correct answers detailed
rationales mock exams universal
certification prep
EKG INTERPRETATION EXAM REVISION STUDY GUIDE
Mastering Cardiac Rhythms, Arrhythmias & ECG Recognition
1. Electrocardiography (EKG) Interpretation
Correct Answer:
Electrocardiography (EKG) is one of the most useful and commonly used diagnostic tools that
measures the heart’s electrical activity as waveforms.
An EKG uses electrodes attached to the skin to detect electrical currents moving through the
heart. These signals are transmitted to create a record of cardiac activity.
Arrhythmia/Dysrhythmia refers to disturbances in the normal cardiac rhythm caused by
alterations in the conduction of electrical impulses.
These electrical impulses:
• Stimulate atrial and ventricular myocardial contractions.
• Coordinate cardiac activity.
• Maintain adequate cardiac output.
,2. Sinus Tachycardia
Correct Answer:
Sinus tachycardia is a heart rate greater than 100 beats/minute that originates from the
sinoatrial (SA) node.
EKG Characteristics:
• Rate: 100–180 beats/min
• P waves: Present before every QRS complex
• PR interval: Normal
• QRS complex: Normal
• Conduction: Normal
• Rhythm: Regular
Causes:
• Exercise
• Anxiety
• Fever
• Drugs
• Anemia
• Heart failure
• Hypovolemia
• Shock
Management:
• Treat the underlying cause.
• Carotid sinus massage may reduce heart rate.
• Beta-blockers may be prescribed.
3. Sinus Bradycardia
, Correct Answer:
Sinus bradycardia is a heart rate less than 60 beats/minute originating from the SA node.
EKG Characteristics:
• Rate: <60 beats/min
• P waves: Before every QRS
• PR interval: Normal
• QRS complex: Normal
• Conduction: Normal
• Rhythm: Regular
Causes:
• Drugs
• Increased vagal stimulation
• Hypothyroidism
• Hypothermia
• Sinus node damage during MI
Clinical Manifestations:
• Syncope
• Fatigue
• Dizziness
Management:
• Treat underlying cause.
• Administer atropine sulfate as prescribed.
4. Premature Atrial Contraction (PAC)
Correct Answer:
