ECG ECG in Clinical Practice

Question 1

How does an ECG differ in pediatric patients compared to adults?

Accepted Answer

Children normally have faster heart rates, right axis deviation in infancy, and different normal values for intervals

Answer

Pediatric ECGs are identical to adult ECGs

Answer

Children always have abnormal ECGs

Answer

ECG is not used for pediatric patients

Question 2

What is Holter monitoring?

Accepted Answer

Continuous ambulatory ECG recording over 24-48 hours to detect intermittent arrhythmias

Answer

A one-time resting ECG

Answer

An exercise stress test

Answer

An echocardiogram procedure

Question 3

What ECG changes are expected during an exercise stress test?

Accepted Answer

Increasing heart rate, ST segment changes indicating ischemia, and arrhythmia detection under exertion

Answer

No ECG changes should occur during exercise

Answer

The ECG should show decreasing heart rate

Answer

Only blood pressure changes are monitored

Question 4

What is the significance of pathological Q waves on an ECG?

Accepted Answer

They indicate previous myocardial infarction with irreversible tissue death in the affected area

Answer

They are always a normal finding

Answer

They indicate electrolyte imbalance

Answer

They only appear during exercise

Question 5

How does right bundle branch block (RBBB) appear on an ECG?

Accepted Answer

Wide QRS (>120ms) with rsR' pattern in V1 (rabbit ears) and wide S wave in V6

Answer

Narrow QRS with tall R waves

Answer

Absent P waves

Answer

ST elevation in all leads

Question 6

What does an ECG technologist do when encountering a life-threatening rhythm?

Accepted Answer

Immediately alert the supervising physician or activate the emergency response system per facility protocol

Answer

Continue recording without interruption

Answer

Wait until the recording is complete before acting

Answer

Attempt to treat the patient independently