1) . What does the P wave represent in an ECG? a) Ventricular repolarization b) Atrial depolarization c) QRS complex 2) What is the normal duration of the PR interval? a) 0.02-0.10 seconds b) 0.12-0.20 seconds c) 0.30-0.40 seconds 3) What does an elevated ST segment indicate? a) Sinus arrhythmia b) Cardiac ischemia c) Right bundle branch block 4) What is the standard lead for monitoring cardiac activity in an ECG? a) Lead I b) Lead II c) Lead III 5) What does the T wave represent in an ECG? a) Atrial depolarization b) Ventricular repolarization c) QRS complex 6) What is the normal heart rate in an ECG? a) 40-60 beats per minute b) 60-100 beats per minute c) 100-140 beats per minute 7) What does right bundle branch block indicate in an ECG? a) Delay in atrioventricular conduction b) Issues with ventricular repolarization c) Delay in conduction in the right bundle branch of the His bundle 8) What is the name of the first complex in a normal ECG? a) P wave b) QRS complex c) T wave 9) What is the function of ambulatory ECG monitoring? a) Monitoring cardiac activity during sleep b) Recording heart electrical activity during daily activities c) Evaluating lung function 10) What does a pathological Q wave indicate in an ECG? a) Normal electrical activity b) Possible previous infarction c) Atrial depolarization 11) In what cases is an exercise ECG used? a) Assessing cardiac activity at rest b) Detecting nighttime arrhythmias c) Evaluating the heart's response to exercise 12) What is the correct calculation for heart rate in an ECG? a) Divide the RR interval by 60 b) Subtract the T wave from the QRS complex c) Add the P wave to the PR interval 13) What does a prolonged QT interval indicate in an ECG? a) Risk of arrhythmias b) Normal heart rhythm c) Rapid ventricular depolarization 14) What is the normal variation of heart rate? a) Constant throughout the day b) Without variation c) With variation, indicating autonomic adaptability 15) What does the amplitude of waves represent in an ECG? a) Duration of the T wave b) Strength of electrical activity c) Height of the P wave 16) What is the primary purpose of the U wave in an ECG? a) Atrial depolarization b) Ventricular repolarization c) Evaluation of valve function 17) What is assessed with the slope of the ST segment in an ECG? a) Sinus node conduction b) Cardiac ischemia c) Atrial fibrillation 18) What does a Holter monitor ECG primarily do? a) Monitor cardiac activity during invasive procedures b) Record heart electrical activity over an extended period c) Evaluate lung function 19) What does an inverted T wave in multiple leads in an ECG indicate? a) Normal electrical activity b) Possible cardiac ischemia c) Ventricular arrhythmia 20) When might an emergency ECG be necessary? a) Evaluating lung function b) Suspected acute myocardial infarction c) Routine monitoring during exercise

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