What are the three main components of an ECG waveform?
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Understand ECG principles, waveforms, intervals, and their significance in diagnosing arrhythmias, ischemia, and other cardiac conditions.
Mastering this deck enables healthcare professionals to interpret ECGs accurately, facilitating early diagnosis of cardiac abnormalities such as arrhythmias and ischemia, ultimately improving patient management and outcomes.
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| # | Front | Back | Hint |
|---|---|---|---|
| 1 | What are the three main components of an ECG waveform? | The P wave, QRS complex, and T wave are the three main components, representing atrial depolarization, ventricular depolarization, and ventricular repolarization, respectively. | Think of the P as 'Atrial', QRS as 'Ventricular', T as 'Recovery'. |
| 2 | What does the PR interval represent, and what is its normal duration? | The PR interval represents the time from atrial depolarization to ventricular depolarization, including conduction through the AV node. Normal duration is 120-200 milliseconds (0.12-0.20 seconds). | Think of PR as the 'pause' between atrial and ventricular activity. |
| 3 | How is the QT interval measured, and why is it clinically important? | The QT interval is measured from the start of the QRS complex to the end of the T wave. It reflects ventricular depolarization and repolarization. Prolonged QT can predispose to arrhythmias like Torsades de Pointes. | Remember QT as 'Q-T to T wave, the ventricular recovery time.' |
| 4 | What is the significance of ST segment elevation on an ECG? | ST segment elevation indicates acute myocardial injury or infarction, typically seen in ST-elevation myocardial infarction (STEMI). | Think 'ST-elevation' as 'injury' or 'acute ischemia'. |
| 5 | What ECG change is characteristic of hyperkalemia? | Tall, peaked T waves are characteristic of hyperkalemia, often accompanied by widened QRS complexes as severity increases. | Remember 'T' for 'Tall T waves' in hyperkalemia. |
| 6 | How does atrial fibrillation typically appear on an ECG? | Atrial fibrillation shows an irregularly irregular rhythm with absent discernible P waves and irregular R-R intervals. | Think 'Irregular P's' and 'No P waves' for AF. |
| 7 | What is the significance of a prolonged QRS complex (>120 ms)? | A prolonged QRS indicates delayed ventricular conduction, often due to bundle branch blocks or ventricular rhythms. | QRS prolongation suggests 'conduction delay'. |
| 8 | Which ECG pattern is indicative of ischemia or injury in the anterior wall of the heart? | ST segment elevation in the precordial leads (V1-V4) suggests anterior wall myocardial infarction. | Think 'V1-V4' as 'anterior' leads. |
| 9 | What is the typical ECG finding in a patient with a pericarditis? | Diffuse widespread ST segment elevation and PR segment depression are characteristic of pericarditis. | Look for 'widespread ST elevation' across multiple leads. |
| 10 | Define sinus rhythm and its typical rate range. | Sinus rhythm originates from the sinoatrial node with a regular rate between 60-100 beats per minute. | Think 'sinus' as the natural pacemaker of the heart. |
| 11 | What does a 'delta wave' on an ECG indicate? | A delta wave signifies pre-excitation of the ventricles via an accessory pathway, seen in Wolff-Parkinson-White syndrome. | Remember 'delta' as 'early activation'. |
| 12 | How can you differentiate between atrial flutter and atrial fibrillation on an ECG? | Atrial flutter shows sawtooth flutter waves, usually at a rate of 250-350 bpm, with regular atrial activity; AF shows irregularly irregular rhythm with absent P waves. | Flutter = 'sawtooth'; fibrillation = 'irregular irregular'. |
| 13 | What is the clinical significance of a short PR interval (<120 ms)? | A short PR interval suggests pre-excitation syndromes like Wolff-Parkinson-White, due to early ventricualr activation via an accessory pathway. | Think 'short' as 'early' conduction. |
| 14 | What characteristic ECG feature defines a first-degree AV block? | Prolongation of the PR interval beyond 200 ms with a regular rhythm and all P waves followed by QRS complexes. | First-degree = 'lengthened PR'. |
| 15 | What arrhythmia is characterized by a regular, narrow QRS complex tachycardia at 150-250 bpm with retrograde P waves often hidden? | Supraventricular tachycardia (SVT), often reentrant in origin. | Think 'rapid, narrow, regular'—common in young adults. |
| 16 | What is the typical ECG finding in ventricular tachycardia? | Wide QRS complexes (>120 ms) at a rate of 100-250 bpm, usually with a regular rhythm and no preceding P waves. | Ventricular tachycardia = 'wide QRS'. |
| 17 | How does the ECG change in digitalis toxicity? | Down-sloping ST depression with scooped appearance (sometimes called 'Salvador Dali's mustache') and arrhythmias. | Think 'digitalis' causes 'scooped' ST segments. |
| 18 | What does a peaked T wave indicate in terms of serum potassium levels? | Peaked T waves are an early sign of hyperkalemia, indicating elevated serum potassium. | T wave peaks = 'hyperkalemia'. |
| 19 | What ECG findings suggest a right bundle branch block (RBBB)? | Wide QRS (>120 ms) with an rsR' pattern in V1 and a wide S wave in V6. | RBBB creates 'M-shaped' R' in V1. |
| 20 | What is the typical ECG pattern in left bundle branch block (LBBB)? | Wide QRS (>120 ms) with broad, notched, or slurred R waves in leads V5 and V6, and absent Q waves in lateral leads. | LBBB causes 'widened, slurred' QRS complexes. |
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