In modern NORCET exams, especially the Mains stage, image-based ECG questions are extremely common. You might be shown a lead II rhythm strip and asked to identify the condition or state the immediate nursing action.
Understanding the Normal ECG Wave
Before identifying pathology, you must know what normal looks like:
- P Wave: Represents Atrial Depolarization (Atrial contraction).
- PR Interval: Time taken for impulse to travel from SA Node to AV Node (Normal: 0.12 - 0.20 seconds).
- QRS Complex: Represents Ventricular Depolarization (Ventricular contraction, Normal: 0.06 - 0.12 seconds).
- T Wave: Represents Ventricular Repolarization (Ventricular relaxation).
Life-Threatening Arrhythmias & Nursing Interventions
Be prepared to recognize and manage these emergency patterns:
- Ventricular Fibrillation (V-Fib): Chaotic, wavy line without identifiable complexes. Action: Check pulse, start CPR immediately, and prepare for Defibrillation.
- Ventricular Tachycardia (V-Tach): Rapid, wide, uniform QRS complexes ('tombstones'). Action: Check for pulse. If pulse is present, prepare for Cardioversion/Amiodarone; if pulseless, treat as V-Fib.
- Asystole: Flat line. Action: Start high-quality CPR, administer Epinephrine. DO NOT DEFIBRILLATE a flat line!
Clinical Note: In Myocardial Infarction (MI), look for ST-segment elevation (STEMI). This represents active myocardial injury requiring immediate reperfusion therapy.
Study Tip: Draw normal and pathological ECG waves on cue cards and stick them on your study desk. Visual familiarity will help you spot deviations in seconds on exam day.
