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svt or afib
SVT (Supraventricular Tachycardia) - and the answer sheet already has it checked off correctly.
Here's why, based on the ECG and clinical picture:
ECG Analysis
Key findings on this tracing:
- Rate ~178 bpm (very fast)
- Regular rhythm - the R-R intervals are consistent and even
- Narrow QRS complexes - the ventricular complexes look narrow/normal width
- P waves are either absent or buried in the preceding T wave (retrograde or hidden)
Why SVT, not AFib?
| Feature | This ECG | AFib | SVT |
|---|---|---|---|
| Rhythm | Regular | Irregularly irregular | Regular |
| QRS | Narrow | Narrow | Narrow |
| P waves | Hidden/absent | Absent (fibrillatory baseline) | Absent or retrograde |
| Rate | 178 bpm | Variable 100-180 | 150-250 |
AFib is ruled out because the rhythm is regular. AFib is characteristically irregularly irregular with no discernible P waves and a chaotic baseline. This rhythm is too regular and organised for AFib.
The Student's Answers
Part a) SVT - Correct ✓
Part b) Stable patient - Good answers:
- Continuous cardiac monitoring ✓
- Vagal manoeuvres (Valsalva, carotid sinus massage) ✓
- IV access for adenosine ✓ - adenosine 6mg rapid IV push is first-line for SVT
- Monitor vitals frequently, O2 ✓
Part c) Unstable patient - Good answers:
- Call for help / code blue ✓
- Apply O2, obtain IV access ✓
- Synchronised cardioversion ✓ - this is the correct intervention for unstable SVT (not defibrillation - it must be synchronised to avoid inducing VF)
- Sedation ✓ - given before cardioversion if time allows
Overall this is a well-answered question. The key clinical reasoning point: regularity = SVT, irregularity = AFib.
choose 1 i think its afib
The answer is SVT, not AFib.
The single most important distinguishing feature:
AFib = irregularly irregular rhythm. This ECG is regular.
Look at the V1 rhythm strip at the bottom of the tracing - the R-R intervals are evenly spaced, beat to beat. That rules out AFib immediately. AFib would show chaotic, unpredictable spacing between QRS complexes with no two intervals the same.
The answer sheet is correct - it's Supraventricular Tachycardia (SVT).
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