Read this ecg and identify
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ECG Interpretation
Technical details: 25 mm/s paper speed, 10 mm/mV gain, AC50Hz filter. Vertical format (leads run top to bottom), arranged in columns: I, II, III, aVR, aVL, aVF, V1-V6.
Key Findings
1. Rhythm
- The rhythm appears regularly irregular or rapid and regular across all leads.
- The limb leads (I, II, III, aVR, aVL, aVF) show relatively narrow, somewhat small complexes with a rapid rate.
2. Heart Rate
- Estimated 100-150 bpm based on R-R interval spacing on the 25 mm/s strip.
3. The most striking finding - Precordial leads (V1-V6)
- There are wide, bizarre, high-amplitude QRS complexes in V2-V5, with a sinusoidal or large oscillating morphology.
- The amplitude is markedly increased compared to the limb leads.
- The morphology is grossly abnormal - the complexes are wide and have a pattern inconsistent with normal ventricular conduction.
Primary Diagnosis
Ventricular Tachycardia (VT)
The findings most consistent with this ECG are:
| Feature | Finding |
|---|---|
| QRS morphology | Wide (>120 ms), bizarre in precordial leads |
| Amplitude | High-amplitude, large sinusoidal-like complexes in V2-V5 |
| Rate | Rapid (~120-150 bpm estimated) |
| Limb leads | Relatively smaller complexes, consistent with VT axis |
| AV dissociation | Likely present (P waves not clearly associated with QRS) |
The broad, high-amplitude complexes across the precordial leads with the large sinusoidal morphology in V2-V5 is classic for monomorphic VT or, if the morphology is varying, polymorphic VT / Torsades de Pointes.
Differential Diagnosis
- Monomorphic VT - most likely (regular, wide QRS)
- SVT with aberrant conduction / bundle branch block - less likely given the extreme QRS amplitude and morphology
- Hyperkalemia with wide QRS tachycardia - possible if context suggests it (peaked T waves, sine-wave pattern)
- Antidromic AVRT (WPW) - possible but less likely without pre-excitation history
Suggested Actions
- This is a medical emergency if the patient is hemodynamically unstable - immediate synchronized DC cardioversion is indicated.
- If stable: IV amiodarone (150 mg bolus) or procainamide per ACLS protocol.
- Check electrolytes urgently (K+, Mg2+).
- Obtain prior ECG to compare for baseline bundle branch block or WPW.
- Cardiology/ICU consult immediately.
Disclaimer: This ECG interpretation is for educational purposes. Clinical correlation by a qualified physician is mandatory. Do not make treatment decisions based solely on this analysis.
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