Interpretation
Reading File
Based on the ECG image provided, here is a systematic interpretation:
ECG Interpretation
Patient context noted: BSL 188 mg/dl (elevated blood sugar — likely diabetic)
Rate
Approximately 75–90 bpm — normal rate.
Rhythm
Sinus rhythm — P waves appear present before QRS complexes in limb leads.
Axis
Appears to be in normal axis range based on lead I and aVF morphology.
Key Findings
1. Wide QRS Complexes
The QRS complexes appear broad/widened (>120 ms) across multiple leads — this is the most striking feature.
2. Left Bundle Branch Block (LBBB) pattern
- Broad, notched R waves in lateral leads (I, aVL, V5, V6)
- Deep S or QS pattern in V1
- ST-T changes discordant to QRS (ST depression/T-wave inversion in leads with dominant R wave) — these are secondary ST-T changes expected in LBBB and do not independently indicate ischemia
3. No obvious acute STEMI pattern
However, in the setting of LBBB, Sgarbossa criteria should be applied to evaluate for concurrent STEMI:
- Concordant ST elevation ≥1 mm in a lead with positive QRS
- Concordant ST depression ≥1 mm in V1–V3
- Discordant ST elevation ≥5 mm (less specific)
From the tracing, there is discordant ST-T pattern consistent with uncomplicated LBBB rather than meeting Sgarbossa criteria — but clinical correlation is essential.
4. Prominent QRS in precordial leads
Tall R waves in V5–V6 with deep S in V1–V2 suggest possible left ventricular hypertrophy (LVH), which commonly co-exists with LBBB in hypertensive/diabetic patients.
Impression
| Finding | Interpretation |
|---|---|
| Rhythm | Normal sinus rhythm |
| Rate | ~75–90 bpm |
| QRS duration | Prolonged (wide QRS) |
| Pattern | Left Bundle Branch Block (LBBB) |
| ST-T changes | Secondary (expected in LBBB) |
| Clinical context | Elevated BSL — diabetic patient |
Clinical Correlation Required
- New LBBB in a symptomatic patient (chest pain, dyspnea) should be treated as an ACS equivalent until proven otherwise.
- If this is old/chronic LBBB, it may reflect underlying cardiomyopathy, hypertension, or coronary artery disease.
- Comparison with prior ECGs is strongly recommended.
- Troponin, echo, and clinical symptoms must be assessed.
⚠️ This ECG analysis is for educational reference only. Clinical decisions must be made by a qualified physician with full patient context.
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