ecg of a 33 years female . find the ecg abnormality
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Reading File
ECG Analysis - 33-Year-Old Female
Technical Calibration
- Paper speed: 25 mm/sec (standard)
- Important: Precordial leads (V1-V6) recorded at half-standard calibration (5 mm/mV) - all precordial voltages must be doubled for true values
- Limb leads at standard calibration (10 mm/mV)
Systematic Findings
| Parameter | Finding |
|---|---|
| Rate | ~75 bpm (normal) |
| Rhythm | Regular sinus rhythm |
| Axis | Normal (~+60 to +75°) |
| P waves | Normal morphology, normal duration |
| PR interval | ~160 ms (normal, 120-200 ms) |
| QRS duration | ~80 ms (narrow, no BBB) |
| QT/QTc | ~380 ms / QTc ~425 ms (normal for females <460 ms) |
Key Abnormalities
1. LEFT VENTRICULAR HYPERTROPHY (LVH) - PRIMARY FINDING
The ECG shows markedly elevated voltages in the precordial leads. Accounting for half-standard calibration:
- S wave in V2: ~18 mm on paper = 36 mm at true calibration
- R wave in V5: ~15 mm on paper = 30 mm at true calibration
- Sokolow-Lyon Index: S(V2) + R(V5) = 66 mm (threshold for LVH = >35 mm)
This is a strongly positive voltage criterion for LVH, nearly double the diagnostic threshold.
2. LV STRAIN PATTERN - SECONDARY REPOLARIZATION CHANGES
Associated with the severe LVH:
- Asymmetric T-wave inversions in lateral leads (I, aVL, V5, V6)
- Mild ST depression/flattening in lateral leads
- This "strain pattern" is characteristic of pressure or volume overload on the left ventricle
Clinical Summary
Diagnosis: Left Ventricular Hypertrophy with Strain Pattern
In a 33-year-old female, LVH of this severity should prompt urgent evaluation for:
- Hypertension - most common cause; needs BP measurement both arms
- Hypertrophic Cardiomyopathy (HCM) - especially important at this young age; can be life-threatening
- Aortic stenosis - valvular disease
- Coarctation of the aorta - congenital cause, particularly relevant in young females
Clinical Note: In a 33-year-old, this degree of LVH is not physiologically normal. An echocardiogram is mandatory to measure true wall thickness, assess ventricular function, and rule out HCM or structural heart disease. If HCM is confirmed, it has important implications including risk of sudden cardiac death and activity restrictions.
This ECG interpretation is for clinical decision-support only and should be reviewed by a qualified cardiologist alongside the patient's history, physical examination, and blood pressure readings.
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