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Interpretation of this ecg
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ECG large P wave V1 left atrial enlargement interpretation clinical significance
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ECG Interpretation - Silpa Mallick, 30-year-old Female
Patient & Technical Details
| Parameter | Value |
|---|---|
| Patient | Silpa Mallick, Female, 30 years |
| Date/Time | 20-07-2026, 03:12:40 PM |
| Paper speed | 25 mm/s |
| Gain | 10 mm/mV |
| Filter | 0.67-100 Hz AC50 |
Measured Intervals (from machine report)
| Interval | Value | Normal |
|---|---|---|
| Heart Rate | 96 bpm | 60-100 bpm |
| PR interval | 88 ms | 120-200 ms |
| QRS duration | 72 ms | <120 ms |
| QT/QTc | 307/388 ms | QTc <440 ms (F) |
| P/QRS/T | 344/80/35 | - |
| RVS/SV1 | 0.768/0.93 mV | - |
Step-by-Step Interpretation
1. Rhythm: Sinus Rhythm
Regular P waves precede every QRS complex. Rate is 96 bpm - normal sinus rhythm, upper end of normal.
2. PR Interval: SHORT at 88 ms (normal >/= 120 ms)
This is a notably short PR interval. Possible causes:
- Pre-excitation (WPW syndrome or variant) - accessory pathway bypasses the AV node. Check carefully for a delta wave (slurred upstroke of QRS).
- AV nodal/junctional rhythm with retrograde P waves - less likely as P waves appear upright in II.
- Low atrial rhythm - if the sinus impulse originates near the AV node.
This finding warrants further evaluation. If delta waves are present, WPW should be considered.
3. QRS Duration: 72 ms - Normal (no bundle branch block)
4. QTc: 388 ms - Normal for a female (cut-off 460 ms)
5. Key Finding: "Large P in V1" (Machine Diagnosis)
The machine flags this specifically. This indicates:
- Left Atrial Enlargement (LAE) - the hallmark is a deep, broad terminal negative deflection of the P wave in V1 (>1 mm deep, >40 ms duration), along with a broad, notched (bifid) P wave in lead II - classically called P-mitrale
ECG criteria for LAE per LITFL:
- Bifid P wave in lead II with >40 ms between peaks
- Terminal negative P wave in V1 >1 mm deep and/or >40 ms
Causes of LAE in a 30-year-old female:
- Mitral valve disease (mitral stenosis - most common cause of P-mitrale, mitral regurgitation)
- Hypertrophic cardiomyopathy (HCM)
- Hypertension
- Aortic valve disease
- Dilated cardiomyopathy
Machine Diagnosis Summary
The ECG machine reports:
- Sinus Rhythm - confirmed
- Large P in V1 - consistent with Left Atrial Enlargement
Clinical Summary
| Finding | Significance |
|---|---|
| Sinus rhythm, 96 bpm | Normal |
| Short PR (88 ms) | Abnormal - needs evaluation for pre-excitation/WPW |
| Normal QRS & QTc | Reassuring |
| Large P in V1 (LAE) | Suggests left atrial pressure/volume overload |
Recommended Next Steps
- Echocardiogram (priority) - to assess left atrial size, mitral valve morphology (especially rule out mitral stenosis in a young female from India), LV function, and any structural abnormality.
- Look for delta waves on the ECG carefully - if present, refer cardiology for WPW evaluation (risk of arrhythmia).
- Clinical correlation - symptoms of dyspnoea, palpitations, fatigue, or a history of rheumatic fever are relevant given this age group and geography.
- Thyroid function - mild sinus tachycardia with LAE can be seen in thyrotoxicosis.
Note: The short PR interval (88 ms) is the most clinically important abnormal finding not flagged by the machine and should not be overlooked. In a young woman, WPW or a pre-excitation variant must be excluded.
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