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12-lead ECG normal sinus rhythm interpretation
Here is the ECG interpretation based on careful visual analysis of the tracing:
ECG Interpretation
Technical details (from the strip footer):
- Paper speed: 25 mm/s
- Gain: 10 mm/mV
- Filter: 50 Hz
- Heart rate: 60 bpm
- GE MAC 1 machine | Simultaneous 3-channel acquisition
Rate
~60 bpm — confirmed by the machine readout. Normal rate (normocardia).
Rhythm
Regular P waves preceding each QRS complex visible in limb leads → Sinus rhythm.
Axis
- Lead I: positive QRS
- aVF: appears positive/equiphasic
→ Normal axis (approximately 0° to +90°)
P Waves
- Appear present and upright in leads I, II, aVF
- Normal morphology, consistent with sinus origin
- PR interval appears normal (~160–180 ms)
QRS Complex
- Duration appears narrow (<120 ms) — no bundle branch block pattern visible
- No pathological Q waves clearly identifiable at this resolution
- R-wave progression in precordial leads (V1–V6): appears to show normal transition
ST Segments & T Waves
At the image resolution available:
- No obvious ST elevation in the inferior or anterior leads
- No obvious ST depression
- T waves appear broadly upright in most leads
- Lead aVR shows expected negative deflection
Intervals
| Parameter | Assessment |
|---|---|
| Heart rate | ~60 bpm (normal) |
| PR interval | ~160–180 ms (normal) |
| QRS duration | Narrow, <120 ms (normal) |
| QT/QTc | Cannot accurately measure at this resolution |
Impression
Normal sinus rhythm at 60 bpm with no acute ischemic changes identifiable at this resolution.
The overall tracing appears within normal limits: regular sinus rhythm, normal rate, normal axis, narrow QRS, no obvious ST-T wave abnormalities.
⚠️ Important caveat: This ECG is photographed at an angle on a table, making precise interval and amplitude measurements unreliable. For clinical decision-making, measurements should be confirmed from the original digital tracing or a high-quality flat scan. If this patient has symptoms (chest pain, dyspnea, syncope, palpitations), the ECG must be reviewed by a physician in the full clinical context.
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