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ECG interpretation 12-lead normal sinus rhythm

Finding Sources
Here is a systematic interpretation of the ECG based on careful visual analysis of the image:

ECG Interpretation

Technical details (from the strip header):
  • Speed: 25 mm/s
  • Filter: 0.05–35 Hz
  • AC: 50 Hz
  • Gain: 10 mm/mV
  • Dated: 23-4-26 (April 23, 2026)

Systematic Analysis

1. Rate The RR intervals appear regular and of moderate distance. Estimated ventricular rate is approximately 75–90 bpm (normal range).
2. Rhythm P waves appear to precede each QRS complex consistently across visible leads. This is consistent with normal sinus rhythm.
3. P Waves P waves are visible and upright in the limb leads (I, II), suggesting normal sinus origin with normal atrial depolarization.
4. PR Interval Appears within normal range (~120–200 ms) — no obvious prolongation or shortening visible.
5. QRS Complex
  • QRS complexes appear narrow (< 120 ms), indicating normal ventricular conduction (no bundle branch block)
  • QRS morphology in V1–V3 shows expected rS pattern with progressive R-wave development across the precordial leads
  • No obvious pathological Q waves are clearly identifiable at this image resolution
6. ST Segments
  • The ST segments appear to be at or near baseline across most leads
  • No obvious gross ST elevation or depression that would suggest an acute STEMI
  • The precordial leads (V1–V6) do not show clear ST elevation
7. T Waves
  • T waves appear generally upright in lateral leads
  • No obvious symmetric deep T-wave inversions suggesting ischaemia
8. QT Interval Appears grossly normal; no obvious prolongation.
9. Axis QRS complex in lead I appears positive and in aVF appears positive, suggesting a normal electrical axis (~0° to +90°).

Overall Impression

Normal sinus rhythm with no definitive acute ischaemic changes identified on this tracing.
However, this is a photo of a paper ECG taken at an angle with partial obstruction and limited resolution — subtle findings (mild ST changes, small Q waves, T-wave abnormalities) cannot be reliably excluded from visual inspection of a photograph.

Important Caveats

⚠️ This analysis is for educational/informational purposes only. A cardiologist's formal interpretation is mandatory for clinical decisions — the strip itself notes "Doctor: CARDIOLOGIST" at the bottom. The accompanying blood work shows:
  • Haemoglobin: 13.3 g/dL (borderline low, especially if male)
  • Platelets: 239,000/mm³ (normal)
  • Lymphocytes 50%, Monocytes 40% — elevated monocytes warrant clinical correlation
  • Diagnostic flags: Microcytosis and Anisocytosis — suggesting possible iron-deficiency or thalassaemia trait
The complete clinical picture (symptoms, history, physical exam) is essential for proper management.
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