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ECG Analysis - 12-Lead
Patient Details (from printout): Female, age ~10 years, HR: 51 bpm
Primary Abnormality: Sinus Bradycardia
Heart rate of 51 bpm is below the normal range for a child of this age (normal resting HR for a 10-year-old is typically 70-110 bpm), making this bradycardia more clinically significant than it would be in an adult.
Systematic Analysis
| Parameter | Finding |
|---|---|
| Rate | 51 bpm - Sinus Bradycardia |
| Rhythm | Regular sinus rhythm |
| Axis | Normal (~+60 to +70°) |
| P waves | Normal - upright in I, II, aVF; inverted in aVR |
| PR interval | Normal (~160 ms) |
| QRS duration | Normal (~80-90 ms), narrow - no bundle branch block |
| QT/QTc | Visually within normal limits |
| ST segments | Isoelectric - no elevation or depression |
| T waves | Normal; flat/inverted in V1 (normal variant) |
| Q waves | No pathological Q waves |
Lead-by-Lead Summary
- Limb leads (I, II, aVF): Normal upright P-QRS-T. Small flat T in III and aVF - normal variant.
- aVR: Inverted P, negative QRS, inverted T - normal findings for this lead.
- aVL: Small amplitude, flat T - normal variant.
- V1: rS pattern with flat/slightly inverted T - normal.
- V2-V6: Normal R-wave progression, isoelectric ST segments, upright T waves.
Conclusion
The only ECG abnormality is Sinus Bradycardia (51 bpm). The rest of the ECG is essentially normal - no ischemia, no infarction pattern, no hypertrophy, no conduction defects.
Clinical significance in a child: For a ~10-year-old female, a resting HR of 51 bpm is notably slow. This warrants evaluation for:
- Hypothyroidism (most common endocrine cause)
- Increased vagal tone (well-trained young athlete)
- Medications (beta-blockers, digoxin)
- Raised intracranial pressure
- Sick sinus syndrome (rare but possible)
- Eating disorders (anorexia nervosa - common cause of bradycardia in adolescent females)
If the child is symptomatic (dizziness, syncope, fatigue, exercise intolerance), further workup including thyroid function tests, a Holter monitor, and clinical correlation is advised.
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