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**I'm not a doctor, and this is not medical advice or a diagnosis.** ECG interpretations depend on the full clinical picture (age, symptoms, medications, other tests, heart history), so your father needs a proper follow-up with his physician or a cardiologist—ideally soon, since the doctor rushed. Bring a list of symptoms, meds, and questions to that visit. If he's having chest pain, severe dizziness, fainting, shortness of breath, or extreme fatigue, seek urgent care or ER evaluation now.

### Quick, factual breakdown of the report
- **Sinus bradycardia**: The heart's natural pacemaker (sinus node) is firing, but the rate is slower than the typical 60–100 bpm at rest—often under 60. It can be normal in fit/athletic people, during sleep, or from vagal tone. In older adults it may reflect aging of the conduction system or external factors.
- **First-degree AV block**: The electrical signal from atria to ventricles (via the AV node) takes a bit longer than usual (PR interval >200 ms on ECG), but every beat still gets through. It's the mildest form of AV block and is often asymptomatic and benign.

Together, these are fairly common ECG findings, especially in older adults. They don't usually cause immediate danger like higher-degree blocks or complete heart block. Many people live with them without issues.

### When it might need attention
It can be triggered by:
- Medications (beta-blockers, calcium channel blockers, digoxin, some anti-arrhythmics).
- Electrolyte shifts, hypothyroidism, sleep apnea, or dehydration.
- Underlying heart disease (ischemia, cardiomyopathy, infiltrative conditions) or simply age-related changes.

**Worry level summary**:
- If your father feels fine (no syncope, lightheadedness, exercise intolerance, or palpitations), this is often monitored rather than treated urgently.
- Further tests (Holter monitor, echo, labs) may be ordered to check for progression or reversible causes.
- Rarely, if symptomatic or the block worsens, a pacemaker could be considered later.

Again, only the doctor who knows his full history can weigh this. Ask specifically: "Is the rate low enough to cause symptoms? Any reversible cause? Follow-up testing or medication review needed?" In the meantime, track resting heart rate/pulse and symptoms. This finding alone is not usually an emergency, but professional review closes the loop.