Pune cardiologist Dr. Jagjeet Deshmukh explains 'Holiday Heart Syndrome,' a condition where irregular heart rhythms like atrial fibrillation can occur during or after festive occasions. Triggers include high-calorie foods, excessive alcohol, disrupted sleep, and stress. Older adults, individuals with pre-existing conditions like hypertension or diabetes, and those unaccustomed to sudden binge drinking or intense activity are most vulnerable. Dr. Deshmukh advises celebrating safely to protect heart health.