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Frequency of CS in patients divided into four groups: patients with no symptoms and a normal ECG (n = zero out of 800), patients with symptoms but a normal ECG (n = one out of 51), patients with no symptoms but a pathologic ECG (n = 11 out of 126) and patients with symptoms and a pathologic ECG (n = 11 out of 40). Symptoms are palpitations, pre-syncope and syncope. **p < 0.01, ***p < 0.001 and ****p < 0.0001.
