The investigators thought to explore arrhythmias outcome - hidden arrhythmias, ECG features: Tp-Te interval and Tp-Te/QTc ratio, fQRS among patients with coronary artery ectasia as compared to normal coronary artery patients.

All patients will be subjected to:

A. Full history taking:

- Including age, sex, history of DM, HTN, dyslipidemia and Body surface area.

B. Holter monitoring for 24 hours:

• Heart rate variability
• Hidden arrhythmias
• Hidden ischemia by monitoring ST segment changes

C. Twelve lead ECG:

• fQRS in baseline ECG
• QT dispersion.
• Tp-Te interval and Tp-Te/QTc ratio
• Tp-Te dispersion

Inclusion Criteria:

• Subjects with suspected CAD who are referred for elective coronary angiography and/or interventions

Exclusion Criteria:

1. Patients with a history of cardiomyopathy and myocardial infarction (MI), left ventricular hypertrophy (LVH), pathological Q wave on ECG, typical left bundle block or right bundle block, incomplete right bundle block, or paced rhythm on ECG.
2. Patients with severe renal impairment
3. Post CABG patients
4. Patients of acute coronary syndrome

The study will include consecutive eligible patients recruited in Assiut University Heart Hospital