Contra-indications
- Decompensated heart failure
- Uncontrolled hypertension
- Refractory arrhythmia
- severe contrast medium allergy
- inability for patient cooperation
- pregnancy
- active infection
- severe renal failure
- coagulopathy / anticoagulant state ( high INR / PT)
- severe hemorrhage
- intoxication (digitalis)
- electrolyte disturbance (hypokaliema)