Absolute
- Patient refusal
- Irreversible or end-stage cardiac disease 1
- Aortic regurgitation (anything more than mild) 1
- Aortic dissection 1
- Aortic stents 1
- Severe aortic atheromatous disease 1
- Severe peripheral vascular disease 1
Relative
- Severe neurological deficit 1
- Compromising tachyarrhythmias 1
- Abdominal aortic aneurysm 1
- Sepsis 1
- Arterial tortuosity 1
- Contraindications to anticoagulation including coagulopathy and HIT 1
- LVOT obstruction 1