Selective visceral artery angiography may be required to demonstrate anatomical detail and collateral patterns, to confirm severity of the disease, and to identify tandem lesions. Modest systemic anticoagulation (40 units/kg) is highly recommended prior to attempt selective catheterization. The choice of catheter shape is dependent upon access site, angle of origin, and individual preference (Table 8.1). For example, a multipurpose catheter (MPA, Fig. 8.4) is ideal for approaching the mesenteric arteries from brachial approach, whereas a secondary curve catheter (e.g., SOS or Simmons) is needed when these arteries are accessed via the femoral access. Other catheter shapes or guide catheters (Fig. 8.5) are useful for approaching the mesenteric arteries via either approach and may provide better support to assist with stent placement or other intervention.