Final answer:
In the case of a patient with coronary artery disease showing symptoms of cool toes, an absent distal peripheral pulse, and a rapid pulse post-arteriography, the most appropriate intervention would be to administer a vasodilator like nitroglycerin for improving peripheral blood flow.
Step-by-step explanation:
While assessing a client with coronary artery disease following a coronary arteriography, a nurse observes signs that may indicate a complication of the procedure, such as a possible arterial occlusion at the catheter insertion site, presenting as cool toes, an absent distal peripheral pulse, and a rapid pulse. The most appropriate intervention in this case (given the options provided) would be to administer a vasodilator. Vasodilators such as nitroglycerin can help improve blood flow to the ischemic area by dilating blood vessels. On the other hand, administering a beta blocker, calcium channel blocker, or diuretic might not address the immediate concern of improving blood flow to the affected extremity and could potentially worsen the symptoms or mask important clinical indicators.
It is essential to note that this is a potentially serious situation that requires immediate further assessment and intervention to address complications such as arterial occlusion, which can lead to tissue ischemia and necrosis if not promptly corrected.