The nurse has received the change-of-shift report on the clients. Who should the nurse assess first?

a client with first-degree heart block and a heart rate of 62 who is dizzy when ambulating
a client who had a temporary pacemaker inserted 2 hours ago, who is now pacing 1:1 with a heart rate of 70
a client newly admitted after the implantable cardioverter-defibrillator (ICD) fired twice who has a dose of amiodarone due
a client with atrial fibrillation who is scheduled to go the cardiac catheterization lab at 10 am (1000) for an ablation