Patient 1. Pt is a 78 y.o male admitted for SOB with exertion. Pt is currently on 2LNC (baseline is RA). BNP was 7600. Pt is on tele NSR with a RBBB. AM labs K 3.0, Mag 1.2, dig level 2.6 ng/ml. Pt has a stress test scheduled for 0800. Pt complains of new leg pain. PMH of afib, CHF, DM diet controlled, HTN, hypercholesterolemia. VS: 168/76, P 102, RR 20, T 36.2 O2 99%, Pain 0 BS 88. Morning meds: Lasix 40mg IV, Spironolactone 20 mg PO, Mag oxide 400mg PO, Lopressor 25mg PO, Lisinopril 20mg PO, Losartan 100 mg PO, Duoneb Q 4 hours as needed, Atorvastatin 80 mg PO. Why is this test ordered for this patient?