After a STEMI, a pt suddenly experiences a decreased level consciousness, a weak and thready pulse and posterior crackles in the lower half of the lung fields bilaterally. Data are as follows
BP 76/43
HR 139
RR 24
UO 5 ml for the past hour
O2 sat 88% on 2 L via nasal (from 97%)
The nurse should suspect which of the ff causes
A. CVA
B. cardiogenic shock
c. pulmonary embolus
D. ARDS