2. B receptor antagonists u 2.2 Pharmacological effects 1)B receptor blockade D A. Cardiovascular effects Depressing heart: reduction in HR, A-v conduction, automaticity, cardiac output, oxygen consumption u Hypotension: hypotensive effects only in ypertensive patients; peripheral blood flow t BP 1 in normal subjects.2.2 Pharmacological effects (1)  receptor blockade A. Cardiovascular effects： Depressing heart: reduction in HR, A-V conduction, automaticity, cardiac output, oxygen consumption Hypotension: hypotensive effects only in hypertensive patients; peripheral blood flow , BP  in normal subjects. 2.  receptor antagonists