Beta Adrenergic Antagonists Flashcards
All available beta blockers are ____________ (competetive/noncompetetive) antagonists
Competetive
Beta blockers do not induce postural hypotension. Why is that?
Alpha adrenoceptors are functional therefore normal sympathetic control of vasculature is maintained.
What are beta blockers used for?
Hypertension Angina Cardiac arrhythmias Myocardial Infarction Heart failure Hyperthyroidism Glaucoma Migraine headaches
Beta adrenoceptor antagonists _________ (increase/decrease) blood pressure, possibly because of their combined effects on heart, RAAS, and CNS.
Decrease
Beta blockers have ___________(positive/negative) chronotropic and inotropic effects
Negative
How do Beta blockers produce bradycardia?
They depress sinoatrial and atrioventricular nodal activity
Beta-1 Blockers are useful in treating angina. Why is that so?
Cardiac output, workload, oxygen consumption is decreased by the blockade of Beta-1 receptors
Beta blockers are effective in attenuating _____________ (supraventricular/ventricular) cardiac arrhythmias.
Supraventricular arrhythmias
Beta blockers are not effective against ___________ (supraventricular/ventricular) arrhythmias, except those induced by exercise.
Ventricular
B1 receptors mediate ______________ (tachycardia/vasodilation)
tachycardia
B2 receptors upon stimulation produces _________ (bronchodilation/bronchoconstriction)
bronchodilation
B1 receptors are mainly found on the _________ (heart/blood vessels)
heart
B2 receptors are mainly found on the _________ (heart/blood vessels)
blood vessels
____ (B1/B2) receptors increase myocardial contractility
B1
B2 receptor upon stimulation increases ___________ (lipolysis/glycogenolysis)
glycogenolysis (in liver and muscles)