Welcome to your ⚡ Adrenergic Pharmacology Arena
1.
A patient receives phenylephrine for marked hypotension. Blood pressure rises, but the heart rate decreases despite the absence of direct cardiac inhibitory activity. Which physiological response is responsible for the change in heart rate?
2.
A patient with hypertension is started on a β-blocker that also has partial agonist activity at β receptors. At rest, his heart rate decreases less than expected compared with a pure antagonist. Which drug most likely has this property?
3.
A patient taking oral propranolol shows considerable variation in plasma drug concentration despite receiving the same dose. Which pharmacokinetic characteristic most contributes to this variability?
4.
A pharmacologist compares two sympathomimetics. Drug A stimulates both α- and β-adrenoceptors and is effective in anaphylaxis. Drug B is a relatively selective α₁ agonist that increases peripheral resistance but can cause reflex bradycardia. Which pair correctly identifies these drugs?
5.
During dopamine infusion, a patient initially demonstrates vascular effects in renal and mesenteric beds. With a moderate increase in infusion rate, myocardial contractility rises significantly. Which change in receptor predominance best explains this transition?
6.
A pharmacology experiment shows that a drug does not directly activate adrenergic receptors but markedly increases sympathetic activity by releasing stored noradrenaline from nerve terminals. Which classification best describes this drug?
7.
A patient receiving an MAO inhibitor is inadvertently given an indirectly acting sympathomimetic and develops severe hypertension. Why is this interaction particularly dangerous?
8.
A 59-year-old hypertensive patient taking prazosin reports marked dizziness after getting out of bed in the morning. His blood pressure falls significantly on standing. Which physiological response has been most impaired?
9.
A 22-year-old woman develops wheezing, facial swelling and profound hypotension shortly after an intravenous antibiotic. Adrenaline is administered. Which combination of receptor effects most directly explains its ability to simultaneously improve airway obstruction and arterial pressure?
10.
A 66-year-old man with intermittent claudication is prescribed a non-selective β-blocker. His cold extremities and exercise-related leg discomfort become worse. Which mechanism best explains this change?
11.
A patient with diabetes mellitus uses insulin and is started on a non-selective β-blocker. Several weeks later, he experiences hypoglycemia but notices fewer warning palpitations than before. Which additional concern is most relevant with non-selective β blockade?
12.
A patient with acutely elevated intraocular pressure receives a drug intravenously that increases plasma osmolarity. Soon afterward, water moves from ocular tissues into the circulation. Which treatment was most likely administered?
13.
A patient taking propranolol develops vivid dreams and sleep disturbance. Which property of the drug most directly contributes to these central nervous system effects?
14.
A pharmacology student compares several β-blockers and notes that one drug can produce local-anesthetic-like sodium-channel blockade at concentrations higher than those needed for β-receptor antagonism. Which drug is a recognized example?
15.
Two sympathomimetic drugs are compared experimentally. Drug X raises both systolic and diastolic pressure with reflex slowing of the pulse. Drug Y produces prominent tachycardia while diastolic pressure falls. Which pair best corresponds to Drug X and Drug Y, respectively?
16.
A patient receiving excessive sympathomimetic therapy develops palpitations, tremor and anxiety. Which explanation best links these adverse effects to the drug's pharmacology?
17.
A patient receiving a non-selective β-blocker develops severe wheezing shortly after treatment. He has a history of reactive airway disease. Which normal sympathetic action has been inhibited?
18.
A patient with glaucoma receives acetazolamide. The drug lowers intraocular pressure without directly stimulating adrenergic receptors. Which sequence best explains its therapeutic action?
19.
A patient receiving dopamine has improved cardiac output at one infusion rate. When the infusion is substantially increased, systemic vascular resistance rises and peripheral vasoconstriction becomes prominent. Which receptor has become increasingly important?
20.
A 63-year-old man with chronic stable heart failure is clinically stable on standard therapy. A β-blocker is added because long-term reduction of excessive sympathetic stimulation can improve cardiac function and remodeling. Which drug has established usefulness in this setting?
21.
A patient in anaphylactic shock has hypotension caused partly by widespread vasodilation and increased vascular permeability. Following adrenaline administration, vascular tone improves and mucosal swelling decreases. Which receptor action is mainly responsible for these effects?
22.
A patient is prescribed an orally active sympathomimetic that has a longer duration of action than adrenaline. Which property most likely contributes to this difference?
23.
A 35-year-old man is brought to the emergency department after ingesting a large amount of a β-blocker. He has marked bradycardia, hypotension and depressed myocardial contractility. A drug is given that increases cardiac cyclic AMP through a pathway independent of β-adrenoceptors. Which drug is most appropriate?
24.
During a pharmacology experiment, adrenaline produces an increase in arterial pressure before administration of an α-blocker. After adequate α-receptor blockade, the same dose of adrenaline lowers arterial pressure. Which receptor effect becomes dominant after the blockade?
25.
A patient receives a non-selective α-adrenoceptor antagonist. Compared with a selective α₁ blocker, he develops more prominent reflex tachycardia. Which additional receptor blockade best explains this finding?
26.
A researcher compares adrenaline with noradrenaline. At a dose producing prominent β₂ effects, adrenaline lowers vascular resistance in some vascular beds, whereas noradrenaline does not. Which pharmacological difference best explains this observation?
27.
A sympathomimetic drug increases heart rate markedly while reducing diastolic blood pressure because of vasodilation in skeletal-muscle vascular beds. Which receptor profile best accounts for these findings?
28.
A 50-year-old hypertensive patient is treated with a β-blocker. His plasma renin activity falls during treatment. Blockade of which receptor population is responsible for this effect?
29.
A 66-year-old patient with glaucoma requires a drug that reduces aqueous humour production through adrenergic receptor stimulation. Which mechanism is most appropriate?
30.
A 68-year-old man with urinary hesitancy and poor urinary stream is treated with a drug that improves urine flow with relatively little effect on systemic blood pressure. Which receptor profile best explains this action?
31.
A 57-year-old man with exertional angina is prescribed a β-blocker. During follow-up, his exercise-induced chest pain becomes less frequent. Which combination of cardiac effects best explains the therapeutic benefit?
32.
A patient with supraventricular tachyarrhythmia receives a β₁-blocker. His ventricular rate decreases because conduction through the atrioventricular node slows. Which pharmacological effect best describes this action?
33.
A patient being treated with a monoamine oxidase inhibitor develops severe headache, palpitations and marked hypertension after consuming a meal containing aged fermented food. Which sequence best explains this reaction?
34.
A 58-year-old man with hypotension receives an adrenergic agonist. His systolic and diastolic blood pressures rise markedly, but his pulse falls from 92/min to 68/min. The drug has strong α-receptor activity with some β₁ action and little β₂ activity. Which drug best explains this response?
35.
A 49-year-old man taking a monoamine oxidase inhibitor asks which meal presents the greatest risk of a dangerous adrenergic interaction. Which choice is most concerning?
36.
A 42-year-old man with mild bronchial asthma requires a β-blocker for a compelling cardiac indication. Which pharmacological property is most desirable to reduce the risk of bronchospasm?
37.
A 46-year-old man with episodic headache, sweating and severe hypertension is diagnosed with a catecholamine-secreting tumor. He is started on an α-adrenoceptor antagonist before definitive treatment. Which pharmacological effect is most important in preventing catecholamine-induced hypertension?
38.
A researcher describes a β-blocker that not only prevents catecholamines from activating β receptors but also reduces constitutive receptor activity in the absence of agonist. Which pharmacological property is being described?
39.
A 35-year-old patient accidentally receives an excessive dose of adrenaline and develops severe hypertension with evidence of intense peripheral vasoconstriction. Which drug would most directly antagonize the receptor mechanism responsible for this vascular effect?
40.
A 61-year-old man with chronic stable heart failure is prescribed a drug that decreases sympathetic cardiac stimulation while also reducing peripheral vascular resistance through α₁ blockade. Which drug best fits this combined mechanism and clinical use?
