Question 1

An antiarrhythmic drug used to treat bradycardia inadvertently creates tachycardia.The most likely reason is that this drug causes _____ of the ______.

Accepted Answer

A)  inhibition; sinoatrial node 
B)  excitation; sinoatrial node 
C)  inhibition; bundle of His 
D)  excitation; bundle of His 
E)  inhibition; atrioventricular node 
A)  inhibition; sinoatrial node 
B)  excitation; sinoatrial node 
C)  inhibition; bundle of His 
D)  excitation; bundle of His 
E)  inhibition; atrioventricular node B

Question 2

Which of the following drug categories is NOT used to treat cardiac arrhythmias?

Accepted Answer

A)  sodium channel blockers 
B)  chloride channel blockers 
C)  beta blockers 
D)  calcium channel blockers 
E)  drugs that prolong cardiac repolarization 
A)  sodium channel blockers 
B)  chloride channel blockers 
C)  beta blockers 
D)  calcium channel blockers 
E)  drugs that prolong cardiac repolarization B

Question 3

Beta blockers are effective in treating certain cardiac arrhythmias because they _____ the excitatory effects of ______ on the heart

Accepted Answer

A)  increase; acetylcholine 
B)  decrease; acetylcholine 
C)  increase; catecholamines (epinephrine and norepinephrine) 
D)  decrease; catecholamines (epinephrine and norepinephrine) 
E)  increase; beta interferons 
A)  increase; acetylcholine 
B)  decrease; acetylcholine 
C)  increase; catecholamines (epinephrine and norepinephrine) 
D)  decrease; catecholamines (epinephrine and norepinephrine) 
E)  increase; beta interferons D

Question 4

An antiarrhythmic drug that prolongs the effective refractory period of the cardiac action potential

Accepted Answer

A)  will speed up repolarization of cardiac muscle cells 
B)  will generally increase heart rate 
C)  will decrease the time interval between cardiac action potentials 
D)  all the above are true 
E)  none of the above are true 
A)  will speed up repolarization of cardiac muscle cells 
B)  will generally increase heart rate 
C)  will decrease the time interval between cardiac action potentials 
D)  all the above are true 
E)  none of the above are true

Question 5

Calcium channel blockers are useful in treating certain cardiac arrhythmias because they

Accepted Answer

A)  decrease the rate of discharge of the SA node 
B)  increase conduction velocity through the AV node 
C)  block the effects of catecholamines (epinephrine, norepinephrine) on cardiac tissues 
D)  inhibit the ability of sodium to excite cardiac membranes 
E)  none of the above are true; calcium channel blockers are not used to treat arrhythmias 
A)  decrease the rate of discharge of the SA node 
B)  increase conduction velocity through the AV node 
C)  block the effects of catecholamines (epinephrine, norepinephrine) on cardiac tissues 
D)  inhibit the ability of sodium to excite cardiac membranes 
E)  none of the above are true; calcium channel blockers are not used to treat arrhythmias

Question 6

Depending on the dose and route of administration,lidocaine and similar drugs can be used as local anesthetics or cardiac antiarrhythmic drugs because these drugs affect the excitability of _____ ion channels.

Accepted Answer

A)  sodium 
B)  potassium 
C)  chloride 
D)  calcium 
E)  magnesium 
A)  sodium 
B)  potassium 
C)  chloride 
D)  calcium 
E)  magnesium

Question 7

While attempting to control one type of arrhythmia,antiarrhythmic drugs can exert "proarrhythmic" effects,which are indicated by

Accepted Answer

A)  a delay of 4 to 6 weeks before these drugs become effective 
B)  common musculoskeletal abnormalities such as skeletal muscle fasciculations 
C)  their ability to aggravate or initiate other cardiac rhythm abnormalities 
D)  their ability to aggravate the proton pump in the stomach, resulting in gastric ulcers 
E)  their ability to increase body temperature and cause fever 
A)  a delay of 4 to 6 weeks before these drugs become effective 
B)  common musculoskeletal abnormalities such as skeletal muscle fasciculations 
C)  their ability to aggravate or initiate other cardiac rhythm abnormalities 
D)  their ability to aggravate the proton pump in the stomach, resulting in gastric ulcers 
E)  their ability to increase body temperature and cause fever

Exam 23: Treatment of Cardiac Arrhythmias

An antiarrhythmic drug used to treat bradycardia inadvertently creates tachycardia.The most likely reason is that this drug causes _____ of the ______.

Which of the following drug categories is NOT used to treat cardiac arrhythmias?

Beta blockers are effective in treating certain cardiac arrhythmias because they _____ the excitatory effects of ______ on the heart

An antiarrhythmic drug that prolongs the effective refractory period of the cardiac action potential

Calcium channel blockers are useful in treating certain cardiac arrhythmias because they

Depending on the dose and route of administration,lidocaine and similar drugs can be used as local anesthetics or cardiac antiarrhythmic drugs because these drugs affect the excitability of _____ ion channels.

While attempting to control one type of arrhythmia,antiarrhythmic drugs can exert "proarrhythmic" effects,which are indicated by

Basic Principles of Pharmacology

Pharmacokinetics IDrug Administration,Absorption,and Distribution

Pharmacokinetics II: Drug Elimination

Drug Receptors

General Principles of Central Nervous System Pharmacology

Sedative Hypnotic and Anti-anxiety Agents

Drugs to Treat Affective Disorders Depression and Bipolar Syndrome

Antipsychotic Drugs

Antiepileptic Drugs

Pharmacologic Management of Parkinson Disease

General Anesthetics

Local Anesthetics

Skeletal Muscle Relaxants

Opioid Analgesics

Non-steroidal Anti Inflammatory Drugs

Pharmacologic Management of Rheumatoid Arthritis and Osteoarthritis

Patient Controlled Analgesia

Introduction to Autonomic Pharmacology

Cholinergic Drugs

Adrenergic Drugs

Antihypertensive Drugs

Treatment of Angina Pectoris

Treatment of Congestive Heart Failure

Treatment of Coagulation Disorders and Hyperlipidemia

Respiratory Drugs

Gastrointestinal Drugs

Introduction to Endocrine Pharmacology

Adrenocorticosteroids

Male and Female Hormones

Thyroid and Parathyroid Drugs: Agents Affecting Bone Mineralization

Pancreatic Hormones and the Treatment of Diabetes Mellitus

Treatment of Infections I: Antibacterial Drugs

Treatment of Infections II: Antiviral Drugs

Treatment of Infections III: Antifungal and Antiparasitic Drugs

Cancer Chemotherapy

Immunomodulating Agents

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An antiarrhythmic drug used to treat bradycardia inadvertently creates tachycardia.The most likely reason is that this drug causes _ of the __.

Beta blockers are effective in treating certain cardiac arrhythmias because they _ the excitatory effects of __ on the heart