This topic contains a solution. Click here to go to the answer

Author Question: What class of antiarrhythmics drug blocks potassium channels, prolonging phase 3 of the action ... (Read 22 times)

lindiwe

  • Hero Member
  • *****
  • Posts: 577
What class of antiarrhythmics drug blocks potassium channels, prolonging phase 3 of the action potential and slowing the rate and conduction of the heart?
 
  A) I
  B) II
  C) III
  D) IV

Question 2

A 3-year-old girl with a diagnosis of spasticity caused by cerebral palsy has been admitted to the unit. The physician has ordered dantrolene to see if it relieves the spasticity in the child's arms and hands.
 
  The nurse would schedule this child for what routine screenings? A) Central nervous system and gastrointestinal (GI) function
  B) Respiratory and cardiovascular (CV) function
  C) Growth and development
  D) Renal and hepatic function



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

dlook33

  • Sr. Member
  • ****
  • Posts: 344
Answer to Question 1

C
Feedback:
The class III antiarrhythmics block potassium, prolonging phase 3 of the action potential, which prolongs repolarization and slows the rate and conduction of the heart. Class I drugs block the sodium channels in the cell membrane during an action potential. Class II drugs are beta-adrenergic blockers that block beta-receptors, causing a depression of phase 4 of the action potential. Class IV drugs block calcium channels in the cell membrane leading to a depression of depolarization and a prolongation of phases I and II of repolarization, which slows automaticity.

Answer to Question 2

A
Feedback:
Children prescribed dantrolene should be routinely and regularly screened for central nervous system and gastrointestinal (including hepatic) toxicity. Growth and development should be routinely screened in all children. Renal, respiratory, and CV screening is not indicated.




lindiwe

  • Member
  • Posts: 577
Reply 2 on: Jul 23, 2018
Gracias!


samiel-sayed

  • Member
  • Posts: 337
Reply 3 on: Yesterday
Excellent

 

Did you know?

More than one-third of adult Americans are obese. Diseases that kill the largest number of people annually, such as heart disease, cancer, diabetes, stroke, and hypertension, can be attributed to diet.

Did you know?

In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

Did you know?

Throughout history, plants containing cardiac steroids have been used as heart drugs and as poisons (e.g., in arrows used in combat), emetics, and diuretics.

Did you know?

The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.

Did you know?

The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.

For a complete list of videos, visit our video library