Cardiac Glycosides

Question 1

Digitalis glycosides

Answer 1

Found in fox glove

Name: dioxin, digitek, lanoxin

Question 2

Digoxin 3 main functions

Answer 2

+inotropic action
-Chronotropic action
-Dromotropic action

Question 3

+inotropic action
Digoxin

Answer 3

Primary indication for med

Increases myocardial contration

Increases CO

Decreases oxygen use by making each contraction become more efficient

Question 4

• Chronotropic action
  Digoxin

Answer 4

Decrease HR

Mainly why the O2 compensation is decreased

Question 5

-Dromotropic action
Digoxin

Answer 5

Decreased conduction from SA node to AV node

Question 6

Main indications for cardiac glycosides

Answer 6

CHF (main indication):
-Slows the heart down which decreases O2 consumption
-Increases the force of each contraction

A-fib:
Slow conduction thru SA and AV nodes

Question 7

Cardiac Glycosides
Nursing management

Answer 7

Dysrhythmias:
Bradycardia

Progression of AV-block

Electrolyte imbalances:
Hypokalemia may lead to digitalis toxicity
**both fight for same receptors

Question 8

Digoxin toxicity s/s
Early toxic s/s

Answer 8

Green/yellow vision
Double vision
Seeing spots or halos
HA
Dizziness
Fatigue
Weakness

Question 9

Digitalis toxicity
Tx

Answer 9

Hold next dose and wait until 1/2 life is reached then:
d/c or lower does

Atropine is first line DOC to tx symptomatic bradycardia

Antidote DIGIBIND is utilized
*hypokalemia is reversed first, dysrhythmias, reversal of +inotropic may take several hours

Question 10

Other meds

Answer 10

Inamirinone
Milrinone

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