Positive Inotropic Drugs

Drugs that influence th rate of the heartbeat

chronotropic drugs

drugs that influence the conduction of electrical impulses.

dromotropic drugs

the proportion of blood that is ejected during each ventricular contraction compared with the total ventricular filling volume.

Ejection fraction

An abnormal condition in which cardiac pumping is impaired as a result of myocardial infarction,ischemic heart disease, or cardiomyopathy

heart failure

drugs that influence the force or energy of muscular contractions.

inotropic drugs

a common cardiac dysrhythmia involving atrial contractions that are so rapid that they prevent full repolarization of myocardial fibers between heartbeats.

Atrial fibrillation

increase in the heart rate

positive chronotropic

enhance the conduction of electrical impulses in the heart

positive dromotropic

the toltal amount of blood in the ventricle immediately before it contracts, or the preload

left ventricular end-diastolic volume

this is the period during which the cardiac cell is readjusting its sodium and potassium levels and cannot be depolarized again

refractory period

65% of the total volume in the ventricle is:

ejection fraction

reduced heart rate

negative chronotropic

digoxin decreases automaticity at the SA node causing a:

negative dromotropic effect

if the apical pulse is less than 60 digoxin should be:

given

Promotion of ____ improves blood circulation

diuresis

digoxin _____ stroke volume

increases

used in the treatment of heart failure and supraventricular dysrhythmias

cardiac glycosides

diuresis through the kidney relieves:

SOB
pulmonary edema

most pronounced adverse effect of digoxin is:

green yellow visual halos

obstruction in the left ventricle below the aortic valve

subaortic stenosis

what needs to be monitored during digoxin therapy:

dig level
potassium level
apicial pulse

a potassium level that is 6.0 indicates:

digitoxicity

treatment of digitoxicity

discontinue digoxin administration
monitor v/s and labs
administer digoxin immune Fab

the antidote for digoxin is

digoxin immune Fab

loop diuretics and laxatives concurrently given with digoxin can:

increase digoxin
produce hypokalemia

low potassium in blood

hypokalemia

food contraindicated with digoxin is

bran

food that decreases the absorption of digoxin

bran

a loading dose of digoxin is

1 to 1.5

loading dose of digoxin is called

digitalizing

hypokalemia indicates

digoxin toxicity

digoxin level should be between:

0.5 to 2.0

Low potassium level indicates

digoxin toxicity

Potassium level should be between:

3.5 to 5.0