• Older age.
• Certain medical conditions such as kidney disease, hypothyroidism, or heart disease.
• Low blood levels of potassium or magnesium.
• High blood levels of potassium or calcium.
• Use of herbal supplements that contain substances similar to digoxin.

What are the most common adverse reactions for digoxin?

Nausea, vomiting, headache, dizziness, loss of appetite, and diarrhea may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

How do nurses assess for digoxin toxicity?

A nurse should assess the apical pulse for a full minute before administering digoxin due to its positive inotropic action (it increases contractility, stroke volume, and, thus, cardiac output), negative chronotropic action (it decreases heart rate), and negative dromotropic action (it decreases electrical conduction ...

What is digoxin toxicity level?

Therapeutic levels of digoxin are 0.8-2.0 ng/mL. The toxic level is >2.4 ng/mL.

How do you test for digoxin toxicity?

How is a digoxin test performed? Your doctor will check your levels of digoxin by testing a sample of your blood. They'll probably ask you to go to an outpatient clinical laboratory to give a blood sample. The healthcare provider at the lab will draw blood from your arm or hand with a needle.

Why does hyperkalemia cause digoxin toxicity?

Because digoxin binds to the K⁺ site of the Na⁺/K⁺-ATPase pump, low serum potassium levels increase the risk of digoxin toxicity. Conversely, hyperkalemia diminishes digoxin's effectiveness.

How does digoxin slow AV conduction?

AV Node Inhibition: Digoxin has vagomimetic effects on the AV node. By stimulating the parasympathetic nervous system, it slows electrical conduction in the atrioventricular node, therefore, decreases the heart rate.

How does digoxin increase vagal tone?

At therapeutic doses, digoxin increases vagal tone to the heart. The increase in vagal tone results from several different mechanisms including: sensitization of baroreceptors. central vagal stimulation.

Can hyperkalemia cause digoxin toxicity?

Hyperkalemia is the usual electrolyte abnormality precipitated by digoxin toxicity, primarily in the acute setting. Hyperkalemia may be associated with acute renal failure that subsequently precipitates digoxin toxicity.

Why thiazide and loop diuretics are contraindicated in patients on digitalis therapy?

Loss of potassium is the most common problem with the intake of thiazide diuretics. It is especially important in patients who are taking digitalis as it can predispose them to ventricular arrhythmias.

How does digoxin work in terms of altering movement of Na+ K+ and Ca ++ and how does that relate to the improvement in cardiac function?

Digoxin increases the force of contraction of the muscle of the heart by inhibiting the activity of an enzyme (ATPase) that controls movement of calcium, sodium, and potassium into heart muscle. Calcium controls the force of contraction.

How do you monitor digoxin levels?

After oral administration, there is an early rise in serum concentration. Equilibration of serum and tissue levels occurs at approximately 6 to 8 hours. For this reason, blood specimens for digoxin analysis should be drawn at least 6 to 8 hours after drug administration. Digoxin is excreted primarily in the urine.

What happens if digoxin levels are too high?

Digoxin toxicity can emerge during long-term therapy as well as after an overdose. It can occur even when the serum digoxin concentration is within the therapeutic range. Toxicity causes anorexia, nausea, vomiting and neurological symptoms. It can also trigger fatal arrhythmias.

What labs do you monitor with digoxin?

Digoxin is primarily cleared from the body by the kidneys. If you have kidney problems, your healthcare provider may want to monitor kidney function and blood potassium levels since kidney dysfunction and low levels of potassium can result in symptoms of digoxin toxicity.

What is antidote for digoxin toxicity?

In the case of severe digoxin intoxication, an antidote digoxin immune Fab (Digibind) is available. Digibind binds and inactivates digoxin.

What do you do if a patient has digoxin toxicity?

Therapeutic options range from simply discontinuing digoxin therapy for stable patients with chronic toxicity to digoxin Fab fragments, cardiac pacing, antiarrhythmic drugs, magnesium, and hemodialysis for severe acute toxicity.

What are nursing considerations for digoxin?

Monitor BP periodically in patients receiving IV digoxin. Monitor ECG during IV administration and 6 hr after each dose. Notify health care professional if bradycardia or new arrhythmias occur. Observe IV site for redness or infiltration; extravasation can lead to tissue irritation and sloughing.

What should be assessed before administering digoxin?

Check your pulse before you take your digoxin. If your pulse is under 60 beats per minute, wait 5 minutes. Then check your pulse again. If it's still under 60, call your healthcare provider.

What are the signs and symptoms of digoxin toxicity and how would the nurse assess for these symptoms?

Indications of toxicity include: Lack of appetite, nausea, vomiting, or diarrhea. Headache, confusion, anxiety, or hallucinations. Restlessness, weakness, or depression. Changes in vision such as blurred vision or seeing halos around bright objects.

Can digoxin cause memory loss?

The results strongly suggest that an increasing plasma level of digoxin may produce a progressive deterioration in auditory verbal learning and short-term memory.

Is digoxin contraindicated in hyperkalemia?

However, if the hyperkalemia is thought to be due to a cardiac glycoside, including digoxin, the primary treatment is simply the digoxin-specific antibodies. Traditionally, the administration of calcium to treat digoxin-induced hyperkalemia has been contraindicated. Newer data have called that into question.