20 Feb J.F, a 47 year old male is being treated with digoxin for congestive heart failure
J.F, a 47 year old male is being treated with digoxin for congestive heart failure. Before administration of the next dose, the nurse notes an apical pulse of 55 beats per minute. J.F complains of nausea and vision changes.
J.F asks how digoxin can help his condition. How does the nurse respond? (USLO 5.2, 5.3, 5.4)
How does right- and left-sided heart failure present differently? (USLO 5.1)
Should the next dose of digoxin be administered? Why or why not? (USLO 5.3, 5.6, 5.8)
What are the complaints of J.F likely a result of and how is this rectified? (USLO 5.6, 5.8)
Case Context
Patient: J.F, 47-year-old male
Condition: Congestive Heart Failure (CHF)
Medication: Digoxin
Findings: Apical pulse 55 bpm, nausea, vision changes
1. How Digoxin Helps in CHF (USLO 5.2, 5.3, 5.4)
Mechanism of Action:
Digoxin is a cardiac glycoside.
It inhibits the sodium-potassium ATPase pump in myocardial cells.
This increases intracellular sodium, which indirectly increases intracellular calcium via the sodium-calcium exchange mechanism.
More calcium available → stronger myocardial contraction (positive inotropic effect).
Digoxin also slows conduction through the AV node (negative chronotropic effect), reducing heart rate.
Clinical Benefit in CHF:
Improves cardiac output by strengthening contractions.
Reduces symptoms such as fatigue, dyspnea, and exercise intolerance.
Helps control ventricular rate in atrial fibrillation.
Nurse’s Response to J.F:
“Digoxin helps your heart pump more effectively and slows your heart rate, which reduces the workload on your heart and improves circulation.”
2. Differences Between Right- and Left-Sided Heart Failure (USLO 5.1)
Right-Sided HF Left-Sided HF
Blood backs up into systemic circulation Blood backs up into pulmonary circulation
Symptoms: peripheral edema, ascites, hepatomegaly, jugular venous distension Symptoms: pulmonary congestion, dyspnea, orthopnea, paroxysmal nocturnal dyspnea
Weight gain due to fluid retention Cough, crackles, frothy sputum
Fatigue due to poor systemic perfusion Fatigue due to poor oxygenation
3. Should the Next Dose of Digoxin Be Administered? (USLO 5.3, 5.6, 5.8)
No, the next dose should be withheld.
Reasoning:
Apical pulse is 55 bpm, which is below the safe threshold (generally <60 bpm is a contraindication).
Patient is experiencing classic signs of digoxin toxicity (nausea, vision changes such as yellow/green halos).
Administering another dose could worsen bradycardia and toxicity.
Action:
Hold the dose.
Notify the healthcare provider immediately.
Assess digoxin serum levels and electrolytes (especially potassium).
4. Likely Cause of J.F’s Complaints & How to Rectify (USLO 5.6, 5.8)
Cause:
Complaints of nausea and vision changes are likely due to digoxin toxicity.
Toxicity risk increases with bradycardia, renal impairment, or electrolyte imbalances (especially hypokalemia).
Rectification:
Withhold digoxin.
Check serum digoxin levels (therapeutic range: 0.5–2.0 ng/mL).
Correct electrolyte imbalances (potassium supplementation if low).
In severe cases, administer digoxin immune Fab (Digibind) as an antidote.
Provide supportive care and monitor cardiac rhythm closely.
Summary
Digoxin improves cardiac output by increasing contractility and slowing heart rate.
Right-sided HF presents with systemic congestion (edema, ascites), while left-sided HF presents with pulmonary congestion (dyspnea, crackles).
The next dose of digoxin should not be administered due to bradycardia and signs of toxicity.
J.F’s complaints are likely due to digoxin toxicity, which requires withholding the drug, monitoring levels, correcting electrolytes, and possibly antidote therapy.
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