spectrum comparison
Digoxin Lifecycle: Therapeutic Use → Toxicity Recognition → Toxicity Management
Digoxin has one of the narrowest therapeutic windows you'll encounter — the margin between "working" and "killing" is razor-thin. The NCLEX expects you to trace the full arc: appropriate administration, the moment you hold the dose, the moment you recognize toxicity, and the moment you escalate to Digibind. Miss any transition point and you've picked the wrong answer.
Comparison
Progression3 stages
Progression — 3 stages
Therapeutic Use
What's happening- ↑ contractility, ↓ heart rate (HF, AFib)
Key findings- Therapeutic level 0.5–2.0 ng/mL
- Apical pulse 60–100; improved HF symptoms
Nursing focus- ★Hold & assess if apical pulse < 60
- Check K⁺ — low K⁺ precipitates toxicity
Toxicity Recognition
What's happening- Narrow window exceeded — toxic effects begin
Key findings- Anorexia, nausea, vomiting — earliest signs
- ★Yellow-green halos / blurred vision
- Bradycardia, dysrhythmias
Nursing focus- Hold dose; report N/V, halos, slow pulse
- Draw digoxin level & potassium
Escalate when- Level rising or new dysrhythmia → hold & call
Toxicity Management
What's happening- Reverse toxicity, stabilize rhythm & K⁺
Key findings- Hypokalemia & hypercalcemia worsen toxicity
- Level > 2.0 ng/mL; rises with renal decline
Nursing focus- ★Digoxin immune Fab (DigiFab) antidote
- Correct potassium; continuous ECG
Escalate when- Life-threatening dysrhythmia or ↑K⁺ → give Fab
★ marks the fact that sets a column apart.
Clinical Pearl
Hold at HR < 60, suspect at halos and nausea, Digibind at dysrhythmias — that's the whole spectrum.
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