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Zorluk: ZorPharmacological Therapies

A practical nurse is caring for a client with congestive heart failure who is scheduled to receive a morning dose of oral digoxin. The client's morning laboratory results show a serum potassium level of 3.0 mEq/L3.0\text{ mEq/L} (3.0 mmol/L3.0\text{ mmol/L}) and a serum digoxin level of 1.4 ng/mL1.4\text{ ng/mL} (1.8 nmol/L1.8\text{ nmol/L}). The client's apical pulse is 64 beats/min64\text{ beats/min}. During the morning assessment, the client reports new-onset severe nausea and seeing yellow halos around the lights in the room. Which action should the practical nurse take first?

  1. A
    Administer the digoxin as prescribed because the apical pulse is greater than 60 beats/min60\text{ beats/min} and the serum drug level is within the therapeutic range.
  2. B
    Convert the oral digoxin prescription to an intravenous push dose to bypass the gastrointestinal tract and prevent vomiting.
  3. Withhold the digoxin dose and immediately report the client's symptoms and laboratory values to the supervising registered nurse.Cevap
  4. D
    Bypass barcode scanning and use the client's room number to quickly administer the medication before the nausea worsens.

Cevap

The practical nurse must withhold the digoxin dose and immediately report the client's symptoms and laboratory values to the supervising registered nurse.
The correct action is to withhold the dose and notify the RN. The client's potassium level of 3.0 mEq/L3.0\text{ mEq/L} indicates hypokalemia. Low potassium increases the heart's sensitivity to digoxin, significantly elevating the risk of toxicity even when the serum digoxin level (1.4 ng/mL1.4\text{ ng/mL}) falls within the normal therapeutic range (0.5−2.0 ng/mL0.5-2.0\text{ ng/mL}). Furthermore, the client's nausea and visual disturbances (yellow halos) are classic clinical indicators of digoxin toxicity. The practical nurse must hold the medication and escalate these critical findings.

Adım Adım Çözüm

1
Evaluate the client's laboratory results against normal reference ranges.
The serum potassium level is critically low (3.0 mEq/L3.0\text{ mEq/L}, normal is 3.5−5.0 mEq/L3.5-5.0\text{ mEq/L}), while the digoxin level is within the standard therapeutic range (0.5−2.0 ng/mL0.5-2.0\text{ ng/mL}).
Identifying abnormal laboratory values is essential before administering cardiovascular medications.
2
Correlate the client's physical symptoms and laboratory results with the prescribed medication.
Hypokalemia increases the myocardium's sensitivity to digoxin, leading to toxicity even at normal serum drug levels. Nausea and visual disturbances (yellow halos) are classic signs of digoxin toxicity.
Clinical presentation takes precedence over 'normal' therapeutic drug levels when predisposing factors like hypokalemia are present.
3
Determine the appropriate intervention within the practical nurse's scope of practice.
The nurse must withhold the medication to prevent further toxicity and immediately escalate the critical findings to the RN or provider.
Ensuring client safety by withholding a harmful medication and reporting to the RN aligns with the practical nursing scope of practice.

Anahtar Kavram

Digoxin Toxicity and Hypokalemia
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