A 45-year-old patient with newly diagnosed pulmonary tuberculosis is starting anti-tuberculosis therapy. Which nursing intervention is the highest priority during the initial phase of treatment?
1Monitor for signs of hepatotoxicity and educate about medication adherence✓ 정답
2Implement strict contact isolation precautions for 6 months
3Encourage increased fluid intake to prevent kidney stones
4Schedule monthly chest X-rays to monitor treatment progress
해설
During initial TB therapy, monitoring for hepatotoxicity is the highest priority due to the risk of liver damage from first-line drugs. Other options are less critical: isolation is not needed for 6 months, kidney stones are not a primary concern, and monthly chest X-rays are not the highest priority.
Priority Nursing Intervention During Initial Phase of Anti-Tuberculosis Therapy
The correct answer is monitoring for signs of hepatotoxicity and educating about medication adherence. This intervention is the highest priority because drug-induced hepatotoxicity is the most significant and potentially life-threatening adverse event associated with first-line anti-tuberculosis drugs, and it frequently compromises treatment adherence during the critical initial phase.
Understanding the Clinical Priority
The initial phase of tuberculosis treatment involves a combination of first-line agents, most commonly isoniazid, rifampicin, pyrazinamide, and ethambutol. While these drugs are essential for achieving a microbiological cure, their administration carries a substantial risk of adverse drug reactions. The foundational review by He et al. identifies hepatotoxicity as a primary toxicity, mediated by oxidative stress and mitochondrial dysfunction, stemming mainly from isoniazid and rifampicin . This is not a minor or delayed complication; it can develop rapidly after treatment initiation, making vigilant assessment during the initial phase a nursing imperative.
The clinical significance of this monitoring is further reinforced by Ma'aruf et al., who highlight that adverse events like hepatotoxicity in drug-susceptible TB regimens directly compromise patient adherence and treatment outcomes . For a nurse, the dual role of monitoring and educating is critical. Detecting early signs such as jaundice, right upper quadrant pain, nausea, or unexplained fatigue allows for prompt intervention, which may prevent progression to severe liver injury. Simultaneously, educating the patient about these signs and the absolute necessity of adhering to the prescribed regimen—despite potential side effects—directly addresses the most common reason for treatment failure.
Rationale for Biochemical Surveillance
The priority of this nursing intervention is supported by evidence demonstrating the value of structured, periodic liver function monitoring. A study by Dana et al. specifically evaluated the importance of biochemical monitoring of liver function, performing tests on patients at baseline and periodically throughout the treatment course at 10 days, 3 months, and 6 months . This protocol underscores that the risk of hepatotoxicity is not static; it requires ongoing assessment, beginning in the initial phase. The study tracked predictive biomarkers including aspartate aminotransferase (AST), alanine aminotransferase (ALT), alkaline phosphatase (ALP), and total bilirubin, all of which are standard components of a hepatic function panel . A nurse’s responsibility is to ensure that baseline levels are drawn before therapy begins and that follow-up labs are obtained as ordered, while correlating laboratory findings with the patient’s physical assessment.
Why Other Options Are Less Appropriate
- Option 2 (Implement strict contact isolation precautions for 6 months): This is not the highest priority. While airborne precautions are essential for patients with pulmonary TB, the duration is not a fixed 6-month period. Isolation is discontinued based on clinical criteria, including effective treatment for 2-3 weeks, clinical improvement, and three consecutive negative sputum smears. The initial nursing priority is managing the immediate, life-threatening risks of the medication itself.
- Option 3 (Encourage increased fluid intake to prevent kidney stones): This intervention is not a primary concern with standard first-line therapy. While hyperuricemia can occur as a side effect of pyrazinamide, routine encouragement of high fluid intake to prevent kidney stones is not a standard, high-priority nursing action for all patients starting TB treatment.
- Option 4 (Schedule monthly chest X-rays to monitor treatment progress): Radiographic monitoring is a tool for tracking disease response, but it is not the highest nursing priority during the initial phase. Treatment response is primarily monitored through sputum culture conversion. The immediate threat to the patient’s safety from hepatotoxic medications takes precedence over scheduling follow-up imaging.
Clinical Practice Guide
Monitoring for Hepatotoxicity
Obtain baseline liver function tests (ALT, AST, bilirubin) before initiating therapy.
Monitor liver enzymes monthly during the intensive phase, or more frequently if baseline abnormalities exist.
Educate the patient to immediately report symptoms such as nausea, vomiting, abdominal pain, jaundice, or dark urine.
If ALT exceeds 3 times the upper limit of normal with symptoms, or 5 times without symptoms, hold hepatotoxic drugs (typically INH, RIF, PZA) and consult the prescriber.
Ensuring Medication Adherence
Implement directly observed therapy (DOT) as the standard of care for all patients during the intensive phase.
Assess for barriers to adherence, including substance use, housing instability, and mental health conditions.
Provide a structured education plan covering drug names, dosing schedule, duration of therapy, and the consequences of missed doses.
Utilize adherence aids such as pillboxes, mobile reminders, and case management support.
Infection Control Considerations
Place the patient in a negative-pressure airborne infection isolation room (AIIR) upon admission.
Discontinue airborne precautions only when the patient has three consecutive negative acid-fast bacillus (AFB) sputum smears, shows clinical improvement, and has been on effective therapy for at least 2 weeks.
Instruct the patient to wear a surgical mask when leaving the room and to cover the mouth and nose when coughing.
Patient Education Points
Explain that rifampin will cause orange discoloration of urine, sweat, and tears; this is harmless but can permanently stain contact lenses.
Advise avoiding alcohol due to the additive risk of hepatotoxicity with isoniazid and pyrazinamide.
Report any visual changes immediately, as ethambutol can cause optic neuritis with decreased acuity or red-green color blindness.
Anti-tuberculosis drug-induced hepatotoxicity (ATLI) — Liver injury caused by first-line anti-TB medications, primarily isoniazid and rifampicin, presenting with elevated liver enzymes and requiring close monitoring during the initial treatment phase.
Intensive phase — The initial 2-month period of TB treatment using a four-drug regimen (isoniazid, rifampicin, pyrazinamide, ethambutol) aimed at rapidly killing bacilli.
Medication adherence — The extent to which a patient correctly follows the prescribed drug regimen, critical in TB to prevent treatment failure and drug resistance.