A nurse is assessing a patient who has been on mechanical ventilation for five days for pneumonia. The underlying pneumonia is resolving. Which of the following findings indicates the patient is ready for a spontaneous breathing trial (SBT)?

Appeared in: HPSSC - 2015

Explanation

This option presents a patient who meets all the standard criteria for initiating a spontaneous breathing trial (SBT).
The FiO2 (40%) and PEEP (5 cmH2O) levels indicate that the patient's oxygenation has significantly improved and they require minimal ventilator support.
The patient is awake and alert, which is essential for assessing their ability to maintain a patent airway and cooperate with the weaning process.
Hemodynamic stability is a prerequisite for an SBT, ensuring the patient can tolerate the increased work of breathing without cardiovascular compromise.

Option A: The FiO2 (60%) and PEEP (10 cmH2O) are too high, indicating the patient still requires significant respiratory support. Furthermore, a sedated patient cannot participate in an SBT or protect their own airway.
Option C: A systolic blood pressure of 85 mmHg indicates hemodynamic instability (hypotension), which is a contraindication for an SBT. A drowsy mental status also increases the risk of airway compromise.
Option D: Copious secretions and a weak cough are major contraindications for weaning and extubation. The patient must be able to effectively clear their own airway to prevent post-extubation complications like aspiration or mucus plugging.

Clinical Relevance

Nursing practice connection: Use the key finding related to Criteria for readiness for a spontaneous breathing trial (SBT) and weaning from mechanical ventilation to guide bedside assessment, documentation, and the next nursing action.
Nurses play a vital role in the weaning process by performing daily assessments of SBT readiness, often using a standardized protocol or checklist.
During an SBT, the nurse must closely monitor the patient for signs of intolerance, such as tachypnea (respiratory rate greater than 35/min), hypoxia (SaO2 less than 90%), tachycardia, hypotension/hypertension, or anxiety. The trial must be stopped immediately if these occur.
Patient safety is paramount. Prematurely starting an SBT on a patient who is not ready can lead to respiratory muscle fatigue, cardiovascular instability, and a setback in the weaning process.

How to Approach the Question

First, identify the core question: What are the signs that a patient is ready to be weaned from a ventilator?
Recall or look for the standard criteria for a Spontaneous Breathing Trial (SBT). Think of it as a checklist: Is the original problem getting better? Is oxygenation stable on low support? Is the patient hemodynamically stable? Is the patient awake? Can they protect their airway?
Evaluate each option against this mental checklist.
Option A fails on oxygenation support (too high) and mental status (sedated).
Option C fails on hemodynamic stability (hypotension) and mental status (drowsy).
Option D fails on airway protection (copious secretions, weak cough).

Concept Tested & Keywords

Concept Tested: Criteria for readiness for a spontaneous breathing trial (SBT) and weaning from mechanical ventilation.
Stem keywords: mechanical ventilation, pneumonia, spontaneous breathing trial, SBT, weaning
Lead-in keywords: indicates, ready for
Clinical cues: Patient on mechanical ventilation for five days
Clinical cues: Underlying pneumonia is resolving

QJhITH64fHeNKg0dCqwRxA

E6 Medicine Harrison 22e Part 2 pp. 212-214, 200-202

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 674-676

Practise the full HPSSC - 2015

Attempt every question from this paper in a timed mock, then review the full solution for each one.