Recognising deterioration before it is obvious
The single most valuable respiratory skill on the NCLEX is catching hypoxia while it is still subtle. Test writers deliberately place the correct answer at the early stage, because that is what safe practice looks like. A client who becomes restless, anxious or mildly confused after surgery is showing cerebral hypoxia, and that is the client you assess first — ahead of the client with stable chronic findings.
Cyanosis, bradycardia and decreased level of consciousness are late signs of a client already in trouble. If they appear in a stem, the item usually shifts from assessment to intervention and escalation. A common distractor pattern offers 'continue to monitor' for a client who has already crossed into late signs; that option is nearly always wrong.
Learn the trajectory rather than isolated signs. Anxiety and restlessness, then tachypnoea and tachycardia, then use of accessory muscles and nasal flaring, then falling saturations, then cyanosis and bradycardia. Where the client sits on that trajectory tells you whether the answer is assess, intervene, or call for help immediately.
- •Restlessness and anxiety are the first signs of hypoxia in adults and children
- •Accessory muscle use, retractions and nasal flaring indicate increased work of breathing
- •Cyanosis, bradycardia and falling consciousness are late and demand escalation
- •'Continue to monitor' is rarely correct once late signs appear
Oxygen delivery devices at a glance
Device questions are straightforward once you match the required concentration to the device that provides it. Low-flow devices mix room air with delivered oxygen, so the actual concentration varies with the client's breathing pattern. High-flow and reservoir systems deliver more predictable concentrations.
For clients with chronic carbon dioxide retention, the exam expects careful, controlled oxygen delivery with close monitoring rather than a blanket high-flow response, and it expects you to monitor level of consciousness and respiratory rate rather than only the pulse oximeter. Never withhold oxygen from a hypoxic client, but titrate deliberately and reassess.
Safety teaching accompanies almost every home oxygen item: no smoking or open flames near the equipment, secure cylinders upright, avoid petroleum-based products around the face, and check skin behind the ears and around the nares for pressure damage.
| Device | Flow rate | Approximate FiO2 | Best used when |
|---|---|---|---|
| Nasal cannula | 1–6 L/min | 24–44% | Mild hypoxia, client needs to eat and talk |
| Simple face mask | 5–10 L/min | 40–60% | Moderate need, short-term use |
| Venturi mask | 4–12 L/min | 24–60% precise | Chronic lung disease needing exact concentration |
| Non-rebreather | 10–15 L/min | 60–90%+ | Severe hypoxia, keep reservoir bag inflated |
| Bag-valve mask | 15 L/min | Near 100% | Apnoea or inadequate spontaneous ventilation |
Positioning, suctioning and airway management
Positioning is the cheapest intervention and appears constantly as a correct answer. High Fowler's improves diaphragmatic excursion for dyspnoea and heart failure; the tripod position is what clients with COPD adopt naturally. For unilateral lung disease, the general teaching is good lung down to improve perfusion matching, while for a post-lobectomy or pneumonectomy client you follow the surgeon's specific instruction described in the stem.
Suctioning items reward technique detail. Pre-oxygenate, insert without suction applied, apply suction intermittently on withdrawal, limit each pass to ten to fifteen seconds, and allow recovery between passes. Complications to anticipate are hypoxia, bradycardia from vagal stimulation, mucosal trauma and bronchospasm. Suction based on assessment findings such as audible secretions or rising airway pressures, not on a fixed schedule.
Tracheostomy care items add their own priorities: keep an obturator and a spare tube of the same size at the bedside, secure new ties before removing old ones, and treat sudden respiratory distress with immediate assessment for obstruction or dislodgement. These are high-yield details that appear in fundamentals and adult health items alike.
- •High Fowler's or tripod for dyspnoea; good lung down for unilateral disease
- •Suction only on withdrawal, 10–15 seconds, after pre-oxygenation
- •Anticipate hypoxia and bradycardia during suctioning
- •Keep obturator and spare tracheostomy tube at the bedside
Turning respiratory knowledge into exam points
Respiratory content overlaps heavily with prioritisation, so practise it that way. Instead of answering isolated questions about a single client, work through four-client assignment items where one client has a respiratory issue and the others have stable chronic findings. That format is exactly how the NCLEX packages this content, and it forces you to compare rather than simply recognise.
Pair this material with arterial blood gases and with cardiac content, because oxygenation problems rarely stay confined to the lungs. A client with heart failure, a client with a pulmonary embolism and a client with COPD exacerbation all present with dyspnoea, but the correct action differs, and the stem detail that distinguishes them is usually the onset and the associated findings.
Work through a timed set of adult health questions weekly and review every rationale, including the ones you answered correctly. Confirming why the other three options were wrong is what converts recognition into reliable performance under pressure.