Nursing care
Mechanical Ventilation: the nurse's role, start to finish
Written and reviewed by Dana Whitfield, RN, MSN · 5 min read · Updated September 2026
Short answer
Mechanical ventilation supports or replaces spontaneous breathing when a patient cannot maintain adequate oxygenation or ventilation independently. Nursing management centres on airway patency, alarm recognition, sedation and pain control, and preventing ventilator-associated complications. The two most urgent alarms point in opposite directions: a high-pressure alarm signals obstruction, a low-pressure alarm signals disconnection or a leak.
When it is done and why
Mechanical ventilation is initiated for acute respiratory failure from any cause — worsening ARDS, severe pneumonia, COPD exacerbation with rising carbon dioxide, neuromuscular weakness affecting the diaphragm, or reduced consciousness that no longer protects the airway. It is also used electively during and after major surgery under general anaesthesia, and for airway protection in trauma or overdose where the patient cannot maintain a patent airway independently.
The decision rests on a combination of clinical signs and objective data: rising respiratory rate and accessory muscle use, falling oxygen saturation despite supplemental oxygen, deteriorating arterial blood gases showing hypoxaemia or hypercapnia with acidosis, and a falling level of consciousness. It buys time for the underlying condition to resolve or be treated; it does not fix the underlying pathology itself.
Preparing the patient
In a planned intubation, explain the procedure to the patient and family if time allows, gather airway equipment, suction, and emergency drugs, and confirm working intravenous access for induction and sedation medications. Position the patient supine with the head extended in sniffing position unless contraindicated by cervical spine injury, and pre-oxygenate with a bag-valve-mask or high-flow oxygen for several minutes before the attempt.
Have capnography and pulse oximetry attached and functioning before the first attempt, since end-tidal carbon dioxide confirms correct tube placement more reliably than auscultation alone. In an emergency intubation there is rarely time for full explanation, so focus on rapid equipment readiness, correct positioning, and having a plan for a failed first attempt, including a backup airway device at the bedside.
The steps that matter for safety
Confirm endotracheal tube placement immediately after intubation with continuous waveform capnography, bilateral breath sounds, and absence of sounds over the epigastrium, then secure the tube and document the depth at the lip or teeth so any subsequent movement is caught early. A chest X-ray confirms final position but should never delay initial clinical confirmation.
Set and verify ventilator alarms before leaving the bedside, and know that they point to opposite problems. A high-pressure alarm means something is obstructing the circuit or the airway — secretions, biting on the tube, a kinked line, bronchospasm, or a pneumothorax — and the patient is still connected but struggling to get air in. A low-pressure alarm means the circuit has lost its seal — a disconnection, a cuff leak, or an extubation — and the patient may not be receiving any breath at all. Responding to the wrong alarm as though it were the other wastes the minute that matters most.
During the procedure — the nurse's role
Once ventilated, monitor respiratory rate, tidal volume, peak and plateau pressures, and synchrony between the patient's own effort and the ventilator's delivered breaths; fighting the ventilator is a sign that something needs adjusting, whether sedation, mode, or an underlying complication. Suction only when indicated by secretions, coughing, or desaturation, not on a fixed schedule, since unnecessary suctioning causes trauma and hypoxaemia.
Maintain the head of bed at 30 to 45 degrees to reduce aspiration risk and the incidence of ventilator-associated pneumonia, provide regular oral care, and assess sedation depth against a validated scale so the patient is comfortable without being needlessly deep. Reassess the tube's securement and depth at every shift and after any repositioning, since a tube that has migrated can extubate the patient or slip into the right main bronchus without warning.
After: monitoring and complications
Watch for ventilator-associated pneumonia, barotrauma including pneumothorax from high airway pressures, and haemodynamic compromise from positive intrathoracic pressure reducing venous return and cardiac output, particularly in a volume-depleted patient. Arterial blood gases guide ventilator adjustments; correlate trends with clinical status rather than reacting to a single number in isolation.
During weaning, monitor for signs of intolerance — tachypnoea, rising heart rate, desaturation, accessory muscle use, or agitation — and have a plan to return to full support if the patient fails a spontaneous breathing trial. After extubation, monitor closely for stridor, increasing work of breathing, and the need for reintubation, and keep airway equipment at the bedside until the patient has demonstrated a stable airway for a reasonable period.
Documentation and teaching
Document ventilator settings, alarm parameters, tube position and depth, sedation level, suctioning frequency and secretion characteristics, and the patient's response to any change, since this record is what the next clinician relies on to spot a trend rather than a single data point. Note every alarm event and the intervention taken, particularly any distinction between a high-pressure and low-pressure cause, since this shapes troubleshooting for the rest of the admission.
Teach family what the equipment does and why the patient cannot speak while intubated, and explain that sedation may make the patient appear unresponsive even while hearing is often preserved. As weaning progresses, involve the patient in understanding each step, since anxiety about the process itself can undermine a spontaneous breathing trial that is otherwise going well.
The next step on this is the same as on everything else here: answer questions and read the rationales. Our respiratory practice questions are the closest set to what this page covers.
Common questions
What is the first thing to check when a high-pressure alarm sounds?
Check for obstruction: kinked tubing, the patient biting the tube, secretions needing suction, or bronchospasm. A high-pressure alarm means the ventilator is meeting resistance trying to deliver the breath, so the airway and circuit are the first places to look.
What does a low-pressure alarm on a ventilator usually mean?
It usually means a loss of circuit integrity — a disconnection, a leaking or deflated cuff, or accidental extubation. Check the connections from the patient back to the machine immediately, since the patient may not be receiving any breath.
How is ventilator-associated pneumonia prevented?
Keep the head of bed elevated to 30 to 45 degrees, provide regular oral care, suction only as needed rather than on a schedule, and assess daily for sedation interruption and readiness to wean. These measures reduce aspiration and the duration of intubation, both of which drive VAP risk.
How do you know a patient is ready to be weaned off the ventilator?
Readiness is assessed through improving oxygenation on modest ventilator support, haemodynamic stability, adequate cough and secretion clearance, and an alert, cooperative patient able to protect the airway. A spontaneous breathing trial is then used to confirm tolerance before extubation.