The patient on neuromuscular blockers: sedation first, train-of-four, eye care and skin
- Safe practice
A paralysed patient cannot move, blink or show pain: the nurse keeps them deeply sedated, monitors the block and protects eyes and skin.
What it is
Neuromuscular blockers paralyse skeletal muscle. In the ICU they are used for intubation and sometimes for severe ARDS, raised intracranial pressure, prone positioning, transfers or shivering, when other measures are not enough. They give no sedation and no analgesia, so a paralysed patient who is not deeply sedated can be awake, in pain and unable to show it. The patient depends entirely on the ventilator. Nursing care has four parts: make sure analgesia and sedation are adequate before and during the block, monitor the depth of block with a peripheral nerve stimulator and clinical signs, prevent the harms of paralysis (eyes, skin, accidental extubation) and watch recovery when the drug is stopped.
What it requires
- Train-of-four (TOF) delivers four stimuli half a second apart, for example over the ulnar nerve, and the nurse counts the muscle responses; the target is set in the order.
- Oedema and ICU-acquired weakness can make TOF readings inaccurate: it is always read together with the clinical picture.
- Magnesium, aminoglycosides, diuretics, beta-blockers and calcium channel blockers can strengthen the block.
- Acidosis and kidney or liver failure can prolong the block; recovery is monitored after the infusion stops.
- Reversal agents (neostigmine with glycopyrrolate; sugammadex for some agents) are given only on order.
Components
- Sedation scale and a plan for analgesia and sedation before the block.
- Peripheral nerve stimulator and electrodes.
- Eye lubricant and lid-closure material (film or moisture chamber) as the unit uses.
- Ventilator alarms set and audible; a manual resuscitation bag at the bedside.
How it is applied (and why)
- Confirm that analgesia and sedation are running at the ordered level before the blocker starts: the block hides pain and awareness.
- Check the train-of-four before the first dose if possible and then at the set times: it shows the baseline and guides the rate.
- Place the electrodes over the same nerve each time and note any oedema: it makes the reading less accurate.
- Watch heart rate, blood pressure and sweating: in a paralysed patient they may be the only signs of pain or awareness.
- Keep the ventilator alarms on and the tube and lines well secured: the patient cannot breathe or move if something disconnects.
- Lubricate the eyes and keep the lids closed on schedule: without blinking the cornea dries and ulcerates.
- Protect pressure points and reposition as the protocol sets (see basic care of the ICU patient): the patient cannot shift weight.
- Ask each day with the team whether the block is still needed, and monitor recovery after it stops: prolonged use is linked to weakness.
In nursing practice
- A sedation scale cannot be used during full paralysis: the team relies on the planned sedation level and physiological signs.
- Loss of cough and swallowing raises the risk of aspiration and atelectasis; suction and oral care follow the airway protocol.
- After stopping, weakness can persist or return; watch breathing effort, swallowing and strength before any change in support.
- Paralysis does not stop enteral feeding by itself (see ICU nutrition).
Common mistakes
- Starting or continuing the blocker without confirming that sedation and analgesia are adequate.
- Reading the train-of-four in oedematous limbs and trusting the number alone.
- Forgetting eye care: corneal abrasion and keratitis are preventable.
- Silencing ventilator alarms or leaving the bedside without a bag and suction ready.
Test yourself
Think of the answer, then tap the question to see it.
Why must sedation be adequate before a neuromuscular blocker starts?
The blocker paralyses but gives no sedation or analgesia; without enough sedation the patient can be awake and in pain and unable to show it.
What does the train-of-four measure?
The depth of neuromuscular block: four stimuli to a nerve; fewer twitches, or fading ones, mean a deeper block.
Why do paralysed patients need scheduled eye care?
They cannot blink or close the lids, so the cornea dries; lubrication and lid closure prevent abrasion and exposure keratitis.
Which signs may suggest awareness in a paralysed patient?
Non-specific signs such as fast heart rate, high blood pressure and sweating.
Connections
In Pharmacology2
Educational content for students; it does not replace your institution's protocols, supervised clinical training or a prescriber's order. Dose-calculation examples use made-up numbers: they are educational, not a clinical order.
Sources: Neuromuscular blocking drugs in the critically ill (Welhengama C, Hall A, Hunter JM) (BJA Education, PubMed Central, 2021); Considerations in Neuromuscular Blockade in the ICU: A Case Report and Review of the Literature (Workum JD, Janssen SHV, Touw HRW) (Case Reports in Critical Care, PubMed Central, 2020); Ocular Surface Disorders in ICU Patients: Evidence-Based Nursing Prevention Strategies (Ni W, Jiao X) (Translational Vision Science & Technology, PubMed Central, 2025).
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Representative model, for educational purposes only.