Mechanical Ventilation — Alarms & Complications
The ventilator is alarming. You have seconds to decide: is the problem the machine, the circuit, or the patient? Choosing wrong costs airway time.
Core Concept
Ventilator alarms divide into two pressure categories that point you in opposite directions. A high-pressure alarm means something is resisting airflow: the client is biting the tube, mucus is plugging the airway, the tubing is kinked, bronchospasm has narrowed the airways, or the client is coughing or fighting the vent. Nursing response moves from simple to complex — check tubing for kinks, suction the airway, reposition the client, and if unresolved, notify the provider. A low-pressure alarm means air is escaping or not arriving: a circuit disconnection, a loose connection, a cuff leak on the endotracheal or tracheostomy tube, or accidental extubation. This is the more immediately dangerous alarm because the client may not be receiving breaths at all. First action: check all connections and the client. If the client is extubated, manually ventilate with a bag-valve-mask while calling for help. High-volume alarms (high tidal volume or high minute ventilation) often signal anxiety, pain, or tachypnea. Low-volume alarms suggest apnea or shallow breathing. Always assess the client first, then the equipment — the NCLEX consistently rewards patient-first reasoning.
Watch Out For
High-pressure alarm = obstruction (something blocking outflow) versus low-pressure alarm = disconnection (air escaping before reaching the client) — students frequently reverse these. Don't confuse alarm troubleshooting with ventilator setup (mode, FiO2, PEEP settings) — setup lives in the sibling atom. A low-pressure alarm from a cuff leak is not the same as accidental extubation, though both drop pressure; cuff leaks present with an audible air leak around the tube and a voice or gurgling sound.
Clinical Pearl
High pressure = something's blocked, grab the suction. Low pressure = something's loose, grab the bag-valve-mask. Block versus leak — that's your fork in the road.
Test Your Knowledge
3 quick questions — see how well you understood Mechanical Ventilation — Alarms & Complications