Reference — Mechanical Ventilation
Ventilator Alarm Troubleshooting
The common ventilator alarms, their likely causes, and the first actions to take — plus a fixed order of assessment that keeps the patient safe while you find the problem.
Written by Apex Respiratory Editorial Team
Educational use only. This material supports respiratory therapy education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional protocols, or physician orders. Always follow facility policies and current provider orders, and verify calculations independently before clinical use.
Overview
An alarm is information, not an emergency by itself — but it always demands a look at the patient before the machine. The matrix below pairs each alarm with the causes that produce it most often and the first actions that address them. Work the airway and circuit from the patient outward, and never silence an alarm you cannot explain.
Common Alarms
| Alarm | Likely Causes | First Actions |
|---|---|---|
| High pressure |
|
|
| Low pressure / low V̇E |
|
|
| High respiratory rate |
|
|
| Low respiratory rate / apnea |
|
|
| High V̇E |
|
|
RT Priorities — A Safe Approach
- Assess in order: patient → circuit → ventilator. Look, listen, and check the chest before chasing the waveform.
- When in doubt, disconnect and bag. Manually ventilate with 100% O₂ via a resuscitation bag; if the patient is easy to bag, the problem is the ventilator or circuit, not the patient.
- Never silence an alarm without a cause. Silencing buys seconds to act, not a reason to stop looking.
- For sudden deterioration, run DOPE: Displacement of the tube, Obstruction (secretions or kink), Pneumothorax, and Equipment failure.
Related Resources
Sources
- Kacmarek RM, Stoller JK, Heuer AJ. Egan's Fundamentals of Respiratory Care. 12th ed. Elsevier; 2021. Patient-ventilator interactions and monitoring chapters.
- Hess DR, Kacmarek RM. Essentials of Mechanical Ventilation. 4th ed. McGraw-Hill Education; 2019.