What is the range for setting flow triggering?

• A. 0-2 L/min
• B. 3-8 L/min
• C. 1-10 L/min
• D. 5-15 L/min

Answer: (C)

Flow triggering relies on a small threshold in inspiratory flow that must be met (or a drop below baseline that must be detected) to start a breath. Because patient effort varies and circuit leaks or noise can cause unintended triggers, the trigger sensitivity is made adjustable over a broad range. Being able to set it from about 1 up to 10 L/min lets you be very sensitive to weak efforts (lower end) when the patient is struggling, or more conservative (higher end) to prevent auto-triggering from leaks or turbulence.

That’s why this range is the best answer: it reflects the typical adjustable span on modern ventilators, giving the clinician flexibility to tailor triggering to the individual patient and clinical scenario. In practice you’d start around 1–2 L/min for sensitivity and raise it if you see unwanted triggering, or lower it if breaths aren’t being triggered promptly.