Which device provides precise, fixed FiO2 suitable for titrating SpO2 to 88–92%?

Which device provides precise, fixed FiO2 suitable for titrating SpO2 to 88–92%?

• A. Nasal cannula
• B. Nonrebreather mask
• C. Simple face mask
• D. Venturi mask

Answer: (D)

Delivering a known, fixed oxygen concentration is essential when you want to carefully titrate SpO2 to a specific narrow range. The Venturi mask is built to provide a precise FiO2 through fixed diluters and color-coded adapters. Each adapter delivers a labeled oxygen concentration, so the amount of oxygen actually delivered remains consistent regardless of how hard or shallow the patient breathes. This steadiness is exactly what you need when aiming for a targeted SpO2 of about 88–92%, helping to avoid both hypoxia and the risk of CO2 retention in susceptible patients. In contrast, other devices don’t offer the same precision. A nasal cannula delivers oxygen with FiO2 that varies with the patient’s breathing pattern and flow rate, making exact titration difficult. A simple face mask also produces variable FiO2 depending on fit and breathing, so the delivered oxygen can drift. A nonrebreather mask can provide high concentrations but is not fixed; its effective FiO2 changes with inspiratory flow and mask seal, which makes tight control of SpO2 less reliable.

Delivering a known, fixed oxygen concentration is essential when you want to carefully titrate SpO2 to a specific narrow range. The Venturi mask is built to provide a precise FiO2 through fixed diluters and color-coded adapters. Each adapter delivers a labeled oxygen concentration, so the amount of oxygen actually delivered remains consistent regardless of how hard or shallow the patient breathes. This steadiness is exactly what you need when aiming for a targeted SpO2 of about 88–92%, helping to avoid both hypoxia and the risk of CO2 retention in susceptible patients.

In contrast, other devices don’t offer the same precision. A nasal cannula delivers oxygen with FiO2 that varies with the patient’s breathing pattern and flow rate, making exact titration difficult. A simple face mask also produces variable FiO2 depending on fit and breathing, so the delivered oxygen can drift. A nonrebreather mask can provide high concentrations but is not fixed; its effective FiO2 changes with inspiratory flow and mask seal, which makes tight control of SpO2 less reliable.