Effect of Single-Prong Cannula Design With High Velocity Therapy: Comparable Efficacy at Lower Gas Flow Rates

Area of Science:

• Respiratory Medicine
• Critical Care Medicine
• Medical Device Technology

Background:

• High-velocity therapy (HVT) using nasal cannulas is common in acute care for dyspnea relief.
• Newer cannula designs aim to improve patient comfort and treatment efficacy.

Purpose of the Study:

• To compare the comfort and effectiveness of a new dual-prong (newDP) cannula and a single-prong (SP) cannula against a traditional HVT cannula in COPD patients.
• To evaluate dyspnea relief, vital signs, and gas exchange parameters.

Main Methods:

• A randomized crossover trial involving 26 patients with hypercapnic COPD experiencing dyspnea.
• Patients received HVT with traditional, newDP, and SP cannulas, with flow rates titrated for optimal efficacy.
• Outcomes measured included Rated Perceived Dyspnea (RPD) scores, vital signs, and transcutaneous carbon dioxide partial pressure (PTCco2).

Main Results:

• The SP cannula achieved comparable dyspnea relief to traditional and newDP cannulas but at significantly lower flow rates (p < 0.0001).
• Median flow rates for traditional, newDP, and SP cannulas were 25 L/min, 25 L/min, and 15 L/min, respectively.
• RPD scores improved similarly across all cannula types, with significant differences noted for newDP and SP compared to traditional (p = 0.044 and p = 0.01).

Conclusions:

• Both new dual-prong and single-prong cannula designs provide comparable relief of dyspnea in COPD patients undergoing HVT.
• The single-prong cannula demonstrates comparable efficacy at significantly reduced flow rates, suggesting potential for improved patient tolerance and resource utilization.
• Further investigation into the clinical utility of single-prong cannulas with HVT is warranted.