First characterization of the expiratory flow increase technique: method development and results analysis

Area of Science:

• Pediatrics
• Physiotherapy
• Biomedical Engineering

Background:

• The expiratory flow increase technique (EFIT) is crucial for infant respiratory management.
• Objective assessment methods for manual EFIT in infants are lacking.
• Physiotherapists rely on tactile feedback, necessitating objective quantification.

Purpose of the Study:

• To develop and validate a novel system for objectively measuring manual EFIT in infants.
• To quantify key parameters of the EFIT maneuver as performed by physiotherapists.
• To establish a basis for standardizing EFIT protocols.

Main Methods:

• Customized instrumented gloves with pressure and displacement sensors were designed and utilized.
• Data collection involved infants with bronchiolitis undergoing EFIT by an expert physiotherapist.
• Analysis focused on quantifying displacement, hand movement direction, applied pressure, and thrust duration.

Main Results:

• The system successfully collected quantitative data consistent with physiotherapist tactile feedback.
• Displacement magnitudes were under 10 mm; thoracic hand movement was more vertical.
• Thoracic hand pressure was approximately double the abdominal hand pressure; thrust duration was (590 ± 62) ms.

Conclusions:

• The developed instrumented glove system provides objective, repeatable data for manual EFIT in infants.
• Quantitative parameters of the EFIT maneuver have been defined.
• Further inter-operator studies are needed to generalize findings and support standardization.