A Study to Evaluate the Performance and Potential Benefits of an Assistive Artificial Intelligence Device ScanNav Anatomy Peripheral Nerve Block - US V1.0 for Ultrasound-guided Regional Anesthesia

Background:

The American Society of Regional Anesthesia and Pain Medicine (ASRA) has published evidence-based assessment of ultrasound-guided regional anesthesia (Neal et al., 2010) concluding that ultrasound guidance is superior or equal to other non-ultrasound nerve localization techniques. A subsequent publication from ASRA (Neal et al., 2016), has strengthened their position of ultrasound guidance being superior than other methods, including for the reduction of local anesthetic systemic toxicity. However, ultrasound-guided regional anesthesia (UGRA) is a difficult technique to master. A key activity of UGRA is ultrasound image interpretation (Sites et al., 2009) which ScanNav Anatomy PNB is designed to support.

Methodology:

15 participants (anesthesiologists capable of independently performing UGRA) will be recruited to evaluate the performance and benefit of ScanNav Anatomy PNB device in person, by scanning 2 healthy models (n=1 BMI<30, n=1 BMI>=30 kg/m2).

The device performance and benefits will be ascertained once the scanning session for each block is complete by use of a structured questionnaire.

• Participants will be asked to scan a model with and without the use of ScanNav Anatomy PNB. The order of with/without the device will be randomized between participants.
• Participants will also be asked to supervise a trainee (another healthcare professional qualified to perform the UGRA procedure under supervision) while they are scanning models with and without ScanNav Anatomy PNB aid. The participant will always use the device first before supervising the trainee.
• The above will be performed on 2 models from different BMI categories (n=1 BMI<30, n=1 BMI>=30 kg/m2; total scans n=16).
• The order of models will be randomized between participants.
• All 9 supported regions will be evaluated; each region will be scanned/evaluated at least 3 times.

Data collection

- Participants and trainees will be asked to complete a structured questionnaire to assess the device performance and clinical benefits at the end of scanning for the block.

Data analysis:

• Data will be aggregated and evaluated on safety critical structure type basis.
• Quantitative data obtained from the participants will be presented as frequencies and expressed as percent of total or as mean ± s.d. where appropriate.

The collected data and overall performance and benefits of ScanNav Anatomy PNB will be evaluated and summarized by presence and absence of ScanNav Anatomy PNB assistance, trainee and stratified by low/high BMI model.

Independent expert evaluation

• The scans be recorded during the study sessions. These scans will be post processed to short clips (10 seconds prior to obtaining optimum view) and sent for evaluation to an independent expert panel.
• The expert panel will be asked to evaluate the scans and the ScanNav Anatomy PNB highlighting performance independently from the participant. The majority opinion (at least 2/3) will be obtained to establish the agreement (e.g., yes/yes/no = yes)
• The answers obtained during the scan session from participants will be compared to expert panel view. Independent comparisons between performance assessment will be made, providing that the expert panel view is the 'ground truth'.
• Data will be evaluated and presented by safety structure on each model and overall (i.e., total for each class of safety critical structure; nerve, artery etc.).