Intraoperative Lung Ultrasound Enhances Pulmonary Nodule Localization in Robotic Thoracic Surgery

Overview

Intraoperative lung ultrasound (ILU) demonstrates high feasibility and accuracy for localizing deeply situated pulmonary nodules during totally endoscopic robotic-assisted thoracic surgery (RATS). This technique achieves a 100% detection rate, reduces localization time, and avoids complications associated with preoperative invasive localization methods.

Background

Minimally invasive thoracic surgery, including video-assisted (VATS) and robotic-assisted thoracic surgery (RATS), is increasingly used for early-stage lung cancer and indeterminate pulmonary nodules due to benefits like reduced pain and faster recovery. However, RATS lacks tactile feedback, complicating localization of small or deep nodules. Traditional preoperative localization techniques are invasive and carry risks, prompting exploration of intraoperative lung ultrasound as a non-invasive, real-time alternative. Prior studies have shown ILU's effectiveness in VATS, but evidence in RATS remains limited.

Data Highlights

Key Findings

• ILU achieved a 100% detection rate for pulmonary nodules located more than 1 cm from the pleural surface during RATS.
• Localization time with ILU was significantly shorter compared to manual or instrumental palpation (9 vs. 14 minutes).
• ILU enabled accurate identification of sub-centimetric nodules and ground-glass opacities without the need for thoracotomy conversion.
• No intraoperative or postoperative complications related to ILU were observed.
• ILU serves as a reliable 'alternative finger' compensating for the lack of tactile feedback in robotic surgery.

Clinical Implications

ILU offers a safe, efficient, and non-invasive method for real-time localization of pulmonary nodules during robotic thoracic surgery, improving surgical precision and potentially reducing operative times. Its use may decrease reliance on preoperative invasive localization techniques, minimizing patient risk and resource utilization. Training surgical teams in ILU can enhance outcomes in minimally invasive thoracic procedures.

Conclusion

Intraoperative lung ultrasound is a feasible and effective adjunct in robotic thoracic surgery for accurate localization of deeply situated pulmonary nodules, overcoming tactile limitations inherent to RATS. Its integration into clinical practice may optimize surgical management of early lung lesions.

References

1. Greenfield et al. 1997 -- Use of ILU in VATS for non-palpable nodules
2. Kondo et al. -- ILU efficacy in detecting ground-glass opacities
3. Gambardella et al. -- ILU improves detection of nodules <10 mm
4. Zhou et al. 2017 -- ILU as an alternative finger in robotic surgery
5. Fiorelli et al. -- Feasibility of ILU during RATS
6. Study Authors 2024-2025 -- Prospective evaluation of ILU in RATS