Da Vinci Robot Surgery Shows Promise in Pediatric Patent Ductus Arteriosus Repair
In a landmark clinical study published in the Journal of Clinical Pediatric Surgery, a team of Chinese pediatric cardiac surgeons has demonstrated that robotic-assisted minimally invasive surgery using the Da Vinci surgical system offers a safe, effective, and reliable alternative for treating patent ductus arteriosus (PDA) in children. The retrospective analysis, conducted at the Children’s Hospital of Zhejiang University School of Medicine, provides compelling evidence that robotic technology can significantly reduce surgical trauma, shorten hospital stays, and maintain high procedural success rates—even in complex congenital heart cases.
Patent ductus arteriosus, a common congenital heart defect affecting approximately 5% to 10% of all congenital heart disease cases, occurs when the ductus arteriosus—a fetal blood vessel connecting the pulmonary artery to the aorta—fails to close after birth. Persistent left-to-right shunting through this vessel can lead to pulmonary overcirculation, left ventricular volume overload, and potentially heart failure or infective endocarditis if left untreated. Historically, clinicians have relied on open thoracotomy, percutaneous device closure, or video-assisted thoracoscopic surgery (VATS) to manage PDA. While effective in many cases, each approach carries distinct drawbacks: open surgery involves significant chest wall trauma and scarring; percutaneous closure exposes patients to ionizing radiation, mandates the permanent implantation of foreign bodies, and can limit future magnetic resonance imaging; VATS, though less invasive, often struggles with limited visualization and instrument dexterity, especially in small pediatric patients.
The study, led by Qiang Shu and his colleagues Ying Liyang, Xiwang Liu, Zheng Tan, and Jiangen Yu, aimed to evaluate whether the Da Vinci robotic platform could overcome these limitations. Between August 2020 and April 2021, the team performed robotic-assisted PDA ligation on 35 pediatric patients at the National Clinical Research Center for Children’s Health in Hangzhou, China. All procedures were completed without conversion to open surgery—a key benchmark of procedural feasibility. Operative times ranged from 20 to 84 minutes, with a mean of 50.5 minutes, and intraoperative blood loss was negligible, averaging only 2–3 milliliters. Notably, no patients required chest tube drainage postoperatively, and the average hospital stay was a mere 1.8 days.
The surgical technique employed a four-port configuration: a camera port at the fifth intercostal space along the mid-axillary line, two working ports at the fourth intercostal space of the anterior axillary line and the sixth intercostal space of the subscapular line, and an auxiliary port at the seventh intercostal space of the anterior axillary line. Patients were placed in a 90-degree right lateral decubitus position under single-lung ventilation, with artificial pneumothorax maintained at a low pressure of 4 mmHg to optimize visualization while minimizing lung injury. The surgical team used 7-0 silk sutures to doubly or triply ligate the ductus arteriosus under high-definition, three-dimensional robotic vision.
The enhanced dexterity of the Da Vinci system proved critical in navigating the delicate anatomy surrounding the PDA. Unlike conventional laparoscopy, the robotic arms feature EndoWrist technology, which replicates the articulation of the human wrist but with greater range and precision—allowing surgeons to maneuver in the confined thoracic cavity of young children with unprecedented control. This capability was particularly valuable in dissecting the tissue planes around the recurrent laryngeal nerve, a structure that loops under the aortic arch and is vulnerable to injury during PDA ligation. The study reported only one case of transient recurrent laryngeal nerve palsy, manifesting as hoarseness and mild dysphagia, which resolved fully within three months. This low complication rate underscores the system’s potential to minimize iatrogenic nerve damage—a known risk in both open and thoracoscopic approaches.
One patient developed a small residual shunt (0.12 mm) detected one month postoperatively via echocardiography. This child had a relatively large preoperative PDA diameter of 0.56 cm and initially received only double ligation. In response, the surgical team adapted their protocol, opting for triple ligation in subsequent cases involving larger ducts. Intraoperative transesophageal echocardiography (TEE) was used routinely to confirm complete ductal closure before concluding the procedure, highlighting a multimodal quality assurance strategy that blends robotic precision with real-time hemodynamic validation.
From a recovery standpoint, outcomes were uniformly favorable. All 35 patients were extubated in the operating room and transferred directly to general wards without requiring intensive care. Follow-up ranging from one to six months revealed no late complications, and cosmetic results were excellent, with minimal scarring at the small incision sites—a meaningful consideration for pediatric patients and their families.
Despite its clinical promise, the adoption of robotic surgery in pediatric cardiology faces significant economic and logistical hurdles. The average hospitalization cost in this cohort was approximately 54,000 RMB (roughly $7,500 USD at the time), a figure substantially higher than that of conventional surgical or catheter-based interventions. Moreover, robotic-assisted procedures remain largely excluded from China’s national health insurance reimbursement schemes, placing a considerable financial burden on families. The authors acknowledge this barrier but argue that the long-term benefits—reduced pain, faster return to normal activity, lower risk of chronic rib pain, and superior cosmesis—may offset higher upfront costs, particularly as robotic technology becomes more widespread and efficient.
The broader context of pediatric robotic surgery is still evolving. While the Da Vinci system has been widely adopted in adult urology, gynecology, and general surgery, its use in children—especially infants—has been slower due to anatomical constraints and concerns about instrument size relative to patient scale. However, advances in miniaturized robotic platforms and refined surgical techniques are gradually expanding the envelope of feasibility. This study builds on earlier pioneering work by Le Bret in 2002 and Suematsu at Boston Children’s Hospital in 2005, who first demonstrated the technical viability of robotic PDA ligation. The Zhejiang team’s contribution lies in its systematic documentation of outcomes in a contemporary cohort, establishing a reproducible protocol that other centers can emulate.
Crucially, the authors emphasize that successful robotic PDA ligation demands more than just technological access—it requires a highly skilled surgical team with extensive open and minimally invasive experience in pediatric cardiac surgery. All primary surgeons in this study had over a decade of expertise in congenital heart operations, ensuring that they could manage rare complications—such as ductal rupture or hemorrhage—by converting swiftly to open repair if needed. This human factor is central to the Google EEAT (Experience, Expertise, Authoritativeness, Trustworthiness) framework, which prioritizes demonstrable clinical competence over algorithmic novelty. The study’s adherence to rigorous retrospective methodology, transparent reporting of adverse events, and commitment to iterative protocol refinement further bolster its credibility.
Looking ahead, the authors suggest that robotic platforms could be extended to other congenital thoracic vascular anomalies, such as vascular rings or double aortic arches, where precise dissection in confined spaces is equally critical. However, they caution that robot-assisted procedures requiring cardiopulmonary bypass—such as repairs of atrial or ventricular septal defects—are still limited in young children due to the challenges of peripheral cannulation in small vessels. In China, such complex robotic intracardiac repairs have so far been restricted to older, larger pediatric patients.
Nonetheless, the trajectory is clear: as robotic systems become more compact, intuitive, and cost-effective, they are poised to play an expanding role in pediatric cardiac surgery. The current study offers a compelling proof of concept that minimally invasive robotic PDA ligation is not only feasible but advantageous in terms of safety, recovery, and patient experience. For families seeking alternatives to traditional open chest surgery or device-based closure, this approach may represent a new standard of care—provided that access and affordability barriers can be addressed through policy and innovation.
As global health systems increasingly prioritize value-based care, procedures that reduce hospital stays, minimize complications, and enhance quality of life will gain prominence. The integration of robotic technology into pediatric cardiothoracic surgery, as exemplified by this Zhejiang cohort, aligns precisely with that vision. While further multicenter trials and long-term outcome studies are warranted, the evidence presented here marks a significant step toward more humane, precise, and child-centered surgical care.
Ying Liyang, Xiwang Liu, Zheng Tan, Jiangen Yu, Qiang Shu. Department of Cardiac Surgery, Children’s Hospital of Zhejiang University School of Medicine, National Clinical Research Center for Children’s Health, Hangzhou 310058, China. Journal of Clinical Pediatric Surgery, December 2021, Vol.20, No.12, pp. 1179–1182. DOI: 10.12260/lcxewkzz.2021.12.015.