However, patients undergoing VATS also complain of a moderate degree of acute postoperative pain and the incidence of chronic postoperative pain has been reported to be similar to that with open thoracotomy (4-6).
Uniportal VATS through intercostal space has been introduced as a less invasive alternative to the traditional multiport VATS; even so working through a single intercostal space can reduce but not completely avoid the damage of the intercostal bundle (7).
In this context the uniportal subxiphoid video-assisted thoracic surgery (SVATS) has been proposed as alternative option for a variety of thoracic procedures that could completely avoid the intercostal nerve injuries (8,9).
In Shanghai Pulmonary Hospital, after a very important experience with multiport and uniportal vats resections, we started the uniportal SVATS program for lung resection in September 2014 with very good short terms results in terms of safety, post-operative pain and morbidity (10).
The aim of this study is to describe the surgical technique used by our team for uniportal SVATS lobectomy.
Indications for SVATS lobectomy
The surgical indications were early-stage lung cancer and selected cases of localized infectious lung disease or benign lung tumor discussed within our multidisciplinary team prior to surgery.
Exclusion criteria included:
- Diffuse dense adhesion;
- Lymph nodes enlargement;
- Body mass index, BMI >30;
- Cardiomegaly patients with left-side diseases;
Operating room set up and surgical instruments
The standard set-up of the operatory room includes one monitor placed cranially above the head of the patient, the first surgeon and the scrub nurse positioned on the abdominal side of the patient with the assistant positioned on the opposite side (Figure 1).
All VATS lobectomies are performed with a 10 mm, 30 degree angled HD video-thoracoscope. The 30-degree angulation allows a good vision within the chest cavity but the use of a variable angle camera could be useful during certain part of the operation in particular the lymph node dissection.
Normal VATS instruments plus dedicated instruments specially designed for SVATS [Shanghai Medical Instruments (Group) Ltd.] are used during the operations (Figure 2).
Positioning of the patients and anesthetic technique (Figure 3)
After the positioning of the double lumen tube the patients are placed in the lateral decubitus position with a backward inclination of 30° to reduce the interference deriving from the beating heart during the surgical procedure.
For left-sided operations we always put a central venous catheter line as in certain circumstances working through the subxiphoid port and pushing the pericardium can lead to circulatory instability and cardiac arrhythmias.
A 4-cm-long horizontal subxiphoid incision is made if the infrasternal angle is within normal limits (≥70°), otherwise a longitudinal incision is used in patients with infrasternal angle less than 70°.
At first, the subxiphoid incision is made and after dissection of the subcutaneous tissue the rectus abdominis muscle is exposed and its fibers dissected longitudinally to expose the xiphoid process that is completely resected to provide a widened operative access without lifting the sternum upward.
By index finger dissection, a retrosternal tunnel is created between the thoracic cavity, a wound protector is inserted and under thoracoscopic visualization the pleura is opened and the pericardial fat tissue is removed.
Basic surgical principles (Figure 6)
The camera is inserted through the port at the level of the caudal portion of the wound leaving the cephalic part utilizable for the insertion and the maneuver of the other surgical instruments.
In this setting is very important have confidence with the uniportal intercostal technique in order to reduce the fighting between the instruments.
The chest cavity is evaluated looking for unexpected pathology, and adhesions, and the lung is retracted using long thoracoscopic lung graspers designed to optimize the hilum exposure and reduce the interferences between the other instruments.
To reduce the interference of the heart beats is very useful the utilization of a long sucker with a distal curvature to push the pericardium medially being careful to not disturb the heart function or distort the mediastinal structure causing a reduction of the venous return.
A particularly designed long electrocautery blade is used to lift, dissect and cauterize the tissue.
The vessels, the fissures and the bronchus are exposed and divided sequentially, with appropriate endostaplers.
To transect minor pulmonary arteries, lymph adenectomy and division of thin portions of fissure we also use energy-based devices and surgical endoclips.
In case of conversion to multiport VATS an extra port is usually made at the level of the 5th intercostal space at the level of between the anterior and the middle ascellary lines while the conversion to open procedure is obtained doing a sparring muscle anterolateral thoracotomy at the 5th intercostal space level.
At the beginning of our experience we started doing a lymph node sampling but with the experience we are optimizing the technique and increasing the number of lymph nodes dissected gradually arriving to a systematic lymph node dissection with removal of lymph nodes from at least 3 N2 stations according to the IASLC/Mountain classification.
At the end of the procedure, one drain is placed in through subxiphoid incision and a thin percutaneous drain is placed at the level of the 8th intercostal space.
After surgery, the patient is transferred to an intensive postoperative care ward and, if no complications occur, the next day we proceed to the transfer to the normal ward.
We use early mobilization policy and lung physiotherapy.
The tube is removed when there is no air-leakage and less than 300 cc of fluid in 24 hours.
Patients are usually discharged one day after tube removal and seen 10 days later in the outpatient clinic.
Early results and comments
From November 2014 to January 2016 we performed 172 uniportal SVATS lobectomies, 126 right lobectomies and 46 left lobectomies.
We had to convert surgical approach in 12 patients (7.0%), including 5 patients (2.9%) in whom we switched to multiport VATS approach and 7 patients (4.1%) that needed thoracotomy.
The causes of conversion are indicated in Table 1.
A total of 18 patients (10.5%) had postoperative complications (see Table 1), and no 30-day mortality occurred.
Even if we recognize that a more detailed analysis of the results is required to draft any statement, in our experience uniportal SVATS lobectomy for a selected category of patients showed to be a reproducible and safe alternative to the conventional multiport and uniportal lung resection techniques.
Conflicts of Interest: The authors have no conflicts of interest to declare.
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Cite this article as: Aresu G, Wu L, Lin L, Jiang G, Jiang L. The Shanghai Pulmonary Hospital subxiphoid approach for lobectomies. J Vis Surg 2016;2:135.