Donor Posterior Atrial Flap Rotation for Left Atrial Cuff Reconstruction in Lung Transplantation
October 11th, 2024
This protocol describes a new method for effectively reconstructing donor atrial cuff anterior wall defects during lung transplantation through the rotation of the donor posterior atrial flap.
We are dedicated to conducting research on lung transplantation, which demands challenges by the scarcity of donors. In order to enhance the quality and the utilization of donor lungs, we employ the novel surgical techniques for reconstructing the commonly injured left atrial cuff. Cuff reconstruction requires the availability of page material.
Excess donor pericardial tissue is most commonly used, although excess atrial tissue can also be utilized. We described in detail a novel surgical technique for the repairing left atrial cuff defect by rotating the posterior atrial flab during lung transplantation. The key aspect of this new technique is retention of the intact posterior atrial wall of the donor lung.
By pruning the excess posterior atrial wall, it forms an actual flab, and the rotating of the atrial flab provides a page for the repair of the defective anterior wall. Compared to the other techniques, this new method can repair the anterior wall defect in vivo by using the excess left atrial tissue of the donor. The operation is more convenient, and the anastomosis time is effective reduce along with the cold ischemia time.
The posterior atrial flab rotating left atrial cuff repair technique provides a feasible strategy for the repair of left atrial cuff defects, and improves the effective utilization rate of the donor lung. To begin, position the patient horizontally with the back slightly elevated and hands spread horizontally in a cross position and securely fixed. Then, disinfect the patient's skin near the surgical area.
After removing the recipient's diseased lungs, treat the vascular and trachea residuals prior to anastomosis. Then, prepare the donor for lung extraction. Divide the posterior atrial wall of the donor lung, ensuring that the excess posterior atrial wall is included on the side with the anterior wall defect.
Sever the left and right pulmonary arteries at their junction. Free the left main bronchus, and sever it before separating the left and right donor lungs. Place the left donor lung in an organ preservation solution at four degrees Celsius.
Free the pulmonary artery and atrial cuff fully. Trim the right donor lung, ensuring the main bronchus has two to three cartilage rings. For the anastomosis of the primary bronchus and pulmonary artery, place the repaired right donor lung into the right chest.
Suture the bronchial membrane with a 4-0 polydioxanone suture line, and then the bronchial cartilage with a 4-0 poly line. Use a bronchoscope to confirm that the airway is clear and open after the bronchial anastomosis is completed. Then, suture the soft tissue around the bronchial anastomosis with 4-0 poly line.
Anastomose the pulmonary artery using a 5-0 poly line continuous suture. After preparing the recipient, clamp the left atrium at the proximal end of the intersection of the upper and lower pulmonary veins. Cut the excess posterior wall of the donor atrial cuff from the bottom upward by comparing the distance between the posterior atrial edge of the donor and recipient.
Trim the excess posterior wall to form an atrial flap connected to the upper edge of the donor atrial cuff by the pedicle. Using a continuous 4-0 PROLENE suture, anastomose the posterior edges of the atrial cuffs from the bottom to the top. Continue suturing upon reaching the posterior atrial flap to anastomose the edge of the flap near the lung with the anterior atrial edge of the recipient.
Ensure that the suture ends meet at the lower edge of the anastomosis and tie them off. Anastomose the other edge of the atrial flap and the anterior atrial edge of the donor from top to bottom with a 4-0 PROLENE line continuous suture. Leave the last two needles untightened to serve as exhaust holes.
Temporarily release the pulmonary artery-blocking forceps, allowing the blood to flow out from the exhaust hole of the atrial anastomosis. Clamp the pulmonary artery with blocking forceps, loosen and remove the atrial forceps, and then tighten the PROLENE suture of the atrial sleeve anastomosis after fully exhausting the air. Release and remove the pulmonary artery-blocking forceps to allow full blood flow.
Verify that the anterior wall of the anastomosis is wide and well-filled with no bleeding manifestations. After bilateral chest closure, monitor and record the flow rate of the bilateral pulmonary veins using an esophageal ultrasound. Postoperative pulmonary artery systolic blood pressure was significantly lower than preoperative values in all three groups.
No significant differences in pulmonary systolic blood pressure were found between the three surgical groups postoperatively. The pulmonary vein flow velocities showed no significant differences between the three groups of posterior atrial flap, aortic patch, and pericardial patch. Right atrial cuff anastomosis time was significantly shorter for the posterior atrial flap group compared to the aortic patch and pericardial patch groups.
No significant difference was observed in the left atrial cuff anastomosis time across the three groups.
Overview
This protocol describes a novel surgical technique for reconstructing donor atrial cuff anterior wall defects during lung transplantation. The method involves rotating the donor posterior atrial flap to enhance the repair process.
Key Study Components
Area of Science
- Lung transplantation
- Surgical techniques
- Cardiac anatomy
Background
- Challenges in lung transplantation include donor scarcity and quality.
- Common injuries occur to the left atrial cuff during procedures.
- Excess donor pericardial and atrial tissues can be utilized for repairs.
- Retention of the intact posterior atrial wall is crucial for effective reconstruction.
Purpose of Study
- To improve the quality and utilization of donor lungs.
- To present a new technique for repairing left atrial cuff defects.
- To reduce anastomosis time and cold ischemia time during lung transplantation.
Methods Used
- Positioning the patient and disinfecting the surgical area.
- Preparing the donor lung and performing necessary dissections.
- Trimming the posterior atrial wall to form a flap for repair.
- Anastomosing the atrial cuffs using continuous sutures.
Main Results
- The new technique effectively repairs anterior wall defects in vivo.
- Postoperative pulmonary artery systolic blood pressure was significantly lower.
- No significant differences in pulmonary systolic blood pressure among groups.
- Right atrial cuff anastomosis time was shorter for the new technique.
Conclusions
- The posterior atrial flap technique enhances donor lung utilization.
- It offers a feasible strategy for repairing left atrial cuff defects.
- The method is more convenient and reduces surgical time.
Frequently Asked Questions
Executive Industry Relevance
Efficient reconstruction of donor left atrial cuff defects is critical for maximizing donor lung utilization in transplantation workflows. The posterior atrial flap rotation technique addresses a key surgical bottleneck by enabling rapid, reliable repair of anterior wall defects, directly impacting organ availability and procedural throughput. This innovation supports portfolio-level improvements in transplant program efficiency and resource allocation.
Strategic Applications in Biopharma R&D
Early Discovery & Target Validation
- Enables mechanistic de-risking of surgical repair strategies for atrial cuff defects.
- Supports functional validation of tissue engineering approaches in transplantation models.
- Facilitates hypothesis testing around donor tissue utilization and repair outcomes.
Screening & Assay Development
- Provides a standardized surgical model for evaluating repair materials and techniques.
- Enables reproducible measurement of anastomosis time and hemodynamic outcomes.
- Supports quantitative assessment of pulmonary vein flow and pressure post-repair.
Translational & Preclinical Research
- Aligns with translational goals to improve donor organ utilization rates.
- Demonstrates continuity from surgical innovation to measurable functional outcomes.
- Informs risk-adjusted advancement of new repair strategies in preclinical models.
Pipeline & Workflow Integration
This surgical technique integrates into the transplantation workflow at the donor lung preparation and anastomosis stage, bridging discovery of repair strategies with operational implementation.
- Discovery Biology: Validates the feasibility of using donor atrial tissue for in vivo repair of anterior wall defects.
- Screening: Standardizes assessment of anastomosis time and flow metrics across repair methods.
- Analytics: Enables quantitative comparison of pulmonary vein flow and systolic pressures post-repair.
- Translational Research: Supports improved donor lung utilization and functional recovery metrics.
- Enterprise Reuse: Establishes a reusable surgical protocol for future repair material and technique evaluations.
Operational & Enterprise Impact
- Scientific Value: Increases predictive confidence in repair outcomes and reduces mechanistic ambiguity in defect reconstruction.
- Operational Value: Streamlines surgical workflows by reducing anastomosis and cold ischemia times.
- Strategic Value: Enhances go/no-go decision-making for donor lung acceptance and repair strategies.
- Portfolio Impact: Improves risk-adjusted prioritization of surgical innovations and donor organ allocation.
Implementation Considerations
- Requires surgical expertise in donor lung preparation and atrial cuff reconstruction.
- Demands access to intraoperative imaging and hemodynamic monitoring infrastructure.
- Necessitates cross-team standardization of repair protocols and outcome measurements.
- Adaptation may be needed for varying donor tissue availability and defect presentations.
- Practical limitations include the need for intact posterior atrial wall tissue in donor lungs.
