Dr. Guenthart is a board-certified, fellowship-trained cardiothoracic surgeon. He is a clinical assistant professor in the Department of Cardiothoracic Surgery.

He specializes in providing leading-edge surgical treatment for people with cancer and end-stage heart and lung disease. He performs the full range of surgical procedures ranging from minimally invasive thoracic surgery to heart and lung transplantation. Dr. Guenthart practices all aspects of thoracic surgery, including procedures for benign and malignant conditions of the airway, lung, mediastinum, esophagus, and foregut. He has a particular interest in minimally invasive techniques and has extensive experience in video-assisted thoracoscopic surgical (VATS), laparoscopic, robotic, endoscopic, and bronchoscopic approaches.

Dr. Guenthart earned his medical degree at Temple University School of Medicine. He completed general surgery residency at Cornell and a post-doctoral research fellowship in tissue bioengineering at Columbia University in the Laboratory for Stem Cells and Tissue Engineering. He then completed cardiothoracic surgery fellowship and advanced fellowship training in cardiothoracic transplantation and mechanical circulatory support at Stanford University.

Dr. Guenthart has conducted research supported by grants from the National Institutes of Health, Stanford University School of Medicine, and Columbia University. Dr. Guenthart has a particular interest in end-stage lung disease and his research focuses on lung perfusion and bioengineering strategies to promote lung recovery and regeneration. He has published in peer-reviewed journals such as Nature Medicine, Nature Biomedical Engineering, the Journal of Heart and Lung Transplantation. He has made numerous presentations to his peers at national conferences and given invited talks on patient selection, organ allocation, and other aspects of transplantation.

Dr. Guenthart is a member of the Society of Thoracic Surgeons, Western Thoracic Surgical Association, Biomedical Engineering Society, American College of Surgeons, Association for Academic Surgery, and Alpha Omega Alpha Medical Honor Society.

Clinical Focus

  • Cardiothoracic Surgery

Academic Appointments

Professional Education

  • Fellowship: Stanford University Dept of Cardiothoracic Surgery (2022) CA
  • Fellowship: Stanford University Dept of Cardiothoracic Surgery CA
  • Board Certification: American Board of Surgery, General Surgery (2020)
  • Residency: New York Presbyterian Cornell Campus General Surgery Residency (2019) NY
  • Medical Education: Temple University School of Medicine Registrar (2012) PA

All Publications

  • Technique for xenogeneic cross-circulation to support human donor lungs ex vivo. The Journal of heart and lung transplantation : the official publication of the International Society for Heart Transplantation Kelly Wu, W., Guenthart, B. A., O'Neill, J. D., Hozain, A. E., Tipograf, Y., Ukita, R., Stokes, J. W., Patel, Y. J., Pinezich, M., Talackine, J. R., Cardwell, N. L., Fung, K., Vunjak-Novakovic, G., Bacchetta, M. 2022


    Xenogeneic cross-circulation (XC) is an experimental method for ex vivo organ support and recovery that could expand the pool of donor lungs suitable for transplantation. The objective of this study was to establish and validate a standardized, reproducible, and broadly applicable technique for performing xenogeneic XC to support and recover injured human donor lungs ex vivo.Human donor lungs (n = 9) declined for transplantation were procured, cannulated, and subjected to 24 hours of xenogeneic XC with anesthetized xeno-support swine (Yorkshire/Landrace) treated with standard immunosuppression (methylprednisolone, mycophenolate mofetil, tacrolimus) and complement-depleting cobra venom factor. Standard lung-protective perfusion and ventilation strategies, including periodic lung recruitment maneuvers, were used throughout xenogeneic XC. Every 6 hours, ex vivo donor lung function (gas exchange, compliance, airway pressures, pulmonary vascular dynamics, lung weight) was evaluated. At the experimental endpoint, comprehensive assessments of the lungs were performed by bronchoscopy, histology, and electron microscopy. Student's t-test and 1-way analysis of variance with Dunnett's post-hoc test was performed, and p < 0.05 was considered significant.After 24 hours of xenogeneic XC, gas exchange (PaO2/FiO2) increased by 158% (endpoint: 364 ± 142 mm Hg; p = 0.06), and dynamic compliance increased by 127% (endpoint: 46 ± 20 ml/cmH2O; p = 0.04). Airway pressures, pulmonary vascular pressures, and lung weight remained stable (p > 0.05) and within normal ranges. Over 24 hours of xenogeneic XC, gross and microscopic lung architecture were preserved: airway bronchoscopy and parenchymal histomorphology appeared normal, with intact blood-gas barrier.Xenogeneic cross-circulation is a robust method for ex vivo support, evaluation, and improvement of injured human donor lungs declined for transplantation.

    View details for DOI 10.1016/j.healun.2022.11.002

    View details for PubMedID 36456408

  • Type A Aortic Dissection With Concurrent Aortic Valve Endocarditis, Subarachnoid Hemorrhage, and Disseminated Intravascular Coagulation. JACC. Case reports Elde, S. F., Guenthart, B. A., de Biasi, A., Dalal, A. R., Casselman, K. G., Hiesinger, W., Burton, E. C. 2022; 4 (14): 839-843


    We describe surgical repair of a Stanford Type A aortic dissection with concurrent aortic valve Streptococcus equi endocarditis in the setting of subarachnoid hemorrhage and disseminated intravascular coagulation. Multidisciplinary collaboration among specialists from a variety of disciplines is essential when treating acutely ill cardiovascular patients with multisystem involvement. (Level of Difficulty: Beginner.).

    View details for DOI 10.1016/j.jaccas.2021.05.008

    View details for PubMedID 35912321

  • Half of Anastomotic Leaks after Esophagectomy are Undetected on Initial Postoperative Esophagram. The Annals of thoracic surgery Elliott, I. A., Berry, M. F., Trope, W., Lui, N. S., Guenthart, B. A., Liou, D. Z., Whyte, R. I., Backhus, L. M., Shrager, J. B. 2022


    The sensitivity of fluoroscopic esophagrams with oral contrast to exclude anastomotic leak after esophagectomy is not well-documented, and the consequences of missing a leak in this setting have not been previously described.We performed a retrospective cohort study of a prospectively maintained institutional database of patients undergoing esophagectomy with esophagogastric anastomosis 2008-2020. Relevant details regarding leaks, management, and outcomes were obtained from the database and formal chart review. Statistical analysis was performed to compare patients with and without leaks, and those with false negative versus positive esophagrams.There were 384 patients who underwent esophagectomy with gastric reconstruction: the majority were Ivor-Lewis (82%), and 51% were wholly or partially minimally-invasive. Using a broad definition of leak, 55 patients (16.7%) developed an anastomotic leak. Twenty-seven of the 55 patients (49%) who ultimately were found to have a leak initially had a negative esophagram (performed on average on postoperative day 6). Those with a negative initial esophagram were more likely to have an uncontained leak (81% vs. 29%, p<0.01), require unplanned readmission (70% vs. 39%, p=0.02), and undergo reoperation (44% vs. 11%, p<0.01).Early postoperative esophagrams intended to evaluate anastomotic integrity have a low sensitivity of 51%, and leaks missed on initial esophagram have greater clinical consequences than those identified on initial esophagram. These findings suggest a high index of suspicion must be maintained even after a normal esophagram and calls into question the common practice of using this test to triage patients for diet advancement.

    View details for DOI 10.1016/j.athoracsur.2022.04.053

    View details for PubMedID 35618049

  • Pathological remodeling of distal lung matrix in end-stage cystic fibrosis patients. Journal of cystic fibrosis : official journal of the European Cystic Fibrosis Society Pinezich, M. R., Tamargo, M. A., Fleischer, S., Reimer, J. A., Hudock, M. R., Hozain, A. E., Kaslow, S. R., Tipograf, Y., Soni, R. K., Gavaudan, O. P., Guenthart, B. A., Marboe, C. C., Bacchetta, M., O'Neill, J. D., Dorrello, N. V., Vunjak-Novakovic, G. 2022


    Manifestations of cystic fibrosis, although well-characterized in the proximal airways, are understudied in the distal lung. Characterization of the cystic fibrosis lung 'matrisome' (matrix proteome) has not been previously described, and could help identify biomarkers and inform therapeutic strategies.We performed liquid chromatography-mass spectrometry, gene ontology analysis, and multi-modal imaging, including histology, immunofluorescence, and electron microscopy for a comprehensive evaluation of distal human lung extracellular matrix (matrix) structure and composition in end-stage cystic fibrosis.Quantitative proteomic profiling identified sixty-eight (68) matrix constituents with significantly altered expression in end-stage cystic fibrosis. Over 90% of significantly different matrix peptides detected, including structural and basement membrane proteins, were expressed at lower levels in cystic fibrosis. However, the total abundance of matrix in cystic fibrosis lungs was not significantly different from control lungs, suggesting that cystic fibrosis leads to loss of diversity among lung matrix proteins rather than an absolute loss of matrix. Visualization of distal lung matrix via immunofluorescence and electron microscopy revealed pathological remodeling of distal lung tissue architecture and loss of alveolar basement membrane, consistent with significantly altered pathways identified by gene ontology analysis.Dysregulation of matrix organization and aberrant wound healing pathways are associated with loss of matrix protein diversity and obliteration of distal lung tissue structure in end-stage cystic fibrosis. While many therapeutics aim to functionally restore defective cystic fibrosis transmembrane conductance regulator (CFTR), drugs that target dysregulated matrix pathways may serve as adjunct interventions to support lung recovery.

    View details for DOI 10.1016/j.jcf.2022.04.016

    View details for PubMedID 35525782

  • Sound-guided assessment and localization of pulmonary air leak BIOENGINEERING & TRANSLATIONAL MEDICINE Pinezich, M. R., Mir, S., Reimer, J. A., Kaslow, S. R., Chen, J., Guenthart, B. A., Bacchetta, M., O'Neill, J. D., Vunjak-Novakovic, G., Kim, J. 2022

    View details for DOI 10.1002/btm2.10322

    View details for Web of Science ID 000790166300001

  • Imaging-Guided Bioreactor for Generating Bioengineered Airway Tissue. Journal of visualized experiments : JoVE Mir, S. M., Chen, J., Pinezich, M. R., O'Neill, J. D., Guenthart, B. A., Vunjak-Novakovic, G., Kim, J. 2022


    Repeated injury to airway tissue can impair lung function and cause chronic lung disease, such as chronic obstructive pulmonary disease. Advances in regenerative medicine and bioreactor technologies offer opportunities to produce lab-grown functional tissue and organ constructs that can be used to screen drugs, model disease, and engineer tissue replacements. Here, a miniaturized bioreactor coupled with an imaging modality that allows in situ visualization of the inner lumen of explanted rat trachea during in vitro tissue manipulation andculture is described. Using this bioreactor, the protocol demonstrates imaging-guided selective removal of endogenous cellular components while preserving the intrinsic biochemical features and ultrastructure of the airway tissue matrix. Furthermore, the delivery, uniform distribution, and subsequent prolonged culture of exogenous cells on the decellularized airway lumen with optical monitoring in situ are shown. The results highlight that the imaging-guided bioreactor can potentially be used to facilitate the generation of functional in vitro airway tissues.

    View details for DOI 10.3791/63544

    View details for PubMedID 35467661

  • Exvivo aortic valve replacement before orthotopic heart transplantation. JTCVS techniques Elde, S. F., Guenthart, B. A., Shudo, Y., Woo, Y. J. 2022; 12: 118-120

    View details for DOI 10.1016/j.xjtc.2022.01.008

    View details for PubMedID 35403016

  • Cannulation Strategies in Ex Vivo Lung Perfusion. ASAIO journal (American Society for Artificial Internal Organs : 1992) Guenthart, B. A., O'Neill, J. D., Bacchetta, M. 2021

    View details for DOI 10.1097/MAT.0000000000001621

    View details for PubMedID 34882646

  • Homogeneous Distribution of Exogenous Cells onto De-epithelialized Rat Trachea via Instillation of Cell-Loaded Hydrogel. ACS biomaterials science & engineering Chen, J., Mir, S. M., Pinezich, M. R., O'Neill, J. D., Guenthart, B. A., Bacchetta, M., Vunjak-Novakovic, G., Huang, S. X., Kim, J. 2021


    Injured or diseased airway epithelium due to repeated environmental insults or genetic mutations can lead to a functional decline of the lung and incurable lung diseases. Bioengineered airway tissue constructs can facilitate in vitro investigation of human lung diseases and accelerate the development of effective therapeutics. Here, we report robust tissue manipulation modalities that allow: (i) selective removal of the endogenous epithelium of in vitro cultured airway tissues and (ii) spatially uniform distribution and prolonged cultivation of exogenous cells that are implanted topically onto the denuded airway lumen. Results obtained highlight that our approach to airway tissue manipulation can facilitate controlled removal of the airway epithelium and subsequent homogeneous distribution of newly implanted cells. This study can contribute to the creation of innovative tissue engineering methodologies that can facilitate the treatment of lung diseases, such as cystic fibrosis, primary ciliary dyskinesia, and chronic obstructive pulmonary disease.

    View details for DOI 10.1021/acsbiomaterials.1c01031

    View details for PubMedID 34874712

  • Extended Static Hypothermic Preservation In Cardiac Transplantation: A Case Report. Transplantation proceedings Guenthart, B. A., Krishnan, A., Koyano, T., La Francessca, S., Chan, J., Alassar, A., Macarthur, J. W., Shudo, Y., Hiesinger, W., Woo, Y. J. 2021


    BACKGROUND: The donor shortage poses a major limitation to use of heart transplantation. Novel strategies such as use of expanded-criteria donors with prolonged ischemia times are being employed to address this need. Recent developments in static hypothermia have allowed for the safe use of cardiac allografts with prolonged ischemic times.CASE REPORT: We present the case of a 68-year-old woman with valvular cardiomyopathy refractory to medical therapy who underwent orthotopic heart transplantation with a cardiac allograft exposed to elevated ischemic times. This was achieved through use of the federally approved SherpaPak Cardiac Transport System for transportation of the allograft. This method of static hypothermic organ preservation allowed for a 330-minute total ischemic time, including 283 minutes of storage within the preservation system. The patient tolerated the procedure well and was discharged on postoperative day 10, with excellent graft function and no evidence of rejection 3 months postoperatively.CONCLUSIONS: Though traditionally ischemic times of 240 minutes or less are recommended for cardiac allografts, we demonstrate, to our knowledge, the longest reported ischemic time of 330 minutes via use of a novel method of static hypothermia for organ preservation. The recipient had an excellent outcome postoperatively, demonstrating the potential for this new organ preservation system to expand the donor pool and improve access and use of heart transplantation.

    View details for DOI 10.1016/j.transproceed.2021.08.021

    View details for PubMedID 34521542

  • Xenogeneic support for the recovery of human donor organs. The Journal of thoracic and cardiovascular surgery O'Neill, J. D., Guenthart, B. A., Hozain, A. E., Bacchetta, M. 2021



    View details for DOI 10.1016/j.jtcvs.2021.07.055

    View details for PubMedID 34607726

  • Resection of a Giant Epithelioid Hemangioendothelioma Arising from the Superior Vena Cava. The Annals of thoracic surgery Elliott, I. A., Kasinpila, P., Guenthart, B. A., MacArthur, J. W., Berry, M. F. 2021


    Epithelioid hemangioendothelioma is a rare malignant vascular sarcoma. Here we present a patient with a very large tumor arising from the superior vena cava (SVC), in whom a resection with negative margins was accomplished using veno-venous bypass and bovine pericardial patch reconstruction of the SVC.

    View details for DOI 10.1016/j.athoracsur.2021.01.034

    View details for PubMedID 33529605

  • First lung and kidney multi-organ transplant following COVID-19 Infection. The Journal of heart and lung transplantation : the official publication of the International Society for Heart Transplantation Guenthart, B. A., Krishnan, A., Alassar, A., Madhok, J., Kakol, M., Miller, S., Cole, S. P., Rao, V. K., Acero, N. M., Hill, C. C., Cheung, C., Jackson, E. C., Feinstein, I., Tsai, A. H., Mooney, J. J., Pham, T., Elliott, I. A., Liou, D. Z., La Francesca, S., Shudo, Y., Hiesinger, W., MacArthur, J. W., Brar, N., Berry, G. J., McCarra, M. B., Desai, T. J., Dhillon, G. S., Woo, Y. J. 2021


    As the world responds to the global crisis of the COVID-19 pandemic an increasing number of patients are experiencing increased morbidity as a result of multi-organ involvement. Of these, a small proportion will progress to end-stage lung disease, become dialysis dependent, or both. Herein, we describe the first reported case of a successful combined lung and kidney transplantation in a patient with COVID-19. Lung transplantation, isolated or combined with other organs, is feasible and should be considered for select patients impacted by this deadly disease.

    View details for DOI 10.1016/j.healun.2021.02.015

    View details for PubMedID 34059432

  • Non-destructive vacuum-assisted measurement of lung elastic modulus. Acta biomaterialia Chen, J., Mir, S. M., Pinezich, M. R., O'Neill, J. D., Guenthart, B. A., Bacchetta, M., Vunjak-Novakovic, G., Huang, S. X., Kim, J. 2021


    In living tissues, mechanical stiffness and biological function are intrinsically linked. Alterations in the stiffness of tissues can induce pathological interactions that affect cellular activity and tissue function. Underlying connections between tissue stiffness and disease highlights the importance of accurate quantitative characterizations of soft tissue mechanics, which can improve our understanding of disease and inform therapeutic development. In particular, accurate measurement of lung mechanical properties has been especially challenging due to the anatomical and mechanobiological complexities of the lung. Discrepancies between measured mechanical properties of dissected lung tissue samples and intact lung tissues in vivo has limited the ability to accurately characterize integral lung mechanics. Here, we report a non-destructive vacuum-assisted method to evaluate mechanical properties of soft biomaterials, including intact tissues and hydrogels. Using this approach, we measured elastic moduli of rat lung tissue that varied depending on stress-strain distribution throughout the lung. We also observed that the elastic moduli of enzymatically disrupted lung parenchyma increased by at least 64%. The reported methodology enables assessment of the nonlinear viscoelastic characteristics of intact lungs under normal and abnormal (i.e., injured, diseased) conditions and allows measurement of mechanical properties of tissue-mimetic biomaterials for use in therapeutics or in vitro models. STATEMENT OF SIGNIFICANCE: Accurate quantification of tissue stiffness is critical for understanding mechanisms of disease and developing effective therapeutics. Current modalities to measure tissue stiffness are destructive and preclude accurate assessment of lung mechanical properties, as lung mechanics are determined by complex features of the intact lung. To address the need for alternative methods to assess lung mechanics, we report a non-destructive vacuum-based approach to quantify tissue stiffness. We applied this method to correlate lung tissue mechanics with tissue disruption, and to assess the stiffness of biomaterials. This method can be used to inform the development of tissue-mimetic materials for use in therapeutics and disease models, and could potentially be applied for in-situ evaluation of tissue stiffness as a diagnostic or prognostic tool.

    View details for DOI 10.1016/j.actbio.2021.06.037

    View details for PubMedID 34192570

  • Surgical technique for atrial-esophageal fistula repair after catheter ablation: An underrecognized complication JTCVS TECHNIQUES Guenthart, B. A., Sun, B., De Biasi, A., Fischbein, M. P., Liou, D. Z. 2020; 4: 169-172
  • Surgical technique for atrial-esophageal fistula repair after catheter ablation: An underrecognized complication. JTCVS techniques Guenthart, B. A., Sun, B., De Biasi, A., Fischbein, M. P., Liou, D. Z. 2020; 4: 169-172

    View details for DOI 10.1016/j.xjtc.2020.07.022

    View details for PubMedID 34318000

    View details for PubMedCentralID PMC8303005

  • Gut bioengineering strategies for regenerative medicine. American journal of physiology. Gastrointestinal and liver physiology O'Neill, J. D., Pinezich, M. R., Guenthart, B. A., Vunjak-Novakovic, G. 2020


    Gastrointestinal disease burden continues to rise in the United States and worldwide. The development of bioengineering strategies to model gut injury or disease and to re-establish functional gut tissue could expand therapeutic options and improve clinical outcomes. Current approaches leverage a rapidly evolving gut bioengineering toolkit aimed at: (i) de-novo generation of gut-like tissues at multiple scales for microtissue models or implantable grafts, and (ii) regeneration of functional gut in vivo. Although significant progress has been made in intestinal organoid cultures and engineered tissues, development of predictive in-vitro models and effective regenerative therapies remains challenging. In this review, we survey emerging bioengineering tools and recent methodological advances to identify future opportunities and challenges in gut bioengineering for disease modeling and regenerative medicine.

    View details for DOI 10.1152/ajpgi.00206.2020

    View details for PubMedID 33174453

  • Intracardiac paragangliomas: surgical approach and perioperative management. General thoracic and cardiovascular surgery Guenthart, B. A., Trope, W., Keeyapaj, W., Weiel, J. J., Edmonson, A., MacArthur, J. W., Annes, J. P., Woo, Y. J., Lui, N. S. 2020


    Intracardiac paragangliomas most commonly arise from the left atrium and are often infiltrative and densely adherent to surrounding structures. Given their rarity, only scattered reports exist in the literature and standardized perioperative and surgical management is not well established. We describe a case of a 60-year-old woman with a mildly functioning intracardiac paraganglioma in which division of the superior vena cava improved exposure and enabled a complex limited resection. Further, we provide an overview of the diagnostic workup, perioperative medical management, surgical approach, and surveillance strategy in patients with these challenging tumors.

    View details for DOI 10.1007/s11748-020-01503-2

    View details for PubMedID 33074472

  • Greater Ipsilateral Rectus Muscle Atrophy after Robotic Thoracic Surgery Compared to Open and VATS Approaches Wang, Y., Bhandari, P., Trope, W., Guenthart, B. A., Guo, H., Liou, D., Backhus, L. M., Berry, M., Ben Shrager, J., Lui, N. ELSEVIER SCIENCE INC. 2020: S289
  • Xenogeneic cross-circulation for extracorporeal recovery of injured human lungs. Nature medicine Hozain, A. E., O'Neill, J. D., Pinezich, M. R., Tipograf, Y., Donocoff, R., Cunningham, K. M., Tumen, A., Fung, K., Ukita, R., Simpson, M. T., Reimer, J. A., Ruiz, E. C., Queen, D., Stokes, J. W., Cardwell, N. L., Talackine, J., Kim, J., Snoeck, H., Chen, Y., Romanov, A., Marboe, C. C., Griesemer, A. D., Guenthart, B. A., Bacchetta, M., Vunjak-Novakovic, G. 2020; 26 (7): 1102–13


    Patients awaiting lung transplantation face high wait-list mortality, as injury precludes the use of most donor lungs. Although ex vivo lung perfusion (EVLP) is able to recover marginal quality donor lungs, extension of normothermic support beyond 6h has been challenging. Here we demonstrate that acutely injured human lungs declined for transplantation, including a lung that failed to recover on EVLP, can be recovered by cross-circulation of whole blood between explanted human lungs and a Yorkshire swine. This xenogeneic platform provided explanted human lungs a supportive, physiologic milieu and systemic regulation that resulted in functional and histological recovery after 24h of normothermic support. Our findings suggest that cross-circulation can serve as a complementary approach to clinical EVLP to recover injured donor lungs that could not otherwise be utilized for transplantation, as well as a translational research platform for immunomodulation and advanced organ bioengineering.

    View details for DOI 10.1038/s41591-020-0971-8

    View details for PubMedID 32661401

  • Resident education in robotic thoracic surgery VIDEO-ASSISTED THORACIC SURGERY Guenthart, B. A., Lui, N. S. 2020; 5
  • Commentary: Lung cancer outcomes reporting within the VA system: room for improvement. Seminars in thoracic and cardiovascular surgery Guenthart, B. A., Backhus, L. M., Lui, N. S. 2020

    View details for DOI 10.1053/j.semtcvs.2020.06.008

    View details for PubMedID 32569647