Where Every Beat and Breath Counts…Cardiothoracic surgery involves the management and repair of the organs within the chest cavity and the chest wall. Cardiac surgeons operate on the heart and great vessels to address insufficient circulatory flow and valvular abnormalities, along with aortic wall weakening, dissection, and rupture. General thoracic surgeons resect cancers of the lungs, mediastinum, and esophagus and reconstruct anomalies of the rib cage and diaphragm. Congenital heart surgeons repair inborn cardiac defects for newborns and infants, but also on a growing population of adults who grew up with these repaired defects and require additional surgery. Cardiothoracic surgery requires a foundation of multiorgan anatomy and physiology, the knowledge of medical management to support the heart and lungs throughout the perioperative period, and close multidisciplinary clinical collaboration to develop the most effective and safe approach for treating pathology.
Necessary skills of cardiac surgeons include safe circulatory arrest of the heart, interpreting echocardiographic images to assess cardiac hemodynamics, and synthesizing real-time data from electrocardiographic monitoring and vitals for intraoperative decision-making. Cardiac surgeons must also be competent in providing mechanical circulatory support for heart failure and administering inotropes and vasopressors for cardiac support. General thoracic surgeons must be proficient in a number of endoscopic procedures (bronchoscopy, esophagoscopy, endoscopic ultrasound) to evaluate and manage the airway, esophageal and stage mediastinal lymph nodes. They are increasingly trained in minimally invasive techniques of video-assisted (VATS) and robotic surgery to perform lung resections, such as a wedge, segmentectomy, lobectomy, or pneumonectomy. Additional expertise is required to treat esophageal cancer/benign disorders, while airway and chest wall pathology may necessitate tracheal or bronchial sleeve resection and chest wall reconstruction, and diaphragmatic hernias. Both cardiac and thoracic surgeons may perform heart or lung transplants.
Congenital heart surgeons repair structural heart defects present at birth, operating on patients ranging from newborns to adults living with lifelong congenital conditions. The work requires exceptional precision on some of the smallest, most delicate anatomy in surgery, often across staged operations and years of follow-up, making it one of the most demanding and academically concentrated subspecialties in cardiothoracic surgery. They also offer heart and/or lung transplantation.
Cardiothoracic surgery training can be achieved through a variety of pathways:
- Traditional model – “Independent Programs”
In the traditional model, residents complete 5 years of general surgery residency that is sometimes extended to 6-7 years with dedicated research time, before applying to a cardiothoracic surgery fellowship during the PGY-4 year. Cardiothoracic fellowship training ranges from 2-3 years depending on the institution. Traditional cardiothoracic surgery graduates are eligible for board certification in both general surgery (ABS) and thoracic surgery (ABTS).
- 4+3 model – “Joint General/Thoracic Surgery”
In the 4+3 model, residents receive 4 years of general surgery training followed by 3 years of cardiothoracic fellowship at a single institution. They usually match early during general surgery training, though a few programs will match directly from medical school. Applicants interested in the 4+3 training pathway are committed to cardiothoracic surgery early but wish to obtain a foundational general surgical skillset. These graduates are eligible for ABS and ABTS board certification—generally ideal if one wants to pursue general thoracic surgery.
- I-6 model – “Integrated Program”
In the integrated thoracic surgery model, students match directly from medical school into a 6-year cardiothoracic surgery residency. This curriculum provides comprehensive training in both cardiac and thoracic surgery, but the majority focus on the former. Programs now incorporate 1-2 years of dedicated research midway through training. Integrated graduates are eligible for ABTS board certification only.
- Congenital Heart Training
Congenital heart surgery training follows a full cardiothoracic residency with an additional 2 years of dedicated fellowship, typically at high-volume children's hospitals or university-affiliated congenital centers. Given the field's small size and the case volume needed for competence, fellowship positions are highly competitive and limited in number. To become board certified in congenital heart surgery through the ABTS, one must have passed the initial certification process for thoracic surgery.
After completing any of these pathways, cardiothoracic surgeons may pursue additional, concentrated training through a superfellowship to build expertise in a specific subspecialty. Common areas include congenital cardiac surgery, heart and lung transplantation with mechanical circulatory support, complex aortic surgery, minimally invasive and robotic thoracic surgery, esophageal surgery, thoracic surgical oncology and ICU care. Superfellowship training is common among surgeons targeting academic careers or a highly focused practice, though many surgeons practice successfully in broad adult cardiac or general thoracic surgery without it.
For further information on training and board certification requirements, visit the American Board of Thoracic Surgery and the Thoracic Surgery Directors Association. The relevant professional societies include the American Association for Thoracic Surgery (AATS), the General Thoracic Surgical Club (GTSC), the Society of Thoracic Surgeons (STS), the Southern Thoracic Surgical Association (STSA) and the Western Thoracic Surgical Association (WTSA). Each of these organizations offer scholarships for mentorship and meeting travel awards for both medical students and residents.
Cardiothoracic Surgery as a Career
Cardiothoracic surgery is a field that is as fulfilling as it is challenging. Operations are dynamic and high risk, requiring sound judgment under pressure and composure to adapt in real time to changing physiology. These operations are lifesaving, and often cardiothoracic surgeons get to see patients return to full and active lives after successful surgical intervention. Arguably, these can be the most challenging and sickest patients in the hospital.
Although a quarter of all cardiothoracic surgeons do both cardiac and general thoracic surgery, most subspecialize in one or the other field due to the growing complexities of procedures and diseases. A smaller proportion (about 8%) pursue congenital heart surgery. Women continue to have a greater presence in the cardiothoracic surgical workforce and now make up about 30% of all CT surgeons supported by a dedicated organization (Women in Thoracic Surgery).
This field is rapidly evolving through novel technologies, including transcatheter valve replacement, robotic and minimally invasive approaches, extracorporeal membrane oxygenation (ECMO), durable mechanical circulatory support, and heart and lung transplantation, offering more individualized strategies and expanding the potential for improved outcomes.
Basic science research is a crucial pillar that drives cardiothoracic surgery's next generation of solutions—understanding myocardial protection and ischemia-reperfusion injury; developing better valve materials and mechanical circulatory support devices; understanding the biology and response of thoracic cancers; and approaches to transplant rejection and organ preservation.
Cardiothoracic surgery is deeply collaborative. Cardiothoracic surgeons work alongside anesthesiologists, perfusionists, intensivists, cardiologists, pulmonologists, gastroenterologists, medical/radiation oncologists, and advanced practice providers. Outcomes depend as much on leadership and communication as on operative skill. General thoracic surgery, unlike other subspecialties, crosses almost every medical and surgical discipline, which is highly rewarding in managing a wide range of disorders but also requires a command of medical knowledge that keeps the field intellectually engaging and clinically resilient.
The length and intensity of training also make cardiothoracic surgery a heavily mentored discipline. Residents and fellows learn through close apprenticeship in the operating room, and the relationships formed with mentors often shape the trainee’s technique, judgment, and career for years to come. It is a field that draws passionate and driven people, fostering a close-knit community committed to excellence and one another.
Training requires a commitment to lifelong learning, as the pathways are extensive and rigorous. The work demands stamina, dedication, and continued self-evaluation while working in a high-risk organ system. Those who strive for technical precision and enjoy complex problem-solving will find that cardiothoracic surgery is a career that constantly tests the limits of their abilities and provides the satisfaction of restoring health to some of the highest-acuity patients.
Ultimately, a career in cardiothoracic surgery offers the opportunity to make a significant impact on patients’ lives and the distinct privilege of witnessing profound physiology in action—watching the heart begin to beat after coming off bypass or the lungs reinflate and perfuse after ventilation.
Annie Wang, BA, MSIV
Baltimore, MD
Stephen C. Yang, MD, FACS, MAMSE
Baltimore, MD
July, 2026
