Histopathological Change Following Cox-Maze IV Procedure for Atrial Fibrillation

The prevalence of atrial fibrillation and the likelihood of undergoing concomitant surgical ablation at the time of open heart surgery are increasing. Currently, the conventional cut-and-sew Maze procedure has been predominantly replaced by Cox-Maze IV procedure, in which new energy sources such as radiofrequency energy and/or cryoablation are applied. Cox-Maze IV procedure has been associated with lower rate of complications than a cut-and-sew procedure. However, some previous studies reported the lower success rate of Cox-Maze IV procedure, possibly because radiofrequency ablation or cryoablation cannot always achieve transmurality. For the success of surgical ablation, achieving transmurality, defined as complete atrial wall thickness of fibrotic changes, is of paramount importance. A review of previous articles regarding histopathological changes of the atrial tissue following surgical ablation is performed. The effectiveness of new energy sources such as radiofrequency and cryoablation in terms of histological transmurality is discussed

Extracorporeal Membrane Oxygenation Support for Post- Cardiotomy Cardiogenic Shock

Cardiogenic shock following cardiac surgery is rare, but a serious complication. Patients who suffer from severe valvular disease, low cardiac function, massive myocardial infarction, and acute aortic dissection have high risk of cardiogenic shock after surgery. Extracorporeal membrane oxygenation (ECMO) is a last resort treatment option for such patients. However, ethical concerns exist regarding whether ECMO is worthwhile for them, because it carries a huge financial burden, and the mortality of ECMO patients following cardiac surgery is reported to be as high as 60–80%. No guideline exists regarding optimal patient selection, duration of mechanical support, and management of ECMO. There are many unanswered questions in this field. This is a comprehensive review regarding the most recent available evidences in the field of ECMO support for post-cardiotomy cardiogenic shock

Collaboration between Interventional Cardiologists and Cardiac Surgeons in the Era of Heart Team Approach

Along with the rapid evolution of transcatheter interventions, interventional cardiologists are playing more and more important role in the care of cardiovascular disease. The consequence of rapid change in the landscape has been fostering new and improved relationships between interventional cardiologists and cardiac surgeons and the formulation of Heart Team to facilitate patient management. A hybrid strategy is a combination of tools available only in the catheterization laboratory with those available only in the operative room in order to gain maximum profit from both of them. In the current era, the continuous development in transcatheter procedures along with the adoption of minimally invasive surgical approaches makes hybrid strategy an attractive alternative to conventional surgical or transcatheter techniques for any given set of cardiovascular diseases. In the areas of coronary revascularization, valve repair or replacement, and ablation for atrial fibrillation, hybrid approaches have shown great benefit especially in high-risk cases. With the technological evolutions in the treatment of cardiovascular disease, the Heart Team approach utilizing the expertise of all relevant specialties will be more and more invaluable in facilitating optimal patient selection, procedural planning, complication management, postprocedural care, and patient outcomes

Tips and Pitfalls in Robotic Mitral Valve Surgery

Robotic mitral valve repair is now routinely and safely performed all over the world. There are many literatures which showed advantages of reduced blood loss, lower risk of infection, lower risk of atrial fibrillation, shorter length of hospital stay, quicker return to normal activities, and a superior cosmetic result, compared with a conventional sternotomy. However, the introduction of new technique requires a learning curve even for expert mitral valve surgeons. There are complications specifically related to robotic mitral valve surgery, such as major vascular complications, inadequate myocardial protection, and unilateral pulmonary edema. The purpose of this chapter is to characterize the tips and pitfalls of robotic mitral valve repair and to discuss the controversial issues in the contemporary practice

The Choice of Graft Conduits in Coronary Artery Bypass Grafting

The use of the left internal mammary artery (IMA) has been shown to improve long-term survival and has been a gold standard in coronary artery bypass grafting (CABG). However, the choice of second or third graft conduit is still controversial. Multiple studies demonstrated the benefit of using multiple arterial grafts such as right IMA and radial artery in addition to left IMA in terms of long-term survival and graft patency. However, most of the centers still perform CABG with one IMA and vein grafts in a real world. The challenges for bilateral IMA utilization include longer operative time and concerns for higher rates of perioperative morbidity and mortality associated with increased sternal wound infection. Several studies reported that skeletonization technique can reduce the risk of sternal wound infection. Radial artery is another arterial conduit, which does not increase the risk of sternal wound infection and is easy to harvest. The superiority between radial artery and right IMA has been controversial. In the meantime, multiple trials have been made to improve the patency of vein grafts. The choice of graft conduits in CABG should be well considered preoperatively based on each patient’s backgrounds

Intraoperative Electroencephalography During Aortic Arch Surgery

Since its introduction, deep hypothermic circulatory arrest has been widely used for cerebral protection during aortic arch surgery. The use of electroencephalogram plays an important role in intraoperative neurophysiologic monitoring. Systemic cooling to the point of electrocerebral inactivity has been thought to ensure optimal neuroprotection from the ischemic injury during circulatory arrest. Therefore, electroencephalogram can guide surgeons to induce deep hypothermic circulatory arrest at an optimal timing. In the meantime, along with the advent of adjunctive cerebral perfusion techniques, there is a certain trend that circulatory arrest is induced at higher degrees than traditional deep hypothermic approach, called moderate hypothermic circulatory arrest. The role of electroencephalogram in this approach has not been well established yet, but some studies suggested the importance of intraoperative electroencephalogram in this approach as well. Electroencephalogram is also utilized in emerging operative techniques called hybrid arch repair. To conclude, intraoperative use of electroencephalogram can greatly contribute to cerebral protection in the field of aortic arch surgery, and surgeons should be familiar with its mechanism, indication, and interpretation