Thoracic Endovascular Aortic Repair Without Subclavian Revascularization of a Ruptured Kommerell Diverticulum.

A ruptured Kommerell diverticulum is extremely rare. This is the first report of thoracic endovascular aortic repair without subclavian revascularization of a ruptured Kommerell diverticulum with a right-sided aortic arch. However, decisions regarding subclavian revascularization should be individualized based on the patient's anatomy and clinical presentation.

Strategy for acute DeBakey type I aortic dissection considering midterm results: a retrospective cohort study comparing ascending aortic replacement and total arch replacement with frozen elephant trunk technique.

BACKGROUND: Acute type A aortic dissection is treated with an emergency procedure that uses ascending aortic replacement (AAR). However, to avoid a residual dissected aorta with a false lumen, total arch replacement (TAR) is required. The frozen elephant trunk (FET) technique is a promising surgical approach that promotes false lumen obliteration in a single step. Therefore, this retrospective single-center study aimed to evaluate the operative outcomes of AAR and TAR with FET. METHODS: Between 2007 and 2021, 143 patients with acute DeBakey type I aortic dissection underwent a central repair using AAR (n = 95) or TAR with FET (n = 43). All perioperative variables, the duration of all-cause mortality, and aortic events defined as dilatation of the distal aorta > 5 cm, new occurrences of aortic dissection, distal aortic surgery, and distal aortic rupture were recorded. We compared these perioperative variables and mid-term results with an additional focus on distal aortic events. RESULTS: Patient background data did not differ between the two groups. Perioperative results for the TAR with FET group vs the AAR group showed similar operative times (306 vs 298 min, P = 0.862), but the TAR group had longer cardiopulmonary bypass times (154 vs 179 min, P < 0.001). The freedom from all-cause death for the TAR vs AAR groups using the Kaplan-Meier method was 81.9% vs 85.4% and 78.0% vs 85.4% (P = 0.407) at 1 and 3 years, respectively. Freedom from aorta-related events was 90.6% vs 97.6% and 69.3% vs 87.0% (P = 0.034) at 1 and 3 years, respectively. CONCLUSIONS: TAR with FET had comparable perioperative results to AAR in acute DeBakey type I aortic dissection and was considered a valuable method to avoid aorta-related events in the midterm.

Concomitant surgery of minimally invasive direct coronary artery bypass with left atrium appendage closure.

Surgical approaches of minimally invasive direct coronary artery bypass and left atrial appendage exclusion are different, and issues may arise in cases of concomitant surgery. Moreover, the safety of concomitant procedures has not been established. A man in his 80s with a history of stroke required minimally invasive coronary artery bypass grafting and left atrial appendage closure for the stenosis of the left anterior descending artery and atrial fibrillation. He suffered from bladder bleeding, which required early reduction of anticoagulant and antiplatelet medication. Therefore, he wished for surgical treatment. A lateral incision was necessary for left atrial appendage closure in minimally invasive surgery. We performed totally endoscopic harvest of the internal thoracic artery without a robotic system. This method allowed the incision to be made more laterally. Combining the endoscopic harvest of the internal mammary artery with left atrial appendage closure via lateral incision may be a reasonable technique.

Facile formation of barium titanium oxyhydride on a titanium hydride surface as an ammonia synthesis catalyst.

Oxyhydrides are promising compounds as supports for ammonia synthesis catalysts because they suppress hydrogen poisoning on the catalyst surface and enhance the ammonia synthesis activity. Herein, we developed a facile method for preparing BaTiO2.5H0.5, a perovskite oxyhydride, on a TiH2 surface via the conventional wet impregnation method using TiH2 and Ba hydroxide. Scanning electron microscopy and high-angle annular dark-field scanning transmission electron microscopy observations revealed that BaTiO2.5H0.5 crystallized as nanoparticles of ca. 100-200 nm on the TiH2 surface. The Ru-loaded catalyst Ru/BaTiO2.5H0.5-TiH2 exhibited 2.46 times higher ammonia synthesis activity (3.05 mmol-NH3 g-1 h-1 at 400 °C) than the benchmark Ru catalyst Ru-Cs/MgO (1.24 mmol-NH3 g-1 h-1 at 400 °C) because of the suppression of hydrogen poisoning. The analysis of reaction orders showed that the effect of suppressing hydrogen poisoning on Ru/BaTiO2.5H0.5-TiH2 was equivalent to that of the reported Ru/BaTiO2.5H0.5 catalyst, thus supporting the formation of BaTiO2.5H0.5 perovskite oxyhydride. This study demonstrated that the selection of appropriate raw materials facilitates the formation of BaTiO2.5H0.5 oxyhydride nanoparticles on the TiH2 surface using the conventional synthesis method.

Case report: Unruptured small middle cerebral artery aneurysm with perianeurysmal edema.

Background: Perianeurysmal edema (PAE) has a tendency to occur in embolized aneurysms but also in partially thrombosed, large, or giant aneurysms. However, there are only a few cases recorded in which PAE was detected in untreated or small aneurysms. We suspected that PAE might be an impending sign of aneurysm rupture in these cases. Herein, we presented a unique case of PAE that was related to an unruptured small middle cerebral artery aneurysm. Case description: A 61-year-old woman was referred to our institute due to a newly formed abnormal fluid-attenuated inversion recovery (FLAIR) hyperintense lesion in the right medial temporal cortex. Upon admission, the patient did not present with any symptoms or complaints; however, FLAIR and CT angiography (CTA) suggested an increased risk of aneurysm rupture. Aneurysm clipping was conducted, and no evidence of subarachnoid hemorrhage and hemosiderin deposits around the aneurysm and brain parenchyma was noted. The patient was discharged home without any neurological symptoms. MRI taken at eight months post-clipping revealed complete regression of the FLAIR hyperintense lesion around the aneurysm. Conclusion: PAE in unruptured, small aneurysm is thought to be an impending sign of aneurysm rupture. Early surgical intervention is critical even for small aneurysms with PAE.

Revascularization for controlling hypertension and improving cardiorenal failure in Leriche syndrome.

Leriche syndrome usually occurs when atherosclerotic obstructions result in luminal narrowing of the abdominal aorta or iliac arteries and leads to thrombosis; it rarely causes heart or renal failure. We report the case of a 58-year-old Asian man with heart and renal failure as the dominant clinical manifestations of renovascular hypertension caused by Leriche syndrome. We performed an aorto-bifemoral bypass and unilateral renal artery stenting. Post-operative echocardiography showed improved cardiac function, with the left ventricular ejection fraction increasing from 30% before surgery to 54.2% after surgery. Moreover, his heart rate and blood pressure became stable, and his serum creatinine and brain natriuretic peptide levels decreased from 3.46 to 1.08 mg/dL and 685 to 4 pg/mL, respectively. Our case report shows that aorto-bifemoral bypass and unilateral renal artery stenting can effectively treat heart and renal failure resulting from renovascular hypertension caused by Leriche syndrome.

Enhanced ammonia synthesis activity of Ru-supported cerium-lanthanum oxide induced by Ti substitution forming mesopores.

Ru/Ce0.5La0.5-xTixO1.75+0.5x solid solutions with cubic fluorite structure were successfully synthesized via the polymerized complex method. While the Ti substitution enhanced Ce4+ reducibility by compensating for oxygen vacancies, the reducibility showed no correlation with ammonia synthesis activity. However, Ru/Ce0.5La0.4Ti0.1O1.8 showed the highest activity originating from the facilitated formation of mesopores.

Combination of endoscopic internal thoracic artery harvest and proximal anastomoses on the descending aorta in minimally invasive coronary artery bypass grafting.

Minimally invasive coronary artery bypass grafting is less invasive. Proximal anastomoses at the ascending aorta, in contrast, are technically difficult to perform because of the limited field of view. A man in his 60s undergoing haemodialysis required minimally invasive coronary artery bypass grafting for left anterior descending artery and circumflex arterial restenosis. We successfully performed minimally invasive coronary artery bypass grafting with a proximal graft anastomosis of the descending aorta. A thoracotomy was performed to extend the lateral approach to the descending aorta. We performed a minithoracotomy using three-dimensional endoscopy for internal thoracic artery harvesting. Endoscopic internal thoracic artery harvesting minimises incision length. The combination of endoscopic and lateral thoracotomy incisions in minimally invasive coronary artery bypass grafting enabled small and lateral thoracotomy incisions.

Image contrast assessment of metal-based nanoparticles as applications for image-guided radiation therapy.

Metal-based nanoparticles (NPs) have been extensively studied for dose enhancement applications in radiation therapy. This study investigated the utility of such NPs for image-guided radiation therapy (IGRT). Phantom images of gold NPs (AuNPs) and titanium peroxide NPs (TiOxNPs) with different concentrations were acquired using IGRT modalities, including cone-beam computed tomography (CBCT). AuNPs induced strong contrast enhancement in kV energy CBCT images, whereas TiOxNPs at high concentrations showed weak but detectable changes. The results indicated that these NPs can be used to enhance IGRT images as well as dose enhancement for treatment purposes.

Stent graft in abdominal aortic aneurysm collapsed suddenly after thoracic endovascular aortic repair.

Stent graft collapse due to aortic dissection is an extremely rare event. Although endovascular aneurysm repair (EVAR) and thoracic endovascular aortic repair (TEVAR) are increasingly being performed, various complications can occur. We report a case of collapse of a stent graft, which was used to repair an abdominal aortic aneurysm (AAA) after TEVAR for thoracic aortic aneurysm (TAA). A 72-year-old man with a 77 mm AAA and 60 mm TAA underwent EVAR and a TEVAR 2 months later, respectively. CT performed after the TEVAR showed thoracic aorta dissection with associated AAA stent graft collapse. The graft collapsed was due to superior mesenteric artery obstruction. An emergency TEVAR was performed, and the procedure improved the collapsed graft; however, the endoleak of the AAA stent graft persisted. The AAA expanded over several days, warranting an open repair. Our case provides an insight into the cautionary indications for endovascular therapy.

Late-onset total anomalous pulmonary venous connection in a 70-year-old woman.

Total anomalous pulmonary venous connection (TAPVC) is a rare congenital cardiac anomaly. There are a few reports of untreated TAPVC diagnosed in patients older than 60 years. Herein, we report the successful surgical treatment of TAPVC in a 70-year-old woman. A 70-year-old woman with TAPVC presented with symptoms of acute heart failure. We closed an atrial septal defect and performed tricuspid annuloplasty and commissurotomy of the pulmonary valve. Postoperative CT showed no residual shunt, and the pulmonary veins drained into the left atrium. She had an uneventful postoperative course. This report describes the case of the oldest known patient who underwent surgical treatment for TAPVC. Surviving into adulthood with little or no symptoms is uncommon in patients with TAPVC, and cases of late-onset TAPVC, such as our case, are rare. Nevertheless, close vigilance is necessary to prevent misdiagnosis in patients with this clinical presentation.

Mild Systemic Hypothermic Circulatory Arrest Using a Frozen Elephant Trunk Graft with Endo-Balloon Occlusion for Total Arch Replacement.

BACKGROUND: Stroke and paraplegia are serious complications of total aortic arch replacement (TAR). Hypothermic circulatory arrest and cerebral perfusion reduce the risk of neurologic complications, but longer circulatory arrest time remains a risk factor for such complications. We utilized a frozen elephant trunk (FET) with endo-balloon occlusion under mild systemic hypothermia, which allowed us to shorten circulatory arrest time. METHODS: Between April 2007 and May 2020, 72 patients underwent elective TAR using antegrade cerebral perfusion (ACP). They were divided into 2 groups. 64 patients received conventional TAR with moderate systemic hypothermic (bladder temperature, 25-28°C) circulatory arrest (group C). We used a FET with endo-balloon occlusion and retrograde perfusion through the femoral artery for the newest 8 patients who had mild hypothermic (bladder temperature of 30°C) circulatory arrest (group B). RESULTS: The mean operation time (257.5 ± 42.1 versus 327.8 ± 84.9 min, P = .023), CPB time (144.4 ± 28.1 versus 178.2 ± 26.4 min, P = .003), cardiac arrest time (75.5 ± 21.2 versus 95.7 ± 56.4 min, P < .001), SCP time (100.8 ± 25.5 versus 124 ± 23.2 min, P < .001), lower body circulation arrest time (17.2 ± 4.2 versus 62.5 ± 19.3 min, P < .001) were significantly shorter in the endo-balloon occlusion group. There were no perioperative neurological and renal complications or mortality in FET group. The new technique enabled a decrease in mechanical ventilation time (8.6 ± 1.4 versus 13.9 ± 5.7 min, P = .015) and hospital length of stay (9.7 ± 1.8 versus 18.3 ± 4.6 min, P = .005). CONCLUSION: FET using an endo-balloon occlusion with mild hypothermia is a safe and an effective approach in TAR.

Hypo-attenuated leaflet thickening in surgically-implanted mitral bioprosthesis.

BACKGROUND: Hypo-attenuated leaflet thickening (HALT) in bioprosthetic aortic valve has been studied, but its equivalent in bioprosthetic mitral valve (bMV) remains uncharacterized. We sought to identify the prevalence, hemodynamic characteristics, and significance of anticoagulation therapy in bMV HALT. METHODS: A single-center cross-sectional study of 53 consecutive patients who underwent mitral valve replacement (MVR) with bMV between 2007 and 2017 was conducted. Cardiac-gated contrasted CT scans were obtained. Anticoagulant and antiplatelet therapy use were ascertained at the time of hospital discharge and CT scanning. Patient characteristics, postoperative stroke, and hemodynamic profile by echocardiogram were obtained to descriptively characterize the prevalence and characteristics associated with bMV HALT. RESULTS: Three patients (5.7%) were found to have a HALT on bMV. The mean time from index MVR to CT scan was 3.4 ± 0.8 years in HALT cohort and 3.4 ± 2.7 years in non-HALT cohort. Fifty patients (94.3%) were discharged on warfarin, and 37 patients (69.8%) were on warfarin at the time of CT scans. One patient with HALT was on therapeutic warfarin at the time of the CT scan that identified HALT. All three patients were asymptomatic at the time of CT scan. In patients with HALT, mean transmitral pressure gradient were 8, 5, and 2.7 mmHg, all with trivial or mild mitral regurgitation. CONCLUSIONS: In this study, the prevalence of HALT was low at 5.7%, all presenting without symptoms. One patient presented with HALT while on therapeutic oral anticoagulation, which may suggest thrombotic etiology may not adequately explain HALT.

A CAD-CAM approach for designing and fabricating a periodontal prosthesis: A clinical report.

The periodontal prosthesis is a successful retrievable fixed restoration provided for patients with a periodontally involved dentition who lack alternative fixed options. However, its popularity has declined due to the introduction of dental implants, as well as the cost and complexity of fabrication. Nonetheless, this remains a viable option for patients who cannot undergo implant surgery. This clinical report describes the use of computer-aided design and computer-aided manufacturing (CAD-CAM) technology to streamline the fabrication of a periodontal prosthesis.

Bilateral internal thoracic artery grafting: propensity analysis of the left internal thoracic artery versus the right internal thoracic artery as a bypass graft to the left anterior descending artery.

OBJECTIVES: To compare different configurations of the bilateral internal thoracic arteries for the left coronary system and examine early and late outcomes, including mid-term graft patency. METHODS: We reviewed 877 patients who underwent primary isolated coronary artery bypass grafting using in situ bilateral internal thoracic arteries [in situ right internal thoracic artery (RITA)-to-left anterior descending artery (LAD) grafting, n = 683; in situ left internal thoracic artery (LITA)-to-LAD grafting, n = 194]. We compared mid-term patency between the grafts. Propensity score matching was performed to investigate early and long-term outcomes. RESULTS: The 2-year patency rate for RITA-to-LAD and LITA-to-LAD grafts were similar. Multivariate analysis revealed that RITA-to-non-LAD anastomosis (P = 0.029), postoperative length of stay (P = 0.003) and chronic obstructive pulmonary disease (P = 0.005) were associated with graft failure. After statistical adjustment, 176 propensity-matched pairs were available for comparison. RITA-to-LAD grafting enabled a more distal anastomosis. Kaplan-Meier analysis revealed that the incidences of death, repeat revascularization and myocardial infarction were significantly higher in the LITA-to-LAD group among both the unmatched and matched samples (P = 0.045 and 0.029, respectively). CONCLUSIONS: The mid-term patency and outcomes of RITA-to-LAD grafting are good and reduces future cardiac event, in contrast to LITA-to-LAD grafting.

Relapse of aortopulmonary window 41 years after patch closure.

In this study, we describe a rare case of a 45-year-old man with a recurrence of aortopulmonary window (APW) 41 years after the initial patch closure for an APW at the age of 4. He presented with persistent cough and exertional dyspnoea. Imagings revealed a recurrence of APW, ascending aorta saccular aneurysm, and severe mitral and tricuspid regurgitation. Re-patch closure, ascending aortic replacement, and mitral and tricuspid annuloplasties were performed, followed by an uneventful postoperative course. The relapse of APW in the remote postoperative period is extremely rare.

Trichophyton tonsurans-induced kerion celsi with decreased defensin expression and paradoxically increased interleukin-17A production.

We report a case of kerion celsi due to Trichophyton tonsurans. An 18-year-old male student judo practitioner had alopecic patches, black dots and subcutaneous abscesses on the right temporal region. The damaged hair represented endothrix infection with T. tonsurans, as assessed by mycological examinations. He was treated with oral itraconazole without any therapeutic effect, followed by terbinafine with good effect. A skin biopsy showed neutrophil, lymphocyte and histiocyte infiltration into the dermis and subcutaneous tissue with abscesses around a number of dilated hair follicles. Immunostaining showed that the expression level of human ß-defensin 2 (HBD-2) was decreased in the epidermis of the alopecic and adjacent skin. Because interleukin (IL)-17A generally induces HBD-2 production by epidermal keratinocytes, we also immunohistochemically investigated IL-17A expression. Unexpectedly, many IL-17A-bearing cells were found around destructed hair follicles, indicating that IL-17A expression was not attenuated, but rather increased in the skin lesion. Our case suggests that IL-17A-upregulated antimicrobial peptide expression is disordered in kerion celsi, and severe inflammation with IL-17A may cause tissue damage and resultant scar.