[Selective Sinus Replacement for Aortic Root Disease].

BACKGROUND: Selective sinus replacement seems a reasonable option in cases requiring replacement of one or two sinuses of Valsalva, especially with acute aortic dissection and high bleeding risk. METHODS: Six patients (average age 58±17 years;five males) underwent selective replacement of the right sinus of Valsalva with right coronary artery bypass grafting (n=5) in 2015-2023. Five patients developed acute aortic dissection and one developed aneurysm of the right sinus of Valsalva. RESULTS: All patients survived the operation, and there were no cases requiring re-exploration for bleeding. Intraoperative transesophageal echocardiography showed trivial or less aortic regurgitation (AR) in all patients. Cardiopulmonary bypass time, aortic cross-clamping time, and lower body circulatory arrest time were 214±28 min, 159±22 min, and 31±6 min (n=5), respectively. During follow-up of 55±44 (4-104) months, all patients were asymptomatic. AR was mild or less in four patients, mild-moderate in one patient, and severe in one patient. All patients had normal cardiac function without left ventricular enlargement, and so no reoperation was required. CONCLUSIONS: Although this method appears to be relatively safe and effective, some patients developed late AR. Long-term follow-up of larger numbers of patients will be necessary to confirm its effectiveness.

[Clinical Considerations in the Surgical Management of Active Infective Endocarditis of the Mitral Valve].

In the surgical management of infective endocarditis (IE), the presence of circulatory failure from valve destruction and vegetation embolization are important factors in determining the timing of surgery. Emergency surgery carries certain risks, such as infection control problems due to the unknown portal of entry of bacteria and infection, and the possibility of worsening cerebral hemorrhage in patients with hemorrhagic cerebrovascular disease. In recent years, there has been a trend toward more aggressive attempts at mitral valve repair for mitral IE, with improved success rates and rates of recurrent mitral regurgitation, and some reports suggesting that valve repair for active IE has better longterm survival rates than valve replacement. One possible factor is that early surgical intervention to resect the lesion may have a significant impact on the cure rate by preventing progression of valve destruction and controlling infection. Based on our clinical experience, we discuss the optimal timing of surgical intervention for mitral valve IE and present the postoperative remote survival rate, avoidance rate of reinfection, and avoidance rate of reoperation.

Two-Year Results of the 17-mm Avalus Aortic Valve in the PERIGON Japan Trial.

BACKGROUND: The PERIcardial SurGical AOrtic Valve ReplacemeNt (PERIGON) Japan Trial was developed to assess the safety and effectiveness of the 17-mm Avalus bioprosthesis (Medtronic, Minneapolis, MN, USA) in patients undergoing surgical aortic valve replacement.Methods and Results:The primary endpoint in the trial was the percentage of patients achieving the composite of at least 1 class improvement in New York Heart Association (NYHA) functional class at 1 year compared with baseline and effective orifice area index (EOAI) of 0.6 cm2/m2or greater at 1-year after implantation, compared with a performance goal of 60%. The present study reports outcomes through 2 years. Eleven patients were implanted (10 [91%] female, median age 78.3 years). From baseline to 1 year, 10 subjects (91%) showed an improvement in NYHA classification. At 1 year, mean (±SD) EOAI was 0.82±0.17 cm2/m2, with 10 patients (91%) having an EOAI ≥0.6 cm2/m2. As such, 9 of 11 patients (82%) successfully met the primary endpoint. One death occurred between the 1- and 2-year follow-up visits, unrelated to the valve. There were no valve reinterventions, explants, or device deficiencies through 2 years. CONCLUSIONS: The PERIGON Japan Trial met its primary endpoint. Surgical implantation of the 17-mm Avalus aortic bioprosthesis can be performed with an acceptable incidence of device-related adverse events, and the valve performs effectively based on echocardiographic findings.

[Asymptomatic Congenital Left Ventricular Aneurysm Treated with Endocardial Linear Infarct Exclusion Technique( ELIET):Report of a Case].

Surgical repair of asymptomatic congenital left ventricular aneurysm is poorly reported. A 30-yearold man presented with an asymptomatic abnormal electrocardiogram. Computed tomography (CT) and angiography revealed a congenital left ventricular aneurysm, and surgical repair was conducted with endocardial linear infarct exclusion technique (ELIET). His postoperative course was uneventful. Postoperative CT showed an elliptical cardiac shape with no recurrence of aneurysm. ELIET would serve as a surgical procedure for congenital left ventricular aneurysm.

A novel 'two-window' technique to facilitate totally 3D-endoscopic mitral valve repair.

We describe our experience of a novel 'two-window' technique designed to assist in totally 3D-endoscopic mitral valve repair. A 10-mm trocar for a 3D-endoscope was inserted through the 4th intercostal space in the mid-axillary line. A main small incision (3 cm, 4th intercostal space) without rib spreading, and a second 1 cm incision (1-2 intercostal spaces above,) were made in the anterior axillary line. Soft tissue retractors were applied on both ports. A left atrial retractor, a left ventricular vent, and right-hand instruments were inserted through the main working port. A flexible aortic cross-clamp, an antegrade cardioplegia line, and left-hand instruments were inserted through the second port. Our two-window technique is safe, effective, and reproducible for totally endoscopic mitral valve repair.

[Septal Myectomy for Obstructive Hypertrophic Cardiomyopathy Due to Noonan Syndrome;Report of a Case].

A 15-year-old boy with Noonan syndrome, who had been diagnosed with hypertrophic cardiomyopathy (HCM) at 4 and treated by drugs, was referred to our hospital because of progression of left ventricular outflow tract obstruction (LVOTO). Transthoracic echocardiogram (TTE) revealed left ventricular hypertrophy( LVH), LVOTO( systolic gradient:102 mmHg), and systolic anterior motion of the mitral valve( SAM) with mild mitral regurgitation(MR). We performed septal myectomy by transaortic and transapical approaches. Postoperative TTE revealed significant reduction in left ventricular outflow tract (LVOT) gradient (9 mmHg), resolution of SAM, and reduction in MR grade. The postoperative course was uneventful except for transient atrial tachyarrhythmia. Myectomy for HCM in a patient with Noonan syndrome is rare. This case suggests that myectomy is useful for the patients with Noonan syndrome.

Single patch technique for aortic annulus reconstruction in prosthetic valve endocarditis.

Aortic root reconstruction during aortic root replacement for a patient with prosthetic valve endocarditis and aortic root abscess can be a difficult procedure with many possible complications. In this video case report, we describe our novel technique using a single bovine pericardial patch that avoids deep stitches or external sutures to support the friable annulus. Compared with more standard methods, this approach has shorter cross-clamp and cardiopulmonary bypass times and is less demanding technically.

Long-term follow-up of repair-like replacement of mitral valve using autologous pericardium.

Objectives: The present study assessed the late results of the operation, which consisted of the construction of a stentless mitral valve using autologous pericardium and valve implantation. Methods: Between 2011 and 2018, among 1617 consecutive patients who underwent mitral valve operation at our institution, 15 adult patients (0.9%) with unrepairable mitral valves who wished to avoid conventional mitral valve replacement underwent this operation. Ten patients (67%) had a history of valve repair. After discharge, patients were prospectively followed-up with a echocardiographic evaluation up to the end point. The mean follow-up term was 70.8 ± 42.5 months. Results: There were no hospital deaths or thromboembolic events and only 1 late noncardiac death. Intraoperative transesophageal echocardiography of all patients revealed no or trivial mitral regurgitation. Eight patients (53.3%) underwent redo valve replacement within 12 years. Except 1 late death, the postoperative course was divided into 3 groups depending on the occurrence of redo surgery, as follows: an early reoperation group (reoperation within 4 years; n = 4), a late reoperation group (reoperation after 4 years; n = 4), and a free from reoperation group (n = 6). The latest transthoracic echocardiographic examination performed 7.2 ± 2.9 years after the operation revealed the grade of mitral regurgitation to be none in 2 patients, mild in 2 patients, mild to moderate in 1 patients, and moderate in 1 patient in the free from reoperation group. Conclusions: Despite the high incidence of reoperation, Normo operation can be a viable option during valve replacement, especially for young patients.

Transmitral thrombectomy to treat a patient with Takotsubo cardiomyopathy.

A 68-year-old woman with a history of bipolar disorder was admitted to another hospital with a gastric ulcer. On admission, Takotsubo cardiomyopathy was suspected because her electrocardiogram was abnormal and the characteristic left ventricular wall motion was apparent. On hospital day 11, echocardiography revealed a thrombus in the apex of the left ventricle. She was transferred to our hospital and heparin treatment was commenced. On follow-up echocardiography, the left ventricular wall motion had normalized but thrombus mobility had increased. Thrombectomy was performed via a transmitral approach with endoscopic assistance. Endoscopy allowed excellent visualization of the intracardiac structure.

Total endoscopic repair of unroofed coronary sinus syndrome via right mini-thoracotomy.

Unroofed coronary sinus syndrome (URCS) is a rare congenital cardiac anomaly. Recently, cardiac surgery using a minimally invasive approach has become the preferred treatment, affording better cosmetic results and a more rapid post-operative recovery than the traditional method. We report the case of a 54-year-old male in whom partial URCS was treated via a totally endoscopic repair technique featuring right mini-thoracotomy.

Interrupted commissural band annuloplasty prevents mitral stenosis.

BACKGROUND: Mitral annuloplasty is an important component of the treatment of degenerative mitral valve disease. However, postoperative echocardiography reveals elevated mitral gradients in some patients. We developed a technique that we termed interrupted commissural band annuloplasty (iCBA), which does not shorten either the anterior or posterior annulus and is not associated with the development of a mitral gradient. We compared the echocardiographic characteristics of patients treated using this method versus Cosgrove ring (COS) placement, both at rest and during exercise. METHODS: ICBA features placement of three sutures in the commissures using two bands and shortens the commissural annular length by 60 %. We used this method to treat 63 patients and placed Cosgrove bands in 58. Of all patients, 48 who underwent iCBA and 34 with COSs passed the exercise echocardiographic test. RESULTS: The maximal transmitral pressures at rest in the iCBA and Cosgrove groups were 8.04 ± 0.74 and 11.30 ± 0.88 mmHg (P = 0.0029), respectively, and the mean transmitral pressures at rest were 2.46 ± 0.74 and 3.61 ± 0.32 mmHg (P = 0.0037), respectively. The maximal transmitral pressures during exercise were 11.79 ± 0.97 and 18.37 ± 1.16 mmHg (P < 0.0001), and the mean transmitral pressures during exercise were 4.95 ± 0.45 and 7.76 ± 0.53 mmHg (P < 0.0001). CONCLUSIONS: ICBA prevents postoperative mitral stenosis both at rest and importantly during exercise.

An improved isolation technique for shaggy brachiocephalic artery and aortic arch replacement.

A mobile plaque in the ascending and transverse aorta increases the risk of cerebral infarction during treatment of an arch aneurysm. A previous report described an isolation technique for replacing the ascending and transverse aorta with a mobile atheroma by selective hypothermic antegrade cerebral perfusion (Shiiya et al., Ann Thorac Surg 72:1401-1402, 2001). Here, we present an improved isolation technique for more severe conditions, such as shaggy aorta and shaggy brachiocephalic artery, in two patients. First, we anastomosed both axillae arteries with grafts and placed drainage cannulae in the superior and inferior venae cavae prior to filling the cardio-pulmonary bypass system with blood. Next, we cannulated the right common carotid artery and selective cerebral perfusion was started prior to cannulation and perfusion of the left common carotid artery. Systemic perfusion was then initiated through the axillae grafts. Both patients who underwent this procedure recovered without neurologic complications.

Controversy in mitral valve repair, resection or chordal replacement?

Mitral valve plasty has superseded valve replacement as the standard technique for treating degenerative mitral valve prolapse. Quadrangular resection is considered the gold standard for posterior leaflet prolapse. Chordal replacement was first developed to treat the anterior leaflet and subsequently became widely used for the posterior leaflet, after which a new version of posterior leaflet resection was developed that did not involve local annular plication. In the era of the mini-thoracotomy, the premeasured loop technique is simple to adopt and is as durable as quadrangular resection. However, there is controversy surrounding whether resection or chordal replacement is the optimal technique. The resection technique is curative because it removes the main pathologic lesion. The disadvantage of the resection is that it can be complicated and often requires advanced surgical skills. In contrast, chordal replacement is not pathologically curative because it leaves behind a redundant leaflet. However, the long-term results appear to be equivalent in many reports. Functionally, chordal replacement retains greater posterior leaflet motion with a lower trans-mitral pressure gradient than quadrangular resection. Moreover, chordal replacement is simple and yields uniform results. The optimal technique depends on whether the anterior leaflet or posterior leaflet is involved, the Barlow or non-Barlow disease state, and whether a mini-thoracotomy or standard sternotomy approach is used. For mitral valve repair, the most superior and reliable technique for the posterior leaflet is resection using the newer resection technique with a sternotomy approach, which requires a skilled surgeon.

Interrupted commissural band annuloplasty for degenerative mitral valve disease.

BACKGROUND: Mitral annuloplasty is useful for treating degenerative mitral valve disease. Although the incidence of complications is low, prosthetic ring-related complications can occur. Hemolysis and mitral stenosis are serious complications requiring reoperation. Limited use of prosthetic material could decrease the risk for complications. Commissural annuloplasty has been reported by Kay and Reed; their techniques involve suture plication. To prevent dehiscence, we selected short bands and compared the echocardiographic changes between this method and the Cosgrove ring. METHODS: Three sutures are placed in the commissures using two bands, which shortens the annular length by 60%. We performed this interrupted commissural band annuloplasty (iCBA) in 63 patients and used Cosgrove bands for 58 patients. RESULTS: Clinically, for iCBA and Cosgrove groups, respectively, hemolysis with mild mitral regurgitation occurred in 0 and 2 cases (p=0.084), and mitral stenosis due to pannus formation occurred in 0 and 1 case (p=0.224). There was a trend toward a lower ring-related complication rate in the iCBA group. On echocardiography, for the iCBA and Cosgrove groups, respectively, the maximum anterior-posterior distance of the annulus in diastole was 3.1±0.7 mm and 2.6±0.4 mm (p<0.001), maximum opening angle of the posterior leaflet was 85.7±17.3 degrees and 103.4±20.1 degrees (p<0.001), and coaptation distance was 11.6±3.7 mm and 8.4±2.6 mm (p<0.001). CONCLUSIONS: The iCBA method prevented posterior leaflet tethering, kept the coaptation distance deep on echocardiography, and was associated with lower trends of ring-related complications. Because the posterior side of the annulus was not reconstructed, iCBA is suitable for fibroelastic deficiency, rather than for Barlow's disease.