ABSTRACT
<p><b>Background</b> : There has been no ideal valve prosthesis for children from the point of view of thromboembolism and size mismatch, and the surgical repair of native mitral valve has always been our first priority in children. However, valve replacement becomes the inevitable surgical option if repair is impossible. The purpose of this study was to assess the long-term results of mitral valvuloplasty (MVP) and mitral valve replacement (MVR) for isolated mitral valve diseases in children under 15 years old. <b>Patients and Methods</b> : From 1981 to 2010, 30 patients underwent a total of MVPs (P group) and 26 consecutive patients underwent a total of MVRs (R group). The median age was 4.6 years (4 months to 16 years) in group P and 6.2 years (4 months to 13.7 years) in group R, and the median body weight was 13.4 kg (6 to 35.5 kg) in group P and 16.4 kg (4.8 to 50.7 kg) in group R. The etiology was congenital in 55 (98%) patients, and due to endocarditis in 1 (2%) patient. Isolated mitral regurgitation was present in 41 (73%) patients (group iMR), and isolated mitral stenosis was present in 15 (27%) patients (group iMS). Mechanical valves (bileaflet disc, <i>n</i>=26) were used in all initial MVR patients. <b>Results</b> : Overall hospital mortality was 0%. The median follow-up time was 9.3±7.8 years (4 months to 27.7 years). There were 6 reoperations in P group and 5 explants due to size mismatch in R group with patient growth, and no explant due to structural valve deterioration. Survival rates at 10 years were 100% in the P group and 88.0% in the R group, and there was a significant difference (<i>p</i>=0.043). Freedom from reoperation at 10 years was 77.6% in P group and 77.0% in R group. Freedom rate from cerebral events at 10 years were 100% in both groups, respectively, and there were no significant differences. Survival rates at 10 years were 100% in the iMR group and 53.3% in the iMS group, respectively, and there was a significant difference between the groups (<i>p</i><0.001). Freedom rates from reoperation at 10 years were 77.1% in the iMR group and 64.3% in the iMS group, respectively, there being no significant difference. Conclusions : The long-term results of pediatric mitral surgery were acceptable. Mitral valvuloplasty for patients with isolated mitral regurgitation were excellent. Mitral valve replacement can be performed with low initial mortality but should be reserved for medical and reconstruction failure because reoperation and late mortality are high, particularly for patients with isolated mitral stenosis.</p>
ABSTRACT
<b>Background</b> : The improvement in surgical results for congenital heart disease has resulted in an increase in the number of adult congenital heart disease (ACHD) cases. Some ACHD patients are known to develop thoracic aortic aneurysm (TAA) at a young age, so we examined TAA in ACHD patients presenting at our institute over a 10-year interval. <b>Methods</b> : From 2002 to 2011, we performed 32 cases of surgery for TAA in ACHD patients. We excluded 5 cases of adult bicuspid aortic valve, 2 of TAA with untreated congenital heart disease (CHD), 1 of Marfan syndrome with CHD, and 9 of coarctation of the aorta (CoA) repair for the same site ; 15 patients were included. <b>Results</b> : The male/female ratio was 13/2, and the age of reoperation was 33.3±10.8 years. The 15 ACHD patients included 5 cases of the tetralogy of Fallot (TOF), 4 of congenital aortic stenosis (AS), 3 of ventricular septal defect (VSD), and 1 of each CoA complex, polysplenia/double outlet right ventricle (DORV), and polysplenia/corrected transposition of the great arteries (cTGA). Twelve cases of root dilatation and 2 of ascending aortic aneurysm were observed and 10 cases were concomitant with moderate to severe aortic regurgitation. Thirteen cases underwent elective surgery and the other two cases were emergency surgeries : a Bentall procedure for type 2 acute aortic dissection of polysplenia/DORV, and a Bentall and right ventricular outflow reconstruction (RVOTR) for ascending aorta/right ventricle rupture due to Konno patch detachment in congenital AS. The 13 elective cases included 11 cases of Bentall procedure, 1 of ascending aorta/hemi arch replacement, and 1 of ascending aorta replacement. Concomitant procedures were 1 case of aortic valve replacement, 1 of mitral valve replacement, 1 of subaortic stenosis release, and 2 of RVOTR. Operation time was 572.8+/-101.4 min, cardiopulmonary bypass time was 295.8+/-100.2 min, and aorta clamp time was 188.1+/-58.8 min. One hospital death was observed in 1 emergency case due to methicillin-resistant <i>Staphylococcus aureus</i> (MRSA) sepsis, but no 30-day mortality was observed. Intensive care unit (ICU) stay was 9.4+/-10.1 days and hospital stay was 34.4+/-18.2 days. <b>Conclusion</b> : The most common ACHD found during TAA surgery in our institute was Tetralogy of Fallot. ACHD had various complications and restrictions for surgery but TAA surgery in ACHD patients was safe and feasible.
ABSTRACT
<b>Introduction</b> : We report the effect of adaptive servo ventilation (ASV) treatment on heart failure in a home care setting.<br><b>Methods</b> : For eight home care patients aged ≥75 with heart failure, we diagnosed sleep-disordered breathing (SDB) by using a simplified monitor and implemented ASV treatment. We assessed its effect on heart failure by using NT-proBNP. We also assessed its effects on SDB by using apnea hypopnea index (AHI).<br><b>Results</b> : Three patients dropped out because they felt fear of putting on the mask. Among the other five patients, we observed a significant decrease rate of NT-proBNP (mean : -0.43, 95% confidence interval (CI) : -0.64, -0.22) after the ASV treatment. With regard to AHI, we observed a decreasing tendency (mean : -20.4 /hour, 95% CI : -41.2/hour, 0.4/hour).<br><b>Conclusion</b> : This study suggests that ASV treatment is effective for a treatment of heart failure in a home care setting.
ABSTRACT
Risk analysis models are becoming more important in various aspects of the clinical setting. We have used the logistic EuroSCORE as a risk analysis model, but there is divergence between the model and actual clinical reality in our country. The Japan Score is a risk model based on the Japan Adult Cardiovascular Surgery Database and it is considered to be better reflect from Japanese clinical results. We compared the logistic EuroScore (ES) and Japan Score (JS) and their predictive accuracy, using our clinical results. Between October 2006 and June 2011, 733 operations suitable for evaluation by the Japan Score were performed at our institute. Isolated coronary artery bypass grafting (CABG) was performed in 151 cases, valve surgery (Valve) in 346 cases and aortic surgery (Aorta) in 236 cases. In these cases we calculated 30-day mortality using the EuroSCORE and JapanSCORE and compared the results and prediction accuracy, by calculating the receiver operating characteristic curve (ROC curve) and the area under the ROC curve (AUC). We also calculated 30-day mortality and morbidity by the JapanSCORE and analyzed it by the same method. In the entire group, logistic 30-day mortality by ES and JS was 7.28 and 4.05% respectively. The AUC was 0.740 and 0.806, while 30-day mortality and morbidity calculated by JS was 17.72% and the AUC was 0.646. In the CABG group the 30-day mortality by ES and JS was 5.7 and 3.18% respectively, the AUC was 0.636 and 0.770, the 30-day mortality and morbidity was 13.37% and the AUC was 0.631. In the Valve group 30-day mortality by ES and JS was 6.00 and 3.79% respectively. The AUC was 0.715 and 0.794, 30-day mortality and morbidity was 17.54% and the AUC was 0.606. In the Aorta group 30-day mortality was 10.17 and 4.99% respectively. The AUC was 0.720 and 0.827. The 30-day mortality and morbidity was 20.83% and the AUC was 0.640. The 30-day mortality calculated by JS was significantly lower than that of ES (<i>p</i><0.001). The prediction accuracy of both of the ES and the JS was satisfactory but the prediction accuracy of JS was better than that of the ES. The prediction accuracy of the logistic 30-day mortality and morbidity were not as accurate as 30-day mortality. JS was a good risk analysis model not only for prediction of surgical results but also for improving surgical outcome.
ABSTRACT
Stentless bioprosthetic valves have been implanted for treatment of aortic valve disease, especially in elderly patients ; these valves have the advantage of durability and excellent hemodynamics compared with stented bioprosthetic valves. Although good long-term results in patients with stentless bioprosthetic valves have been reported recently, reoperation has been gradually increasing. We performed reoperation for the SJM Toronto SPV and Medtronic Freestyle valves in one patient each. The SJM Toronto SPV was used in a 30-year-old woman ; however, 8 years later, the valve showed severe calcification and adhesions, and could not be completely removed (Case 1). The other reoperation case, wherein a 69-year-old man underwent aortic valve replacement with the Medtronic Freestyle 4 years previously, showed no adhesion around the implanted valve, which could be easily removed from the autologous aortic annulus. Consequently, the first patient required reimplantation of a small mechanical valve (SJM #19). In contrast, we were able to use a stentless bioprosthetic valve (Prima Plus #23) for the second patient. Further observations on stentless bioprosthetic valves are required.
ABSTRACT
The use of the internal mammary artery (IMA) is now routine in most coronary artery bypass grafting (CABG) because of its improved long-term patency and survival. A small but important percentage of these patients will require valve surgery and thoracic aortic aneurysm repair following CABG. These operations present a challenging problem for the cardiac surgeon because of difficulties regarding approach, dissection around the IMA and optimal myocardial protection. We investigated surgical results and the effectiveness of various methods of myocardial protection in 8 patients who underwent reoperations between December 1983 and June 2005. The mortality was 13%. There were 2 perioperative myocardial infarctions (25%), 6 cases of prolonged ventilation (75%), 3 cases of low output syndrome (38%), 1 case of acute renal failure (13%) and 1 case of sepsis (13%). We carried out resternotomy for 6 patients without any hospital death or perioperative myocardial infarction. Our reoperation approach had acceptable risk control with resternotomy, avoidance of dissecting the IMA and hypothermic perfusion.
ABSTRACT
A 71-year-old man was given a diagnosis of saccular aneurysm of the aortic arch (maximum 48mm in diameter) at the age of 68. When he was 69 years old, he began to take steroids for autoimmune hepatitis (AIH). The following year, the aneurysm was enlarged to 52mm. Further examinations showed the aneurysm to extend to the ostium of the left subclavian artery. Since he had transient ischemic attacks, ultrasonography of the carotid arteries was performed. Bilateral internal carotid stenoses were detected, however, cold Xe CT showed an almost normal pattern of cerebral blood flow. We decided that operation was feasible using retrograde cerebral perfusion (RCP). Liver dysfunction due to AIH improved, and his steroid dosage was tapered. Using RCP, the no-touch technique and the elephant trunk procedure, he underwent the replacement of ascending aorta and aortic arch and was discharged without major complications. RCP and the no-touch technique might enable safer operations on patients with carotid stenoses.