Fourteen patients (mean age 17.2 years, range 2 to 39 years) undergoing right ventricular outflow tract reconstruction for a Ross operation were studied between 1998 and 2000. Ten of 14 patients underwent Ross procedures and 4 received Ross-Konno procedures. Echocardiographic examination of the pulmonary homograf t was performed after surgery. The mean follow-up period was 23.1 months, ranging from 14 to 33 months. Mean peak velocity and peak gradient were 1.6±0.4m/s and 11.9±5.2mmHg, respectively. Three patients in whom echocardiography revealed a peak pulmonary gradient of 20mmHg or more were retrospectively analyzed with each catheterization data. All patients had no more than 10mmHg at the distal end of the homograft with no evidence of deformity or shrinkage. Only one patient had a trivial homograft valve regurgitation, however, no patient had more than mild pulmonary regurgitation. Patient age, donor age, and preservation period did not reveal any significant risk factor for homograft stenosis. Pulmonary homograft appears to be an excellent substitute for right ventricular outflow tract reconstruction during the mid-term postoperative period.

A 53-year-old man presented with a painful, non-healing ischemic ulcer of the left fifth toe. The patient was initially treated conservatively for 4 months with local debridement and medication with antiplatelet therapy but his symptoms and the ulcer was refractory. A computed tomography revealed a bulky, irregular, gritty, localized calcification of the infra-renal aorta and was compatible with the so-called “coral reef aorta”. Angiography confirmed the findings of the CT scan, and there was no evidence of occlusive lesions in the distal runoff vessels. A diagnosis of blue toe syndrome secondary to infra-renal coral reef aorta was made. In order to prevent further embolization, the patient underwent aortic excision with PTFE grafting via a retroperitoneal incision. In order to increase the microcirculation of the toe and to aid in the healing of the ulcer, a lumbar sympathectomy was performed simultaneously. The ulcer healed completely on postoperative day 47. The treatment method for coral reef aorta depends on the presence or absence of global ischemia of the lower extremity and embolic complications.

Renal damage caused by hemolysis during cardiopulmonary bypass (CPB) was investigated, and the preventive effects of haptoglobin in regard to this condition was also evaluated. Nineteen patients who underwent open heart surgery were divided into two groups: a control group (n=11) and a haptoglobin group (n=8). In the control group, the level of plasma-free hemoglobin increased significantly after CPB (p<0.01), and this level was strongly correlated with renal tubular leaking enzymes: NAG (r=0.76) and γ-GTP (r=0.81), in the Intensive Care Unit or on the first day after surgery. On the contrary, in the haptoglobin group, in which 4, 000 units of haptoglobin was added in the priming solution of CPB, no increased level of plasma free hemoglobin was observed. Furthermore, leak age of renal tubular enzymes were statistically less (p<0.05). It was concluded that free hemoglobin was a cause of renal damage during CPB and the damage was preventable by the administration of haptoglobin.

A 3-year-old girl was given a diagnosis of coronary arteriovenous fistula associated with a single right coronary artery on cardiac catheterization. The left coronary artery arose from the proximal part of the right coronary artery. The dilated left coronary artery ran in front of the right ventricular outflow tract and then divided into the left anterior descending branch and the left circumflex artery. A coronary arteriovenous fistula was in the left main coronary artery and opened into the right ventricular outflow tract. Under cardiopulmonary bypass and cardiac arrest, a transverse incision was made at the right ventricular outflow tract 1cm below the dilated vessel and the 5-mm oval-shaped orifice of the fistula was identified. This fistula was closed with a pledgetted mattress suture reinforced with over-and-over suture. Catheterization 8 months after surgery demonstrated no residual shunt and she has been doing well.

A check of the health of residents in their twenties and thirties in Nagano Prefecture's rural communities indicates that the rate of hypertensives and the incidence of cholesterolemia were low in those age groups. There were signs that the prevalence of obesity is somewhat high among males but low among females. Virtually no incidence of anemia was observed among men but the incidence was fairly high among women. The number of persons with hepatic dysfunction was relatively large among men. In terms of the intake of nutrients, there were not a few men for whom the meals were imbalanced, and the intake of alcoholic beverages was high.
It is necessary that women should refrain from taking in confectionary and taken in fishmeat, meat, milk, egg, soybeans and other proteins. In Nagano Prefecture's rural communities, there remain signs that the intake of salt is high even in young generation, so that it is important to take measures for the prevention of hypertension.