ABSTRACT
Lecithinized superoxide dismutase (L-SOD) has a higher affinity for cell membranes than recombinant human superoxide dismutase has. The purpose of this study, is to evaluate the protective effects of L-SOD against ischemia/reperfusion injury in blood-perfused isolated rat heart subjected to 30-min global normothermic ischemia. Fifteen isolated hearts were divided into three groups: group I (<i>n</i>=5), the untreated control group, group II (<i>n</i>=5) received 3, 000 units of L-SOD administered into the perfusion circuit at the beginning of reperfusion, and group III (<i>n</i>=5) received 3, 000 units of L-SOD administered into the perfusion circuit 10min after reperfusion. Left ventricular developed pressure, maximum positive and negative d<i>p</i>/d<i>t</i>, coronary vascular resistance and myocardial water content were assessed in each group. The percent recovery of left ventricular developed pressure in group II was significantly higher than that in group I and group III (77.4±11.1% in group II, 38.2±4.4% in group I, 40.2±4.1% in group III, <i>p</i><0.01). The percent recovery of maximum positive dp/dt in group II was significantly higher than that in group I and group III (70.0±11.2% in group II, 41.8±7.8% in group I, 38.0±5.7% in group III, <i>p</i><0.01). The percent recovery of maximum negative d<i>p</i>/d<i>t</i> in group II was also significantly higher than that in group I and group III (74.9±11.0% in group II, 41.3±8.0% in group I, 46.3±5.9% in group III, <i>p</i><0.01).There was no significant difference of coronary vascular resistance or myocardial water content among the three groups. These results suggest that L-SOD administered at the time of reperfusion has protective effects against ischemia/reperfusion injury in the isolated rat heart.
ABSTRACT
We evaluated the efficacy of combined antegrade and retrograde intermittent cold cardioplegia for patients with prolonged aortic cross-clamping. Thirty patients with cross-clamping time of more than 4h were divided into three groups according to the method of cardioplegia. Antegrade crystalloid cardioplegia was performed in 9 cases, combined antegrade and retrograde crystalloid cardioplegia was performed in 5 cases, and combined antegrade and retrograde cold blood cardioplegia was performed in 16 cases. There was no statistical difference in mean aortic cross-clamping time among the three groups. The hospital mortality was 33% in the antegrade crystalloid group, 20% in the combined crystalloid group, and 0% in the combined blood group. There was a significant statistical difference in the hospital mortality between the antegrade crystalloid and combined blood group. The incidence of low cardiac output syndrome (LOS) was 67% in the antegrade crystalloid group, 20% in the combined crystalloid group, and 6% in the combined blood group. There was a significant difference in the incidence of LOS between antegrade crystalloid and combined blood groups. The recovery rate of spontaneous rhythm after the release of the cross-clamp was also significantly greater in the combined blood group than in the antegrade crystalloid group. In conclusion, combined antegrade and retrograde intermittent cold cardioplegia provides excellent myocardial protection for patients with prolonged aortic cross-clamping.
ABSTRACT
A 63-year-old woman who was diagnosed a having impending rupture of abdominal aortic aneurysm underwent urgent anatomic reconstruction. Histopathological findings revealed abscess formation around the aneurysmal wall, and a definitive diagnosis of mycotic aneurysm was established. Successful management of this rare aortic disease depends on early accurate diagnosis, control of infection and careful surgical management.
ABSTRACT
A 64-year-old man with arteriosclerosis obliterans with huge multiple ulcers of the left leg was admitted for surgery. He had ichthyosis, and was diagnosed as X-linked ichthyosis by reduced steroid sulfatase activity and clinical examinations. Angiography revealed occlusions of the left common and external iliac arteries, left femoral artery, and right femoral artery. Aorto-left femoral bypass with a gelatin impregnated Dacron prosthesis and left femoro-popliteal bypass with a reversed saphenous vein graft were performed. Postoperatively the leg ulcers gradually healed and the patient was discharged in good condition. Leg ulcers with arteriosclerosis obliterans in patient with X-linked ichthyosis should be treated by the arterial reconstruction in the same way as in case with normal skin.
ABSTRACT
A rare case of left coronary ostial stenosis following aortic valve replacement (AVR) was reported. A 67-year-old man had undergone AVR for aortic stenosis and regurgitation. During the procedure basket tip cannula was utilized for selective coronary perfusion. He began to complain of chest pain 4 months after surgery, and coronary arteriography revealed a 99% stenosis at the left coronary ostium. Emergency coronary artery bypass grafting (CABG) to the LAD using a saphenous vein graft was successfully performed. The angina pectoris developing after AVR suggests that coronary ostial injury was caused by selective coronary perfusion cannula. The disease progresses rapidly in the absence of sufficient collaterals, and emergency CABG is needed to prevent critical myocardial infarction and sudden death.