BACKGROUND: Reactive oxygen free radicals have been implicated as an important factor in the development of ischemia-reperfusion injury of heart. Captopril, a SH-containing angiotensin converting enzyme(ACE) inhibitor has been reported to provide the protective effect in different models of myocardial ischemia and reperfusion injury of animal hearts. It is postulated that the myocardial protective effect may be related to a potential anti-free radical effect independent of ACE inhibition. The present study was designed to elucidate the myocardial protective mechanism of Captopril by investigating the drug effect on the experimentally induced oxygen free radical-mediated myocardial injury in isolated hearts of rats. METHODS: The heart isolated from rat was perfused retrogradly by Langendorff method. Myocardial dysfuntion was induced by oxygen free radicals generated by electrolysis of the perfusing solution(Kreb-Henseleit) with 2mA direct current for 45 sec. The cardiac functions(left ventricular pressure, dP/dt, heart rate, coronary flow) and the ventricular content of a lipid peroxidation product, malondialdehyde(MDA) were measured under presence of absence of Captopril and the compairing drugs(enalaprilat, cysteine and dithiothreitol). RESULTS: Electrolysis of oxygen-saturated Krebs-Henseleit perfusing solution led to the production of superoxide anion increasingly with intensity and duration of the applied electric current. The hearts perfused with the electroyzed solution demonstrated significant decrease in left ventricular pressure, dp/dt, heart rate, coronary folw and increase in myocardial MDA content. The depression of myocardial function as well as the increase of MDA content and oxygen radical production were reversed by Captopril(0.75~2mM) dose-dependently. Enalaprilat, a non-SH containing ACE inhibitor, however, showed no protective effect at all. Cysteine and dithiothreitol, the SH-containing agents without ACE inhibitory action showed also protective effects on the myocardial depression induced by electrolysis. CONCLUSION: It is suggested that Captopril may exert protective effect on oxygen radical-mediaed myocardial injury probably by its antioxidative and anti-free radical mechanism related to SH-group.
Angiotensins ; Animals ; Captopril* ; Cysteine ; Depression ; Dithiothreitol ; Electrolysis ; Enalaprilat ; Free Radicals ; Heart ; Heart Rate ; Lipid Peroxidation ; Myocardial Ischemia ; Oxygen ; Rats ; Reperfusion Injury ; Superoxides ; Ventricular Pressure

PURPOSE: To evaluate normal variations and thus to avoid confusion in differentiation from lesions of the accessory structures (rhomboid fossa, foramen for supraclavicular nerve, conold tubercle) of the clavicle in chest radiographs. MATERIALS AND METHODS: We studied the variations of the clavicle in 300 chest radiographs (134 men, 166 women) and 355 dry bones (right 166, left 189; 151 men, 74 women, 130 unknown sex). RESULTS: In chest radiographs, the incidence of the depressed rhomboid fossa was 229 cases (39.5%;male 52.0%, female 29.9%);the flat type was 329 cases (56.9%;male 45.7%, female 65.7%);and the elevated type was 20 cases (3.5%; male 2.4%, female 4.3%). In the dry bones, the incidence of the depressed thombold fossa was 129 cases (57.3%;male 59.6%, female 52.7%);the flat type was 65 cases (28.9%;male 24.5%, female 37. 8%) ;and the elevated type was 31 cases (13.8%;male 15.9%, female 9.5%). The incidence of the foramen for supraclavicular nerve was 0.8% in chest radiographs, and 1.4% in the dry bones. The incidence of the elevated conold tubercle was 65.1% (male 64.0%, female 65.9%) in chest radiographs, and 96.9% (male 95.4%, female 100.0%) in the dry bones. CONCLUSIONS: The incidence of the depressed rhomboid fossa in chest radiographs was higher in men and the right clavicle. The incidence of flat rhombo~d fossa in chest radiographs decreased according to increase of age. The foramen for supraclavicular nerve was occasionally found (0.8% in chest radiographs; 1.4% in the dry bones).
Clavicle* ; Female ; Humans ; Incidence ; Male ; Radiography, Thoracic* ; Thorax*

PURPOSE: To evaluate normal variations and thus to avoid confusion in differentiation from lesions of the accessory structures (rhomboid fossa, foramen for supraclavicular nerve, conold tubercle) of the clavicle in chest radiographs. MATERIALS AND METHODS: We studied the variations of the clavicle in 300 chest radiographs (134 men, 166 women) and 355 dry bones (right 166, left 189; 151 men, 74 women, 130 unknown sex). RESULTS: In chest radiographs, the incidence of the depressed rhomboid fossa was 229 cases (39.5%;male 52.0%, female 29.9%);the flat type was 329 cases (56.9%;male 45.7%, female 65.7%);and the elevated type was 20 cases (3.5%; male 2.4%, female 4.3%). In the dry bones, the incidence of the depressed thombold fossa was 129 cases (57.3%;male 59.6%, female 52.7%);the flat type was 65 cases (28.9%;male 24.5%, female 37. 8%) ;and the elevated type was 31 cases (13.8%;male 15.9%, female 9.5%). The incidence of the foramen for supraclavicular nerve was 0.8% in chest radiographs, and 1.4% in the dry bones. The incidence of the elevated conold tubercle was 65.1% (male 64.0%, female 65.9%) in chest radiographs, and 96.9% (male 95.4%, female 100.0%) in the dry bones. CONCLUSIONS: The incidence of the depressed rhomboid fossa in chest radiographs was higher in men and the right clavicle. The incidence of flat rhombo~d fossa in chest radiographs decreased according to increase of age. The foramen for supraclavicular nerve was occasionally found (0.8% in chest radiographs; 1.4% in the dry bones).
Clavicle* ; Female ; Humans ; Incidence ; Male ; Radiography, Thoracic* ; Thorax*

No abstract available.
Aorta* ; Endothelium-Dependent Relaxing Factors*

No abstract available.
Animals ; Liver* ; Rats*

No abstract available.
Aged* ; Child* ; Dislocations* ; Hip* ; Humans

No abstract available.
Prune Belly Syndrome*

No abstract available.
Antiviral Agents/administration & dosage ; Hepatitis B/*prevention & control ; Humans ; Immunization, Passive ; Immunoglobulins/administration & dosage ; *Liver Transplantation ; Recurrence

No abstract available.
Animals ; Liver* ; Rats*

No abstract available.
Kidney Transplantation* ; Pancreatitis*