Coronary artery bypass grafting in two patients with single coronary artery

We experienced two patients with single coronary artery who underwent CABG using arterial grafts successfully. In two patients coronary angiography demonstrated a single coronary artery which was originated in left coronary sinus and was bifurcated to LAD and LCx, and then RCA branched off proximal LAD, passing in front of the right ventricular out flow tract (Sharbaugh Type L-IIa). To the first patient, a 52-year-old man who had angina on exertion due to long stenosis of RCA, CABG to RCA using RITA was carried out. To the second patient, a 57-year-old man who had inferior myocardial infarction due to 90% stenosis of proximal LAD, CABG to RCA using RITA and LAD using LITA was carried out. Single coronary artery without additional congenital cardiac anomalies may lead to myocardial ischemia, necessitating CABG as coronary reconstructions.     

A case of traumatic aneurysm of innominate artery with occlusion of right subclavian artery

A 42-year-old woman with history of chest blunt trauma from an automobile accident 250 days earlier had suffered easy fatigability of the right upper extremity. She had difference of blood pressure between upper extremities, 94/60 mmHg in the right and 126/70 mmHg in the left. Chest CT showed dilation of the innominate artery which compressed the trachea. Aortography showed an aneurysm of the innominate artery and occlusion of the right subclavian artery at its origin. The aneurysm of the innominate artery was resected and replaced with a 6 mm Dacron graft with aid of the external shunt. The right subclavian artery was also reconstructed with same graft. The aneurysm of the innominate artery should be suspected as a rare complication in blunt trauma of the chest.     

A case of ABO-incompatible renal transplant patient with non-insulin-dependent diabetes mellitus; long-standing observation of serial glomerular change by protocol biopsy

A 41-yr-old patient with non-insulin-dependent diabetes mellitus (NIDDM), before and after ABO-incompatible renal transplant, is reviewed using serial protocol biopsy. Although she recovered from delayed hyperacute rejection (DHAR) immediately post-transplantation, her graft function deteriorated gradually. A mild acute transplant glomerulitis, noted at the 155th day post-transplantation, progressed to pronounced chronic transplant glomerulopathy over 5 yr. In the specimen of the last biopsy, at 5 yr post-transplantation, glomeruli demonstrated an exudative hyaline lesion, which was characteristic of diabetic nephropathy in addition to chronic transplant glomerulopathy. Therefore, we made a diagnosis of this glomerular lesion as chronic transplant glomerulopathy complicated by diabetic glomerulopathy. Considering the result of this case, the protocol biopsy is a useful procedure to diagnose an accurate cause of graft dysfunction in individual cases. It is concluded that the protocol biopsy is apparently useful for the detection of various pathological processes occurring in allograft and may contribute to a strategy for improvement of graft survival.     

Mediastinal lymph node metastasis of colon cancer: Report of a case

We herein describe a patient with mediastinal lymph node metastases which occurred after both a primary sigmoid colon cancer and metachronous ovarian metastasis had been resected. The most likely route of metastases to the mediastinum in this case is the paravertebral venous plexus probably connected to the ovarian metastasis, or so-called remetastasis. This case illustrates that the mediastinum is thus a possible metastatic site in patients with colon cancer. Surgeons should therefore pay attention to the mediastinum as well as the lung fields when checking chest X-ray films during a follow-up of patients after a resection of colon cancer.     

Temporal changes in airway protective reflexes elicited by an endotracheal tube in surgical patients anaesthetized with sevoflurane

In order to elucidate temporal changes in airway reflex responses to prolonged tracheal intubation, 14 patients anaesthetized with sevoflurane were studied. In each spontaneously breathing patient with an endotracheal tube in place, the end-tidal concentration of sevoflurane was slowly decreased from the initial value of 1.3% until signs of airway irritation were observed. The value of end-tidal sevoflurane concentration at which the airway reflexes occurred (T(ar)) and the types of airway reflex response elicited at onset of airway reflex response were determined during the periods immediately before (presurgical period) and after surgery (post-surgical period), with an interval ranging from 2 to 7 h between the two periods. There was no significant difference in the values of T(ar) between the presurgical period (0.6 +/- 0.3%, mean +/- SD) and the post-surgical period (0.7 +/- 0.1%). There was a considerable difference in the type of airway reflexes elicited during the two different periods; the initial responses during the presurgical period were the apnoeic reflex and/or forceful expiratory efforts, whereas the initial response during the post-surgical period, in the majority of patients, was the swallowing reflex. Our results indicate that there may be adaptation mechanisms responsible for temporal changes in airway protective reflexes after prolonged endotracheal intubation in surgical patients.     

Laparoscopic bowel resection for early colon cancer

Following the successful introduction of laparoscopic cholecystectomy, many reports confirming the feasibility of using laparoscopy for bowel resection and predicting that it would be advantageous in terms of its minimal invasiveness have been published. In the context of cancer treatment, however, the feasibility of lymphadenectomy, the risk of recurrence, and survival have emerged as major concerns. Even though mucosal cancer (Tis) can be treated by endoscopic resection (ER), when this is not possible open surgery (OS) must be performed. In patients with T1 cancer, tumors showing slight submucosal layer invasion (sm 1) can be treated in the same way as Tis (in cancer) cancers. But 5% to 10% of patients with T1 cancer have massive submucosal layer invasion (sm 2-3) with paracolic lymph node metastasis. At least partial bowel resection with paracolic lymphadenectomy is considered necessary for T1 (sm 2-3) cancers in principle. In summary, laparoscopic local excision of Tis cancers that are endoscopically unresectable and laparoscopically assisted partial resection with paracolic lymphadenectomy for T1 cancers have become accepted because local excision and partial resection with paracolic lymphnedectomy are fairly simple to perform laparoscopically. Therefore as a strategy for the treatment of early colorectal cancer (CRC), minimally invasive laparoscopic bowel resection (LBR) has been positioned between endoscopic resection (ER) and open surgery (OS). While the difficulty of performing radical lymphadenectomy is considered one of the greatest obstacles to the introduction of laparoscopic bowel resection (LBR) for the treatment of advanced colorectal cancer (CRC), early colon cancer is a good indication for laparoscopic bowel resection.     

Dandy-Walker syndrome successfully treated with cystoperitoneal shunting--case report

A neonate presented with Dandy-Walker syndrome manifesting as a large posterior cranial fossa cyst, aplasia of the lower cerebellar vermis, and elevation of the confluence of the sinuses but without hydrocephalus. A cystoperitoneal shunt was placed at one month after birth. The cyst diminished in size, and marked development of the cerebellar hemispheres and descent of the confluence of sinuses were observed, but not vermis development. The primary pathology of Dandy-Walker syndrome is posterior cranial fossa cyst formation due to passage obstruction in the fourth ventricle exit area and aplasia of the lower cerebellar vermis. The first choice of treatment in patients with Dandy-Walker syndrome in whom the cerebral aqueduct is open is cystoperitoneal shunt surgery, regardless of the presence or absence of hydrocephalus.     

The expression of Ca2+/calmodulin-dependent protein kinase I in rat retina is regulated by light stimulation

Ca2+/calmodulin-dependent protein kinase I (CaM-kinase I) in rat retina was analyzed by immunohistochemical analysis, Western blot analysis and kinase activity assay. Western blot analysis revealed two immunoreactive bands similar to those detected in the brain. Developmental studies revealed that CaM-kinase I expression increased in accordance with postnatal development. Expression of CaM-kinase I in the retinas of rats raised in the complete darkness markedly decreased. CaM-kinase I activity assay supported these findings. Synapsin I was shown to be a possible intrinsic substrate of CaM-kinase I in rat retina. These results elucidated that CaM-kinase I is expressed in the retina and may play an important role in the retinal functions and that the expression of CaM-kinase I is regulated by light stimulation.     

Development of new anti-atherosclerotic drugs based on the phenotypic modulation of vascular smooth muscle cells

We have established a novel smooth muscle cell line (SVS) which retains the expression of specific markers for smooth muscle cells, such as smooth muscle myosin-1, calponin and SM22 alpha, from temperature-sensitive SV40 large T-antigen transgenic mice. SVS cells showed temperature-dependent growth and the expression of smooth muscle markers, showing that the differentiation stage can be controlled in this cell line by culture temperature. We have constructed luciferase-reporter cell lines for calponin and SM22 alpha genes by using SVS cells. We detected some compounds including ascorbic acid, which stimulated the expression of smooth muscle markers by the reporter assay. Ascorbic acid and its long lasting derivatives stimulated the expression of markers continuously. Moreover, ascorbic acid activated the expression of markers in synthetic SMCs seen in the intima of a rat balloon injury model. Thus, this reporter system should be useful for discovery of new antiatherosclerotic drugs.     

Inhibition of cell growth in culture by quinones

Quinones were studied for their growth inhibitory effect on cultured malignant cells. HCT-15 cells derived from human colon carcinoma were used for these experiments. Quinones used were arbutin in the benzoquinone group, juglone and lawsone in the naphthaquinone group, alizarin, emodin, 1,8-dihydroxyanthraquinone, and anthraquinone in the anthraquinone group, and xanthone. Cultured cells were incubated with various concentrations of the quinones for four days in a 5% CO2 incubator, after which cell numbers were counted and significance of differences was analyzed by Student's t test. Anthraquinones and naphthaquinones used in these experiments were more effective than the monocyclic quinone. The 50% suppression dose was less than 12.5 micrograms/ml for them. The number of OH groups seemed to play an important role in the degree of the cell growth inhibition: anthraquinones with 2 or 3 OH groups were more effective than those with no OH group like, 9,10-dioxoanthracene and xanthone. In fact, anthraquinones with no OH group and xanthone were not significantly effective. Flow cytometric histograms revealed a specific pattern; that is, lawsone and juglone in the naphthaquinone group and alizarin and 1,8-dihydroxy-anthraquinone in the anthraquinone group blocked mainly the S phase, and emodin in the anthraquinone group blocked the G1 to S phase of the cell cycle.