Hydrogen Effect on Coke Removal and Catalytic Performance in Pre-Carburization and Methane Dehydro-Aromatization Reaction on Mo/HZSM-5

In this study, the effects of pre-carburization of catalyst, hydrogen addition to methane feed and the space velocity of methane on the catalytic performance in methane to benzene （MTB） reaction were discussed in detail over Mo/HZSM-5 catalyst at 1023 K and 0.3 MPa. Compared with the non-precarburized catalyst, the Mo catalyst pre-carburized under the flow of CHa＋4H2 at 973 K was found to have the higher activity and better stability. Further 6% H2 addition to the methane feed suppressed the aromatic type of coke formation effectively, and improved the stability of catalyst markedly, moreover gave a much longer reaction life of catalyst （53 h at 1023 K and 5400 ml/（g-h）） and much more formation amounts of benzene and hydrogen. With increase of methane space velocity, both the naphthalene formation selectivity and the coke formation selectivity were decreased by the shortened contact time; the benzene formation selectivity and total formation amount before the complete deactivation of catalyst were increased markedly, while the total naphthalene and coke formation amounts did not change much. At high methane space velocity （≥5400 ml/（g·h））, a new middle temperature coke derived from the high temperature aromatic coke was formed on the catalyst; all the coke formed could be burnt off at lower temperature in oxygen, compared with those obtained at low space velocity. Considering the benzene formation amount and catalyst stability together, 5400 ml/（g·h） was proved to be the most efficient methane space velocity for benzene production.

Investigation of Patients with Spontaneous Rupture of the Urinary Bladder

Non-traumatic rupture of the urinary bladder is termed “spontaneous rupture of the urinary bladder”. Although this disorder is relatively rare, when the bladder ruptures into the abdominal cavity, urine leaking into the abdominal cavity leads to the development of urinary peritonitis. We encountered seven patients with spontaneous rupture of the urinary bladder at our institution between 1987 and 2012. Six of these patients were women, all of whom had undergone surgery and radiotherapy to treat malignant uterine tumor. All seven patients suddenly developed abdominal pain and ascites. Urea nitrogen (UN) and creatinine (Cre) levels were greater in ascites than in the blood in all patients. Although all patients were treated conservatively, recurrence was identified in three patients. Recurrence was observed in only one of the four patients who received hyperbaric oxygen therapy. Conclusion: Hyperbaric oxygen therapy may be effective for recurrence of spontaneous rupture of the urinary bladder.

A Case of Multiple Hemorrhagic Gastric Ulcers Developed via a Mechanism Similar to Water-Immersion Restraint Stress

In rats, water-immersion restraint stress is a model of experimental ulceration. We encountered a case in which multiple hemorrhagic gastric ulcers formed in the stomach in a setting similar to water-immersion restraint stress. The patient was a 54-year-old man who was found wet on a riverbank and transported by ambulance. Because of hypothermia and renal failure, hemodialysis was performed. Tarry stools were noted and endoscopy revealed the presence of multiple hemorrhagic gastric ulcers;thus, hemostasis was performed end oscopically. During the course, pseudo membranous colitis also developed and was ameliorated with vancomycin. Further, the renal failure and gastric ulcers improved, and the patient was discharged from hospital 25 days later. The reason why he survived more than 2 weeks was the hot summer season and he was not soaked in the river water throughout.

A Study of Mallory-Weiss Syndrome Secondary to Upper Gastrointestinal Bleeding

Background: In Mallory-Weiss Syndrome (MWS), vomiting causes the mucous membrane and submucosa near the esophagogastric mucosal junction to tear and bleed. Thus, MWS can arise after heavy drinking and as a complication of endoscopic upper gastrointestinal examinations or procedures. However, there has been no report of MWS secondary to upper gastrointestinal bleeding thus far. Case Subjects: Of 79 MWS cases over a 10-year period from 2002 to 2011, we identified and studied 6 cases, in which MWS was probably caused by another lesion causing upper gastrointestinal bleeding. Results: There were 2 cases, each of gastric ulcers, duodenal ulcers, and varicose veins. In 3 cases, MWS was discovered during treatment of the primary lesion and was simultaneously treated. In the other 3 cases, patients were treated for MWS according to endoscopic diagnosis, and the primary lesion was overlooked;in these cases, the primary lesion was identified and treated after the bleeding recurred. One patient with cirrhosis died of hepatic failure. Conclusion: Care should be taken when dealing with MWS because it can occur as a result of vomiting caused by hematemesis or as a complication of endoscopic examination and treatment. When assessing MWS, other hemorrhagic lesions may be overlooked.

The Significance of Angiotensin Converting Enzyme Inhibitor or Angiotensin II Receptor Blocker Use in Sudden Cardiac Death

Objectives: To investigate the relationship between the use of angiotensin converting enzyme (ACE) inhibitor or angiotensin II receptor blocker (ARB) and hyperkalemia in patients diagnosed with sudden cardiac death. Methods: We examined oral ACE inhibitor or ARB use among cardiopulmonary arrest patients brought by ambulance to our emergency room during a 5-year period from January 2012 to December 2016. The cause of death was determined to be sudden cardiac death, despite temporary return of spontaneous circulation after starting cardiopulmonary resuscitation. Subjects were dichotomized into 2 groups, those taking and those not taking an ACE inhibitor or ARB. Variables determined retrospectively included serum potassium, estimated glomerular filtration rate as an index of kidney function and time from cardiopulmonary arrest to return of spontaneous circulation. The Mann-Whitney U-test was used to compare continuous data, and the chi-square test to compare categorical data between groups. The results are expressed as the median plus range. Statistical significance was assumed at p Results: Thirty-five patients met the inclusion criteria. The mean age was 77.1 years (range, 35 - 93 years), and there were 26 males and 9 females. Eleven subjects were ACE inhibitor or ARB users, and 24 were non-users. The serum potassium level was significantly higher in users than non-users (median, 6.2 mEq/L (range, 4.5 - 10.0) vs. 5.2 mEq/L (range, 3.6 - 8.3);p = 0.001). The estimated glomerular filtration rate was significantly lower in users than non-users (median, 25.1 mL/min/1.73 m2 (range, 4.6 - 60.3) vs. 46.9 mL/min/1.73 m2 (range, 19.8 - 97.1);p = 0.009). There was no significant difference in time from cardiopulmonary arrest to return of spontaneous circulation between the 2 groups (median, 24 minutes (range, 3 - 111) vs. 29 minutes (range, 10 - 54);p = 0.355). Conclusion: It is possible that hyperkalemia induced by ACE inhibitor or ARB use is a cause of sudden cardiac death, especially in patients with chronic kidney disease.

Endoscopic Hemostasis of Nonvariceal Gastrointestinal Bleeding

We investigated 2668 patients with non-variceal upper gastrointestinal bleeding and 660 patients with lower gastrointestinal bleeding treated between 1987 and 2011 in our hospital. Upper gastrointestinal bleeding was associated with gastric ulcer, duodenal ulcer, Mallory-Weiss syndrome, esophageal disease, and others. Endoscopic hemostasis was performed in approximately 67% of all cases with upper gastrointestinal bleeding and approximately 90% of cases with ulcer. The hemostasis success rate was over 90% for ulcer bleeding, and was also generally high for other diseases. The total number of patients with lower gastrointestinal bleeding was lower, with it being approximately 20% of those with upper gastrointestinal bleeding. Endoscopic hemostasis was performed in approximately 30% of the patients with lower gastrointestinal bleeding. The hemostasis success rate was generally high, but treatment switch to surgery or interventional radiology (IVR) was observed in some cases with colorectal diverticular bleeding.

The East Japan Great Earthquake and Three Cases of Near-Drowning with Tsunami Due to the Earthquake

We encountered the Great East Japan Earthquake on March 11, 2011. The magnitude of the earthquake is 9.0 and it is one of the greatest from A.D. 1900 to now. The earthquake developed large tsunami and many people living on the pacific coast of east Japan died from lung disorder caused by near drowning with tsunami. We also encountered three cases of lung disorders caused by near drowning. All three were females, and two of them were old elderly. All segments of both lungs were involved in all the three patients, necessitating ICU admission and endotracheal intubation and mechanical ventilation. All three died within three weeks. In at least two cases, misswallowing of oil was suspected from the features noted at the time of the detection. Many bacteria were detected from the phlegm of two cases.