Publications by authors named "Atsuo Nakamura"

Objectives: The coronavirus disease 2019 (COVID-19) pandemic has significantly disrupted emergency medical service (EMS) prehospital care for patients with out-of-hospital cardiac arrest (OHCA), necessitating a thorough assessment of its effects on prehospital time and emergency interventions. Therefore, we aimed to analyze the changes in EMS operations before and after the onset of the pandemic and their potential effects on patient care.

Methods: We retrospectively reviewed OHCA cases between January 2017 and December 2022, categorizing them into pre-pandemic and pandemic phases.

View Article and Find Full Text PDF

Although oral tolerance is a critical system in regulating allergic disorders, the mechanisms by which dietary factors regulate the induction and maintenance of oral tolerance remain unclear. To address this, we explored the differentiation and function of various immune cells in the intestinal immune system under fasting and ad libitum-fed conditions before oral ovalbumin (OVA) administration. Fasting mitigated OVA-specific Treg expansion, which is essential for oral tolerance induction.

View Article and Find Full Text PDF

Delirium is characterized by an acutely altered mental status accompanied by reductions in cognitive function and attention. Delirium in septic patients, termed sepsis-associated delirium (SAD), differs in several specific aspects from the other types of delirium that are typically encountered in intensive care units. Since sepsis and delirium are both closely associated with increased morbidity and mortality, it is important to not only prevent but also promptly diagnose and treat SAD.

View Article and Find Full Text PDF
Article Synopsis
  • Patients with severe COVID-19 on VV-ECMO are at risk for drug-resistant bacterial infections, and changes in serum antibiotic concentrations need to be monitored because of increased volume of distribution.
  • A case study of a 71-year-old COVID-19 patient showed that after receiving VV-ECMO and teicoplanin (TEIC) for a secondary infection, the TEIC levels remained therapeutic, suggesting minimal impact of VV-ECMO on its pharmacokinetics.
  • The conclusion highlights the potential for using TEIC with VV-ECMO in COVID-19 patients, but it calls for more research on TEIC pharmacokinetics in this context to better understand its distribution and effects.
View Article and Find Full Text PDF

Objective Extracorporeal shock wave lithotripsy (ESWL) has been used to treat pancreatolithiasis in patients with chronic pancreatitis (CP), but the high recurrence rate remains challenging. We therefore evaluated the association between body composition parameters and the prediction of retreatment after ESWL. Methods This study retrospectively evaluated 42 patients with CP who had been treated with ESWL between 2008 and 2019 in a single center.

View Article and Find Full Text PDF

Intestinal microbiota-derived metabolites have biological importance for the host. Polyamines, such as putrescine and spermidine, are produced by the intestinal microbiota and regulate multiple biological processes. Increased colonic luminal polyamines promote longevity in mice.

View Article and Find Full Text PDF

Polyamines produced by both prokaryotes and eukaryotes are bioactive substances with pleiotropic effects. Accumulating evidence has demonstrated that polyamines contribute to anti-inflammatory responses by suppressing the expression of proinflammatory cytokines in mononuclear cells and macrophages. However, the effects of polyamines on CD4 T cell responses remain to be elucidated.

View Article and Find Full Text PDF

Background: Rheumatoid arthritis (RA) is a chronic debilitating autoimmune disorder with a high prevalence, especially in industrialized countries. Dysbiosis of the intestinal microbiota has been observed in RA patients. For instance, new-onset untreated RA (NORA) is associated with the underrepresentation of the Clostridium cluster XIVa, including Lachnospiraceae, which are major butyrate producers, although the pathological relevance has remained obscure.

View Article and Find Full Text PDF

The ectopic pancreas is often observed in the gastrointestinal tract, and is typically asymptomatic. A 28-year-old woman was referred to our hospital following repeated vomiting after every meal. Following gastroscopy, contrast-enhanced computed tomography (CE-CT), and endoscopic ultrasonography (EUS), she was diagnosed with gastric outlet obstruction, also known as pyloric obstruction, caused by a giant submucosal cystic tumor.

View Article and Find Full Text PDF

Background: The cystic duct has been included in the staging classification scheme for gallbladder cancer since the 2010 publication of the AJCC Cancer Staging Manual (7th edition). To our knowledge, only seven other cases of adenocarcinoma arising in the remnant cystic duct following cholecystectomy have been reported in the English-language literature, and none has been reported as primary early-stage T1b remnant cystic duct cancer (CDC). We report, herein, a case of primary adenocarcinoma arising in the remnant cystic duct in a patient with history of laparoscopic cholecystectomy for gallstone disease.

View Article and Find Full Text PDF

Introduction: Hemorrhagic shock and encephalopathy syndrome (HSES) is a type of acute encephalopathy mainly seen in infants. It is a syndrome encompassing an onset of high fever, disturbance of consciousness, convulsion, and shock that rapidly progresses to watery diarrhea and liver and renal dysfunctions. It is extremely rare in adults, and the number of reports is limited worldwide.

View Article and Find Full Text PDF

The intestinal microbiome produces various metabolites that may harm or benefit the host. However, the production pathways of these metabolites have not been well characterised. The polyamines putrescine and spermidine required for physiological process are also produced by intestinal microbiome.

View Article and Find Full Text PDF

The objective of this study is to retrospectively assess long-term outcomes and late complications of pancreatic trauma. We studied 14 patients with pancreatic trauma who were treated at the Advanced Emergency Medical Service Center, Kurume University Hospital, between 1981 and 2012 and discharged alive. Relevant data were extracted from patient records and a retrospective patient questionnaire and blood test were completed to evaluate pancreatic function.

View Article and Find Full Text PDF

Recent research has suggested that polyamines (putrescine, spermidine, and spermine) in the intestinal tract impact the health of animals either negatively or positively. The concentration of polyamines in the intestinal tract results from the balance of uptake and export of the intestinal bacteria. However, the mechanism of polyamine export from bacterial cells to the intestinal lumen is still unclear.

View Article and Find Full Text PDF

We performed high-dose loading (12 mg/kg every 12 h for 48 h; 4 doses total) of teicoplanin (TEIC) in patients with severe methicillin-resistant Staphylococcus aureus (MRSA) infections, with the goal of achieving target serum concentration (TEICc) ≥ 15 mg/l within 48 h of starting administration. The safety and effectiveness of the fixed, early-stage administration method were evaluated across a range of kidney dysfunction severity levels. TEIC high-dose loading was administered to 106 patients with MRSA infection from February 2010 to February 2013.

View Article and Find Full Text PDF

Background: Evidence suggests that intestinal microbiota play an important role in the pathogenesis of atopic dermatitis (AD) through induction of immunosuppression and immune tolerance; however, the exact underlying mechanism is unclear. Few studies to date have examined the effects of probiotics on adult-type AD.

Objective: To examine the effects of the probiotic Bifidobacterium animalis subsp lactis LKM512 on adult-type AD and the expression of metabolites that are known to be influenced by gut microbiota in fecal samples.

View Article and Find Full Text PDF

Prevention of quality of life (QOL) deterioration is associated with the inhibition of geriatric diseases and the regulation of brain function. However, no substance is known that prevents the aging of both body and brain. It is known that polyamine concentrations in somatic tissues (including the brain) decrease with increasing age, and polyamine-rich foods enhance longevity in yeast, worms, flies, and mice, and protect flies from age-induced memory impairment.

View Article and Find Full Text PDF

Background: To reduce the incidence of metachronous gastric carcinoma after endoscopic resection of early gastric cancer, Helicobacter pylori eradication therapy has been endorsed. It is not unusual for such patients to be H. pylori negative after eradication or for other reasons.

View Article and Find Full Text PDF

Background: The features of gastric submucosal cancer revealed by magnifying endoscopy have not been reported. Aim of our study was to investigate whether magnifying endoscopy could contribute to the diagnosis of submucosal invasion.

Patients And Methods: In this prospective, cross-sectional study, 197 lesions of gastric differentiated adenocarcinoma, diagnosed as mucosal cancer by conventional endoscopy, were observed by magnifying endoscopy with narrow-band imaging, paying attention to the presence of a blurry mucosal pattern and an irregular mesh pattern.

View Article and Find Full Text PDF

THE DIAGNOSIS OF EARLY GASTRIC CANCER BY MAGNIFYING ENDOSCOPY WITH NBI IS BASED ON TWO COMPONENTS: microvascular pattern and mucosal pattern. Mucosal patterns are characterized by a whitish edge, which has been named the white zone. Some cancerous areas showing a distinct white zone form clear mucosal patterns, whereas others showing a nondistinct white zone do not form mucosal patterns.

View Article and Find Full Text PDF

Atrophic gastritis, whether caused by Helicobacter pylori infection or as a result of an autoimmune process, is associated with corpus atrophy. However, whereas atrophic gastritis caused by H. pylori involves the antrum, the antrum is spared in autoimmune gastritis.

View Article and Find Full Text PDF

Although the incidence of drug-induced collagenous colitis has been increasing, details of its clinical course and histological changes after withdrawal of the suspected causative drugs remain unclear. To shed light on this issue, we studied 15 patients with collagenous colitis diagnosed between 1999 and 2011 in our hospital. Clinical cure was achieved in 14 patients after withdrawal of the suspected causative drugs and in one patient after the administration of prednisolone.

View Article and Find Full Text PDF

We performed a retrospective survey at 15 hospitals in Niigata Prefecture to assess the effectiveness of gemcitabine in patients with stage IV pancreatic cancer and to analyze prognostic factors impacting survival in patients with stage IVb. The subjects were 244 unresectable or metastatic pancreatic cancer patients(IVa 68, IVb 176)who were treated with gemcitabine as first-line therapy. The overall response rate was 6.

View Article and Find Full Text PDF