Kei Nishiyama

ORCID: 0000-0003-3676-0135
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About
Contact & Profiles
Research Areas
  • Cardiac Arrest and Resuscitation
  • Traumatic Brain Injury and Neurovascular Disturbances
  • Non-Invasive Vital Sign Monitoring
  • Coronary Interventions and Diagnostics
  • Cardiac electrophysiology and arrhythmias
  • Sepsis Diagnosis and Treatment
  • Cardiac, Anesthesia and Surgical Outcomes
  • Cardiac Arrhythmias and Treatments
  • Cardiac pacing and defibrillation studies
  • Hemodynamic Monitoring and Therapy
  • Thermal Regulation in Medicine
  • Vascular Procedures and Complications
  • Cardiac Imaging and Diagnostics
  • Emergency and Acute Care Studies
  • Cardiac Structural Anomalies and Repair
  • Heart Failure Treatment and Management
  • Acute Myocardial Infarction Research
  • Mechanical Circulatory Support Devices
  • Central Venous Catheters and Hemodialysis
  • Trauma and Emergency Care Studies
  • Antiplatelet Therapy and Cardiovascular Diseases
  • Respiratory Support and Mechanisms
  • Cardiovascular Effects of Exercise
  • Atrial Fibrillation Management and Outcomes
  • Trauma Management and Diagnosis

Niigata University
2007-2025

Niigata University Medical and Dental Hospital
2022-2025

Kyoto Medical Center
2016-2021

Kyushu University Hospital
2012-2020

Kyoto University
2008-2017

Tokyo Women's Medical University
2015-2016

Kyoto University Hospital
2008-2014

Children's Hospital 2
2012

Fukuoka Children's Hospital and Medical Center for Infectious Diseases
2012

University of Miyazaki
2012

Background— Observational registries comparing coronary artery bypass graft (CABG) surgery and percutaneous intervention (PCI) have reported long-term survival results that are discordant with those of randomized trials. Methods Results— We conducted a multicenter study in Japan enrolling consecutive patients undergoing first CABG or PCI between January 2000 December 2002. Among 9877 enrolled, 5420 (PCI: 3712, CABG: 1708) had multivessel disease without left main involvement. Because age is...

10.1161/circulationaha.107.735902 article EN Circulation 2008-09-30

To investigate the association between regional brain oxygen saturation (rSO2) at hospital arrival and neurological outcomes 90 days in patients with out-of-hospital cardiac arrest (OHCA).The Japan-Prediction of Outcomes post (J-POP) registry is a prospective, multicenter, cohort study to test whether rSO2 predicts after OHCA. We measured OHCA immediately using near-infrared spectrometer placed on forehead non-blinded fashion. The primary endpoint was "neurological outcomes" OHCA.EMS...

10.1016/j.resuscitation.2014.02.012 article EN cc-by-nc-sa Resuscitation 2014-03-05

This study investigated the value of regional cerebral oxygen saturation (rSO2) monitoring upon arrival at hospital for predicting post-cardiac arrest intervention outcomes.We enrolled 1195 patients with out-of-hospital cardiac presumed cause from Japan-Prediction Neurological Outcomes in Patients Post-cardiac Arrest Registry. The primary endpoint was a good neurologic outcome (cerebral performance categories 1 or 2 [CPC1/2]) 90 days post-event.A total 68 (6%) had outcomes. We found mean...

10.1016/j.resuscitation.2015.07.049 article EN cc-by-nc-nd Resuscitation 2015-08-17

Objective Although it has been suggested that the increase in older population contributes to overcrowding emergency departments (EDs), there are limited data defining this relationship. This study examines whether patients’ mean age per day affects length of ED stay. Methods cross-sectional analysis evaluated how patient The was conducted at an attached Fujisawa City Hospital, Japan, between 1 November 2009 and 31 October 2010. Patients scheduled visit for childbirth patients under 15 were...

10.1136/emermed-2012-202050 article EN Emergency Medicine Journal 2013-01-08

AimOur study aimed at filling the fundamental knowledge gap on characteristics of regional brain oxygen saturation (rSO2) levels in out-of-hospital cardiac arrest (OHCA) patients with or without return spontaneous circulation (ROSC) upon arrival hospital for estimating quality cardiopulmonary resuscitation and neurological prognostication these patients.MethodsWe enrolled 1921 OHCA from Japan – Prediction Neurological Outcomes Patients Post-cardiac Arrest Registry measured their rSO2...

10.1016/j.resuscitation.2015.07.013 article EN cc-by-nc-nd Resuscitation 2015-07-26

This study evaluated whether the dynamic needle tip positioning technique increased success rate of ultrasound-guided peripheral venous catheterization in pediatric patients with a small-diameter vein compared static technique.Randomized controlled study.Single institution, Osaka Women's and Children's Hospital.The population included 60 less than 2 years old who required PICU.Patients were randomly divided into (n = 30) or group 30). Each received without positioning, respectively. The...

10.1097/pcc.0000000000002034 article EN Pediatric Critical Care Medicine 2019-06-22

Objectives We determined whether crowding at emergency shelters is associated with a higher incidence of sleep disturbance among disaster evacuees and identified the minimum required personal space shelters. Design Retrospective review medical charts. Setting 30 shelter-based clinics in Ishinomaki, Japan, during 46 days following Great Eastern Japan Earthquake Tsunami 2011. Participants Shelter residents who visited eligible clinics. Outcome measures Based on result locally weighted...

10.1136/bmjopen-2015-009711 article EN cc-by-nc BMJ Open 2016-01-01

SUMMARY Although outbreaks of acute respiratory infection (ARI) at shelters are hypothesized to be associated with shelter crowding, no studies have examined this relationship. We conducted a retrospective study by reviewing medical records evacuees presenting one the 37 clinics in Ishinomaki city, Japan, during 3-week period after Great Eastern Japan Earthquake and tsunami 2011. On basis locally weighted scatter-plot smoothing technique, we categorized into crowded (mean space <5·5 m 2...

10.1017/s0950268815001715 article EN Epidemiology and Infection 2015-08-05

Although increasing staff numbers during shifts when emergency department (ED) crowding is severe can help meet patient demand, it remains unclear how different types of added staff, particularly junior residents, may affect crowding.

10.1371/journal.pone.0110801 article EN cc-by PLoS ONE 2014-11-04

Study Objective We compared the effects of execution diagnostic tests in emergency department (ED) and other common factors on length ED stay to identify those with greatest impacts crowding. Methods Between February 2010 January 2012, we conducted a cross-sectional, single-center study large, urban, teaching hospital Japan. Patients who visited during period were enrolled. excluded (1) patients scheduled for admission or pharmaceutical prescription, (2) neonates requiring intensive care...

10.1371/journal.pone.0108447 article EN cc-by PLoS ONE 2014-10-13

Abstract Introduction Little is known about oxyhemoglobin (oxy-Hb) levels in the cerebral tissue during development of anoxic and ischemic brain injury. We hypothesized that estimated oxy-Hb level, a product Hb regional oxygen saturation (rSO 2 ) , determined at hospital arrival may reflect level neuroprotection patients with post-cardiac arrest syndrome (PCAS). Methods The Japan Prediction neurological Outcomes Post cardiac (J-POP) registry prospective, multicenter, cohort study to test...

10.1186/s13054-014-0500-6 article EN cc-by Critical Care 2014-08-28

This study aimed to determine the accuracy of quick Sequential Organ Failure Assessment (qSOFA) score in predicting mortality among prehospital patients with and without infection. single-center, retrospective, cross-sectional was conducted who arrived via emergency medical services (EMS). We calculated qSOFA Modified Early Warning Score (MEWS) from records. identified as infected if they received intravenous antibiotics at department or within first 24 hours. Receiver operating...

10.1371/journal.pone.0202111 article EN cc-by PLoS ONE 2018-08-16
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