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Heat stroke

Abdulaziz H Alzeer, E H Wissler
Heat stroke is a serious health concern globally, which is associated with high mortality. Newer treatments must be designed to improve outcomes. The aim of this study is to evaluate the effect of variations in ambient temperature and wind speed on the rate of cooling in a simulated heat stroke subject using the dynamic model of Wissler. We assume that a 60-year-old 70-kg female suffers classic heat stroke after walking fully exposed to the sun for 4 h while the ambient temperature is 40 °C, relative humidity is 20%, and wind speed is 2...
May 18, 2018: International Journal of Biometeorology
Haggai Schermann, Erin Craig, Einat Yanovich, Itay Ketko, Gary Kalmanovich, Ran Yanovich
CONTEXT:   The heat-tolerance test (HTT) is a screening tool for secondary prevention of exertional heat illness by the Israel Defense Forces. To discern participant tolerance, recruits are exposed to intermediate environmental and exercise stresses, and their physiological responses, core temperature, and heart rate are monitored. When their physiological measures rise at a higher rate or exceed the upper levels of absolute values compared with other participants, heat intolerance (HI) is diagnosed...
April 2018: Journal of Athletic Training
Jing Liu, Shengming Wan, Yun Zhang, Shu Zhang, Hongying Zhang, Shiwen Wu
Heat stroke, the most serious type of heat illness, refers to the presence of hyperthermia (core temperature >40°C), accompanied by central nervous system dysfunction. The hippocampus is a particularly vulnerable region in the early stage of heat stroke. Increasing evidence suggests that dysregulation of brain iron metabolism is involved in many neurodegenerative diseases. However, whether heat stroke causes dysfunction of iron metabolism, as well as iron-regulatory proteins, in the hippocampus remains unknown...
May 11, 2018: Shock
Ting-Heng Chou, Jakob R Allen, Dongwoo Hahn, Brian K Leary, Edward F Coyle
The decline in stroke volume (SV) during exercise in the heat has been attributed to either an increase in cutaneous blood flow (CBF) that reduces venous return or an increase in heart rate (HR) that reduces cardiac filling time. However, the evidence supporting each mechanism arises under experimental conditions with different skin temperatures (Tsk ) (e.g.; {greater than or equal to}38{degree sign}C vs. {less than or equal to}36{degree sign}C respectively). We systematically studied cardiovascular responses to progressively increased Tsk (32{degree sign}C to 39{degree sign}C) with narrowing of the core-to-skin gradient during moderate intensity exercise...
May 10, 2018: Journal of Applied Physiology
Jon G Divine, Matthew W Daggy, Emily E Dixon, Dustin P LeBlanc, Richard A Okragly, Kimberly A Hasselfeld
No abstract text is available yet for this article.
May 2018: Current Sports Medicine Reports
Jong-Il Choi, Sung-Kon Ha, Dong-Jun Lim, Sang-Dae Kim, Se-Hoon Kim
Objective: Diagnosing acute cerebral infarction is crucial in determining prognosis of stroke patients. Although many serologic tests for prompt diagnosis are available, the clinical application of serologic tests is currently limited. We investigated whether S100β, matrix metalloproteinase-9 (MMP-9), D-dimer, and heat shock protein 70 (HSP70) can be used as biomarkers for acute cerebral infarction. Methods: Focal cerebral ischemia was induced using the modified intraluminal filament technique...
May 4, 2018: Journal of Korean Neurosurgical Society
Dong Guo, Ji Ma, Tengfei Li, Lei Yan
Dysfunction of the microRNA (miR) network has been emerging as a main regulator in ischemic stroke. Recently, studies have linked the deregulation of miR-122 to ischemic stroke. However, the specific role and molecular mechanism of miR-122 in ischemic stroke remain to be further investigated. Here, we found that miR-122 was decreased in mouse N2A neuroblastoma (N2A) cells after oxygen-glucose deprivation (OGD) and mouse brain after transient middle cerebral artery occlusion (MCAO). OGD treatment significantly increased N2A cell death and Caspase-3 activity, and decreased Bcl-2 protein expression...
April 28, 2018: Experimental Cell Research
Kaiyun Jin, Silan Zhang, Susheng Zhou, Jian Qiao, Yanhui Song, Jiangtao Di, Dengsong Zhang, Qingwen Li
Artificial yarn/fiber muscles have recently attracted considerable interest for various applications. These muscles can provide large-stroke tensile and torsional actuations, resulting from inserted twists. However, tensional tethering of twisted muscles is generally needed to avoid muscle snarling and untwisting. In this paper a carbon nanotube (CNT) yarn muscle that is tethering-free and twist-stable is reported. The yarn muscle is prepared by allowing the self-plying of a coiled CNT yarn. When driven by acetone adsorption, this muscle shows decoupled actuations, which provide fast and reversible ∼13...
April 20, 2018: Nanoscale
Hyeon J Kim, Ying Wei, Gregory R Wojtkiewicz, Ji Y Lee, Michael A Moskowitz, John W Chen
Myeloperoxidase (MPO) is a pro-inflammatory enzyme abundantly secreted by activated myeloid cells after stroke. We show that when MPO activity is either blocked by the specific inhibitor 4-aminobenzoic acid hydrazide (ABAH) in wildtype (WT) mice or congenitally absent (MPO-/- ), there was decreased cell loss, including degenerating neurons and oligodendrocytes, in the ischemic brains compared to vehicle-treated WT mice after stroke. MPO inhibition also reduced the number of activated myeloid cells after ischemia...
January 1, 2018: Journal of Cerebral Blood Flow and Metabolism
Luling Wu, Yang Wang, Tony D James, Nengqin Jia, Chusen Huang
Heat stroke is a lethal condition which can cause dysfunction in the central nervous system, multi-organ damage and even death. However, there is still limited knowledge of the detailed mechanism about the roles of lysosomes in heat stroke due to lack of effective tools. Herein, we introduce our previously developed hemicyanine with a large D-π-A structure as the key fluorophore to develop a new fluorescent probe (CPY) for ratiometric mapping of lysosomal pH changes in live cells under a heat shock stimulus...
April 19, 2018: Chemical Communications: Chem Comm
Tsuyoshi Honjo, Yuhwan Seo, Yudai Yamasaki, Nobumitsu Tsunematsu, Hitoshi Yokoyama, Hiroaki Yamato, Takehiko Mikami
The Olympic Games will be held in Tokyo in 2020 and the period will be the hottest period of the year in Japan. Marathon is a sport with a large heat load, and it is said that the risk of heat stroke rises more than other sports activities. The thermal environment of the 2020 Tokyo Olympic marathon course is analyzed by using wet-bulb globe temperature (WBGT) and Universal Thermal Climate Index (UTCI) map of the center area of Tokyo. The change due to the place, the effect of the shadow of the building, and the position on the course was analyzed from the distribution of WBGT and UTCI in the short-term analysis of sunny day from August 2 to August 6, 2014...
April 17, 2018: International Journal of Biometeorology
Qinghua Li, Rongqing Sun, Hongdi Lyu, Dexin Shen, Qing Hu, Haiwei Wang, Nannan Wang, Jin Yan, Jing Wang
OBJECTIVE: To investigate the protective effect of mild hypothermia at different starting times on the physiological functions of the viscera of exertional heat stroke (EHS). METHODS: A prospective randomized controlled trial was conducted. EHS patients admitted to intensive care unit of the 159th Hospital of People's Liberation Army and the First Affiliated Hospital of Zhengzhou University from June 2015 to June 2017 were enrolled. The patients were divided into 2, 4, 6 hours start hypothermia treatment groups according to the random number table method, the mild hypothermia was initiated at 2, 4 and 6 hours after the disease onset respectively, and the methods were the same in each group...
April 2018: Zhonghua Wei Zhong Bing Ji Jiu Yi Xue
J Herold, A Mitrasch, E Lorenz, U Lodes, I Tanev, R Braun-Dullaeus, F Meyer
BACKGROUND: Hyperthermia often ends fatally and must therefore be promptly recognized and adequately treated. CASE: A 28-year-old man participated in a long-distance race (3 km) on a hot summer day (28 °C). The runner collapsed, had to vomit but continued the run and reached the finish. Neurologically, the patient presented with intermittent cerebral seizures. External cooling batteries were immediately applied and cold infusions were started. The patient was admitted to the intensive care unit of the university hospital (body temperature 40...
April 12, 2018: Der Internist
Zachary S Wettstein, Sumi Hoshiko, Jahan Fahimi, Robert J Harrison, Wayne E Cascio, Ana G Rappold
BACKGROUND: Wildfire smoke is known to exacerbate respiratory conditions; however, evidence for cardiovascular and cerebrovascular events has been inconsistent, despite biological plausibility. METHODS AND RESULTS: A population-based epidemiologic analysis was conducted for daily cardiovascular and cerebrovascular emergency department (ED) visits and wildfire smoke exposure in 2015 among adults in 8 California air basins. A quasi-Poisson regression model was used for zip code-level counts of ED visits, adjusting for heat index, day of week, seasonality, and population...
April 11, 2018: Journal of the American Heart Association
Robert C Oh, Meghan Galer, Michael M Bursey
No abstract text is available yet for this article.
April 2018: Current Sports Medicine Reports
Shoji Yokobori, Yuichi Koido, Hajime Shishido, Toru Hifumi, Kenya Kawakita, Tomoya Okazaki, Shinichirou Shiraishi, Eiji Yamamura, Takashi Kanemura, Takanobu Otaguro, Gaku Matsumoto, Yasuhiro Kuroda, Yasufumi Miyake, Yasutaka Naoe, Kyoko Unemoto, Hiroshi Kato, Kiyoshi Matsuda, Hisashi Matsumoto, Hiroyuki Yokota
OBJECTIVES: Heat stroke is a life-threatening condition with high mortality and morbidity. Although several cooling methods have been reported, the feasibility and safety of treating heat stroke using intravascular temperature management are unclear. This study evaluated the efficacies of conventional treatment with or without intravascular temperature management for severe heat stroke. DESIGN: Prospective multicenter study. SETTING: Critical care and emergency medical centers at 10 tertiary hospitals...
April 5, 2018: Critical Care Medicine
Hannes Kulla, Irina Akhmetova, Sebastian Haferkamp, Mathias Röllig, Christiane Maierhofer, Klaus Rademann, Franziska Luise Emmerling
We present an in situ triple coupling of synchrotron X-ray diffraction with Raman spectroscopy, and thermography to study milling reactions in real time. This combination of methods allows a correlation of the structural evolution with temperature information. The temperature information is crucial for understanding both thermodynamics and reaction kinetics. Exemplarily, the reaction mechanism of three prototypical mechanochemical syntheses were elucidated. General trends regarding the temperature development during milling could be identified...
March 31, 2018: Angewandte Chemie
Wei Yang, Ming-Quan Li, Yang Li, Lei-Lei Sun, Yan-Ming Xie, Chong-Hui Guo, Yan Zhuang
Under the theoretical guidance of "combination of disease and syndrome, correspondence between syndrome and prescription, and dynamic space-time", 11 135 acute ischemic stroke patients were collected from hospital information system(HIS) of many 3A grade hospitals of traditional Chinese medicine. Complex network analysis was adopted to obtain the core syndrome elements in different periods of acute ischemic stroke patients, and it was found that the core syndrome elements were blood stasis syndrome, phlegm, endogenous wind, Yin deficiency, Qi deficiency, heat, hyperactivity of liver Yang, liver, and kidney of patients in hospital for the first day, and during 8-14 d in hospitalization, the core syndrome elements were blood stasis, phlegm, Yin deficiency, Qi deficiency, endogenous wind, hyperactivity of liver Yang, liver, and kidney...
February 2018: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
Yuri Hosokawa, William M Adams, Luke N Belval, Robert J Davis, Robert A Huggins, John F Jardine, Rachel K Katch, Rebecca L Stearns, Douglas J Casa
To investigate the influence of estimated wet bulb globe temperature (WBGT) and the International Institute of Race Medicine (IIRM) activity modification guidelines on the incidence of exertional heat stroke (EHS) and heat exhaustion (HEx) and the ability of an on-site medical team to treat those afflicted. Medical records of EHS and HEx patients over a 17-year period from the New Balance Falmouth Road Race were examined. Climatologic data from nearby weather stations were obtained to calculate WBGT with the Australian Bureau of Meteorology (WBGTA ) and Liljegren (WBGTL ) models...
March 29, 2018: International Journal of Biometeorology
Dmitry V Zaretsky, Hannah Kline, Maria V Zaretskaia, Mary Beth Brown, Pamela J Durant, Nathan J Alves, Daniel E Rusyniak
Stimulants cause hyperthermia, in part, by increasing heat generation through exercise. Stimulants also delay the onset of fatigue and exhaustion allowing animals to exercise longer. If used in a warm environment, this combination (increased exercise and decreased fatigue) can cause heat stroke. The dorsomedial hypothalamus (DMH) is involved in mediating locomotion from stimulants. Furthermore, inhibiting the DMH decreases locomotion and prevents hyperthermia in rats given stimulants in a warm environment. Whether the DMH is involved in mediating exercise-induced fatigue and exhaustion is not known...
March 22, 2018: Brain Research
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