Manifestaciones clínicas, diagnóstico y tratamiento del golpe de calor / Clinical Manifestations, Diagnosis and Management of Heat Stroke

Introducción: El golpe de calor es una enfermedad que fue descrita hace más de 2000 años, sin embargo, los cambios climáticos que se han presentado en las últimas décadas han permitido que su prevalencia esté en aumento. Se considera una entidad compleja en la cual existe un compromiso importante de la termorregulación corporal y, en consecuencia, del resto de sistemas. Objetivos: Orientar al abordaje adecuado y óptimo de conceptos clínicos, epidemiológicos, factores el riesgo, presentación clínica y repercusión sobre los diferentes sistemas. Métodos: Se realizó una revisión de la literatura científica de personas con golpe de calor, en quienes se evaluaron sus factores asociados, métodos diagnósticos y manejos terapéuticos. Se realizó una búsqueda de la literatura en las siguientes bases de datos: Pubmed/Medline, Science Direct, Scopus, DOAJ, Embase, Cochrane, Direme, Redalyc y SciELO. Conclusiones: El golpe de calor es una urgencia médica que implica un manejo rápido y óptimo dado su morbilidad y mortalidad, lo cual puede minimizarse si se cumplen los objetivos de tratamiento. El enfriamiento por inmersión en agua helada, por convección o evaporación son las medias más usadas. Evitar la falla multiorgánica es el segundo objetivo terapéutico(AU)

Introduction: Heat stroke is a disease described more than 2000 years ago; however, the climatic changes that have occurred in recent decades have allowed an increase in its prevalence. It is considered a complex entity in which there is an important compromise of body thermoregulation and, consequently, of the rest of the systems. Objectives: To define important concepts concerning heat stroke, risk factors, clinical presentation and repercussions on the different systems, as well as to guide an appropriate and optimal management. Methods: A review of the scientific literature about people with heat stroke was carried out to assess its associated factors, diagnostic methods and therapeutic management. A literature search was performed in the following databases: Pubmed/Medline, Science Direct, Scopus, DOAJ, Embase, Cochrane, Bireme, Redalyc, and SciELO. Conclusions: Heat stroke is a medical emergency that requires rapid and optimal management given its morbidity and mortality, which can be minimized if management goals are met. Cooling by immersion into ice water, convection or evaporation are the most commonly used measures. Avoidance of multiorgan failure is the second therapeutic objective(AU)

Protective effect of L-carnitine on myocardial injury in rats with heatstroke

Abstract Purpose: To investigate the protective effect of L-carnitine on myocardial injury in rats with heatstroke. Methods: orty-eight rats were randomly divided into control, heatstroke and 25, 50 and 100 mg/kg L-carnitine groups. The last three groups were treated with 25, 50 and 100 mg/kg L-carnitine, respectively, for seven successive days. Then, except for the control group, the other four groups were transferred into the environment with ambient temperature of (39.5 ± 0.4 °C) and relative humidity of (13.5 ± 2.1%) for 2 h. The core temperature (Tc), mean arterial pressure (MAP), heart rate (HR) and serum and myocardial indexes were detected. Results: Compared with the heatstroke group, in the 100 mg/kg L-carnitine group, the Tc was significantly decreased, the MAP and HR were significantly increased, the serum creatine kinase, lactate dehydrogenase, alkaline phosphatase, aspartate aminotransferase, tumor necrosis factor α and interleukin 1β levels were significantly decreased, the myocardial superoxide dismutase and glutathione peroxidase levels were significantly increased, the myocardial malondialdehyde level was significantly decreased and the cardiomyocyte apoptosis index and myocardial caspase-3 protein expression level were remarkably decreased (p < 0.05). Conclusions: The L-carnitine pretreatment can alleviate the myocardial injury in heatstroke rats through reducing the inflammatory response, oxidative stress and cardiomyocyte apoptosis.

Golpe de calor: Síndrome del niño olvidado / Heat Stroke: Forgotten baby syndrome

El golpe de calor es la forma más severa de las enfermedades por calor. Es una emergencia médica que puede comprometer la vida del paciente. Se caracteriza por hipertermia central extrema asociada a daños neurológicos. Los lactantes y niños pequeños son más propensos a sufrirla, sobretodo, en el marco del llamado "Síndrome del Niño Olvidado". Reportamos un caso que ilustra los severos daños de dejar atrapado a un niño en un vehículo, su evolución y manejo.

Heat stroke is the most severe form of heat related illeness. It is a pediatric emergecy and a life-threatening condition in children. Is defined by extreme core hyperthermia accompanied by central nervous system disfunction. Infants and children are at higher risk of heat stroke due to the so called "Forgotten Baby Syndrome". We present an illustrative case of a child who died left unattended in a closed vehicle, his evolution and management.

Heat stroke during long-term clozapine treatment: should we be concerned about hot weather? / Heat stroke durante tratamento de longo prazo com clozapina: devemos nos preocupar com o tempo quente?

Objective To describe the case of a patient with schizophrenia on clozapine treatment who had an episode of heat stroke. Case description During a heat wave in January and February 2014, a patient with schizophrenia who was on treatment with clozapine was initially referred for differential diagnose between systemic infection and neuroleptic malignant syndrome, but was finally diagnosed with heat stroke and treated with control of body temperature and hydration. Comments This report aims to alert clinicians take this condition into consideration among other differential diagnoses, especially nowadays with the rise in global temperatures, and to highlight the need for accurate diagnosis of clinical events during pharmacological intervention, in order to improve treatment decisions and outcomes.

Objetivo Descrever o caso de um paciente com esquizofrenia em tratamento com clozapina acometido por um episódio de heat stroke. Descrição do caso Durante uma onda de calor em janeiro e fevereiro de 2014, um paciente com esquizofrenia em tratamento com clozapina foi inicialmente encaminhado para diagnóstico diferencial de infecção sistêmica e síndrome neuroléptica maligna, tendo obtido o diagnóstico final de heat stroke, tratado com controle de temperatura corporal e hidratação. Comentários Este relato de caso tem como objetivo alertar os clínicos para este diagnóstico diferencial, que pode surgir com mais frequência à medida que as temperaturas globais continuarem a aumentar, e também destacar a importância da realização de um diagnóstico mais acurado, que possa melhorar as decisões de tratamento e os desfechos clínicos para os pacientes.

Golpe de calor / Heatstroke

El golpe de calor es una situación en la que una persona sometida a altas temperaturas ambientales experimenta un fracaso, potencialmente letal, del sistema de termorregulación corporal. Se trata de una patología infradiagnosticada, de baja prevalencia, pero con elevada morbimortalidad, cuya incidencia ha aumentado en los últimos años y seguramente seguirá aumentando, debido a la frecuencia cada vez mayor de las olas de calor vinculadas al cambio climático, producto del calentamiento global. Su presentación clínica se caracteriza por temperaturas corporales por encima de los 40º C y disfunción orgánica múltiple que, si no se tratan de manera rápida y adecuada, conducen a la muerte. Los pilares de su tratamiento son el sostén de las funciones en falla y la disminución inmediata de la temperatura central.(AU)

Heat stroke is a situation where a person subject to high temperatures experiences the failure of the body thermoregulation system, a potentially lethal condition. This is an underdiagnosed disease, with low prevalence, but a high mortality, whose incidence has increased in recent years and will surely continue to rise due to the increasing frequency of heat waves linked to climate change, as a result of global warming. Its clinical presentation is characterized by body temperature >40º C and multiple organ dysfunction leading to death, if the patient does not receive prompt and appropriate treatment. The mainstays of treatment are function support and the immediate drop in core temperature.(AU)

Golpe de calor: a propósito de un caso clínico / Heat stroke. a case report

El golpe de calor es una entidad poco frecuente y subdiagnosticada. La elevación de la temperatura corporal es la que desencadena las disfunciones metabólicas que pueden incluso llevar a la muerte. Se presenta el caso de un militar que se encontraba realizando ejercicios de infantería, durante el mes de septiembre, en días donde se produjeron condiciones climáticas extremas y desarrolla un cuadro de Disfunción Orgánica Múltiple (DOM) primaria; fue llevado al Servicio de Emergencia del Hospital de Fray Bentos, Río Negro. La evolución inicial se caracterizó por deterioro de la función neurológica, respiratoria, necesidad de ventilación mecánica, falla renal aguda y disfunción hematológica; se establecieron los diagnósticos de golpe de calor, injuria renal, rabomiólisis, insuficiencia respiratoria aguda y coagulación intravascular diseminada (CID). A pesar del tratamiento y manejo de sostén tiene una mala evolución, falleciendo a las 48 horas del ingreso. El caso nos recuerda que la exposición a condiciones de calor por arriba de la temperatura corporal, deteriora los mecanismos de control de calor corporal y metabólico. Es necesario un diagnóstico rápido y un manejo de sostén para conseguir una evolución satisfactoria.

A heat stroke is a very rare and under diagnosed entity. The rise in the body’s temperature is the element that triggers the metabolic dysfunctions that can even lead to death. A case of a soldier is presented; this soldier was training, doing his infantry exercises routine, during September, in days were extreme climate situations were happening, installing a case of primary Multiple Organ Dysfunction (MOD) syndrome. The soldier was taken to the Emergency Service in Fray Bentos’ Hospital, in Rio Negro. The initial evolution was clumsy and slowly, and the neurologic and breathing functions were worsening, with acute renal failure, and also hematological dysfunction. In addition to this, the patient was in need of mechanic ventilation. The diagnosis of temperature shock, acute renal injury, Rhabdomyolysis, acute respiratory failure and disseminated intravascular coagulation (DIC) were established. Supportive care was given to the patient, with an un satisfactory development, leading to death 48 hours after the hospital admission. This case reminds us that, the exposure to weather conditions that are over the body temperature interferes in the metabolism and the body’s mechanisms for controlling heat. A quick diagnosis and supportive care are needed in order to achieve a satisfactory evolution.

Effects of propofol on damage of rat intestinal epithelial cells induced by heat stress and lipopolysaccharides

Gut-derived endotoxin and pathogenic bacteria have been proposed as important causative factors of morbidity and death during heat stroke. However, it is still unclear what kind of damage is induced by heat stress. In this study, the rat intestinal epithelial cell line (IEC-6) was treated with heat stress or a combination of heat stress and lipopolysaccharide (LPS). In addition, propofol, which plays an important role in anti-inflammation and organ protection, was applied to study its effects on cellular viability and apoptosis. Heat stress, LPS, or heat stress combined with LPS stimulation can all cause intestinal epithelial cell damage, including early apoptosis and subsequent necrosis. However, propofol can alleviate injuries caused by heat stress, LPS, or the combination of heat stress and LPS. Interestingly, propofol can only mitigate LPS-induced intestinal epithelial cell apoptosis, and has no protective role in heat-stress-induced apoptosis. This study developed a model that can mimic the intestinal heat stress environment. It demonstrates the effects on intestinal epithelial cell damage, and indicated that propofol could be used as a therapeutic drug for the treatment of heat-stress-induced intestinal injuries.

Hipertermia por intermação em cão: relato de caso / Hyperthermia due to heat stroke in dogs: case report

O objetivo deste trabalho é relatar um caso de hipertermia por intermação em um cão da raça São Bernardo, destacando os procedimentos emergenciais realizados para o controle desta enfermidade.

Insuficiência hepática fulminante por intermação induzida por exercício / Fulminant hepatic failure (FHF) by exercise-induced exertional heatstroke

Intermação induzida por exercício é uma condição potencialmente fatal causada pela elevação extrema da temperatura corporal central. Envolvimento hepático leve a moderado afeta todos os pacientes e manifesta-se pela elevação das enzimas hepáticas. A ocorrência de falência hepática no curso da intermação por exercício é rara e tem prognóstico reservado. Relata-se um caso de insuficiência hepática fulminante em um homem de 36 anos após correr 8km em corrida de rua (corrida rústica) na cidade de Manaus (AM). O paciente desenvolveu insuficiência renal aguda, rabdomiólise e achados compatíveis com insuficiência hepática fulminante (elevação importante das aminotransferases, coagulopatia, letargia e episódios de confusão). As funções hepáticas e renais apresentaram melhora gradual e espontânea sem necessidade de diálise. Três meses após o paciente encontrava-se bem, com enzimas hepáticas normais e com retorno gradual à prática de esportes. Embora rara, a falência hepática aguda deve ser incluída nas complicações da intermação induzida por exercício, a qual pode ter resolução espontânea com medidas conservadoras.

Exercise-induced exertional heatstroke (EHS) is a potentially fatal disorder caused by extreme elevation of the core body temperature. Mild to moderate liver involvement affects nearly all patients and it is manifested by increase of the serum liver enzymes. Liver failure occurring as a component of exertional heatstroke is rare and carries a poor prognosis. A case of acute liver failure in a healthy 36 year-old man after participation in an 8-km race in Manaus, located near the Amazon Tropical Forest in Brazil, is reported here. The patient presented renal failure, severe rhabdomyolysis and findings of fulminant hepatic failure (very high aminotransferases levels, elevated international normalized ratio (INR), lethargy and episodes of confusion). Hepatic and renal functions improved spontaneously with conservative measures and he was discharged within eight days. Three months later he was completely asymptomatic and gradually running again. Although rare, acute liver failure should be included in the complications associated with exertional heatstroke. Conservative management may be effective in some patients with this kind of acute liver failure.

Prevención de enfermedades estivales / Prevention of summer diseases

En este artículo se informa cómo las variaciones climáticas afectan la salud de la población y se analizan las enfermedades más comunes en el período estival, así como la forma de prevenirlas, con el objetivo de promover el rol educador de los enfermeros

Colapso pelo calor esforço induzido: reconhecimento para salvar vidas e tratamento imediato em instalações atléticas / Exertional heat stroke: life-saving recognition and onsite treatment in athletic settings

O prognóstico do colapso pelo calor esforço induzido depende do produto do tempo de duração em que a temperatura central ficou elevada e do grau da elevação. O atleta com EHS que tem pronta descoberta e que é resfriado de maneira eficiente, muito provavelmente irá sobreviver ao episódio com pouco ou nenhum efeito residual. Em contraste, o atleta com apresentação atrasada para o tratamento, especialmente se a área sob a curva de resfriamento for > 60 graus-minuto (centígrados) terá um curso complicado e geralmente fatal. Os métodos de condução do resfriamento com imersão em gelo ou água gelada ou envolvimento em toalhas com água gelada proporcionarão uma rápida e consistente redução da temperatura de todo o corpo, que irá salvar tanto os órgãos quanto a vida. O reconhecimento depende em alto grau da suspeita por parte dos próprios atletas, treinadores e pessoal médico local. Em condições de alto risco, os atletas devem se supervisionar, procurando por mudanças sutis que podem ser sinais de EHS.(AU)The prognosis for exertional heat stroke depends upon the product of length of time the core temperature is elevated and the degree of elevation. The athlete with EHS who is discovered promptly and efficiently cooled will most likely survive the episode with little if any residual. In contrast, the athlete who has delayed presentation for treatment, especially if the area under to cooling curve is > 60 degree-minutes (centigrade), will have a complicated and often fatal course. Conductive cooling methods with ice or cool water immersion or rotating ice water cooled towels provide rapid and consistent whole body temperature reduction that is both organ and life saving. Recognition depends on a high index of suspicion on the part of athletes, coaches, and onsite medical personnel. In high risk conditions, athletes should "buddy up" to watch for subtle changes that can signal the onset of EHS.(AU)El pronóstico del choque térmico (CT) relacionado con el ejercicio depende...

Golpe de calor / Heat of blow

Entre las entidades patológicas relacionadas con calor, el denominado golpe de calor, tanto clásico como post ejercicio, es el más grave, representando una amenaza a la vida del paciente. Fallas en la termorregulación y alteración en los mecanismos que regulan las respuestas inflamatorias y frente al estrés, facilitan la progresión de estrés por calor a golpe de calor y contribuyen en la severidad de la injuria tisular. Los niños y adultos mayores tienen mayor riesgo de desarrollar golpe de calor. Esta entidad se define como una elevación de la temperatura corporal mayor a 40.6° C, acompañada por signos de disfunción neurológica. Las complicaciones pueden ser graves e incluyen: falla renal aguda, falla hepática, colapso cardiovascular, alteraciones hidroelectrolíticas, trombocitopenia, rabdomiolisis, coagulación intravascular diseminada y falla orgánica múltiple. El tratamiento se basa en enfriamiento inmediato, soporte de la función orgánica sistémica y prevención y manejo de complicaciones. El pronóstico se relaciona con severidad de la injuria en sistema nervioso central, e intensidad y duración de la hipertermia.

Golpe de calor provocado durante el tratamiento con atropina en un paciente con intoxicación por organofosforado / Heat stroke due to atropine treatment in a patient poisoned with organophosphate

El golpe de calor es una entidad clínica que se clasifica dentro de los síndromes hipertérmicos. La hipertermia es el aumento de la temperatura corporal secundaria a un incremento en la producción de calor o a una disminución en su disipación. Presentamos el caso de un hombre joven intoxicado con insecticida organofosforado, que estando en tratamiento con atropina hace hipertermia severa con compromiso de conciencia y disfunción multiorgánica

Presentación clínica del golpe de calor en niños menores de 2 años en Lima - Perú / Clinic manifestations of heat stroke in infants in Lima-Perú

Objetivo: Describir cuadro clínico de lactantes con golpe de calor (GC) durante El Fenómeno del Niño de 1998. Material y métodos: Se incluyeron 13 lactantes con criterios de GC, que acudieron a Emergencia Pediátrica del Hospital Cayetano Heredia entre el 1º de enero y el 31 marzo 1998. Se registro hematocrito, pruebas de coagulación, función hepática y renal, gasometría, electrolitos séricos y urinarios. Asimismo el flujo urinario, tipo de solución endovenosa utilizada para la rehidratación y la condición final del paciente al alta. Resultados: De los 13 lactantes, 4 fallecieron y 4 quedaron con secuelas neurológicas graves al alta. Los hallazgos clínicos relevantes fueron convulsiones (77 por ciento), dificultad respiratoria (85 por ciento), deshidratación (77 por ciento), Shock (61 por ciento), diarrea aguda (85 por ciento) y poliuria (75 por ciento). En el laboratorio general, anemia (84 por ciento), leucocitos (60 por ciento) tiempo de protrombina prolongado (53 por ciento), hiperglicemia (53 por ciento) elevación de transaminasa (83 por ciento). En las alteraciones del medio interno; hiponatremia (84 por ciento), hipokalemia (70 por ciento), creatinina elevada (84 por ciento), urea elevada (53 por ciento) y acidosis metabólica (8100 por ciento). En el análisis sólo hubo asociación estadística entre el tiempo de protrombina prolongado y el manejo inicial de fluidos con la condición final desfavorable. Conclusión: El GC es una enfermedad de pronóstico grave, donde el tiempo de protrombina prolongado, y el uso de soluciones hipertrónicas en el manejo inicial, se asociaron a riesgo de muerte o secuelas neurológicas graves. Consideramos importante dar a conocer el comportamiento clínico y los factores asociados con un final catastrófico.