央视网消息：近日，全国多地开启"炙烤模式"。持续高温环境下，有一种危险悄然逼近——"热中风"。"中风"是卒中的俗称，而"热 中风"是指在高温天气，也就是气温超过32摄氏度下出现的卒中事件。"热中风"有什么症状？和普通中暑有什么区别？ 发生"热中风"时，可能会出现头晕、头痛、恶心呕吐等症状。这些症状和中暑有相似之处，该如何区分"热中风"和中暑？ 研究表明，极端高温天气和极寒天气都会增加脑血管疾病的发生风险。根据卒中引起的出血或缺血的异常状态，一般可将其分为缺 血性卒中和出血性卒中，"热中风"中的大多数属于缺血性卒中。 发生机制：高温导致的血液血管血压变化 在炎热天气下，人体出汗增多，血管扩张明显，如果水分补充不及时，容易导致血容量不足，在血液浓缩的情况下，血小板易于聚 集，就会增加血栓的形成风险。而高温容易导致人心情烦躁、易怒，从而引发血压波动，也可能诱发卒中。 专家介绍，夏季频繁进出空调房间或让冷风直吹头面部，会使血管迅速收缩或扩张。老年人的血管弹性较差，受冷刺激易引发血管 痉挛。这些因素相互叠加，导致高温天气成为卒中发作的重要诱因。 区分"热中风"和中暑：局部神经功能受损 中暑主要是体温调节功能紊乱，最早症 ...

Core Viewpoint - The article emphasizes that summer is not a safe season for cerebrovascular diseases, highlighting the increased risk of strokes due to high temperatures and temperature fluctuations caused by air conditioning [1][2]. Group 1: Cerebrovascular Disease Risks - The incidence of cerebrovascular diseases, particularly ischemic strokes, significantly increases when temperatures exceed 33°C [1]. - The temperature difference between air-conditioned environments and outdoor heat can lead to severe vascular stress, particularly when the indoor-outdoor temperature difference exceeds 7°C [1]. Group 2: Mechanisms of Risk - High temperatures can lead to dehydration, reducing blood volume and increasing blood viscosity, which heightens the risk of strokes [2]. - Alternating between extreme temperatures can cause significant fluctuations in blood pressure, increasing the likelihood of both hemorrhagic and ischemic strokes [2]. Group 3: High-Risk Populations - High-risk groups for strokes include individuals with pre-existing cerebrovascular conditions, elderly individuals with vascular hardening, and younger individuals with unhealthy lifestyles [2]. Group 4: Prevention and Response - Recognizing risk factors is crucial for stroke prevention, including adequate hydration, regular sleep patterns, and avoiding extreme temperature changes [2]. - In the event of a stroke, immediate action is critical, as the first 4.5 to 6 hours are vital for effective treatment to minimize brain damage [2].

Core Insights - The article highlights the increased risk of cerebrovascular diseases during both cold and hot seasons, emphasizing that high temperatures can also trigger conditions like ischemic stroke, particularly when temperatures exceed 33°C [1][3] Group 1: Health Risks - A significant rise in the incidence of cerebrovascular diseases is observed when temperatures surpass 33°C, with ischemic stroke being particularly prominent [1] - The risk of cardiovascular diseases is exacerbated by the temperature difference between air-conditioned environments and outdoor heat, especially when the difference exceeds 7°C [3] - High temperatures can lead to dehydration, reducing blood volume and increasing blood viscosity, which heightens the risk of stroke [3] Group 2: Vulnerable Populations - High-risk groups for stroke include individuals with pre-existing cerebrovascular conditions, the elderly with vascular hardening, and younger individuals with unhealthy lifestyles [3][4] - The article stresses the importance of recognizing risk factors for stroke prevention, including maintaining hydration and avoiding extreme temperature fluctuations [4] Group 3: Emergency Response - Immediate action is crucial when a stroke occurs, including moving the individual away from extreme temperatures and ensuring clear breathing [4] - The critical window for treatment is between 4.5 to 6 hours post-stroke onset, where timely interventions can significantly reduce disability rates [4]