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]

Core Viewpoint - The article highlights the ongoing extreme heat wave affecting multiple regions in China, with temperatures exceeding 35°C and reaching as high as 40°C in certain areas, prompting health risk warnings and advisories for the public [1][2][4]. Group 1: Heat Wave Impact - The Central Meteorological Observatory issued a yellow warning for high temperatures, predicting daytime highs above 35°C in regions including southern North China, Huanghuai, Jianghuai, Jianghan, and much of Jiangnan [1]. - Specific areas such as the Turpan Basin in Xinjiang, northern Shandong, and central-northern Henan may experience temperatures exceeding 40°C [1]. Group 2: Health Risk Warnings - The National Disease Control and Prevention Bureau, in collaboration with the China Meteorological Administration, has issued continuous high-temperature health risk warnings, advising the public to avoid outdoor activities during peak heat hours and ensure adequate hydration [2]. - The high-temperature health risk warning differs from regular high-temperature warnings by focusing on the potential health impacts of elevated temperatures, categorizing risks into five levels: low, moderate, high, and extremely high [2][4]. Group 3: Symptoms and Emergency Measures - Symptoms of heat-related illnesses include dizziness, thirst, fatigue, and elevated body temperature above 38°C, indicating potential heat stroke [5]. - In cases of severe symptoms such as a body temperature exceeding 40°C, confusion, and rapid heart rate, immediate medical attention is required [7][9].

Core Viewpoint - Stroke, commonly known as cerebrovascular accident, is a leading cause of death and disability among residents in China, with high temperatures also posing a significant risk for stroke occurrence [1][2]. Group 1: Stroke Types and Risks - Stroke is categorized into ischemic and hemorrhagic types, with acute ischemic stroke (acute cerebral infarction) accounting for approximately 70% of cases [3]. - High temperatures, particularly above 32°C, significantly increase the risk of stroke, with the danger escalating as temperatures rise [1][4]. Group 2: Factors Contributing to Stroke in High Temperatures - Dehydration: High temperatures lead to excessive sweating and fluid loss, increasing blood viscosity and slowing blood flow, which raises the risk of ischemic stroke [4]. - Blood Pressure Fluctuations: Heat causes blood vessels to dilate, potentially lowering blood pressure, but can also lead to erratic blood pressure changes due to environmental stressors, increasing the risk of hemorrhagic stroke [4]. - Thermoregulation Burden: The body's effort to cool down increases heart rate and cardiac workload, which may affect cerebral blood supply [4]. Group 3: Recognizing and Responding to Stroke - Early warning signs include dizziness and limb numbness, which are critical indicators of a potential stroke [5]. - The "120 Rule" for quick identification of stroke symptoms involves observing facial symmetry, checking arm strength, and listening for clear speech [6]. Group 4: Common Missteps in Emergency Response - Avoid moving the patient abruptly, as this can worsen bleeding [8]. - Do not shout at the patient, as loud noises can elevate blood pressure and exacerbate the condition [9]. - Refrain from administering medication without a clear diagnosis, as incorrect medication can worsen symptoms [10]. - Do not feed or give drinks to the patient, as this can lead to choking and interfere with timely medical intervention [11]. Group 5: Misconceptions about Stroke Treatment - Immediate medical attention is crucial, and the golden window for effective treatment is within 4.5 hours of symptom onset [13]. - It is a misconception that stroke patients should be taken to distant hospitals; local hospitals can often provide adequate emergency care [13]. - Young and middle-aged individuals are also at risk for stroke due to unhealthy lifestyles, including hypertension and obesity [15].