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]