Thunderstorm suddenly, hold up an umbrella to cover the rain, running wildly to find a tile to cover the head …… these seemingly natural actions, but you may become a lightning “target”. In recent times, the weather in Guangdong is very “cranky”, moving day and night, rain and wind, lightning and thunder. In addition to the inconvenience to the public travel, but also to health, and even life threatening, frequent lightning casualties. We can’t stop the lightning and thunder, but a little common sense will help you not to be “thundered”! a. Pacemaker users Dr. Fang Xianhong, chief physician of the Department of Cardiology at Guangdong Provincial People’s Hospital, reminds patients using pacemakers that it is best not to go out during thunderstorms, even if they stay indoors, they should stay away from metal doors and windows. An artificial pacemaker consists of a pulse generator and a metal wire connected to it, which can stimulate the heart with a certain form of artificial pulse current to produce a rhythmic contraction. Pacemakers are mainly used to treat slow arrhythmias, giving pacing therapy when one’s own heartbeat is slow. Because when lightning strikes, strong electromagnetic fields and high voltage currents are generated, which interfere with the normal work of the pacemaker. Especially when the lightning area is close (hearing thunder within 3 seconds after seeing lightning and estimating that the lightning area is within 1000 meters) and when staying outdoors, some patients may feel discomfort, such as panic, and a few patients may experience a transient failure of their pacemaker, although this lasts for a short period of time. If you have longer-term discomfort, you need to follow up the pacemaker function at the hospital in time. b. Patients with cardiovascular disease Around the arrival of thunderstorms, the weather is often very muggy, with low air pressure and low oxygen content in the air. Most people experience discomfort in such weather, which can generally be tolerated by normal people. However, patients with cardiovascular diseases, especially those with atherosclerosis and narrowed blood vessels, will be particularly sensitive to such weather. In addition, the hot weather will induce sympathetic excitement, making people feel irritable, heart speed up, blood pressure rise, for people who have coronary heart disease easily induced angina, myocardial infarction, and even arrhythmia, leading to sudden death. Dr. Fang Xianhong, chief physician, especially reminded that the recent frequent thunderstorms, cardiovascular disease, especially coronary heart disease patients, it is best to always have nitroglycerin at home, if the chest tightness, chest pain and other discomfort, immediately sublingual, under normal circumstances after taking the drug 1 to 2 minutes of discomfort can be relieved, if more than 5 minutes still can not be relieved, you should immediately go to the hospital to prevent myocardial infarction.