Pulmonary embolism is a clinically critical condition with an elegant but hideous name – Slience Killer, and the global disease death statistics are so cruel that tumor is the first, heart attack is the second and pulmonary embolism is the third. I like to compare the heart to an engine, and the pulmonary artery is a fragile part of the cardiopulmonary circulation. As the picture above shows, once it is blocked by a foreign body, without the mixture of air and blood, the engine immediately stalls, and the danger is self-evident. The good news is that medical advances have reduced the mortality rate from 25 percent before treatment to about 5 percent for patients treated immediately. But the doctor’s vocation will not be satisfied with this, we want to further reduce, what to do? 1.The causes of thrombosis Vascular doctors are aware of the three major factors of classic thrombosis-hypercoagulable state, slow blood flow, and vascular injury. I have seen various strange triggers of thrombosis in the clinic, such as playing mahjong all day, sitting on the train for several days, lying down on the road overnight after drunkenness, varicose veins treated with bloodletting, acupuncture and massage, playing computer with legs crossed, judo masters who accidentally sprained their ankles, etc. All these triggers can be classified as one of the three major factors. Clinical patients of obstetrics and gynecology, orthopedic surgery, obese people, tumor patients and some elderly bedridden patients also belong to the high-risk group. 2, the source of pulmonary embolism embolism pulmonary embolism more than 90% of the embolism originated from the lower leg. Accelerating blood flow is the simplest and most effective way to reduce the occurrence of thrombosis. I think I urge patients to exercise four times a day in order to prevent the possibility of thrombosis in bedridden or postoperative patients, and demonstrate hand to hand (should be hand to foot), just to reduce the probability of thrombosis. Exercise is easy for healthy people, and it is not difficult to walk directly on the ground. However, for patients who are not able to walk on the floor and have motor impairments, such as pregnant women, obese people, hemiplegics and post-operative patients, how can they exercise in the hospital bed? Don’t worry, Dr. Smile offers you the easiest and most effective way – ankle flexion and extension exercises. If you are a doctor or nurse and you meet someone with high thrombotic factors, especially in the presence of dehydration or post-operative patients, don’t just tell to get down early and exercise more, it is not enough, tell him/her a more definite way of exercise instruction. If you are a gynecologist, be sure to tell the new mother to move her calves and belly, even if it means demonstrating by hand, and maybe you will not leave a child without a mother. If you are a pregnant woman, the process of conceiving life, regardless of cesarean or normal delivery, must do this action, if the elderly told you to bed rest to sit on the moon, bravely say no, health is largely in your own hands. If you feel too little space in any cramped transport, don’t worry, calf belly move, perhaps invisible you have been lucky to escape the silent killer.