成州团练使张锐字子刚以医知名居于郑州政和中蔡鲁公之孙妇有娠及期而病国医皆以为
阳证
伤寒惧胎之堕不敢投凉剂鲁公密邀锐视之锐曰儿处胎十月将生矣何药之能败即以常法与药且
使
倍服之半日而儿生病亦失去明日妇大泄而喉闲不入食众医复指言其疵且曰二疾如冰炭又产蓐
甫近虽扁鹊复生无活理也锐曰无庸忧将使即日愈乃入室取药数十粒使吞之咽喉即通下泄亦止
逮盈月鲁公开宴自诸子诸孙及女妇甥婿合六十人请锐为客公亲酌酒为寿曰君之术通神吾不敢
知敢问一药而治二疾何也锐曰此于经无所载特以意处之向者所用乃附子理中丸裹以紫雪尔方
喉闭不通非至寒药不为用既已下咽则消释无余其得至腹中者附子力也故一服而两疾愈公大加
叹异尽敛席上金匕箸遗之刑部尚书慕容彦逢为起居舍人母夫人病亦召锐于郑至则死矣时方六
月暑将就木锐欲入视彦逢不忍意其欲求钱乃曰道路之费当悉奉偿实不烦入锐曰伤寒法有死一
昼夜复生者何惜一视之彦逢不得已自延入悲哭不止锐揭面帛注视呼仵匠语之曰若尝见夏月死
者面色赤乎曰无然而汗不出而蹶尔不死也幸无亟敛趋出取药命以水二升煮其半灌病者戒曰善
守之至夜半大泻则活矣锐舍于外馆至夜半时守病者觉有声勃勃然遗屎已满席出秽恶物斗余一
家尽喜遽敲门呼锐锐应曰吾今日体困不能起然亦不必起明日方可进药也天且明出门若将便旋
然径命驾归郑彦逢诣其室但留平胃散一帖而已其母服之数日良愈盖锐以彦逢有求钱之疑故不
告而去绍兴中流落入蜀王 叔坚问之曰公之术古所谓十全者几是欤曰未也仅能七八耳吾长子
病诊脉察色皆为热极命煮承气汤欲饮之将饮复疑至于再三将遂饮如有掣吾肘者姑持杯以待儿
忽发颤悸覆绵衾至四五始稍定汗下如洗明日而脱然使吾叶入口则死矣安得为造妙世之庸医学
方书未知万一自以为足吁可惧哉(夷坚志)
成州团练使张锐，字子刚，凭借医术闻名。他居住在郑州。政和年间，蔡鲁公的孙媳妇怀孕到了预产期却患病，太医院的医生们都认为是阳证伤寒（感受热邪所致的伤寒病），担心胎儿流产，不敢使用寒凉药物。蔡鲁公秘密邀请张锐来诊治。张锐说：“胎儿在母体内十月即将出生，什么药能导致失败呢？”于是按照常规方法给药，并且让患者加倍服用。半天后，婴儿生病也夭折了。第二天，产妇出现严重腹泻，且咽喉阻塞无法进食。其他医生又指责他的失误，并说这两种疾病如同冰炭般性质相反，而且产妇刚临产不久，即使扁鹊复生也没有救治的道理。张锐说：“不用担忧，我将让她当天痊愈。”于是进入房间取出几十粒药丸让患者吞服，咽喉随即通畅，腹泻也停止了。等到满月时，蔡鲁公设宴，从各个儿子、孙子到女儿、儿媳、外甥女婿共六十人，请张锐作客。蔡鲁公亲自斟酒祝寿说：“您的医术通神，我不敢妄知，敢问一种药治愈两种疾病，为什么呢？”张锐说：“这在经典中没有记载，只是凭心意处置。先前所用的是附子理中丸包裹以紫雪。当时咽喉闭塞不通，非至寒药物不能起效；既然已经咽下，紫雪便消散无余，能到达腹中的是附子的药力。所以一服药而两种疾病都好了。”蔡鲁公大为赞叹惊奇，将席上所有的金匙银筷都赠送给他。
刑部尚书慕容彦逢担任起居舍人时，其母亲生病，也从郑州召请张锐。张锐到达时，病人已经去世。当时正值六月暑天，准备入殓。张锐想要进去查看病情，慕容彦逢不忍心，猜想他是想求钱财，就说：“路途费用应当全部偿还，实在不必进去。”张锐说：“伤寒法中有死后一昼夜又复活的案例，为什么吝惜让我看一眼呢？”慕容彦逢不得已，只好延请他进入。张锐看到家属悲痛哭泣不止，揭开面巾注视病人，呼唤仵作对他说：“你曾见过夏天死去的人面色红润吗？”仵作说：“没有。然而病人不出汗且四肢厥冷，这不是死亡啊。幸好不要急于收敛。”张锐快步出来取药，命令用两升水煮取半升，灌喂病人，并嘱咐道：“好好看护她。到了半夜如果大泻，就能活命了。”张锐住在馆舍里。到了半夜，看护病人的人觉得有声音蓬勃而出，排泄物已铺满席子，排出恶臭污物一斗多，全家都非常高兴，急忙敲门呼叫张锐。张锐回应说：“我今天身体困倦，不能起床，但也无需起身，明天才可以进药。”天快亮时，出门好像要方便，却径直命令驾车返回郑州。慕容彦逢去他的住处，只留下一帖平胃散而已。他的母亲服用几天后痊愈。大概是因为慕容彦逢有求钱的嫌疑，所以不告而别。
绍兴年间，张锐流落流入蜀地。王叔坚问他：“先生的医术，古所谓‘十全’（十次治疗十次成功）的情况有多少呢？”回答说：“还没有达到，仅能七八成罢了。”“我的长子生病，诊脉察色都显示为热极，命令煮承气汤（攻下热结的方剂）想要给他喝。将要喝时又怀疑，以至于再三犹豫，将要最终饮用时，好像有人拉扯我的手臂阻止我。姑且拿着杯子等待，儿子忽然发生颤抖惊悸，盖上绵被到四五次才稍微安定，汗出如洗，第二天就完全康复了。如果我让药叶入口，他就死了。怎么能说是妙手回春？世间的庸医学习方书，不知道其中万一，自以为满足，唉，真是可怕啊！”（出自《夷坚志》）
Zhang Rui, Military Instructor of Chengzhou, courtesy name Zigang, was renowned for his medical skills and resided in Zhengzhou. During the Zhenghe era, the granddaughter-in-law of Duke Cai Lu fell ill at her expected delivery date. Physicians from the Imperial Medical Bureau diagnosed it as Yang-pattern Shanghan (Cold Damage characterized by heat syndromes) and, fearing miscarriage, dared not administer cooling agents. Duke Cai Lu secretly invited Zhang Rui to examine the patient. Zhang Rui stated, "The fetus has been in the womb for ten months and is about to be born; what medicine could cause failure?" He then prescribed medication according to standard methods and instructed the patient to double the dosage. Half a day later, the infant became ill and died. The following day, the woman suffered severe diarrhea and throat obstruction preventing food intake. Other physicians pointed out this error, stating that these two ailments were as contradictory as ice and charcoal, and since she had just given birth, even if Bian Que were reborn, there would be no hope of survival. Zhang Rui said, "Do not worry; I will cure her on the same day." He entered the room, took dozens of pills, and had her swallow them. Her throat immediately cleared, and the diarrhea stopped. By the full month postpartum, Duke Cai Lu hosted a banquet inviting sixty guests, including sons, grandsons, daughters, daughters-in-law, nephews, and sons-in-law, with Zhang Rui as the honored guest. The Duke personally poured wine to toast him, saying, "Your medical skill is divine. I dare not presume to understand, but may I ask how one medicine cured two different diseases?" Zhang Rui replied, "This is not recorded in the classics; it was my own judgment. What I used previously was Fuzi Lizhong Wan (Aconite Pill to Regulate the Middle) wrapped in Zixue (Purple Snow). At that time, the throat was blocked; only a supreme cold agent could resolve it. Once swallowed, the Zixue dissipated completely, while the power of Aconite reached the abdomen. Thus, one dose cured both ailments." The Duke greatly admired this, presenting him with all the golden spoons and chopsticks from the table.
When Murong Yanfeng, Minister of Justice, served as Attendant Gentleman of the Secretariat, his mother fell ill, and he summoned Zhang Rui from Zhengzhou. Upon arrival, the patient had already passed away. It was June, hot weather, and preparations for burial were underway. Zhang Rui wished to enter and examine the body. Murong Yanfeng, unwilling and suspecting Zhang sought money, said, "Travel expenses will be fully compensated; there is truly no need to enter." Zhang Rui said, "Shanghan protocols mention cases of revival after death within twenty-four hours. Why hesitate to let me look?" Reluctantly, Murong Yanfeng allowed him entry. Seeing the family weeping uncontrollably, Zhang Rui lifted the face cloth, observed the patient, and called the coroner, asking, "Have you ever seen someone who died in summer with a ruddy complexion?" The coroner replied, "No. However, the patient has no sweat and cold extremities; this is not death. Fortunately, do not hurry to bury." Zhang Rui quickly exited, retrieved medicine, ordered two sheng of water boiled down to half a sheng, and administered it to the patient, instructing, "Guard her well. If she has a profuse stool at midnight, she will survive." Zhang Rui stayed at an inn. At midnight, the caregiver heard a vigorous sound; feces covered the mat, expelling over a dou of foul matter. The family rejoiced and knocked urgently to call Zhang Rui. He responded, "My body is weary today; I cannot rise, nor is it necessary. Medication can begin tomorrow." As dawn approached, he went out as if to relieve himself but instead ordered his carriage back to Zhengzhou. When Murong Yanfeng visited his residence, only one packet of Pingwei San (Calm the Stomach Powder) remained. His mother took it for several days and recovered well. Presumably, due to Murong's suspicion of greed, Zhang Rui left without explanation.
During the Shaoxing era, Zhang Rui drifted into Shu. Wang Shujian asked him, "How often does your skill achieve the ancient ideal of 'ten successes out of ten'?" He answered, "Not yet; only seven or eight times out of ten." "My eldest son fell ill. Pulse diagnosis and observation indicated extreme heat. I ordered Chengqi Tang (Chengqi Decoction) to be boiled for him. As I was about to give it, doubt arose, causing hesitation. Just as I was about to administer it, it felt as though someone pulled my arm to stop me. I held the cup and waited. Suddenly, the child trembled and palpitated. After covering him with cotton blankets four or five times, he stabilized slightly, sweating profusely. The next day, he recovered completely. Had I forced the medicine down his throat, he would have died. How can one claim miraculous healing? Mediocre doctors study formularies, knowing but a fraction, yet consider themselves sufficient. Alas, this is terrifying!" (From *Yijian Zhi*)