According to *Zhu Bing Yuan Hou Lun* (General Treatise on the Pathogenesis and Manifestations of All Diseases) regarding the syndrome of sudden death in infants: Sudden death in infants occurs when they are in a state of "Three Deficiencies" and encounter thief-wind (pathogenic wind). Thus, they die suddenly without prior obvious illness. The "Three Deficiencies" refer to: first, encountering a year of declining annual fortune; second, meeting a time of moonless darkness; third, failing to harmonize with the seasonal climate changes. Individuals possessing these three deficiencies, upon being injured by thief-wind, cause Yin Qi to be excessively depleted internally and Yang Qi to be blocked externally. This leads to Qi stagnation and closure, with the interruption of communication between Yin and Yang, resulting in sudden cessation of life. If the Zang-Fu organs have not completely exhausted their essence, revival may occur after a long period. There are also cases involving the interference of ghostly or evil Qi, where survival depends on the retreat of the pathogenic factors. In conditions such as Ke Wu (sudden fright or external pathogenic invasion) and Zhong E (sudden illness due to foul pathogenic qi), if the pathogenic factors remain incomplete after sudden death and stagnate in the heart and abdomen for a long time before manifesting, they often transform into Zhu disease (a chronic, contagious wasting disease).

Master Mao describes the signs of sudden death: eyelids closed, teeth clenched, body flaccid like cotton, face cyanotic and dark, mouth and nose cold. This syndrome arises because the infant had generalized heat since birth, or suffered from convulsions, and physicians only focused on reducing fever without using purgative methods to clear convulsive accumulation or milk accumulation. Consequently, the accumulated pathogens were trapped by evil Qi, leading to this critical condition.

For the aforementioned three syndromes, the general principle is to identify the root cause of the initial pathology. Treatment should urgently employ Duoming San (Life-Saving Powder) to purge, and induce vomiting to expel wind-phlegm (see section on Acute and Chronic Convulsions). After regaining consciousness, administer two doses of Yunqi San (Qi-Balancing Powder) to regulate (see section on Stomach Qi Disharmony). Subsequently, administer Zhusha Gao (Cinnabar Paste) (see section on Convulsion Accumulation) and Zhenxin Wan (Heart-Calming Pill) (see section on All Convulsions) to consolidate recovery. If latent heat arises, use Da Fuzi San (Great Aconite Powder) and provide conditioning care for three to five days for peace (see section on Chronic Convulsions). The three forms described above are managed according to this general principle. However, if symptoms such as crow-like crying, hemiconvulsions, sweat beading like pearls, insomnia, and eyes covered with tears appear, it indicates a fatal prognosis that is untreatable.

*Yingtong Baojian* (Precious Mirror for Infants and Children) Song on the Three Deficiencies of Infants:
When annual fortune declines and the moon is empty,
And seasonal harmony is lost amidst the Five Deficiencies.
Sudden strike by thief-wind leads to sudden death,
Accompanied by ghostly qi, the signs are similar.
If Zang-Fu essence is not yet severed, life can be restored,
Seek medical aid urgently, do not be negligent.

*Jin Gui Yao Lue* (Essential Prescriptions from the Golden Cabinet) formula for saving infants who die suddenly with vomiting, diarrhea, and unknown etiology:
Take a clump of horse manure, wring out the juice, and instill it into the mouth. If fresh manure is unavailable, boil dry manure in water and take the juice.

*Ge Shi Zhou Hou Fang* (Emergency Prescriptions Kept at the Elbow of Master Ge) for saving those who die suddenly with high fever:
Take half a jin of Alum, boil in one and a half sheng of water until dissolved, and soak the feet, submerging them up to the ankles.

*Ge Shi Zhou Hou Fang*, another formula for saving those who die suddenly with closed eyes:
Crush the herb Qiniu Linmian (likely *Allium tuberosum* or related species used topically) and extract its juice, instilling it into the ears.

*Ge Shi Zhou Hou Fang*, another formula for saving those who die suddenly with flaccid limbs and incontinence:
Take one sheng of Niu Dong (cow dung, specifically loose feces), mix with warm wine, and instill into the mouth.

*Qian Jin Fang* (Prescriptions Worth a Thousand Gold) for sudden death characterized by absence of pulse and other signs, caused by exhaustion of both Yin and Yang Qi:
Place Qian Niu Zi (Pharbitis Seed) near the nose for 200 breaths. If a cow licks the patient, recovery is certain. If the cow refuses, apply salt juice to the face to attract the cow.

*Qian Jin Fang*, another formula:
Apply moxibustion or hot compress (using an iron warmer) to the hypochondriac regions bilaterally. (*Bei Ji Fang* notes this also treats Shi Jue/Corpse-Jue).

*Qian Jin Fang* for treating Yan Si (death by nightmare/supernatural oppression) where the patient is unaware:
Ensure careful management of lamps/fire, avoid moving the patient's limbs, and place Qian Niu Zi above the patient to awaken them. If sudden aphasia occurs, take powder from the rooster comb at the East Gate, and administer with wine.

*Qian Jin Fang* for sudden Yan Si:
Crush Chinese chive (*Jiu Cai*) to extract juice and instill into the nostrils. For severe cases, instill into both ears. (Zhang Zhongjing states: instill into the mouth.)

*Qian Jin Fang* for supernatural oppression causing unconsciousness:
Powder Fu Long Gan (Caosinis Cauda/Fireplace Earth) and blow it into the nostrils.

*Qian Jin Fang*, another formula:
Powder Zao Jia (Gleditsia Sinensis Fruit) to the size of soybeans, blow into the nostrils. Sneezing will restore Qi flow and revive the deceased. (*Ji Yan Fang* uses this for Zhong E).

*Tai Ping Sheng Hui Fang* (Holy惠民 Formulas of the Taiping Era) for pediatric sudden death:
Take half a qian of Nu Qing powder, mix with cow's milk, and administer orally.

*Tai Ping Sheng Hui Fang*, another formula:
Burn pig manure, dissolve in water, and administer the juice.

*Tai Ping Sheng Hui Fang*, another formula:
Boil Ku Shen (Sophora Root) in vinegar to obtain a small amount of juice, place in the mouth for revival. Boiling in water is also acceptable. Alternatively, boil coffin wood boards in wine, take the juice, and administer a small amount.

*Tai Ping Sheng Hui Fang*, another formula:
Prepare extremely salty brine, pry open the mouth with a tool, and instill the liquid. Once it enters the stomach, the patient will live.

*Tai Ping Sheng Hui Fang*, another formula:
Mix hot water with plant ash, apply thickly over the body. Revival will occur shortly.

*Ying Ru Shu* (Book for Infants and Toddlers) for infants dying suddenly from unknown causes:
Cut the comb of a male chicken, hold it above the infant's mouth to collect blood, and drip the blood into the mouth for immediate revival.

*Ge Shi Zhou Hou Fang* Moxibustion Method: For sudden death with flaccid limbs and incontinence, moxa-burn points located one cun below the heart, three cun above the umbilicus, and four cun below the umbilicus, each 100 moxa cones. For smaller children, adjust the number of cones according to age.

*Qian Jin Fang* for sudden death: Needle Jian Shi (PC5) for over 100 breaths.

*Qian Jin Fang* Moxa-burn Ren Zhong (GV26), located below the nose. Also known as Gui Ke Ting (Ghost Guest Hall). (*Zhou Hou Fang* notes this also treats Shi Jue).