Why does my baby have a low body temperature after receiving a sedative injection, and what should I do?

Under normal circumstances, low body temperature in infants after administration of sedatives may be caused by factors such as a low ambient temperature, excessive heat loss, malnutrition, hypothyroidism, or ventricular arrhythmia. Symptomatic management may involve general supportive care, medication, and other treatments. If any discomfort occurs, prompt medical consultation is recommended for appropriate treatment under a physician's guidance. Detailed explanations are as follows:

1. Low ambient temperature: If the infant is in a relatively cold environment and the ability to self-regulate body temperature is weakened after receiving sedatives, the infant becomes more susceptible to the effects of ambient temperature. It is recommended to dress the infant in sufficiently warm clothing to reduce heat loss.

2. Excessive heat dissipation: During medical examinations or treatments, the infant may become stressed, and following sedation, may sweat. If perspiration is not promptly wiped away, the evaporation of sweat can remove a significant amount of body heat, causing a drop in body temperature. It is advised to promptly dry the infant's sweat with a soft towel and change into dry, comfortable clothing.

3. Malnutrition: Infants suffering from malnutrition typically have reduced fat and glycogen stores. When malnourished, the infant's body has a diminished capacity to resist a drop in body temperature. After administration of sedatives, metabolic changes and reduced heat production can more easily lead to hypothermia. It is recommended to adjust the diet and switch to an appropriate formula based on the infant's condition to ensure adequate nutrient intake.

4. Hypothyroidism: Thyroid hormones primarily help maintain the body's metabolic rate and temperature. Infants with hypothyroidism inherently produce insufficient thyroid hormones and have a lower metabolic rate. Following sedation, metabolism may be further suppressed, making hypothermia more likely. It is recommended to follow medical advice and use medications such as levothyroxine sodium tablets, potassium iodide tablets, or thyroid extract tablets for treatment.

5. Ventricular arrhythmia: Ventricular arrhythmia can disrupt the heart's pumping function and lead to unstable cardiac output. In infants with ventricular arrhythmia, sedation may affect cardiac electrophysiological activity, worsening arrhythmia and impairing the transport and distribution of body heat, ultimately resulting in a drop in body temperature. It is recommended to follow medical instructions and use medications such as lidocaine hydrochloride injection, amiodarone hydrochloride injection, or propafenone hydrochloride tablets to alleviate symptoms.

It is advisable to regularly monitor the infant's body temperature with a thermometer, observe temperature fluctuations, and stay attentive to the infant's health status.