What Is a Postoperative Fever?

The main causes of non-infectious fever: long operation time (2 hours), extensive tissue damage, intraoperative blood transfusion, drug allergy, liver poisoning caused by anesthetic (halothane or enflurane), etc.

Postoperative fever

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Fever is the most common symptom after surgery. About 72% of patients have a temperature above 37 ° C and 41% have a temperature above 38 ° C. Postoperative fever generally does not necessarily indicate infection. Non-infectious fever usually precedes infectious fever (mean 1.4 and 2.7 days after surgery, respectively).

Affected area

whole body

Related diseases

Postoperative pneumonia and posttraumatic pneumonia, cholecystectomy, syndrome, urinary tract infections, drug allergies, neonatal fever, phlebitis, reflux gastritis, diabetes, pericardiotomy, postoperative syndrome, and cardiac disease

Related symptoms

Cancerous fever non-infectious fever hepatosplenomegaly high fever chill lymphadenopathy anemia fever central fever

Affiliated Department

Surgical Infectious Diseases

Related inspections

Regression thermorespirator (BR) Hepatitis A antibody Hepatitis A antigen Hepatitis A virus antigen (HAVAg) Basal metabolism

The main causes of non-infectious fever: long operation time (2 hours), extensive tissue damage, intraoperative blood transfusion, drug allergy, liver poisoning caused by anesthetic (halothane or enflurane), etc.

Risk factors for infectious fever include frailty, advanced age, poor nutritional status, diabetes, smoking, obesity, use of immunosuppressive drugs, or pre-existing infections. Surgical factors include inadequate hemostasis, residual dead space, and tissue trauma. The neglect of the proposed preventative antibiotics is also a factor.

Infectious fever In addition to wounds and other deep tissue infections, other common causes of fever include pulmonary insufficiency, pneumonia, urinary tract infections, chemical or non-chemical phlebitis.

High fever (39 ° C) occurs in the first 24 hours after surgery. If transfusion reactions can be ruled out, consider streptococcus or clostridia infection, aspiration pneumonia, or pre-existing infections. There are often cold feelings and even chills. At this time, the body temperature has risen, and the skin temperature is low due to the contraction of small blood vessels, which stimulates the cold sensory skin of the skin and causes the cold feeling.

Infectious fever has the following characteristics:

1 case of fever with or without chills.

2 Systemic and localized symptoms and signs.

3 blood: white blood cell count is higher than 1.2x109 / L, or lower than 0.5109 / L.

4 Tetrazolium blue test (NBT): If the neutrophil reduces NBT by more than 20%, it indicates that there is a bacterial infection, which is helpful to distinguish it from viral infection and non-infectious fever (normal value 10%). False negative.

5C reactive protein assay (CRP): Positive indicates bacterial infection and rheumatic fever, and negative is mostly viral infection.

6 Increased neutrophil alkaline phosphatase integral: The normal value is 0 to 37. The higher the increase, the better the diagnosis of bacterial infection. It is more meaningful when excluding pregnancy cancer and malignant lymphoma. After application of hormones, it can be raised or false positive.

Non-infectious fever has the following characteristics:

1 The heat path is longer than 2 months. The longer the heat path, the more likely it is.

2 Long-term fever is generally good, without obvious symptoms of poisoning.

3 Anemia, painless multi-site lymphadenopathy, hepatosplenomegaly causing central fever are cerebrovascular disease, brain trauma, and brain surgery invasion. It is also common in brain tumors, epilepsy, alcohol withdrawal, and Acute high intracranial pressure. In addition, some scholars classify malignant hyperthermia and neuroleptic malignant syndrome as a type of temperature regulation disorder.

Cancerous fever refers to non-infectious fever directly related to cancer that occurs in cancer patients in the absence of infection and ineffective antibiotic treatment, and fever caused by treatment during the development of tumors.

High fever (39 ° C) occurs in the first 24 hours after surgery. If transfusion reactions can be ruled out, consider streptococcus or clostridia infection, aspiration pneumonia, or pre-existing infection.

If the body temperature does not exceed 38 ° C, it can be left untreated. Above 38.5 , when the patient feels discomfort, he can be physically cooled, treated symptomatically, and observed closely. Drink plenty of water, you can switch to fruit juice and the like if you do nt want to drink water; eat digestible food, while the hospitalization is based on porridge, soup, noodles;