Literature establishes that warming with a heated blanket before and during the operation is effective in the prevention of perioperative hypothermia, both in general anesthesia as well as spinal anesthesia. However, the trials have still not presented us with objective protocols to standardize this routine in the surgical centers.

The study aims to assess the adoption and reproduction of the implementation of the warning device by the nursing team immediately after the patient's entrance in the operating room, even before the entrance of the anesthesiologist.

After approval by the Institutional Research Ethics Committee, the patients for elective surgeries to be submitted to general and spinal anesthesia lasting 60 minutes or more held at the central operating center at Santa Casa de Misericórdia in São Paulo will be assessed over a period of 60 days. The patients will receive the necessary explanations on the research and, after obtaining the responsible consent for participating in the trial, they will be included.

Inclusion/exclusion criteria:

Inclusion - adults that will be submitted to general or spinal anesthesia in the central operating center at Santa Casa de Misericórdia in São Paulo.

Exclusion:

• Patient over 18 years old;
• Patients that are feverish/present with infectious symptoms
• Refusal of the use of the device by the patient
• Patient that does not tolerate the use of the blanket in the pre op. The study aims to assess over a period of 60 days the compliance to the protocol and the prewarming time with the use of the heated air flow device from the moment the patients enter the operating room until anesthesia induction. The heating device will be set up connected to the patient and to the motor with the activation of the system at 43°C by the nursing team. The monitoring of the times since the entrance of the patient in the operating room until the induction of the anesthesia will be controlled by a member of the anesthesia team (regardless of the room process).

All the patients scheduled with elective surgery predicted to last over 60 minutes will be selected and there will be an assessment of the number of cases in which the protocol was followed and the time of use of the warming device will be monitored from the installation entrance in the OR and before the anesthesia induction and every 30 minutes beginning of anesthesia, during the surgery until the end of the anesthetic procedure.

The variables to be assessed in the study are:

• Age, gender, weight, height, body mass index (BMI), diseases, physical condition according to the American Anesthesiology Association classification;

• Oral temperature measured at the following points:

  • M-entrance - entering the room and installation of the blanket
  • M-ind - from the moment after the induction of anesthesia;
  • M30, M60, M90, M120 = 30, 60, 90, 120 min after induction till the end of the anesthetic procedure; and the patients scheduled to general anesthesia will be also measured with esophagus thermometer

• The protocol establishes the types of warm blankets available to be used for the different types of surgery;

• Arterial oxygen saturation; heart beat; systolic and diastolic pressure and carbon dioxide expired:

  • At the entrance of the operating room;
  • Immediately after induction;
  • Every 30 minutes after induction until the patient leaves the operating room;

• The type of surgery and anesthesia will be assessed among the pre-warming groups

• Room temperature will be measured (at the entrance of the patient and after induction and at the end of surgery/anesthesia;

• Presence of side effects. The need of blood transfusion will be assessed during surgery. There will be statistical assessment of the results, the significant statistical difference will be p<0.05.

Inclusion Criteria:

• Adults that will be submitted to general or spinal anesthesia in the surgical center of hospital central at Santa Casa de Misericórdia in São Paulo

Exclusion Criteria:

• Patient under 18 years old;
• Patients that are feverish/present with infectious symptoms
• Refusal of the use of the device by the patient
• Patient that does not tolerate the use of the blanket in the pre op.