DEVELOPMENT OF THERMOREGULATION MODEL OF SURGERY PATIENT AND ITS HEAT EXCHANGES TO AIR CONDITION IN THE OPERATING ROOM

• Main Author: Dinda Rinata, Addin
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/44865
• Institution: Institut Teknologi Bandung

In general, the air condition of operating room is relatively cool enough to serve the needs of thermal comfort for medical personnel. Whereas the anesthetized patients require higher ambient temperatures to maintain core body temperature at normal conditions. The lower ambient temperature will increase heat loss from patient’s body and cause reduction of the core body temperature. The thermoregulation of patient may continue to decline if no action is taken to maintain core body temperature during operation. This study was conducted to evaluate the response of body anesthetized patients on changes in variable ambient conditions. The model of thermoregulation is developed based on the condition of normal body to determine the distribution of core body temperature and on its surfaces. This study has been carried out modeling of normal body thermoregulation and body surgery patients. Normal body modeling was conducted by simulation and direct measurement in the test room. Whereas to model patient’s body had just been done simulations without direct measurement of the patient’s body. This modeling is based on modification of the Pennes models, known as bioheat equation. Modifications have been made by applying the ratio of the rate of blood perfusion anesthetized patients to a normal body that is equal to 0,5. The model of the body are approached by spherical and cylindrical shapes, divided into 8 segmentsas refers on Fiala models. Body thermoregulation modeling performed with computational simulations using Finite Element Methods – FEM. The heat exchange by convection, radiation, and evaporation are occur on top surface of the body that is equal to 50% of total body surfaces. The rest 50% on the bottom surface is an insulated surface. Model validation conducted on normal body from direct measurement. Model simulations conducted during 30 minutes with applying time dependent conditions. The ambient temperature is set to be constant for each simulation at 21°C, 23°C, and 25°C while the air velocity on the body surface is set at 0,2 m/s and 0,4 m/s. Results of simulation show that the temperature on the top surface of the body are 33,4oC, 33,8oC and 34,15oC respectively. The lower ambient temperature around the body of the patient anesthetized, the patient’s body surface temperature will decrease.