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Locais de Aferição de Temperatura
Um termômetro mede a temperatura corporal. Os locais comuns para aferir a temperatura corporal são a cavidade oral, região axilar, artéria temporal e…
A temperatura corporal pode ser medida em várias regiões do corpo.
A temperatura corporal superficial é medida nas áreas oral, axilar e temporal, enquanto os locais de temperatura corporal central incluem o reto e a membrana timpânica.
A temperatura oral é medida colocando um termômetro na região sublingual. Como este local está próximo à artéria sublingual, ele detecta variações na temperatura corporal central.
A temperatura axilar é avaliada colocando o termômetro no meio da axila e aduzindo o braço em direção à parede torácica. Este local não é confiável para determinar a temperatura corporal, pois não há vasos sanguíneos importantes por perto.
A temperatura na testa é medida colocando um termômetro sobre a artéria temporal, que emprega tecnologia infravermelha para detectar o calor gerado pela superfície da pele sobre a artéria temporal.
A temperatura da membrana timpânica é medida colocando suavemente uma sonda no canal auditivo e pressionando-a contra o tímpano.
A temperatura retal é obtida inserindo suavemente um termômetro no reto. É considerado um dos métodos mais precisos.
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Q1: What is the difference between surface and core body temperature measurement sites?
Surface body temperature is measured at oral, axillary, and temporal areas using skin or mucosal surfaces. Core body temperature reflects the temperature of internal organs and is measured at the rectum and tympanic membrane. Core sites provide more accurate readings of the body's true internal temperature, while surface sites are more accessible but less precise.
Q2: Why is oral temperature considered a reliable measurement site?
Oral temperature is measured by placing a thermometer in the sublingual region under the tongue. This site is near the sublingual artery, which detects variations in core body temperature accurately. The oral cavity offers reliable readings and can be used on intubated patients, though readings may be affected by recent hot or cold food consumption.
Q3: What are the advantages and limitations of tympanic membrane temperature measurement?
Tympanic membrane temperature uses infrared sensors to detect heat emitted by the eardrum and is considered core body temperature. Advantages include easy accessibility, high accuracy in critically ill patients, and quick measurement. Limitations include measurement variations, the need to remove hearing aids, and potential distortion from ear infections or environmental temperature devices.
Q4: Why is rectal temperature considered one of the most accurate measurement methods?
Rectal temperature is regarded as one of the most precise core temperature measurements because it directly reflects internal body temperature. It is a reliable alternative when oral temperature measurement is difficult. However, disadvantages include potential discomfort, bodily fluid exposure risk, and specific individual limitations that may restrict its use.
Q5: What makes temporal artery temperature measurement practical for clinical use?
Temporal artery temperature measurement uses infrared technology to detect heat from the skin surface over the temporal artery. It is quick, efficient, and requires no major patient repositioning or clothing removal. The method poses minimal risk of harm and does not require sensor covers, making it practical and non-invasive for rapid temperature assessment.
Q6: Why is axillary temperature measurement considered unreliable for determining body temperature?
Axillary temperature is assessed by placing a thermometer in the middle of the axilla with the arm adducted toward the chest wall. This location is unreliable because no major blood vessels are nearby to accurately reflect core body temperature. Axillary measurement also has prolonged measurement periods, lags during rapid temperature fluctuations, and underestimates core temperature.
Q7: What are the advantages of skin surface temperature measurement for newborns?
Skin surface temperature can be measured at the forehead, abdomen, and underarms using adhesive thermometers. Advantages include affordability, continuous reading capability, non-hazardous nature, and suitability for newborns. However, limitations include measurement lags during temperature fluctuations, adhesion problems from sweating, and reduced accuracy affected by environmental temperature.