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Sitios de medición de temperatura
Un termómetro mide la temperatura corporal. Los sitios comunes para medir la temperatura corporal son la cavidad bucal, la región axilar, la arteria t…
La temperatura corporal se puede medir en varias regiones del cuerpo.
La temperatura corporal superficial se mide en las áreas oral, axilar y temporal, mientras que los sitios de temperatura corporal central incluyen el recto y la membrana timpánica.
La temperatura oral se mide colocando un termómetro en la región sublingual. Como este sitio está cerca de la arteria sublingual, detecta variaciones en la temperatura corporal central.
La temperatura axilar se evalúa colocando el termómetro en el centro de la axila y aduciendo el brazo hacia la pared torácica. Esta ubicación no es confiable para determinar la temperatura corporal, ya que no hay vasos sanguíneos importantes cerca.
La temperatura en la frente se mide colocando un termómetro sobre la arteria temporal, que emplea tecnología infrarroja para detectar el calor generado por la superficie de la piel sobre la arteria temporal.
La temperatura de la membrana timpánica se mide colocando suavemente una sonda en el canal auditivo y presionándola contra el tímpano.
La temperatura rectal se obtiene insertando suavemente un termómetro en el recto. Se considera uno de los métodos más 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.