The Importance of Body Temperature Probes in Severe Heatstroke Cases

With global warming, extreme heatwaves are becoming increasingly frequent. The probability of severe heatstroke skyrockets in high-intensity situations such as marathons, military training, and outdoor work. Furthermore, heatstroke can also occur silently in hot and humid indoor environments, especially when sitting still for extended periods in poorly ventilated rooms without air conditioning. In such environments, elderly people with underlying health conditions and infants with weaker thermoregulation often face a higher risk of heatstroke.

Heatstroke, medically known as heat exhaustion, is the most severe form of heat-related illness. Compared to other heat-related injuries, its progression is more rapid. Dizziness, lightheadedness, weakness, clumsiness and poor coordination, fatigue, headache, blurred vision, muscle pain, nausea, and vomiting are common warning symptoms of heatstroke. However, due to brain dysfunction caused by heat damage, patients are often in a state of confusion and may be unable to perceive that their body temperature is dangerously high. If heatstroke is not detected and treated promptly, the large amount of heat trapped in the patient's body cannot be released, leading to irreversible and severe damage to vital organs such as the heart, kidneys, liver, and brain, resulting in an extremely high mortality rate.

In life-or-death rescues, measuring the patient's core body temperature is a prerequisite for effective cooling, which is why ordinary forehead thermometers and other temperature measurement methods are inadequate. Firstly, when a person suffers from exertional heatstroke, due to extreme dehydration and severe vasoconstriction, the patient's skin often appears cold and clammy. In this case, measurements taken with a forehead or ear thermometer may show completely normal results. This phenomenon of "low surface fever and high internal fever" easily leads to misdiagnosis and delays precious rescue time. Secondly, during the emergency treatment process before transporting a patient to the hospital for heatstroke, medical personnel will quickly employ physical measures such as ice packs and evaporative cooling with fans. These measures will cause the patient's peripheral skin temperature to drop sharply, even below normal body temperature. Therefore, it is not clinically recommended to measure the core body temperature of hospitalized patients using surface temperature measurements (such as those from the ear canal, mouth, tympanic membrane, axilla, and temporal region) because these methods cannot accurately reflect the true heat load within the body and are seriously misleading.

To address this clinical challenge, the medical community's generally accepted solution is to use specialized temperature probes inserted deep into the body for invasive core temperature monitoring. Among various parts of the body, esophageal temperature best represents the blood temperature of the heart and brain and responds rapidly to acute temperature changes, making it an ideal method for core temperature measurement. However, measuring esophageal temperature is complex and requires highly specialized equipment and skilled operation. In contrast, rectal temperature probes are less invasive, easier to measure, and provide a good reflection of the temperature of vital abdominal organs. To obtain the most accurate and closest-to-core standard temperature, a specialized temperature probe should be inserted 15 cm deep into the anus. In this way, the high-performance temperature probe reduces interference from external cooling measures such as ice packs and fans on the skin, transmitting real-time and accurate data (up to 40°C) to the main monitoring system.

Severe heatstroke progresses rapidly after onset and is often accompanied by functional damage to multiple organs. Before the condition stabilizes, the patient must have their core body temperature continuously monitored using an indwelling temperature probe, or have the probe read and record data at least every 10 minutes, until the core body temperature safely drops below 38.5°C. This continuous dynamic monitoring not only prevents the continued aggravation of heat damage due to insufficient cooling but also avoids fatal hypothermia or arrhythmia caused by excessive cooling.

The threat of heatstroke should not be underestimated, especially for the elderly with underlying diseases, infants, young children, the frail or bedridden, and special populations with hypohidrosis, severe skin diseases, or other thermoregulation disorders. In summer, when temperatures exceed 30°C, actively using air conditioning to lower indoor temperatures and avoiding prolonged stays in small, enclosed spaces are the first line of defense against heatstroke. In the unfortunate medical treatment of severe heatstroke, continuous core body temperature tracking using high-precision temperature probes is a crucial measure to safeguard life.