Etiotropic therapy
The etiotropic principle of therapy is the absolute foundation of medical care in all forms of overheating. Its primary and foremost task is the immediate cessation of the action of provocative factors on the victim.
In clinical practice, this means that the patient must first be completely isolated from the source of high ambient temperature. However, simply moving them to a cool place is often not enough. Concurrently, medical personnel or first responders are obligated to eliminate any external barriers that act as factors inhibiting the body's natural heat dissipation. It is important to understand that without the full implementation of this initial stage, all subsequent therapeutic measures will be largely ineffective, as the pathogenic thermal agent will continue to deplete compensatory reserves.
Pathogenetic treatment: normalization of functions and homeostasis
Pathogenetic treatment sets two global goals for the clinician: reliable blockade of key pathogenetic links and active stimulation of the body's own adaptive processes. To successfully achieve these goals, a strictly verified, comprehensive approach divided into several directions is applied.
The first direction is the normalization of vital functions. Medical interventions here are aimed at stabilizing the cardiovascular system (CVS) and the external respiration apparatus, which are the first to take the brunt during overheating. It is extremely critical to restore adequate blood gas composition. Concurrently, thorough correction of emerging metabolic disorders is carried out, and the neurohumoral regulation of sweat gland activity is adjusted.
The second direction is the elimination of homeostatic shifts. Prolonged overheating inevitably causes a severe cascade of physicochemical changes in the internal environment. Strict monitoring and correction of the hydrogen ion exponent (pH), as well as normalization of blood osmotic and oncotic pressure indices, are required. Special attention is paid to restoring an adequate circulating blood volume (CBV), targeted reduction of its pathological viscosity, and stable stabilization of blood pressure (BP).
Detoxification and symptomatic care
The third most important component of pathogenetic intervention is detoxification of the body. When hyperthermia develops, metabolic disorders inevitably lead to the accumulation of waste products in tissues. Detoxification tactics necessarily include the administration of plasma volume expanders. This not only effectively replenishes the lost fluid volume but also dilutes the concentration of circulating harmful substances. Additionally, stimulation of the renal excretory function is performed—this forces the natural elimination of toxic compounds that intensively form during hyperthermic states.
In turn, the symptomatic principle of therapy is aimed at eliminating extremely distressing conditions that subjectively and objectively worsen the patient's critical situation. First and foremost, manifestations of excruciating headache are relieved, and the pathologically heightened sensitivity of the skin and mucous membranes to heat is suppressed.
Prevention of hyperthermic states
The main goal of preventive measures boils down to completely preventing the very possibility of hyperthermia occurring or, if contact with heat is inevitable, minimizing the degree and duration of high temperature exposure on the human body.
Basic preventive measures include three main aspects:
- Engineering and technical environmental equipment: installation of air conditioning systems in premises, as well as the use of water sprayers to optimize the microclimate.
- Dietary control: strict organization and adherence to a rational water-salt dietary regimen. This is necessary for the preemptive maintenance of electrolyte and fluid balance.
- Behavioral adaptation: proper and conscious selection of clothing, which should not impede natural heat dissipation processes.
Briefly: answers to topical questions
What physical cooling methods (besides heat isolation) are used at the first aid stage for hyperthermia?
At the first aid stage for heat stroke and sunstroke, general and local temperature exposure methods are used.
Physical cooling methods include:
- Dousing — general cooling of the body surface with cool water.
- Local hypothermia — applying ice packs to the projection areas of large blood vessels (specifically, the neck and inguinal region).
The "EPS" rule for overheating therapy: Etiotropic (remove the heat) — Pathogenetic (restore homeostasis and BCC) — Symptomatic (relieve pain).
Class and exam questions
Which homeostasis parameters are disrupted first during hyperthermia?
A shift in hydrogen ion concentration (pH) occurs, osmotic and oncotic pressure change, and the circulating blood volume (CBV) critically decreases with a simultaneous increase in its viscosity.
What does detoxification therapy for overheating involve?
It is based on the administration of plasma substitutes and pharmacological stimulation of the excretory function of the kidneys. This is necessary for the accelerated elimination of toxic compounds produced during hyperthermia.
Why is symptomatic treatment necessary if the cause has been removed?
Symptomatic therapy is necessary to relieve distressing conditions, such as unbearable headache and hypersensitivity of the skin and mucous membranes to heat, which greatly worsen the patient's overall condition.
What else to study on this topic
- Mechanisms of blood gas composition changes during overheating.
- Pathogenesis of neurohumoral regulation disorders of the sweat glands.
- Effect of hyperthermia on osmotic and oncotic blood pressure.
- Specifics of toxic compounds formed during hyperthermic states.
- Rational water-salt balance as a key factor in heat adaptation.
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