Emergency Care and Transportation of the Sick and Injured
Introduction to Environmental Emergencies
Medical emergencies can result from various environmental factors, affecting multiple populations, including:
Children
Older adults
Individuals with chronic illnesses
Young adults who may overexert themselves.
Environmental emergencies encompass different categories:
Heat- and cold-related emergencies
Water emergencies
Pressure-related injuries
Injuries caused by lightning
Envenomation.
Factors Affecting Exposure
Multiple factors contribute to how individuals experience exposure to environmental conditions:
Physical Condition
The physical health of an individual greatly affects susceptibility to environmental emergencies.
Age
Infants, children, and older adults are more likely to experience temperature-related illnesses.
Nutrition and Hydration
A lack of food or water exacerbates the effects of hot or cold stress.
Environmental Conditions
The environmental situation can either worsen or alleviate exposure risks. Extreme temperatures and humidity are not always necessary to produce injuries.
Cold Exposure
Cold exposure can lead to injuries in various body parts, including:
Feet
Hands
Ears
Nose
The entire body.
Mechanisms of Heat Loss
The body can lose heat through five mechanisms:
Conduction: Heat loss through direct contact with a colder object.
Convection: Heat loss due to air or water movement over the skin.
Evaporation: Heat loss as water evaporates from the skin.
Radiation: Heat loss through infrared radiation into the surrounding environment.
Respiration: Heat lost through exhalation of air.
Modifying Heat Loss or Gain
The rate and amount of heat loss or gain by the body can be modified in three ways:
Increasing or decreasing heat production.
Moving to an area where heat loss can be lessened or intensified.
Wearing appropriate clothing suitable for the environmental conditions.
Hypothermia
Hypothermia occurs when the body core temperature falls below 95°F (35°C), leading to:
Loss of the ability to regulate body temperature and generate heat.
Slowdown of key organs such as the heart, resulting in deteriorating mental status.
Potentially fatal consequences if untreated.
Risk Factors for Hypothermia
Several groups are at heightened risk of developing hypothermia, including:
Homeless individuals or those without adequate heating.
Swimmers exposed to cold water.
Geriatric, pediatric, and ill individuals.
Stages and Signs of Hypothermia
The signs and symptoms of hypothermia become increasingly severe as core temperature drops, progressing through four general stages. Assessment of temperature is crucial, typically using the back of the hand placed on the patient's abdomen for best accuracy.
Classifications of Hypothermia
Mild Hypothermia: Core temperature 90°F - 95°F (32°C - 35°C).
Moderate/Severe Hypothermia: Core temperature less than 90°F (32°C). Always assess for signs of life before concluding a patient is deceased; cold and pulseless patients may still be alive.
Local Cold Injuries
Cold injuries typically affect exposed body parts:
Severity Determinants
Factors influencing the severity of local cold injuries include:
Duration of exposure.
Temperature exposure levels.
Wind velocity during exposure.
Underlying factors like wet conditions, inadequate insulation, restricted circulation, fatigue, poor nutrition, substance abuse (alcohol or drugs), pre-existing medical conditions (hypothermia, diabetes, cardiovascular diseases), and age.
Types of Local Cold Injuries
Frostnip: The skin freezes, but deeper tissues are unaffected, typically causing minimal pain and often going unnoticed by the patient.
Immersion Foot: Results from prolonged exposure to cold water, common among hikers and hunters.
Frostbite
Frostbite is the most severe local cold injury, characterized by frozen tissues. In cases of frostbite, gangrene may necessitate surgical removal of dead tissue. Frostbite signs of damage vary with depth:
Superficial Frostbite: Only the skin freezes.
Deep Frostbite: Deeper tissues freeze, leading to potential complications.
Emergency Care for Cold Injuries
Scene Size-Up
Evaluate current weather conditions and ensure responders' safety while identifying hazards like icy surfaces.
Primary Assessment
General impression and rapid scan of the patient.
Immediate treatment of any life threats.
Evaluation of mental status using the AVPU scale.
Cardiopulmonary Resuscitation (CPR)
In cases of cardiac arrest, commence CPR immediately, verifying airways and breathing adequacy. Utilize warmed, humidified oxygen as needed to assist in rewarming from within.
Transport Considerations
Complications such as cardiac dysrhythmias and blood clotting abnormalities arise with hypothermia. Immediate transport to medical facilities is required for all hypothermic patients. Improper handling of a hypothermic patient can induce heart fibrillation.
History Taking and Secondary Assessment
Gather information regarding the chief complaints, including:
Duration of exposure to cold conditions.
Relevant medical history and symptoms.
Conduct physical exams focused on assessing the severity of hypothermia and damage extent.
Vital Signs Assessment
A patient's vital signs may be altered due to hypothermia effects. Take note of respiratory rates, blood pressure, pulse quality, and mental status changes to gauge hypothermia severity.
General Management of Cold Emergencies
Utilize the following strategies for managing cold emergencies:
Move the patient to a warmer environment.
Remove wet clothing to prevent further heat loss.
Apply dry blankets underneath and on top of the patient.
If resources are available, administer warm, humidified oxygen, and avoid massage or stimulants.
For mild hypothermia, engage in active rewarming techniques in a safe environment, while for moderate to severe cases, focus on preventing further heat loss without active rewarming efforts.
Emergency Care of Local Cold Injuries
An injured part must be handled gently and insulated from further cold exposure. If transportation delays are likely, consider active rewarming methods. In cases of frostnip or immersion foot, allow gradual rewarming without re-exposure to cold. Blisters should not be ruptured or massaged, and treatments should aim to avoid further injury.
Heat Exposure
In hot environments, the body expels excess heat via:
Sweating and evaporation.
Skin blood vessel dilation.
Movement to cooler settings.
Hyperthermia
Hyperthermia refers to a core temperature of 101°F (38.3°C) or higher. Risk factors include environmental heat, high humidity hindering sweat evaporation, lack of acclimatization, and vigorous exertion leading to fluid and electrolyte loss.
Populations at Risk
Individuals especially vulnerable to heat illnesses include:
Children and infants.
Elderly patients.
Patients with heart disease, chronic obstructive pulmonary disease (COPD), diabetes, obesity, and limited mobility.
Types of Heat-Related Illnesses
Heat Cramps: Painful muscle spasms, notably in legs and abdominal areas, typically after heavy exercise.
Heat Exhaustion: The most common heat-related illness, marked by weakness, nausea, and often resulting in syncopal episodes.
Heat Stroke: The least common but most critical heat illness requiring immediate intervention, presenting with symptoms of confusion, disorientation, and unconsciousness.
Assessing Heat-Related Emergencies
Use a comprehensive scene size-up and primary assessment approach to evaluate the patient and environment. Factors such as mental status and emergency signaling can provide pivotal information about the patient's condition and required treatment interventions.
Management of Heat Emergencies
Appropriate management methods must be employed depending on the nature and severity of the heat-related emergency:
Manage environmental factors through relocations.
Orderly cooling operations like using wet sheets or fans.
Provide fluid replacement, oxygen, and transport to medical facilities when necessary.
Drowning and Water Emergencies
Drowning entails respiratory impairment resulting from liquid submersion or immersion. Factors increasing risks include alcohol use, the presence of seizures, and unsupervised water access.
Spinal Injuries in Drowning Emergencies
As spinal injuries may accompany submersion incidents, appropriate stabilization is essential, especially if the patient is unconscious or complains of neurological disturbances.
Water Rescue Techniques
Follow the principle of “Reach, throw, and row, and only then go” when performing water rescues. Trained responders should only conduct swimming rescues, and specialized recovery personnel should handle submerged individuals.
Ascent Emergencies in Diving
Ascending too rapidly from diving depths often precipitates critical medical situations such as air embolism and decompression sickness. Attention should be given to these complications, requiring rigorous treatment protocols including potential hyperbaric chamber interventions.
Emergency Resuscitation for Drowning
Initial management consists of removing water, performing chest compressions, and providing airway support. Continuous monitoring and immediate transportation to specialized facilities remain paramount in these emergencies.
Envenomations and Bites
Spider Bites
Only specific spiders, such as the female black widow and brown recluse, pose serious threats through their bites. Treatments vary depending on the venom and symptoms exhibited by the victim, with emergency services prioritized for black widow spider bites due to neurotoxic effects.
Snake Bites
In the U.S., a limited number of snakes such as rattlesnakes and coral snakes are venomous. Envenomation symptoms include localized pain and tissue damage requiring prompt and specialized medical intervention.
Other Animal Stings and Bites
Species like Hymenoptera (e.g., bees and wasps) can cause allergic reactions, while tick bites can transmit diseases such as Lyme disease and Rocky Mountain spotted fever. Rapid identification and proper removal techniques are critical in these contexts.
Marine Animal Injuries
Certain marine life can affect individuals through venom or physical injury. Emergency care should ensure stabilization and protection from any ongoing threats, with proper environmental considerations.
Prevention of Environmental Emergencies
Effective prevention strategies include appropriate preparations for cold temperatures, heat environments, and potential water access dangers. Adequate supervision, situational awareness, and proper gear can mitigate risks substantially.
Review Questions and Answers
A series of review questions reinforce core concepts related to heat and cold influences on the human body, management of symptoms, and examination of cases demonstrating the principles of emergency response. This section includes vital rationales and situational context for a robust understanding of both environmental emergencies and necessary prehospital care.