PCC exam 2
Normal Thermoregulation
Core body temperature is approximately 98.6°F (37°C).
Normothermia: Range of 36.5-37.2°C.
Hypothermia: Below 36.2°C.
Hyperthermia: Above 37.6°C.
Hyperpyrexia: Exceeding 41.5°C.
Fever: Body temperature of 100.4°F or greater, due to a change in the hypothalamic set point.
Thermoregulation Process
The body maintains a nearly constant core temperature by balancing heat production and heat loss.
Heat Production:
By-product of metabolism.
Heat Balance:
Heat produced = amount loss
Hyperthermia: more Heat production than heat loss.
Hypothermia: more Heat loss than heat produced
Body Responses to Temperature Changes
Increased Temperature:
Blood vessels dilate, causing a flushed appearance.
Sweat glands activate to cool the body.
Decreased Temperature:
Blood vessels constrict to trap warmth in deeper tissues.
Sweat glands become less active.
Skeletal muscles contract causing shivering to generate heat.
Nursing Process: Temperature Measurement
Methods of Measurement:
Oral: Wait 30 minutes after food/drink, suitable for ages 5-6.
Rectal: Most accurate, typically a last resort.
Axillary, Tympanic (ear), Temporal artery (forehead).
Core Temperature Regulation
Sensors: Most sensory receptors are in the skin; more receptors for cold than warmth.
Chilled skin prompts body regulation.
Shivering: Increases heat production.
Sweating Inhibited: Decreases heat loss.
Vasoconstriction: Reduces heat loss.
Hypothalamus:
Preoptic area controls core temperature via signals to adjust heat production/loss in response to temperature changes
Sensors detect heat → signals to decrease heat production, increase heat loss
Cold sensors stimulated → signals to increase heat production, decrease heat loss
Normothermia and Hyperthermia
Normothermia: 96.8-100.4°F (36-38°C).
Hyperthermia (fever):
Heat-related injuries can occur even with moderate temperature increases.
Febrile: Has a fever; Afebrile: Does not.
Febrile Seizures
Common in childhood, with an unclear cause, potentially viral infections
More frequent in boys
Antipyretics or anticonvulsants are not always effective in preventing these seizures.
Cause: maybe viral infection but unknown
Interventions include:
Lowering room temperature.
Using a cool washcloth.
Ensuring proper hydration
luke warm bath
Heat-Related Disorders
Heat Stroke:
Dangerous condition with high environmental temperature casues Dysfunction in the brain’s thermoregulatory center.
Core temperature rises significantly, potentially leading to organ failure or death
cause vascular collapse, cerebral edema, CNS dysfunction, organ failure, death
Symptoms: Paleness, dizziness, nausea (N/V), confusion, and fainting.
Hypothermia:
Core body temperature below 35°C (95°F).
Mild (32-35°C), Moderate (28-32°C), Severe (<28°C).
Mechanisms of Hypothermia:
Excessive heat loss, inadequate heat production, impaired hypothalamic thermoregulation.
Health Promotion for Temperature Regulation
Hyperthermia Risk Factors:
Age (very young/old), obesity, chronic illnesses, medications, and high heat index
awareness of harmful conditions (high humidity, dehydration, hot weather)
Interventions: Seek shade, drink fluids, avoid overexertion in heat
Hypothermia Risk factors:
Outdoor exposure, Trauma, Alcohol, drug abuse,Endocrine disorders, Previous neurologic impairment, Dermatologic disorders, Social isolation, Socioeconomic status
Diagnosing Temperature Abnormalities
Physical Examination:
Core temperature measurement; invasive only for critically ill patients.
Diagnostic Tests:
CBC for suspected infections, imaging for head trauma.
Independent Interventions:
Support thermoregulation through environment, hydration, and temperature monitoring.
Interventions for Hyperthermia and Hypothermia
Hyperthermia:
Monitor airway, breathing, circulation.
Provide cool fluids and clothing removal to aid cooling.
Severe symptoms may require immediate cooling methods, including ice packs and leg elevation.
Hypothermia Treatment:
Begin rewarming from the core, ensure a dry environment.
Apply warm compresses and remove wet clothing.
Page 5
Fever Pathophysiology
Fever: Results from a rapid change in the hypothalamic set point, typically due to infection or tissue damage.
Heat Production Phases:
Chill Phase: chills, cold skin, shivering.
Plateau Phase: Core temperature stabilizes at a new, higher set point.
Risks of High Temperatures
Extremely high temps can damage cellular structures, especially the brain, leading to potential dysfunction or death.
Response to infection includes macrophage activity and prostaglandins production, which reduces heat loss and raises body temperature.
Page 6
Heat Cramps Management
Severe cramps occur after intense exercise often due to inadequate fluid intake.
Symptoms include nausea, tachycardia, and profuse sweating.
Treatment involves rest and electrolyte replenishment.
Heat Exhaustion Symptoms and Interventions
Symptoms: fatigue, weakness, nausea, flushing, confusion, hypotension, elevated temperature (37.5°-41°C).
Fluid replacement should be monitored according to lab findings; IV fluids recommended.
Page 7
Heat Stroke Emergencies
Most severe heat-related emergency with rapid core temperature increase.
Signs include altered mental status, hypotension, and hot, dry skin.
Management:
Stabilize ABCs, lower core temperature quickly, and monitor for complications.
Page 8
Malignant Hyperthermia
Genetic disorder triggered by certain anesthetics, causing rapid muscle metabolism.
Symptoms: tachycardia, hypercarbia, increased temperature.
Treatment: Dantrolene to slow metabolism and reduce muscle contraction.
Page 9
Lifespan Considerations
Children and Adolescents
Febrile seizures risk in children aged 6 months to 5 years, often rapid temperature increases.
Importance of increased fluids, rest, and parental education for managing fevers.
Pregnant Women
Risks associated with fever and hyperthermic exposure during the first trimester.
Older Adults
Infection is a common cause of fever; atypical symptoms may delay treatment.
Page 10
Nursing Process in Fever Management
Assess signs and symptoms of infection, maintain hydration, and monitor vital signs.
Treatment for fever may include IV medications in a hospital setting.
Page 11
Hypothermia Overview
Hypothermia occurs when body heat loss exceeds heat production; can be severe.
Induced Hypothermia: Deliberate lowering of body temperature for medical purposes.
Stages of Hypothermia
Stage I: Conscious, shivering.
Stage II: Impaired consciousness.
Stage III: Unconscious, shivering ceases.
Stage IV: No vital signs present.
Page 12
Treatment Approaches for Hypothermia
Mild Hypothermia (89.6-95°F): Remove wet clothing and use warm blankets.
Moderate Hypothermia (82.4-89.6°F): May require active rewarming techniques like IV fluids.
Page 13
Severe Hypothermia Management
Below 82.4°F is life-threatening, identifying comatose state.
Focus on rewarming strategies and maintaining vital functions.
Page 14
Frostbite Considerations
Frostbite injury can occur at exposures to freezing temperatures, often affecting peripheral areas.
Symptoms vary from numbness to severe necrosis; treatment involves gradual rewarming and potential surgical interventions.
Page 15
Risk Factors for Hypothermia
Environmental exposure, lack of clothing, trauma, and certain medical conditions increase risk.
Rewarming Risks
Monitoring for afterdrop (further drop in temperature) during rewarming is critical.
Page 16
Assessment Techniques for Hypothermia
Observe for shivering, confusion, and coordination issues.
Physical examination for temperature variances and vital sign checks.
Page 17
Recommended Nursing Actions
Promote comfort and safe warming techniques during hypothermic events.
Educate patients and caregivers on avoiding cold-related injuries.