Temperature disturbances Flashcards
There are three phases of thermoregulation.
1) Afferent sensing
2) Central thermoregulatory integration
3) Efferent response
Cold impulses travel centrally via?
Myelinated A-delta fibers
Warmth is transmitted by?
Unmyelinated C fibers
Most ascending thermal information travels
cephalad via?
Anterior spinothalamic tract
Stages of hypothermia? (3)
1) Mild 32 to 35 C, 90 to 95 F
2) Moderate hypothermia 27 to 32 C, 80 to 90 F
3) Severe hypothermia < 27 C, <80 F
Which physical processes contribute to a patient’s heat loss in the operating room? (4)
1) Radiation (60%)
2) Evaporation (20%)
3) Convection (15%)
4) Conduction (5%)
One unit of refrigerated blood or 1 L of room-temperature crystalloid decreases the body temperature about _ C
0.25 C
Sites for monitoring temperature include?
- Skin
- Rectum
- Esophagus
- Nasopharynx
- External auditory canal
- Bladder
- PA catheter
Shivering is modulated through the hypothalamus
and can increase the body’s production of heat by up to ___% in young, muscular individuals.
300
Infants younger than 3 months of age cannot shiver and mount a caloric response by nonshivering thermogenesis, which increases metabolic heat production without producing mechanical work. What are the mode of heat production in these populations?
Skeletal muscle and brown fat tissue are the major energy sources for this process.
Below 32 C an elevation of the junction of the QRS and ST segments known as the ____ or ___ may be seen.
Hypothermic hump or Osborne or J wave
Its size increases with decreasing body temperature;
it usually is seen in leads __ and __ and may spread to leads V3 and V4.
II and V6
The best method to treat hypothermia is use of?
Forced-air warming blankets
The minimum alveolar concentration of inhalational agents is decreased about __ % to __% per
degree centigrade decrease in core temperature.
5 to 7
Warming method which uses the body’s ability to generate heat if continued heat loss is minimized
by covering exposed areas.
Passive rewarming
