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barry thermoreg

thermoregulation ppt

QuestionAnswer
What is the goal of thermoregulation? Maintenance of stable core temperature
Vasodialation, sweating, pilorelaxation,and stretching are a response to what? Hot temperature
Vasoconstriction, shivering, piloerection and curling up are a response to what? Cold Temperature
Heat production can increase 500% with what mechanism? Shivering Thermogenesis
How is non shivering thermogenesis regulated? The SNS- it targets the BAT (brown adipose tissue) and skeletal muscle
What is that primary thermogenic tissue in adults? Skeletal tissues
what is that primary thermogenic tissue in children? BAT (brown adipose tissue)
what are the mechanisms of heat loss? Radidation 60%, Evaporation 20%, Convection 15%, and Conduction 5%
What type of heat is lost by photons and without physical contact with an object? Radiation
How is evaporation heat loss prevented? Humidification, covering exposed skin, and using warm preps
In the evaporation mechanism, where is at least half of the heat lost? Respiratory process
Which mechanism is heat lost through direct contact with cooler objects? Conduction
How do you minimize conduction heat loss? Since it's direct heat loss, put things under the pt to protect from cold OR table.(MB slide also says increase ambient temperature, forced warm air, warm solutions)
Relating to convection which has a higer specific heat water or air? Water: therefore warm fluids would act faster than warm air on a pt
Afferent tempreture sensors relate to which system Central or Peripheral? Peripheral sensors
What is the terminal organ for cold sensations? Where is it located? Krauses end bulb : Encapsulated receptor located in connective tissue. Range of stimulation is 15 - 25 degrees Celcius. Anything below these temps are active pain receptors
What is the primary terminal organ for warm sensation, and where is it located? Ruffinis corpuscle: encapsulated receptor located in the subcutaneous tissue. range of stimulation 25-45 degrees celcius
_______ sensations are transmitted to the spinal cord by mylinated A delta nerve fibers. Cold
_______sensations are transmistted to the spinal cord by unmylinated C nerve fibers. Warm
Where do the earliest warning signs of external temp changes come from? Perpheral temperature sensors
When do central recpetors take over the body temperature regulation? Once the skin reaches maximum variability.
Efferent system has two primary pathways, what are they? Neurologic and endocrine
____ regulates cutaneous blood flow and nonshivering thermogenesis through adrenergic efferents adn diaphoresis through cholinergic efferents SNS
Skeletal muscle shivering is stimulated by direct motor response initiated by what? Posterior hypothalamus
What is the most important mechanism for transfering heat from the core to the periphery? Cutaneouos vasodialation
Heat transfer from blood to tissues is what mechanism? convection
In hyperthermia diaphoresis is the major mechanism for which heat loss? evaporation
____causes and increase of cardiac mortality, post-op infection, and an increase in recovery time and hospital lenght of stay. hypothermia
During hypothermia what happens to the respiratory system? Initally it increases and then decreases
A body temp of 32-33 degrees celcius would lead to what? the body not being able to counteract heat loss
A body temp of 22-24 degress celcius would lead to what ? the body become poikilothermic
A body temp of >33 degrees C would lead to what? increased HR, BP, and CO
A body temp of <31 degress C would lead to what? atrial and ventricular irritability
A body temp of <30 degrees C would lead to what? sinus bradicardia and v-fib very likely
A body temp of 21 - 24 degress C would lead to what? risk of v-fib very high
A body temp of < 20 degrees C would lead to what? ASYSTOLE :(
Cerebral blood flow and O2 consumption decrease what percentage for each degree C drop? 7%
MAC decreases what percentage for each degrees C drop? 7%
During hypothermia what happens to uring output? It increases
Maximum shivering happens at what temperatures? Between 33-35 degrees C
What happens to the the hematologic function during hypothermia? increases HCT d/t rise in plasma volume and loss of fluid with diuresis, hyperglycemia, and impaired coagulation d/t thrombocytopenia
What are contributors to intra-operative hypothermia. sedative-hypnotics, opioids, volatile agents, and environment(air temp and cold table etc.)
Who loses more heat? infants or children infants, they can lose up to 4 times more heat than adults
Why do infants lose more heat than adults? they have a thin sub cutaneous layer of insulation and also due to large ventilatory minute volume
True or False: Aging decreases the ability to compensate for heat loss. True if >60 the metabolism decreases to less than 1/2
What is the best temperature that is not a core temperature measurment? Tympanic- it is the closest to core temp d/t location being close to the hypothalmus.
How long does it take to get a true axillary temp? 10 -15 min for the axillary artery to equilibrate
What is the best way to monitor core temp? PA catheter, mixed venous blood, but core temp can be effected by CT surgery
What are active warming methods we utilize? Warm blankets, radiant warmness, forced air warmers (bair huggers etc.) <---most effective of these three
What are active warming methods for the core that we can utilize? heated humidifiers, gastric lavage, peritoneal irrigation, fluid warmers (can heat to 42 degrees C with out causing hemolysis)
What are passive warming methods we can utilize? ambient temperature, insulation foam under bony prominences (insulation) and HME's
Created by: chrisysue7 on 2010-04-07



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