Fever and Intro to Pain Flashcards
What is a fever?
Physiologic response where the core temp of the body is increased
Generally defined as a rectal temp > 38°C, oral temp 37.5°C, axillary temp > 37.3°C, tympanic temp > 38°C
What are the recommended techniques for measuring temp in an infant aged 0-2yrs?
1) rectal
2) axillary
What are the recommended techniques for measuring temp in children aged 2-5yrs?
1) rectal
2) axillary, tympanic
What are the recommended techniques for measuring temp in patients aged over 5yrs?
1) Oral
2) Axillary, tympanic
what is the chemical responsible for producing fever? What are the two different kinds?
Pyrogens
Endogenous and exogenous
what are endogenous pyrogens?
proteins that induce fever including such chemicals as IL-1, tumor necrosis factor alpha, IL-6, neurotropic factor and IF-gamma
what are exogenous pyrogens?
chemicals produced by bacteria or by components of the organism that stimulate the release of endogenous pyrogens
what occurs in response to circulating pyrogens?
prostagladin E2 is produced and elevate the thermoregulatory set point of the hypothalamus
what are 3 ways the body temp is increased?
1) vasoconstriction of peripheral blood vessels
2) shivering to increase heat production
3) behavioural changes
what part of the body controls fever?
hypothalamus
why is the hypothalamus important in fever?
it is the thermoregulatory center, which balances heat production and dissipation
what is hyperthermia?
increase in body temperature not due to the hypothalamus
what are 4 risk factors of fever?
bacterial/viral infection
cancer
multisystem diseases
medications
name 10 red flags for fever
1) babies under 6 months old
2) fever lasting longer than 72 hours
3) Fever longer than 24 hours without obvious cause
4) fever over 40.5°C
5) Child appears very ill, excessively cranky or irritable, cries inconsolably
6) patient has persistent wheezing and cough
7) patient has a rash with fever
8) patient is difficult to arouse, confused or delirious, has recently received chemotherapy or has serious underlying disease
9) patient had recent surgery or dental procedures, recently travelled or eaten raw/poorly cooked meat or fish, or recently started a new drug
10) child has any other symptoms that bother the parents
What are 6 signs and symptoms associated with fever?
1) sweating, dehydration
2) headache
3) malaise, fatigue
4) backache, myalgia, arthalgia
5) discomfort
6) febrile seizures
what are 4 goals of therapy for fever?
1) provide patient comfort
2) reduce parental anxiety
3) reduce metabolic demand caused by fever in patients with cardiovascular or pulmonary disease
4) prevent or alleviate fever-associated mental disfunction in the elderly
what are 4 non-pharms for fever?
1) remove excess clothing, blankets, and bedding to keep the person cool and comfortable
2) increase fluid intake to replace water loss from fever-produced sweating
3) avoidance of extreme physical exertion
4) maintain normal room temperature
what are the two medications that can be used to treat fever in children?
acetaminophen
ibuprofen
what is acetaminophen’s MoA?
reduces fever by inhibiting the formulation and release of prostaglandins in the CNS and by inhibition of endogenous pyrogens at the hypothalamic thermoregulator centre
what is the onset of acetaminophen?
oral: 30 min
what is the time of peak for acetaminophen? duration?
time of peak: 3hr
duration: 4-6 hours
what are some SE’s with acetaminophen?
allergic reaction
nausea and upper GI discomfort
serious skin reactions
all of these are rare