This document discusses abnormal body temperatures including fever, hyperthermia, and hypothermia. It provides details on the causes, pathogenesis, clinical findings, and treatment of fever. Key points include: Fever is defined as a rise in core body temperature above normal limits independent of ambient conditions, often caused by infection, immune reaction, or tissue damage. Pathogenesis involves exogenous pyrogens stimulating cells to produce endogenous pyrogens like interleukin-1 and -6 that raise the hypothalamic temperature set point. Fever progresses through increment, fastigium, and decrement stages. Treatment involves antimicrobials, antipyretics, and anti-inflammatories.
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Iowa State University's College of Veterinary Medicine student Allison Kirchgatter presents a case of Vestibular Disease in a geriatric canine patient as seen at Iowa Veterinary Specialties.
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Mechanisms of heat loss
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REGULATION OF BODY TEMPERATURE
Thermoreceptors
Hypothalamus: the thermostat
Thermoregulatory effector mechanisms
ABNORMALITIES OF BODY TEMPERATURE
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5. PATHOGENESIS OF FEVER
Fever may be provoked by many stimuli. Most often, they are
bacteria and their endotoxins, viruses, protozoa, immune
reactions,
These substances are commonly called exogenic pyrogens.
Cells stimulated by exogenic pyrogens to produce cytokines
called endogenic pyrogens.
Endogenic pyrogens centrally affect the thermosensitive
neurons in the hypothalamus increase the production of
heat and decrease in heat loss
The most important endogenic pyrogens are interleukins IL-
1, IL-6 and the tumour necrosis factor- (TNF- ) produced
especially by monocytes and macrophages but also by
endothelial cells
6. Interleukin-1 initiates fever by increasing the
synthesis of prostaglandins, especially PG E2
in the anterior hypothalamus.
This raises the thermostatic set point and
induces the mechanism of heat conservation
and heat production until the blood and core
temp. are elevated to match the
hypothalamic set point.
Therefore, antipyretics containing
prostaglandin synthetase inhibitor lower
fever by blocking the PG synthesis
7. STAGES OF FEVER
1- increment stage
Cutaneous vasoconstriction
Absence of sweating
Cold skin and extremities
Reduced respiration
Muscle shivering
Reduced respiration
Oliguria
Rectal temperature is elevated
8. 2- Fastigium stage (state of constant
temperature)
The period of heat increment raises temperature to
the new thermostatic level
Cutaneous vasodilation to dissipate heat
Severe sweating
Diuresis (increased urine production)
Decreased ruminal motility
Increased metabolism and tissue wasting
9. 3- Decrement stage:
Excess heat is dissipated via
Vasodilatation
Sweating
Muscle falccidity
If toxaemia is present, the ability of the tissues
to respond to heat production or conservation
may be lost and hypothermia may occur before
death
11. CLINICAL FINDINGS OF FEVER
Elevation of body temperature
Increased heart rate with diminution of pulse
amplitude
Hyperpnea (increased respiratory rate)
Increased thirst
Oliguria (reduced amount of urine) with sometimes
albuminuria
Scanty faeces
Anorexia
Depression and muscle weakness
12. FORMS OF FEVER
Transient : fever for short periods (hours)
Continuous or sustained: without diurnal
variations
Remittent: with diurnal variation
Intermittent when fever peaks last for 2-3 days
and interspersed with normal period
Recurrent fever: peaks of fever for about 6 days
interspersed with equal period of normal temp.
Atypical: when temperature variations are irregular
21. EXERCISE-INDUCED BOVINE STRESS SYNDROME
walking 3.6 km in 2 h. Blood samples and measurements of respiratory rate,
ambient temperature and rectal temperature were taken immediately before
exercise, and at 0.5, 1.0, 1.5 and 2.0 h during the exercise and 24 h later.
Clinical and blood constituent data were subjected to standard analysis of
variance and repeated measures analysis.
In the field study, affected cattle were observed to show abnormally anxious
and hyperactive behaviour. This behaviour was exhibited by affected cattle
during the experimental exercise program where it was shown to be
accompanied by hyperthermia and hyperventilation.
The experimental study showed that affected cattle developed metabolic
acidosis and became hyperglycaemic.
Their plasma creatine kinase activity remained markedly increased at 24 h after
exercise but other clinical and blood constituent variables had returned to
normal values. CONCLUSION: The clinical and biochemical changes detected in
affected cattle were consistent with exercise-induced malignant hyperthermia.
22. Blood samples were collected from unstressed cattle and from cattle
undergoing handling stress, transport stress and slaughter. The blood was
analysed for ACTH, cortisol, thyroxine stimulating hormone, tri-iodothyronine
(T3) and catecholamine concentrations, and for haematocrit, total plasma
protein, plasma lipid, lactate and glucose concentrations. Compared to control
values handling significantly increased T3, cortisol, lipid and lactate
concentrations. Compared to handling, transport stress was associated with
increased catecholamines and lactate concentrations, a decreased cortisol
concentration and similar concentrations of T3, lipid and glucose. Compared to
transport, slaughter resulted in high catecholamines, lactate and glucose, and
low T3, cortisol and lipid levels. It is concluded that the response to stress has
two phases, a hypothalamic-adrenal cortex phase which is associated with
perceived environmental stress such as noise, and a sympathetic-adrenal-
medulla phase which is associated with neurogenic stress such as transport or
specifically the massive sympathetic discharge caused by stunning.
Combinations of stresses produce a mixed response.