This document discusses temperature regulation and its implications for anesthesia. It begins by introducing concepts like hypothermia, hyperthermia, and methods of measuring core body temperature. It then explains how anesthesia disrupts the body's natural thermoregulation processes, causing patients to become poikilothermic (temperature dependent on environment). Under anesthesia, core temperature declines in three phases - an initial rapid redistribution phase, followed by a slow linear reduction phase, and finally reaching a thermal plateau. The document also discusses complications of unintentional hypothermia, as well as malignant hyperthermia which is an acute, potentially fatal reaction to certain anesthetic gases and succinylcholine in susceptible individuals.
Neuromuscular monitoring, also known as train of four monitoring, is a technique used during recovery from the application of general anesthesia to objectively determine how well a patient's muscles are able to function. It involves the application of electrical stimulation to nerves and recording of muscle response using, for example, an acceleromyograph. Neuromuscular monitoring is typically used when neuromuscular-blocking drugs have been part of the general anesthesia and the doctor wishes to avoid postoperative residual curarization (PORC) in the patient, that is, the residual paralysis of muscles stemming from these drugs.
Fever is an elevation of body temperature that exceeds
normally daily variation and occurs in conjunction with an
increase in the hypothalamic set point for e.g. 37⁰C-
39⁰C.
Neuromuscular monitoring, also known as train of four monitoring, is a technique used during recovery from the application of general anesthesia to objectively determine how well a patient's muscles are able to function. It involves the application of electrical stimulation to nerves and recording of muscle response using, for example, an acceleromyograph. Neuromuscular monitoring is typically used when neuromuscular-blocking drugs have been part of the general anesthesia and the doctor wishes to avoid postoperative residual curarization (PORC) in the patient, that is, the residual paralysis of muscles stemming from these drugs.
Fever is an elevation of body temperature that exceeds
normally daily variation and occurs in conjunction with an
increase in the hypothalamic set point for e.g. 37⁰C-
39⁰C.
The Effects of Temperature and its dysregulation on health and in disease. Includes Heat stroke, Malignant Hyperthermia, Neuroleptic malignant syndrome as well as Hypothermia and Frost bite
vitals sign is the basic parameter used for all the patients to know the vital and general parameter for the patients and any changes in this parameter can cause the life threatening condition for the patients or clients life the proper technique and its alternatives assessment knowledge can help the nurses to improve academic performance and can be apply this knowledge in their clinical practices
Temperature is the balance between the heat production and heat loss.
A brief outline of diffrent aspects regarding body temperature is discussed here under following headings
*Normal body temperature regulation
*Fever of unknown origin
*Hyperthermia
*Hypothermia
*Frost bite
A fever is a temporary increase in your body temperature, often due to an illness. Having a fever is a sign that something out of the ordinary is going on in your body. For an adult, a fever may be uncomfortable, but usually isn't a cause for concern unless it reaches 103 F (39.4 C) or higher.
It's a fever when a child's temperature is at or above one of these levels: measured orally (in the mouth): 100°F (37.8°C) measured rectally (in the bottom): 100.4°F (38°C) measured in an axillary position (under the arm): 99°F (37.2°C)
Body temperature by Pandian M, Tutor Dept of Physiology, DYPMCKOP, this PPT f...Pandian M
BODY TEMPERATURE
HEAT BALANCE
Mechanisms of heat gain
Mechanisms of heat loss
VARIATIONS OF BODY TEMPERATURE
REGULATION OF BODY TEMPERATURE
Thermoreceptors
Hypothalamus: the thermostat
Thermoregulatory effector mechanisms
ABNORMALITIES OF BODY TEMPERATURE
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temperature regulation under anesthesia.ppt
1.
2. Temperature regulation & its anesthetic
implications
Dr Tanveer Alam Khan
Department of Anesthesiology
Shaukat Khanum Memorial Cancer Hospital & Research Centre
29th September 2017
3. Learning Objectives
• Introduction
• Techniques of measuring temperature
• What happens in anesthesia ?
• Maintaining normothermia
• Hypothermia and its complications
• Malignant hyperthermia
• Take home message
Objectives introduction Thermoregulation Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
4. Introduction:
Thermoregulation:
is the ability of an organism to keep its body temperature within certain boundaries’
Body temperature is usually maintained near a constant level of 36.5–37.5 °C (97.7–
99.5 °F) through thermoregulation
Hypothermia
it is defined as a body core temperature below 36.0 °C (95.0 °F)
Hyperthermia
37.5 or 38.3 °C (99.5 or 100.9 °F
Hyperpyrexia
>40.0 or 41.0 °C (104.0 or 105.8 °F)
.
Objectives introduction Thermoregulation Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
7. Thermoregulation
Processing of thermoregulatory information:
• Afferent input cold signal-Aδ fiber warm signal-C fiber
• Central control Hypothalmus
• The inter-threshold range (core temperatures that do not trigger autonomic thermoregulatory responses)
is only 0.2℃
• Efferent responses
Major autonomic defenses against heat:
sweating cutaneous vasodilation
Major autonomic defenses against cold:
cutaneous vasoconstriction , nonshivering thermogenesis , shivering
Objectives introduction Thermoregulation Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
8. Anesthesia and thermoregulation
• General anesthesia removes a pt’s ability to regulate body temperature through
behavior, so that autonomic defenses alone are available to respond to changes in
temperature
• Inter-threshold range is increased from 0.2 to 4℃ (20 times), so anesthetized pts
are poikilothermic - with body temperatures determined by the environment
Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
9. Anesthesia and thermoregulation
Phase 1 redistribution in 1 hour
Phase 2 gradual decline 2 to 4 hours
Phaase 3 steady state Thermal plateau> 4 hours
Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
10. Anesthesia and thermoregulation
Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
PHASE 1
Heat redistribution
decreases 0.5-1.5℃ during 1st hr
Heat redistribution decreases core
temperature, but mean body
temperature and body heat
content remain unchanged
11. Anesthesia and thermoregulation
Phase 2 Slow linear reduction
decreases in a slow linear fashion for 2-3hrs
Simply because heat loss >metabolic heat production
90% heat loss through skin surface by radiation and convection
Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
12. Anesthesia and thermoregulation
Phase 3 : thermal plateau
• After 3-5 hrs, core temperature stops decreasing
• It may simply reflect a steady state of heat loss=heat production
• If a pt is sufficiently hypothermic, plateau phase means activation of
vasoconstriction to reestablish the normal core-to-peripheral temperature
gradient
• Separation of core and peripheral compartments
Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
13. Anesthesia and thermoregulation
Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
35
36
37
38
Threshold
(°C)
Control Spinal
Sweating
Vasoconstriction
Shivering
35
36
37
38
Threshold
(°C)
Control Spinal
Sweating
Vasoconstriction
Shivering
Regional anesthesia impairs both central and
peripheral thermoregulation
Central regulatory inhibition
Increased inter-threshold range
Peripheral sympathetic and motor block
Incorrect perceiving of skin temperature
Behavioral inhibition
Hypothermia fails to trigger cold sensation
Hypothermia
Comparable to general anesthesia but Worst
when general and regional combined
14. Hypothermia
Complications
• Wound infection
• Decrease Coagulopathy
• Drug metabolism
• Increases morbid myocardial
outcomes
• Promotes bleeding and increases
transfusion requirement
• Thermal discomfort
• Postop recovery time
Potential benefits
• Neuroprotective by dec
CMRO2 (7% 1C) & dec in ICP
• Decrease free radical
formation
Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
15. Hypothermia management
• Pre warming
• Operative room condition
• Airway heating and humidification
• Fluid warming
• Cutaneous warming / forced air warming
• More layers don't really help much !
• Fluid warming +Forced air warming are enough to maintain core body
temperature intraoperatively
Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
16. Malignant Hyperthermia
“It is a biochemical chain reaction response triggered by commonly used general
anesthetics and the paralyzing agent succinylcholine, within the skeletal muscles of
susceptible individuals” –MHAUS.org
Has autosomal dominant inheritance
Incidence of 1-5 : 100,000, < 5% mortality rate
Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
17. Pathopysiology
Alteration in the Ca induced ca release via the ryanodine receptor channel
(RYR1) or! impairment in the ability of the sarcoplasmic reticulum to sequester
calcium via the ca transporter
After trigger agent is administered, there is a sudden and prolonged release of
ca which causes
- Massive muscle contraction
- Lactic acid production
- Increased body temperature
Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
19. Malignant Hyperthermia
Trigggering agents
Volatile gaseous inhalation:
Isoflurane
Sevoflurane
Desoflurane
Haloflurane
Enflurane
Methoxyflurane
Succinylcholine:
Suxamethonium
decamethonium
Non triggering agents
Propofol
Ketamine
Nitrous oxide
All local anesthetics
All narcotics
Non depolarizing muscle relaxants:
•Vecuronium
•Rocuronium
•pancuronium
Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
20. Malignant Hyperthermia
• Call for help (let surgeon know)
• Turn off potential triggering agents
• Administer dantrolene 2.5 mg/kg every five minutes
• Cool patient to 38C
• Monitor and correct blood gases, electrolytes and glucose
• Dantrolene stops the calcium released by binding to the ryanodine receptor and
blocking the opening of the channel therefore stopping the release of calcium. It
has little effect on heart and smooth muscles as the ryanodine receptors differ in
these tissues (RYR2).
•Objectives introduction Anesthesia and
Thermoregulation
Hypothermia/
Hyperthermia
Malignant
hyperthermia
Take home
message
21. Take home message
• Body maintains normothermia by thermoregulation
• Anesthesia cause hypothermia in three different phases rapid > slow
>plateau
• Hypothermia can leads to serious complication like increase bleeding
,increase transfusion requirement , decrease metabolism ,increase risk
for infection ,increase hospital admission duration
• Hypothermia can be neuroprotective
• Hypothermia can be controlled efficiently.
• Malignant hyperthermia is an anesthetic emergency ,can be predict
during preoperative history, always call for senior help, manageable
inside OR with help of dentroline and needs post op ICU/HDU
postoperatively after discharge
Introduction Obesity Bariatric surgery Peri-operative management Take home message
22. References
• Brown, DJ; Brugger, H; Boyd, J; Paal, P (Nov 15, 2012). "Accidental hypothermia.". The New England Journal of Medicine.
Laupland KB (July 2009). "Fever in the critically ill medical patient". Crit. Care Med.
Brown, DJ; Brugger, H; Boyd, J; Paal, P (Nov 15, 2012). "Accidental hypothermia.". The New England Journal of Medicine
• Thermoregulation: Physiological and Clinical Considerations during Sedation and General Anesthesia
• Marcos D´ıaz, DDS* and Daniel E. Becker, DDS ` *Private Practice, Advanced Aesthetic Center for Oral and Maxillofacial
Surgery, Weston, Florida, Professor of Life and Health Sciences, Sinclair Community College, and `Associate Director of
Education, General Dental Practice Residency, Miami Valley Hospital, Dayton, Ohio
Introduction Obesity Bariatric surgery Peri-operative management Take home message
23. Few BCQs ,shall we?
Introduction Obesity Bariatric surgery Peri-operative management Take home message
24. Q:1
• The following are physical processes by which heat is lost from the body.Which
sequence reflects the order of these processes from greatest to least percentage
of total heat loss?
• A. Convection and conduction, evaporation, radiation
• B. Convection an d conduction, radiation, evaporation
• C. Evaporation, radiation, conduction and convection
• D. Radiation, conduction an d convection, evaporation
• E. Radiation, evaporation, conduction and convection
Introduction Obesity Bariatric surgery Peri-operative management Take home message
25. Q:2
Following in duction of general anesthesia, a decline in body temperature occurs in 3
phases. Which of the following statements accurately describe these phases?
A. During phase1, core temperature declines as heat is redistributed from core
tissues to peripheral tissues.
B. During phase 2, core temperature declines as heat is lost from the body.
C. During phase 3, core temperature declines rapidly as mechanisms for
thermoregulation commence to fail.
D. A and B are correct.
E. A, B, and C are correct
Introduction Obesity Bariatric surgery Peri-operative management Take home message