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Tetanus

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Dr Ramesh R
 Tetanus ( "to stretch") is a medical condition
characterized by a prolonged contraction
of skeletal muscle fibers due to an EXOTOXIN
produced by C.Tetani
 Contaminated wounds
 Deep wounds
 Devitalized (dead) tissue
 Puncture wounds, such as those caused by
nails, splinters, or insect bites
 BURNS pt
 Any break in the skin
 Injection-drug sites.
 Newborn child (by means of the uterus after
delivery and through the umbilical cord
stump).
 Up to several months, but is usually about 14
days.
 In general, the further the injury site is from
the central nervous system, the longer the
incubation period.
 The shorter the incubation period, the more
severe the symptoms.
 In neonatal tetanus, symptoms usually appear
from 4 to 14 days after birth, averaging about
7 days.
 This is the most common type of tetanus,80% of cases.
 Descending pattern.
 The first sign is trismus, or lockjaw,
 Facial spasms called risus sardonicus,
 Followed by stiffness of the neck,
 Difficulty in swallowing, and
 Rigidity of pectoral and calf muscles.
 Spasms may occur frequently and last for several minutes
with the body shaped into a characteristic form
called opisthotonos.
 Spasms continue for up to four weeks, and complete
recovery may take months.
 Sympathetic overactivity (soa) is common in severe tetanus
and
 Death can occur within four days.
 This is a form of generalized tetanus that occurs
in newborns.
 Infants who have not acquired passive
immunity because the mother has never been
immunized are at risk.
 It usually occurs through infection of the
unhealed umbilical stump, particularly when the
stump is cut with a non-sterile instrument.
 Neonatal tetanus is common in many developing
countries and is responsible for about 14%
(215,000) of all neonatal deaths, but is very rare
in developed countries.

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tetanusgasgangrene-131211041853-phpapp02.pdf

  • 2.  Tetanus ( "to stretch") is a medical condition characterized by a prolonged contraction of skeletal muscle fibers due to an EXOTOXIN produced by C.Tetani
  • 3.  Contaminated wounds  Deep wounds  Devitalized (dead) tissue  Puncture wounds, such as those caused by nails, splinters, or insect bites  BURNS pt  Any break in the skin  Injection-drug sites.  Newborn child (by means of the uterus after delivery and through the umbilical cord stump).
  • 4.  Up to several months, but is usually about 14 days.  In general, the further the injury site is from the central nervous system, the longer the incubation period.  The shorter the incubation period, the more severe the symptoms.  In neonatal tetanus, symptoms usually appear from 4 to 14 days after birth, averaging about 7 days.
  • 5.  This is the most common type of tetanus,80% of cases.  Descending pattern.  The first sign is trismus, or lockjaw,  Facial spasms called risus sardonicus,  Followed by stiffness of the neck,  Difficulty in swallowing, and  Rigidity of pectoral and calf muscles.  Spasms may occur frequently and last for several minutes with the body shaped into a characteristic form called opisthotonos.  Spasms continue for up to four weeks, and complete recovery may take months.  Sympathetic overactivity (soa) is common in severe tetanus and  Death can occur within four days.
  • 6.  This is a form of generalized tetanus that occurs in newborns.  Infants who have not acquired passive immunity because the mother has never been immunized are at risk.  It usually occurs through infection of the unhealed umbilical stump, particularly when the stump is cut with a non-sterile instrument.  Neonatal tetanus is common in many developing countries and is responsible for about 14% (215,000) of all neonatal deaths, but is very rare in developed countries.
  • 7.  This is an uncommon form of the disease, in which patients have persistent contraction of muscles in the same anatomic area as the injury.  The contractions may persist for many weeks before gradually subsiding.  Local tetanus is generally milder; only about 1% of cases are fatal, but it may precede the onset of generalized tetanus.
  • 8.  This is a rare form of the disease, occasionally occurring with otitis media (ear infections) in which C. tetani is present in the flora of the middle ear, or following injuries to the head.  There is involvement of the cranial nerves, especially in the facial area.
  • 9.  Tetanospasmin/Potent neurotoxin  Also called spasmogenic toxin, or TeNT.  The LD50 of this toxin has been measured to be approximately 1 ng/kg, making it second only to Botulinum toxin D as the deadliest toxin in the world  Tetanus toxin causes violent spastic paralysis by blocking the release of γ-aminobutyric acid.  γ-aminobutyric acid is a neurotransmitter that inhibits motor neurons.[
  • 11.  Act by inhibiting release of cholinesterase  Act at spinal level & cause contraction due to minor stimuli  Toxin fixed to nervous tissue cannot be neutralised
  • 12.  Spatula test :involves touching the posterior pharyngeal wall with a sterile, soft-tipped instrument and observing the effect.  A positive test result is the involuntary contraction of the jaw (biting down on the "spatula")  Negative test result would normally be a gag reflex attempting to expel the foreign object
  • 13.  Mild tetanus[edit]  Mild cases of tetanus can be treated with:[17]  tetanus immunoglobulin IV or IM  metronidazole IV for 10 days  diazepam  Severe tetanus[edit]  Severe cases will require admission to intensive care. In addition to the measures listed above for mild tetanus:[17]  Human tetanus immunoglobulin injected intrathecally (increases clinical improvement from 4% to 35%)  Tracheotomy and mechanical ventilation for 3 to 4 weeks. Tracheostomy is recommended for securing the airway, because the presence of an endotracheal tube is a stimulus for spasm  Magnesium, as an intravenous (IV) infusion, to prevent muscle spasm  Diazepam as a continuous IV infusion  The autonomic effects of tetanus can be difficult to manage (alternating hyper- and hypotension hyperpyrexia/hypothermia) and may require IV labetalol, magnesium, clonidine, or nifedipine  Drugs such as diazepam or other muscle relaxants can be given to control the muscle spasms. In extreme cases it may be necessary to paralyze the patient with curare-like drugs and use a mechanical ventilator.  In order to survive a tetanus infection, the maintenance of an airway and proper nutrition are required. An intake of 3,500 to 4,000 calories, and at least 150 g of protein per day, is often given in liquid form through a tube directly into the stomach (percutaneous endoscopic gastrostomy), or through a drip into a vein (parenteral nutrition). This high-caloric diet maintenance is required because of the increased metabolic strain brought on by the increased muscle activity. Full recovery takes 4 to 6 weeks because the body must regenerate destroyed nerve axon terminal