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Asphyxia

Asphyxia. Dr. Raid Jastania. Asphyxia. Condition of lack of oxygen Usually obstructive Any level: nose, mouth… alveoli. Asphyxia. Classical Features: Congestion of the face Edema of the face Cyanosis of the skin of the face Petechial hemorrhages in the skin of the face and eyes.

  • asphyxia
  • traumatic asphyxia
  • external pressure
  • strangulation blockage
  • traumatic asphyxia restriction
  • external pressure preventing respiration
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Asphyxia

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  1. Asphyxia Dr. Raid Jastania

  2. Asphyxia • Condition of lack of oxygen • Usually obstructive • Any level: nose, mouth… alveoli.

  3. Asphyxia • Classical Features: • Congestion of the face • Edema of the face • Cyanosis of the skin of the face • Petechial hemorrhages in the skin of the face and eyes. • Petechial hemorrhages of internal organs: lungs, pericardium, thymus..

  4. Asphyxia • Sequence of events: • Increase efforts to breathe, congestion, cyanosis • Deep respiration, petechiae • Loss of consciousness, possible convulsions, vomiting.. • Reduction in breathing, brain damage

  5. Definitions • Suffocation: lack of oxygen in the inspired air • Smothering: blockage of external orifices • Gagging/Choking: blockage of internal airways • Strangulation: blockage of internal airways by external pressure • Traumatic asphyxia: restriction of chest movement

  6. Suffocation • Accumulation of irrespirable gas • Deep tanks, ships, deep wells.. • Plastic bag on head • Manner: • Accidental (common) • Suicidal • Homoside

  7. Smothering • With a pillow or hand pressed over nose and mouth • Sings of asphyxia can be minimal: old age, infants • Sings of struggle: injuries on the face • Manner: • Homoside • accidental

  8. Gagging • Cloth or soft object in the mouth. • Person can breathe from nose, but if secretions accumulate in the nose and pharynx, asphyxia can happen • Manner: • Accidental • homicide

  9. Choking • Obstruction of the upper airway by object in the pharynx or larynx • Food, toys, dentures • Manner: • Accidental • Increased risk in: • Sedation • Anasthesia • Alcohol • Drugs • Metal disease

  10. Pressure on the Neck • Manual strangulation • Ligature strangulation • Hanging

  11. Pressure on the Neck • What happen: • Obstruction of jugular veins, congestion, cyanosis • Obstruction of carotid artery, cerebral ischemia • Stimulation of baroceptors in carotid sinus, vagal effect on heart • Closing airway at pharynx by the tongue and larynx • ?? Close airway at trachea level

  12. Manual Strangulation • Pressure on neck by single for both hands • Common mode of homicide • Man against woman or child • Abrasion, bruises on neck • Injuries of neck soft tissue • ? Bleeding into posterior neck tissue can be normal at autopsy

  13. Ligature Strangulation • Constricting band in tightened around the neck • Manner: • Homicide • Accidental • Sings of asphyxia: marked congestion, cyanosis, and petechiae • Rope, wire, cloth.. • Ligature mark: usually above the laryngeal prominence • Look for knots, cross over point

  14. Hanging • Self-suspension • Need not to be from high point • Can be in sitting or kneeling • Weight of the body is enough to cause pressure on the neck • Signs of asphyxia • Suspension point • Manner: • Suicide in male • accidental

  15. Traumatic Asphyxia • External pressure preventing respiration • Signs of asphyxia • Postural asphyxia

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