1. Definition & classification of Asphyxia
2. Anatomy of Asphyxia
3. Biochemistry of Asphyxia
4. Pathology of Asphyxia
5. Types of Mechanical Asphyxia & their
Asphyxia (Greek) literally means “absence
of pulse”. But in broader sense, it refers to
a state in which body becomes deprived of
Asphyxia can be defined as “a method of
rendering the tissue hypoxic”.
Asphyxia is also defined as ‘state of
impaired transfer of oxygen to the lungs”.
ROUTE OF OXYGEN
• Hypoxia is defined as “State of
reduced oxygen supply to the
Types Of Hypoxia
1. Hypoxic Hypoxia
2. Anaemic Hypoxia
3. Stagnant or Ischaemic Hypoxia
4. Histotoxic Hypoxia
CLASSIFICATION OF ASPHYXIA
Basically there are two types:
Flow of oxygen into the body is interfered
through some physical impediments.
f) Traumatic asphyxia
Supply of oxygen to the body is
interfered through some
or disease process.
a) Environmental Asphyxia
b) Toxicological Asphyxia
c) Pathological Asphyxia
d) Iatrogenic Asphyxia
ANATOMY OF ASPHYXIA
Table: Rope Tension Required to
Occlude Tubular Structures in the Neck
Tension (kg) Tension (Lb)
Least Tension needed
to occlude all the neck
needed to occlude all
the neck structures
OF DEATH IN ASPHYXIA
• Cerebral Anoxia/Hypoxia.
• Hypoxic Hypoxia/Anoxic Anoxia.
• Cardiac Arrhythmia.
CEREBRAL ANOXIA / HYPOXIA
• Most common mechanism.
• Occurs due to compression of
jugular veins, with or without that
of the carotid arteries.
• Death occurs within few minutes.
HYPOXIC HYPOXIA/ANOXIC ANOXIA
It is contributory factor in some hangings
where the Hyoid bone and tongue are
pushed upwards and backward against the
Laryngo – Pharyn