understanding hypoxia in a simple and easy manner

1. HYPOXIA

2. Objective
 At the end of the lecture to be able to define hypoxia.
 To be able to describe its causes , signs and
symptoms
 Also to be able to comprehend about the treatment.

3. Definition
Reduced availability of O2 in tissues.
Usually irreversible , affects vital organs (brain, heart etc.,)
Lack of oxygen to brain tissues can be fatal
Anoxia- refers to absence of oxygen

4. cause
 Low Po2 in arterial blood. (hypoxic hypoxia)
 Inability of blood to carry o2. (anaemic hypoxia)
 Decreased velocity of blood to tissue.(stagnant hypoxia)
 Inability of tissues to utilize oxygen.(histotoxic hypoxia)

5.  High altitude
 Hypoventilation (Airway obstruction)
 Anaemia
 Altered Hb
 Intravascular obstruction
 Haemorrhage
 Cyanide poisoning

6. Signs & Symptoms
 Headache
 Dyspnoea
 syncope
 Increased in heart rate and breath rate
 Sluggishness
 Impaired motor coordination
 Impaired visibility

7. Treatment
 Oxygen therapy
 1atm of o2 can be tolerated about 5-8 hrs in patients.
 Not equally effective in all types
 100% useful in hypoxic hypoxia
 70% in anaemic
 50% in stagnant
 Nil in histotoxic

8. Thank you