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)
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