2. •Stethography is the process of recording of
respiratory movements in man. The instrument
used is called stethograph and the recording
obtained is called stethogram
•The stethograph is a corrugated rubber tube, closed at
both ends. The cavity of the tube is connected to a
tambour by a noncompressible tube. Stretch on the
corrugated rubber tube increases the volume which
reduces the pressure in the system which pulls the drum of
the tambour down. A pen on the tip of the pointer,
connected to the tambour, writes on a moving drum which
gives the pattern of the changes in the volume in the
system. When the stethograph applied to the chest of a
person, the chest movements can be recorded.
8. PROCEDURE
Stethography means recording the movements
of the chest occurring during respiration. It is
a very simple procedure which can illustrate a
large number of facts about the respiratory
physiology. The following are some important
features which can be elicited.
9. 1.The subject was asked to sit comfortably on a
stool with his/her back towards the recording
apparatus.
2.The stethograph was tied around the chest of
the subject at the level of the fourth
intercostals space and the tambour...
3.The writing lever/pen was brought in contact
with the paper of the kymograph and the
drum was set to move at slow...
4.Normal respiration was recorded for about
5cm