Stethograph- Recording Respiratory Movements

Physiology practical best

1. STETHOGRAPHY STUDY OF RESPIATORY MOVEMENTS By Satyanath Reddy . K

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.

3. STETHOGRAPH

4. STETHOGRAPH

5. STETHOGRAPH

6. 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.

7. 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

8. Effect of swallowing

9. Effect of voluntary hyperventillation

10. Effect of exercise

11. Effect of breath holding time

12. BREATH HOLDING

13. Effect of sneezing, coughing, laughing, talking

14. DEGLUTATION APNOEA