Test for Tidal Volume and Lung Capacity

DETERMINATION OF TIDAL VOLUME AND VITAL CAPACITY AIM So determine tidal volume and vital capacity. PRINCIPLE Although many sopharticated tests is a simple and vital capacity is are available for assessing respiratory functions useful measurement for assessing of the lungs in health and disease the ventilatory functione NEASUREMENT Vital capacity may be measured either on a simple spirometer di a recording spiser A. Simple spirometer is a common low-cost instrument, either a mettatic or a bellows type weed in colleges hospitales, sports, facilities and gymnalia. B. Recording eprometer is a sophisticates, electrically driven, recording system wed in the respiratory physiology laboratories hospitale etc. It provides a graphic record of various lung volumes and capacities. C. Wright's peak flow meter. is a small portable instrurrent which can give information about the state of respiratory passages. Definitions and Penkinologies The rate: The ente of respiration is sofrewath variable even at rest, varying free 12-16/rin. However, when one becomes conscious of one's breathing it may goo ip. slow down, al show a temporary dististance in ite rate, depth and rythre. The respiratiy ucle: "There is a cycle of inepration, expitiation and a pause. The deration of the paule ratives inversely with the rate. Lung velures and capacities: oshe velurre of air in the lungs changer considerably diving a respiratory cycle. However, for convinience 4 lung volumes and 4 lung capacities are distinguished. Lung Volurees 1. Pidal velure is a amount of ans that Moves into the wage with cord inspiration during normal quiet breathing." It arounte to about 500. 19. Inspiratory reserve volurre is the extra volume of air that can be inspired Aver and above the normal tidal volure, with maximum epport It arrounte to about 2500 13. Expiratory reedve vodurre is the extra amount of air that can be expelled by forceful expiration from the spontaneous and expiratory point, ie over and above the normal tidal expitiation. It amounts to about 1100rrh 4. Residual volume is the amount of air that remaine behind in the linge after a Maxi Mum voluntary expiration.. It arrounts to 1100 ml. The bungs connot be be emptied out completely of air even with maxireure effort because as the pressure orteide the small air passage increases, they de comprases and thee block the flow of ais out of the lungs. Lung Capacities 1. Vital Capacity is the largest volume of air a person can expel from the lunge with Moxicure offert after first filling the lungs fully by a deepest posible inspiration. It omounts to 3.5 to 55 liters. 12. Inspiratory Capacity is the maximum arount of air that a person con brentle in with Maxircury ffort starting pror the normal expirately point. It arounts to abert 30000 3. Functional Residend Capacity is the amount of ais remaining in the lings at the end of a deepest possible inspiration. It accounts to about 2500 ML. 4. Total lung capacity is the volume of air that is present in the lungs at the end of a "deepest possible inspiration. It is a reasure 4900-6000 ML. of VC +RV, and amounts to Minute Ventilation is the orount of is that is breathed in or breathed out per minute when the person is at rest. It around to 6-8 litere/min. Apparatus and Materials: Spirometer; potassium permanganate solution. Spirometer: It consists of filled with water bell is attochel a double walled metal cylindrical chamber, having an outer containe in which a light-retal gae bell of 6-liter capacity floate. The on its upper surface to a chain which passes over a graduated frictionless pulley. The pully bears a spring mounted indicator neelle that moves with the bell is pully and indicates the volume of air present in the bell. She gal counterpoises by a weight attached to the other end of the chain. This weight allows a emooth up and down movement of the bell. The inlet tube, throug which air moves into di bearing a out of the bell, is corrugatel canval-rubber tubing Mouthpiere. When air is blown into the intet tube it raises the ball, the water osting of on airtight seal. REPORT: Sidal volume and Vital Capacity was determined and repetited.