logging in or signing up Resp. 3. Compliance husanbano Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 92 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: October 19, 2013 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript Compliance Of Lung And Thorax: Compliance Of Lung And Thorax Husan Bano Associate Professor Department Physiology Al-Tibri Medical College Isra University Karachi Campus Learning Objectives : Learning Objectives At the end of this lecture you should be able to: 1. know the significance of intra-alveolar, intrapleural and trans-pulmonary pressure in process of respiration. 2. define the compliance of lung and thorax . 3. explain the factors affecting on compliance of lung and thorax REVIEW OF PULMONARY PRESSURES: REVIEW OF PULMONARY PRESSURES Intra-alveolar pressure Intra-pleural pressure 3. Trans-pulmonary pressure REVIEW OF PULMONARY PRESSURES: REVIEW OF PULMONARY PRESSURES Definition: Pressure inside the alveoli. During normal quiet inspiration= -1mmHg During normal quiet expiration= +1mmHg with respect of atmospheric pressure 1. Intra-alveolar Pressure REVIEW OF PULMONARY PRESSURES: REVIEW OF PULMONARY PRESSURES Difinitation: Pressure inside the pleural space. 2 . Intra-pleural pressure resting state of lungs = - 5cm H2O During normal quiet inspiration = - 7.5 cmH2O In expiration goes back = - 5cmH2O Also called recoil pressure Why intra-plural pressure is called “Recoil Pressure”: Why intra-plural pressure is called “Recoil Pressure” Recoil pressure means the pressure which is required for the contraction of lung or expiration. Resting - 5 CmH2O Inspiration - 7.5 CmH2O Expiration - 5 CmH2O 3. Trans-pulmonary Pressure: 3. Trans-pulmonary Pressure Trans-pulmonary pressure is the pressure difference between inside and outside of the lungs. It is difference between intra-alveolar and intra-pleural pressure It determines the degree of inflation of the lungs. COMPLIANCE OF LUNG AND THROAX: COMPLIANCE OF LUNG AND THROAX During inspiration, the lung expanded which expand the thoracic cavity. The expansibility of lungs and thorax is called compliance. Compliance: Compliance It is expressed as that “the volume of air in the lungs increases with each unit increase in intra-alveolar/intra-pleural pressure. - 1mmHg -2mmHg - 3mmHg 110 ml air 220 ml air 330 ml air Compliance: Compliance The compliance of normal lungs and thorax together is about 110 ml/cmH2O pressure. It means that every time when alveolar pressure increase by 1cm of H2O , the lungs expanded 11o ml . Compliance: Compliance Compliance in the lungs is defined as a change in volume divided by a change in trans-pulmonary pressure CL = ΔV / ΔPL. The compliance of lung alone is 200 ml/cm H20 . Lung compliance is higher at the base of the lung and lower at the apex of the lung. Compliance Diagram: Compliance Diagram Factors That Causes Abnormal Compliance: Factors That Causes Abnormal Compliance Any disease which destroy the lung tissues causes decrease lung compliance. eg Cancer of lung ( Lung of smoker ) Tuberculosis of lung Fibrosis of lung Factors That Causes Abnormal Compliance: Factors That Causes Abnormal Compliance 2. Any disease which depress the rib cage, causes the decrease lung compliance. eg 4. Excessive round back 3. scoliosis 1. Fibrosis of respiratory muscle 2. Paralysis of respiratory muscle Work of Breathing: Work of Breathing Inspiration is an active process which requires energy. This energy is utilized in performing the 3 different types of work. Compliance work Tissue resistance work. Airway resistance work. Work of Breathing: Work of Breathing In pulmonary diseases, all 3 types of work increases. e.g. Compliance work and Tissue resistance work increases in fibrosis of lung , Airway resistance work increases in all air way obstructed diseases. During expiration no such work performed because expiration is passive process. PowerPoint Presentation: Thanks You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.