Pf Ts  Overview
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Pf Ts Overview Presentation Transcript

  • 1. Pulmonary Function Tests An Overview Dr. Taher El Naggar Professor of Pulmonary Medicine Ain Shams University
  • 2.
    • What is Respiration ?
  • 3.
    • It is a process by which cells utilize O2 produce Co2 & exchange the gases with atmosphere.
  • 4.
    • External respiration
    • a) Pulmonary ventilation
    • b) Gas exchange across alveolar capillary
    • membrane.
    • c) Carriage of O2 & CO2
    • Internal respiration
    • Exchange of O2 & CO2 between blood & tissues.
  • 5. This achieved by :
    • (1) VENTILATION :
    • not only adequate in quantity ( minute ventilation is 4 liters) ,but be efficiently distributed to all perfused alveoli.
  • 6.
      • (2) PERFUSION :
    • Pulmonary capillary blood flow being delivered in adequate volume (5Liters/m) and distributed efficiently to all ventilated alveoli.
  • 7.
      • (3) DIFFUSION :
    • It is concerned with the volume of gas transferred across the alveolar capillary membrane.
    • When expressed in terms of time and unit difference in partial pressure of the gas (ml/min/mm Hg) is known as diffusing capacity.
  • 8. Factors affecting diffusion:
    • Pressure gradient of the gas.
    • Solubility of the gas.
    • Surface area of the pulmonary membrane.
    • Thickness of the pulmonary membrane.
    • Ventilation perfusion ratio.
  • 9.  
  • 10. Pulmonary function testing serves 2 important clinical goals:
    • (1) categorizing the physiologic impairment from lung disease (i.e., obstructive, restrictive, etc).
    • (2) quantifying the degree of functional impairment.
  • 11.
    • Spirometry :
    • The most common pulmonary function test.
    • It is quick, easy and non-invasive.
  • 12. The more common lung function values measured with spirometry are :
    • Forced vital capacity (FVC).
    • Forced expiratory volume (FEV).
    • Forced expiratory flow 25% to 75%.
    • Peak expiratory flow (PEF).
    • Maximum voluntary ventilation.
  • 13. Gas diffusion tests
    • Gas diffusion tests include :
    • Carbon monoxide diffusing capacity ,
    • Two different methods are used for this test. The single-breath or breath-holding method.
  • 14. Body plethysmography
    • Body plethysmography may be used to measure:
      • Total lung capacity (TLC).
      • Residual volume (RV) .
  • 15. Inhalation challenge tests
    • These tests are also called provocation studies.
    • Inhalation challenge tests are done to measure the response of airways to allergens that may be causing asthma.
  • 16. Exercise stress tests
    • Exercise stress tests evaluate the effect of exercise on lung function tests.
    • Spirometry readings are done after exercise and then again at rest.
  • 17.
    • THANK YOU