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as well as how this relates to respiratory pathologies such as emphysema and pulmonary fibrosis.",{"id":215,"name":216},1,"Course previews",[218,228,233,238,245],{"type":219,"data":220},"video",{"readDurationInSeconds":221,"video":222},224,{"platform":223,"name":212,"url":224,"size":225},"YouTube","https:\u002F\u002Fwww.youtube.com\u002Fwatch?v=tDsK0eyuhAk",{"width":226,"height":227},200,113,{"type":229,"data":230},"free_text",{"readDurationInSeconds":231,"text":232},14.4,"\u003Cp>Fick's law describes the process whereby gas movement across the alveolar-capillary membrane occurs through the process of diffusion. In this video, from our Blood Gas Analysis Essentials course, you'll learn about the impact of diffusing capacity and other factors that affect gas transfer across membranes, as well as how this relates to respiratory pathologies such as emphysema and pulmonary fibrosis.\u003C\u002Fp>",{"type":229,"data":234},{"readDurationInSeconds":235,"title":236,"text":237},16.533333333333335,"Join our Blood Gas Analysis Essentials course today!","\u003Cp>Master arterial blood gas analysis based on an understanding of relevant physiological principles. You’ll cover the crucial factors that determine the oxygenation of blood in the lungs, as well as oxygen transport and delivery to peripheral tissues. Learn about the interplay between blood gas and acid-base analysis and how carbon dioxide affects arterial pH. This course complements our \u003Ca href=\"https:\u002F\u002Fwww.medmastery.com\u002Fcourse\u002Facid-base-essentials\">Acid-Base Essentials\u003C\u002Fa> course.\u003C\u002Fp>",{"type":239,"data":240},"cta",{"readDurationInSeconds":241,"text":242,"buttonText":243,"buttonUrl":244},3.466666666666667,"Become a great clinician with our video courses and workshops","Start learning for free","https:\u002F\u002Fwww.medmastery.com\u002Fuser\u002Fregister",{"type":229,"data":246},{"readDurationInSeconds":247,"title":248,"text":249},94.39999999999999,"Video transcript","\u003Cp>The alveolar surface area of the lung is quite expansive, and contains an extensive network of pulmonary capillaries, making it ideal for gas exchange. Gas movement across the alveolar capillary membrane occurs by diffusion. And this process is described by Ficks law, flux of a gas equals the diffusing capacity of the membrane times the pressure gradient across the membrane.\u003C\u002Fp>\u003Cp>According to Ficks law, the rate of gas transfer across a tissue playing or membrane is directly proportional to the difference in partial pressures of the gas on the two sides of the membrane. And the membranes diffusing capacity. The diffusing capacity of a membrane is dependent on several components, tissue plane or membrane area, tissue thickness, solubility of the gas and the molecular weight of the gas.\u003C\u002Fp>\u003Cp>And now if we substitute the equation for diffusing capacity back into Ficks law, we get this equation. So to reiterate, there are a number of factors that can influence the movement or flux of gas molecules across the membrane, the surface area of the membrane, the thickness of the membrane, the solubility of the gas, the molecular weight of the gas, and the driving pressure gradient across the membrane.\u003C\u002Fp>\u003Cp>From the looks of the formula, it may seem a little complex, but the changes are fairly intuitive. Let's consider each component individually. Diffusion is enhanced if there's more membrane surface area available for gas transfer. Diffusion is enhanced if membrane thickness is reduced, constituting a shorter path length for gas transfer.\u003C\u002Fp>\u003Cp>Similarly, diffusion is enhanced if the gas has greater solubility in the membrane. And diffusion is enhanced with a lighter gas that is a gas of lower molecular weight. Finally, diffusion is enhanced if there is a greater driving pressure across the membrane. And we can apply this to the movement of gas, let's say oxygen across the alveolar capillary membrane.\u003C\u002Fp>\u003Cp>So, loss of alveolar surface area, as seen in emphysema will decrease diffusion of oxygen into the lung. Similarly, an increase in the thickness of the alveolar wall, as seen in pulmonary fibrosis will limit diffusion of oxygen. And a decrease in the partial pressure of oxygen in inspired gas will reduce the pressure gradient for oxygen diffusion across the lung.\u003C\u002Fp>\u003Cp>So hope you liked this video. Absolutely. Make sure to check out the course this video was taken from and to register for a free trial account which will give you access to select the chapters of the course. If you want to learn how Medmastery can help you become a great clinician, make sure to watch the about mastery video. 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Learn who to screen and when, which measures to request, and how to stratify risk.",{"alt":315,"title":289,"size":316,"location":318},"Lipid panel blood sample tubes used to test for hyperlipidemia in a laboratory setting",{"width":317,"height":317},600,{"bucket":293,"key":319},"\u002F2026-04\u002FC121_magazine image.png",{"id":296,"title":297,"relativeURL":298,"image":299,"professionLong":300,"profession":321,"weight":303},{"name":302},"\u002Fmagazine\u002Ftest-for-hyperlipidemia",246,"5m",{"created":326,"updated":327,"published":328},1777403036,1777572381,1777412421,{"id":330,"title":331,"text":332,"image":333,"author":338,"path":347,"readDuration":348,"readDurationFormatted":349,"internal":350},1347,"Outpatient care for COPD exacerbations","Most acute COPD exacerbations can be managed with outpatient treatment. Learn how to treat mild and moderate COPD exacerbations—and when to escalate care.",{"alt":334,"title":289,"size":335,"location":336},"Older patient using a handheld nebulizer to inhale bronchodilator medication during an acute COPD exacerbation",{"width":317,"height":317},{"bucket":293,"key":337},"\u002F2026-04\u002FC133(4)_ exacerbations_magazine image.png",{"id":339,"title":340,"relativeURL":341,"image":342,"professionLong":343,"profession":344,"weight":346},5365,"Siamak Moayedi, MD","\u002Fteachers\u002Fsiamak-moayedi-md","https:\u002F\u002Fmedmastery-backend-prod-kjbeds.s3.eu-west-1.amazonaws.com\u002Fmedia\u002Fimages\u002F9c43cf02-1064-4074-817b-0eb5de6ded74","Professor and Director of Medical Student Education, University of Maryland and Course Director, Essential and Critical Procedures, Emergency Medicine.",{"name":345},"Emergency medicine physician",1533,"\u002Fmagazine\u002Facute-copd-exacerbation-treatment",191,"4m",{"created":351,"updated":352,"published":353},1776705362,1776710540,1776710541,{"seo":355,"og":357},{"title":356,"description":213},"Simplifying Fick's law and lung gas exchange | Medmastery",{"title":356,"description":213,"image":358},{"alt":289,"title":289,"size":359,"location":362},{"width":360,"height":361},606,364,{"bucket":293,"key":363},"\u002Fmigrated-images\u002Fblood-gas-mag-preview-2_1-2x.png",{"id":365,"created":366,"updated":367,"published":366},339,1585047966,1655189586]