{"id":1648,"date":"2020-06-19T16:14:22","date_gmt":"2020-06-19T20:14:22","guid":{"rendered":"https:\/\/dan.devhammer.com\/?post_type=dan_health_resources&#038;p=1648"},"modified":"2022-06-20T15:45:03","modified_gmt":"2022-06-20T19:45:03","slug":"introduction","status":"publish","type":"dan_health_resources","link":"https:\/\/world.dan.org\/fr\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/","title":{"rendered":"Chapitre 1 : Introduction \u00e0 l'accident de d\u00e9compression"},"content":{"rendered":"<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-medium-font-size\">&#8220;<strong><em>One of the hazards associated with underwater diving is decompression sickness (DCS), caused by uncontrolled release of gas from tissues during or after surfacing.\u201d<\/em><\/strong><\/p>\n\n\n\n<p>Diving is a popular recreational pastime as well as an activity with numerous practical applications in the scientific, commercial, military and exploration realms. While diving can be done safely, it is essential for all divers \u2014 no matter what their reason for diving \u2014 to appreciate that the underwater environment is unforgiving. Problems may arise during a dive due to insufficient medical or physical fitness, improper use of equipment or inadequate management of the high-pressure environment.<\/p>\n\n\n\n<p>One of the hazards associated with the pressurized underwater setting is decompression sickness (DCS), a condition also known as \u201cthe bends.\u201d This chapter explains the basics of DCS, while subsequent chapters provide details regarding its manifestation and management, risk factors that may predispose you to the condition and preventive steps that you can take to minimize your chance of developing it.<\/p>\n\n\n\n<p>Dans ce chapitre, vous apprendrez ce qui suit :<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li><a href=\"#physio-mech-dcs\">The Physiological Mechanisms of DCS<\/a><\/li><li><a href=\"#predict-gas-uptake-elim\">Predicting Gas Uptake and Elimination<\/a><\/li><\/ul>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-background has-dan-light-gray-background-color has-dan-light-gray-color\"\/>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"physio-mech-dcs\">The Physiological Mechanisms of DCS<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Tension des tissus<\/h3>\n\n\n\n<p>When a diver is exposed to an environment of elevated pressure, inert gases (nitrogen, for example) accumulate in tissues. The deeper a dive is, the faster the body\u2019s absorption, or \u201cuptake,\u201d of such gases. When the diver ascends, the drive is reversed, and gas leaves tissues. A diver\u2019s ascent must be controlled to allow for an orderly elimination, or \u201cwashout,\u201d of the accumulated gas. A slow ascent, conducted either continuously or in stages, usually allows for safe decompression, whereas a too rapid ascent following gas accumulation can sometimes result in DCS.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/physiological-mechanisms-of-dcs-pressure-profile-chart-DAN-800x500-1.jpg\" alt=\"\" class=\"wp-image-11932\" srcset=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/physiological-mechanisms-of-dcs-pressure-profile-chart-DAN-800x500-1.jpg 800w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/physiological-mechanisms-of-dcs-pressure-profile-chart-DAN-800x500-1-360x225.jpg 360w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/physiological-mechanisms-of-dcs-pressure-profile-chart-DAN-800x500-1-768x480.jpg 768w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/physiological-mechanisms-of-dcs-pressure-profile-chart-DAN-800x500-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption>La pression de l'air augmente lentement, passant de z\u00e9ro \u00e0 la limite de l'espace \u00e0 une atmosph\u00e8re (14,7 psi) au niveau de la mer ; la pression de l'eau augmente de fa\u00e7on beaucoup plus spectaculaire, ajoutant une atmosph\u00e8re de pression pour chaque 33 pieds d'eau de mer.<\/figcaption><\/figure><\/div>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>The concentration, or \u201ctension,\u201d of dissolved inert gas within your body\u2019s tissues is a function of ambient pressure \u2014 that is, the pressure of the environment surrounding you at any given time. The inert gases that are not used in your body\u2019s metabolic reactions normally exist in equilibrium with your ambient environment \u2014 in the same concentration as in the air around you. Tissues under such conditions are described as \u201csaturated.\u201d Minor pressure changes, such as those created by shifting weather conditions, produce minor pressure variations in atmospheric gases that are then matched by pressure changes in the gases in the body\u2019s tissues. When a pressure difference, or \u201cgradient,\u201d is created, molecules from the area of higher concentration flow toward the area of lower concentration until balance is re-established. Since all of us constantly experience minor changes and corrections of this nature, the gas tension in our bodies is in a state of dynamic, rather than static, equilibrium \u2014 even before diving is added to the equation.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Pression<\/h3>\n\n\n\n<p>The diving environment puts a significant additional burden on this adaptive mechanism. Here\u2019s why: Pressure is measured using a unit known as an \u201catmosphere.\u201d There is no actual physical boundary between the Earth\u2019s atmosphere and space, but the atmosphere is often considered to extend 62 miles (100 kilometers) from sea level to the edge of outer space. The pressure produced by this entire column of gas acting at sea level is one atmosphere, equal to 14.7 pounds per square inch (psi) or 101.3 kilopascals (kPa). By comparison, the change in pressure underwater increases by one atmosphere for every 33 feet of saltwater and every 34 feet of freshwater. As a result, any variation you experience in surface atmospheric pressure is extremely modest compared with the variation in pressure you can undergo when you travel vertically underwater; this can create huge gradients in the uptake of gases during your descent and in their elimination during your ascent.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u00c9change de gaz<\/h3>\n\n\n\n<p>Vos poumons constituent le principal lien entre votre corps et l'environnement dans lequel vous vous trouvez \u00e0 tout moment. Lorsque vous vous exposez \u00e0 une pression accrue sous l'eau, le gaz contenu dans vos poumons est comprim\u00e9. Cela cr\u00e9e un gradient entre les poumons et la circulation sanguine et, par la suite, entre la circulation sanguine et les tissus qui sont perfus\u00e9s ou aliment\u00e9s en sang oxyg\u00e9n\u00e9. Vos tissus absorberont du gaz inerte jusqu'\u00e0 ce que le gradient soit \u00e9limin\u00e9, un \u00e9tat effectif d'\u00e9quilibre, ou de saturation, avec la pression environnementale environnante. Il faut une longue exposition pour atteindre la saturation compl\u00e8te, mais une fois qu'elle est atteinte, le fait de rester plus longtemps n'augmente pas l'absorption de gaz ni la d\u00e9compression n\u00e9cessaire.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-text-color has-background has-dan-light-gray-background-color has-dan-light-gray-color\"\/>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"predict-gas-uptake-elim\">Predicting Gas Uptake and Elimination<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Compartiments tissulaires<\/h3>\n\n\n\n<p>This natural physiological mechanism can be predicted by a series of mathematical algorithms based on \u201chalf-time compartments,\u201d which approximate the exponential uptake and elimination patterns expected in various types of perfused tissues. The key to these algorithms is that different parts of the body take up and eliminate inert gases at differing rates \u2014 for example, blood is considered a \u201cfast compartment\u201d and bone a \u201cslow compartment.\u201d (The term \u201ccompartment\u201d is not meant as an exact referent for these tissues but, rather, as a mathematical construct to estimate what happens in various parts of the body.)<\/p>\n\n\n\n<p>Les tissus les plus rapides sont les poumons, qui atteignent l'\u00e9quilibre presque instantan\u00e9ment. Le sang suit en vitesse, puis le cerveau. Les tissus les plus lents sont ceux qui sont relativement mal irrigu\u00e9s, comme les ligaments et le cartilage, ou ceux qui ont une grande capacit\u00e9 d'absorption des gaz inertes, comme la graisse dans les zones mal irrigu\u00e9es. L'utilisation d'un algorithme math\u00e9matique pour estimer l'\u00e9tat des tissus s'explique par le fait qu'il n'est pas encore possible de mesurer directement l'absorption ou l'\u00e9limination dans des tissus sp\u00e9cifiques.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"500\" src=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/inert-gas-uptake-tissues-chart-DAN-800x500-1.jpg\" alt=\"\" class=\"wp-image-11931\" srcset=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/inert-gas-uptake-tissues-chart-DAN-800x500-1.jpg 800w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/inert-gas-uptake-tissues-chart-DAN-800x500-1-360x225.jpg 360w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/inert-gas-uptake-tissues-chart-DAN-800x500-1-768x480.jpg 768w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/inert-gas-uptake-tissues-chart-DAN-800x500-1-18x12.jpg 18w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><figcaption>Pour un tissu th\u00e9orique dont la dur\u00e9e est de 10 minutes, 50 % de la diff\u00e9rence est \u00e9limin\u00e9e au cours des 10 premi\u00e8res minutes, puis 25 % au cours des 10 minutes suivantes (la moiti\u00e9 des 50 % restants), puis 12,5 % au cours des 10 minutes suivantes, et ainsi de suite.<\/figcaption><\/figure><\/div>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>An example may demonstrate how the algorithms work. Let us imagine a diver who has been instantly displaced from the surface to a fixed depth \u2014 effectively, a fixed pressure \u2014 and let us say that in this particular dive scenario, a fast compartment has a half-time of five minutes. In such a case, the first five minutes of exposure to the higher pressure would result in sufficient inert gas uptake to eliminate half of the difference produced by the pressure gradient (50 percent, in other words); this is the steepest portion of the uptake curve. The second five-minute period would eliminate half of the remaining difference (another 25 percent). The third five-minute period would eliminate half of the remaining difference (12.5 percent); the fourth, 6.25 percent; the fifth, 3.125 percent; and so on. This exponential pattern means that the rate of change becomes progressively slower as the magnitude of the difference decreases. The example described a fast compartment; half-times for slow compartments have been computed in some algorithms out to almost 500 minutes. In decompression theory, the absolute difference in pressure is immaterial \u2014 the same half-time construct applies to any gradient. With no additional influences on the process, equilibration, or saturation, would be achieved in a period equal to about six half-times. As gas dissolves in the tissue, the difference between the external pressure and internal pressure decreases, reducing the driving force.<\/p>\n\n\n\n<p>Most dives do not last long enough for the diver to reach saturation \u2014 these are known as \u201cbounce dives.\u201d During such exposures, the inflow gradient exists throughout the descent and bottom phase of the dive, which causes continued uptake of inert gases, certainly in the body\u2019s slow compartments and probably in intermediate compartments. When the diver starts to ascend, and the ambient pressure starts to drop, the gradient begins to reverse \u2014 first in fast compartments and then in progressively slower compartments.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Degr\u00e9 de sursaturation<\/h3>\n\n\n\n<p>Effectively, during and after surfacing, most of a diver\u2019s tissues will be supersaturated in comparison with the ambient pressure. If the degree of supersaturation is modest, inert gases can travel in an orderly manner from the body\u2019s peripheral tissues into the blood and then to the lungs, from where they can be exhaled to the atmosphere. But if the degree of supersaturation is too great, the elimination of inert gases becomes disorderly. In this case, gas bubbles can form in the tissues of the diver\u2019s body.<\/p>\n\n\n\n<p>La formation de bulles ne pose pas toujours de probl\u00e8mes, mais plus le gradient ou le degr\u00e9 de sursaturation est \u00e9lev\u00e9, plus les signes et les sympt\u00f4mes de DCS risquent de se manifester.&nbsp;<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"400\" src=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-divers-000001484161-DAN-800x400-1.jpg\" alt=\"\" class=\"wp-image-11918\" srcset=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-divers-000001484161-DAN-800x400-1.jpg 800w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-divers-000001484161-DAN-800x400-1-360x180.jpg 360w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-divers-000001484161-DAN-800x400-1-768x384.jpg 768w, https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-divers-000001484161-DAN-800x400-1-18x9.jpg 18w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure><\/div>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>It is a dangerous misconception that measurable bubbles form after all dives and are of no importance. But at the same time, it is a misconception that bubbles visualized in the blood stream in and of themselves signal DCS. The formation of gas bubbles during decompression represents a stress greater than is optimal and may lead to DCS. It is best to follow conservative dive profiles to minimize the likelihood of bubble formation. The greatest difficulty is in knowing what counts as \u201cconservative,\u201d since most divers have never been monitored for bubbles, and uptake and elimination is altered by a number of factors in addition to the pressure-time profile.<\/p>\n\n\n\n<p>The half-time compartment calculations are used to generate exposure-limit predictions for a range of hypothetical compartments. In paper or plastic form these are known as \u201cdive tables.\u201d Modern dive computers allow for much more flexible guidance since they are able to continuously monitor the pressure-time profile and simultaneously compute the status of a variety of theoretical tissue compartments. But in reality, the picture is much more complex. Gas exchange is influenced by more than just the pressure-time profile. So while it is important for divers to understand the concepts behind calculating half-time compartments, divers must also keep in mind that a wide range of factors can influence gas uptake and elimination and effectively alter decompression risk. Thus the onus is on the diver not to rely too heavily on a table or device for safety.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"has-text-align-right\"><strong>Suivant : <a href=\"https:\/\/world.dan.org\/fr\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/use-of-dive-computers\/\">Chapter 2 \u2013 Effective Use of Your Dive Computer &gt;<\/a><\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>&#8220;One of the hazards associated with underwater diving is decompression sickness (DCS), caused by uncontrolled release of gas from tissues during or after surfacing.&#8221; Diving is a popular recreational pastime [&hellip;]<\/p>\n","protected":false},"featured_media":11927,"parent":1642,"menu_order":37,"template":"","dan_health_resource_types":[405],"class_list":["post-1648","dan_health_resources","type-dan_health_resources","status-publish","has-post-thumbnail","hentry","dan_health_resource_types-dive-medical-reference-books"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Chapter 1: Introduction to Decompression Sickness - DAN World<\/title>\n<meta name=\"description\" content=\"One of the hazards associated with the pressurized underwater setting is decompression sickness (DCS), a condition also known as &quot;the bends.&quot;\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/world.dan.org\/fr\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/\" \/>\n<meta property=\"og:locale\" content=\"fr_CA\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Introduction to Decompression Sickness\" \/>\n<meta property=\"og:description\" content=\"Diving is a popular recreational pastime as well as an activity with numerous practical applications in the scientific, commercial, military and exploration realms. While diving can be done safely, it is essential for all divers \u2014 no matter what their reason for diving \u2014 to appreciate that the underwater environment is unforgiving.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/world.dan.org\/fr\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/\" \/>\n<meta property=\"og:site_name\" content=\"DAN World\" \/>\n<meta property=\"article:modified_time\" content=\"2022-06-20T19:45:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-decompression-sickness-000015921161-DAN-1200x700-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"700\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Introduction to Decompression Sickness\" \/>\n<meta name=\"twitter:description\" content=\"Diving is a popular recreational pastime as well as an activity with numerous practical applications in the scientific, commercial, military and exploration realms. While diving can be done safely, it is essential for all divers \u2014 no matter what their reason for diving \u2014 to appreciate that the underwater environment is unforgiving.\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-decompression-sickness-000015921161-DAN-1200x700-1.jpg\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"8 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/world.dan.org\\\/health-medicine\\\/health-resource\\\/dive-medical-reference-books\\\/decompression-sickness\\\/introduction\\\/\",\"url\":\"https:\\\/\\\/world.dan.org\\\/health-medicine\\\/health-resource\\\/dive-medical-reference-books\\\/decompression-sickness\\\/introduction\\\/\",\"name\":\"Chapter 1: Introduction to Decompression Sickness - DAN World\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/world.dan.org\\\/es\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/world.dan.org\\\/health-medicine\\\/health-resource\\\/dive-medical-reference-books\\\/decompression-sickness\\\/introduction\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/world.dan.org\\\/health-medicine\\\/health-resource\\\/dive-medical-reference-books\\\/decompression-sickness\\\/introduction\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/world.dan.org\\\/wp-content\\\/uploads\\\/2020\\\/06\\\/DCS-decompression-sickness-000015921161-DAN-1200x700-1.jpg\",\"datePublished\":\"2020-06-19T20:14:22+00:00\",\"dateModified\":\"2022-06-20T19:45:03+00:00\",\"description\":\"One of the hazards associated with the pressurized underwater setting is decompression sickness (DCS), a condition also known as \\\"the bends.\\\"\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/world.dan.org\\\/health-medicine\\\/health-resource\\\/dive-medical-reference-books\\\/decompression-sickness\\\/introduction\\\/#breadcrumb\"},\"inLanguage\":\"fr-CA\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/world.dan.org\\\/health-medicine\\\/health-resource\\\/dive-medical-reference-books\\\/decompression-sickness\\\/introduction\\\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-CA\",\"@id\":\"https:\\\/\\\/world.dan.org\\\/health-medicine\\\/health-resource\\\/dive-medical-reference-books\\\/decompression-sickness\\\/introduction\\\/#primaryimage\",\"url\":\"https:\\\/\\\/world.dan.org\\\/wp-content\\\/uploads\\\/2020\\\/06\\\/DCS-decompression-sickness-000015921161-DAN-1200x700-1.jpg\",\"contentUrl\":\"https:\\\/\\\/world.dan.org\\\/wp-content\\\/uploads\\\/2020\\\/06\\\/DCS-decompression-sickness-000015921161-DAN-1200x700-1.jpg\",\"width\":1200,\"height\":700},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/world.dan.org\\\/health-medicine\\\/health-resource\\\/dive-medical-reference-books\\\/decompression-sickness\\\/introduction\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/world.dan.org\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Health Resources\",\"item\":\"https:\\\/\\\/world.dan.org\\\/es\\\/health-resources\\\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"Decompression Sickness\",\"item\":\"https:\\\/\\\/world.dan.org\\\/health-medicine\\\/health-resource\\\/dive-medical-reference-books\\\/decompression-sickness\\\/\"},{\"@type\":\"ListItem\",\"position\":4,\"name\":\"Chapter 1: Introduction to Decompression Sickness\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/world.dan.org\\\/es\\\/#website\",\"url\":\"https:\\\/\\\/world.dan.org\\\/es\\\/\",\"name\":\"DAN World\",\"description\":\"\",\"publisher\":{\"@id\":\"https:\\\/\\\/world.dan.org\\\/es\\\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/world.dan.org\\\/es\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-CA\"},{\"@type\":\"Organization\",\"@id\":\"https:\\\/\\\/world.dan.org\\\/es\\\/#organization\",\"name\":\"DAN World\",\"url\":\"https:\\\/\\\/world.dan.org\\\/es\\\/\",\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-CA\",\"@id\":\"https:\\\/\\\/world.dan.org\\\/es\\\/#\\\/schema\\\/logo\\\/image\\\/\",\"url\":\"https:\\\/\\\/world.dan.org\\\/wp-content\\\/uploads\\\/2022\\\/04\\\/DAN-World-logo-sm-52px.svg\",\"contentUrl\":\"https:\\\/\\\/world.dan.org\\\/wp-content\\\/uploads\\\/2022\\\/04\\\/DAN-World-logo-sm-52px.svg\",\"width\":175,\"height\":52,\"caption\":\"DAN World\"},\"image\":{\"@id\":\"https:\\\/\\\/world.dan.org\\\/es\\\/#\\\/schema\\\/logo\\\/image\\\/\"}}]}<\/script>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Chapter 1: Introduction to Decompression Sickness - DAN World","description":"One of the hazards associated with the pressurized underwater setting is decompression sickness (DCS), a condition also known as \"the bends.\"","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/world.dan.org\/fr\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/","og_locale":"fr_CA","og_type":"article","og_title":"Introduction to Decompression Sickness","og_description":"Diving is a popular recreational pastime as well as an activity with numerous practical applications in the scientific, commercial, military and exploration realms. While diving can be done safely, it is essential for all divers \u2014 no matter what their reason for diving \u2014 to appreciate that the underwater environment is unforgiving.","og_url":"https:\/\/world.dan.org\/fr\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/","og_site_name":"DAN World","article_modified_time":"2022-06-20T19:45:03+00:00","og_image":[{"width":1200,"height":700,"url":"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-decompression-sickness-000015921161-DAN-1200x700-1.jpg","type":"image\/jpeg"}],"twitter_card":"summary_large_image","twitter_title":"Introduction to Decompression Sickness","twitter_description":"Diving is a popular recreational pastime as well as an activity with numerous practical applications in the scientific, commercial, military and exploration realms. While diving can be done safely, it is essential for all divers \u2014 no matter what their reason for diving \u2014 to appreciate that the underwater environment is unforgiving.","twitter_image":"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-decompression-sickness-000015921161-DAN-1200x700-1.jpg","twitter_misc":{"Est. reading time":"8 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/world.dan.org\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/","url":"https:\/\/world.dan.org\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/","name":"Chapter 1: Introduction to Decompression Sickness - DAN World","isPartOf":{"@id":"https:\/\/world.dan.org\/es\/#website"},"primaryImageOfPage":{"@id":"https:\/\/world.dan.org\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/#primaryimage"},"image":{"@id":"https:\/\/world.dan.org\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/#primaryimage"},"thumbnailUrl":"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-decompression-sickness-000015921161-DAN-1200x700-1.jpg","datePublished":"2020-06-19T20:14:22+00:00","dateModified":"2022-06-20T19:45:03+00:00","description":"One of the hazards associated with the pressurized underwater setting is decompression sickness (DCS), a condition also known as \"the bends.\"","breadcrumb":{"@id":"https:\/\/world.dan.org\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/#breadcrumb"},"inLanguage":"fr-CA","potentialAction":[{"@type":"ReadAction","target":["https:\/\/world.dan.org\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/"]}]},{"@type":"ImageObject","inLanguage":"fr-CA","@id":"https:\/\/world.dan.org\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/#primaryimage","url":"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-decompression-sickness-000015921161-DAN-1200x700-1.jpg","contentUrl":"https:\/\/world.dan.org\/wp-content\/uploads\/2020\/06\/DCS-decompression-sickness-000015921161-DAN-1200x700-1.jpg","width":1200,"height":700},{"@type":"BreadcrumbList","@id":"https:\/\/world.dan.org\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/introduction\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/world.dan.org\/"},{"@type":"ListItem","position":2,"name":"Health Resources","item":"https:\/\/world.dan.org\/es\/health-resources\/"},{"@type":"ListItem","position":3,"name":"Decompression Sickness","item":"https:\/\/world.dan.org\/health-medicine\/health-resource\/dive-medical-reference-books\/decompression-sickness\/"},{"@type":"ListItem","position":4,"name":"Chapter 1: Introduction to Decompression Sickness"}]},{"@type":"WebSite","@id":"https:\/\/world.dan.org\/es\/#website","url":"https:\/\/world.dan.org\/es\/","name":"DAN World","description":"","publisher":{"@id":"https:\/\/world.dan.org\/es\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/world.dan.org\/es\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-CA"},{"@type":"Organization","@id":"https:\/\/world.dan.org\/es\/#organization","name":"DAN World","url":"https:\/\/world.dan.org\/es\/","logo":{"@type":"ImageObject","inLanguage":"fr-CA","@id":"https:\/\/world.dan.org\/es\/#\/schema\/logo\/image\/","url":"https:\/\/world.dan.org\/wp-content\/uploads\/2022\/04\/DAN-World-logo-sm-52px.svg","contentUrl":"https:\/\/world.dan.org\/wp-content\/uploads\/2022\/04\/DAN-World-logo-sm-52px.svg","width":175,"height":52,"caption":"DAN World"},"image":{"@id":"https:\/\/world.dan.org\/es\/#\/schema\/logo\/image\/"}}]}},"_links":{"self":[{"href":"https:\/\/world.dan.org\/fr\/wp-json\/wp\/v2\/dan_health_resources\/1648","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/world.dan.org\/fr\/wp-json\/wp\/v2\/dan_health_resources"}],"about":[{"href":"https:\/\/world.dan.org\/fr\/wp-json\/wp\/v2\/types\/dan_health_resources"}],"up":[{"embeddable":true,"href":"https:\/\/world.dan.org\/fr\/wp-json\/wp\/v2\/dan_health_resources\/1642"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/world.dan.org\/fr\/wp-json\/wp\/v2\/media\/11927"}],"wp:attachment":[{"href":"https:\/\/world.dan.org\/fr\/wp-json\/wp\/v2\/media?parent=1648"}],"wp:term":[{"taxonomy":"dan_health_resource_types","embeddable":true,"href":"https:\/\/world.dan.org\/fr\/wp-json\/wp\/v2\/dan_health_resource_types?post=1648"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}