{"id":11245,"date":"2025-11-05T01:19:50","date_gmt":"2025-11-05T01:19:50","guid":{"rendered":"https:\/\/daivings.lv\/?p=11245"},"modified":"2025-11-05T01:38:44","modified_gmt":"2025-11-05T01:38:44","slug":"skabekla-toksicitates-parvaldiba-ar-jj-ccr-ieskats-cns-un-otu-tabulas","status":"publish","type":"post","link":"https:\/\/daivings.lv\/en\/oxygen-toxicity-management-with-jj-ccr-insight-cns-and-brush-tables\/","title":{"rendered":"Oxygen toxicity management with JJ-CCR, insight into CNS and OTU tables"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><strong><a href=\"https:\/\/daivings.lv\/tag\/jj-ccr\/\">JJ-CCR<\/a><\/strong> (Closed-Circuit Rebreather) is an advanced technical diving tool that, by maintaining an optimal partial pressure of oxygen PO2, significantly extends dive time and improves decompression efficiency. However, these benefits require understanding and tight control over the silent but potentially lethal enemy \u2013 <strong>oxygen toxicity<\/strong>. CCR divers often maintain high <strong>PO2<\/strong> (typically $1.2-1.4 \\text{ ATA}$), so toxicity risk management is more critical than in open system diving.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Contents\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/daivings.lv\/en\/oxygen-toxicity-management-with-jj-ccr-insight-cns-and-brush-tables\/#I_Centralas_Nervu_Sistemas_CNS_Skabekla_Toksicitate\" >I. Central Nervous System (CNS) Oxygen Toxicity<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/daivings.lv\/en\/oxygen-toxicity-management-with-jj-ccr-insight-cns-and-brush-tables\/#II_Pulmonara_Skabekla_Toksicitate\" >II. Pulmonary Oxygen Toxicity<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/daivings.lv\/en\/oxygen-toxicity-management-with-jj-ccr-insight-cns-and-brush-tables\/#III_Jaunakie_Petijumi_un_Kontrolejosie_Faktori\" >III. Recent Research and Controlling Factors<\/a><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"I_Centralas_Nervu_Sistemas_CNS_Skabekla_Toksicitate\"><\/span>I. Central Nervous System (CNS) Oxygen Toxicity<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">CNS toxicity, also known as <strong>Paul Beer effect<\/strong> (Paul Bert Effect), is <strong>acute<\/strong> a neurological response caused by too high a PO2. It usually occurs suddenly and is the main limitation on maximum depth and PO2 levels.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms (VENTID-C mnemonic):<\/strong> They start with mild disturbances: Vision, Ears (e.g. ringing), Nausea, Muscle twitching (Twitching, especially of the lips and face), Irritability, Dizziness and end with <strong>seizure<\/strong> (Convulsion). A seizure underwater is usually fatal.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>CNS Table and Clock<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">To manage this risk, it is used <strong>CNS Clock<\/strong> or CNS (percentage of oxygen exposure). It measures <strong>cumulative<\/strong> oxygen exposure by comparing the time spent at a given PO2 level with the maximum allowable time for that pressure (e.g., in NOAA tables).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Management Limit:<\/strong> The conservatively recommended maximum CNS is <strong>80% per dive<\/strong> and <strong>100% in a 24-hour period<\/strong>.<\/li>\n\n\n\n<li><strong>Time Limits (examples):<\/strong>\n<ul class=\"wp-block-list\">\n<li>$1.6 \\text{ ATA} \\rightarrow 45 \\text{ minutes}$ (maximum allowed $\\text{PO}_2$ rebreather emergency).<\/li>\n\n\n\n<li>$1.4 \\text{ ATA} \\rightarrow 150 \\text{ minutes}$ (commonly used deco setpoint).<\/li>\n\n\n\n<li>$1.3 \\text{ ATA} \\rightarrow 180 \\text{ minutes}$.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>JJ-CCR Context:<\/strong> In a CCR system, $\\text{PO}_2$ is constantly maintained at a high level, so the diver must accurately monitor the time and calculate $\\text{CNS \\%}$ at each setpoint.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"II_Pulmonara_Skabekla_Toksicitate\"><\/span>II. Pulmonary Oxygen Toxicity<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Pulmonary toxicity, or <strong>The Lauren Smith effect<\/strong> (Lorrain Smith Effect), is <strong>chronic<\/strong> a problem that occurs when exposed to elevated $\\text{PO}_2$ environments for long periods of time. This is a major limitation for very long and repetitive dives.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Symptoms:<\/strong> It affects the respiratory system, causing damage to lung tissue. Symptoms include: <strong>dry, irritating cough<\/strong>, pain in the chest area (substernal pain) and shortness of breath.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>OTU (Oxygen Toxicity Units):<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The risk of pulmonary toxicity is measured by <strong>Oxygen Toxicity Units (OTU)<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Definition:<\/strong> <strong>One OTU<\/strong> is obtained by breathing $\\mathbf{100\\%}$ oxygen ($1.0 \\text{ ATA} \\text{ PO}_2$) <strong>one minute<\/strong>.<\/li>\n\n\n\n<li><strong>Cumulative Impact:<\/strong> OTU is calculated using factors that adjust the time at a given $\\text{PO}_2$ according to the baseline $1.0 \\text{ ATA}$.<\/li>\n\n\n\n<li><strong>Daily Limit:<\/strong> Usually recommended <strong>conservative limit<\/strong> is $\\mathbf{300 \\text{ OTU}}$ in 24 hours (especially important on long, repeated diving expeditions).<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"III_Jaunakie_Petijumi_un_Kontrolejosie_Faktori\"><\/span>III. Recent Research and Controlling Factors<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Research involving prolonged technical diving (typical of JJ-CCR use) continues to optimize toxicity management.<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><strong>$\\text{PO}_2$ Extended Limits:<\/strong> Newer guidelines (especially for $1.3 \\text{ ATA}$) allow longer exposures in some cases than those specified in the old 24h tables (e.g. up to $240 \\text{ min}$ in the working phase and an additional $240 \\text{ min}$ in the decompression phase). However, this issue is still under discussion.<\/li>\n\n\n\n<li><strong>$\\text{CO}_2$ As a Major Co-factor:<\/strong> The most significant recent discovery for CCR divers is that <strong>increase in carbon dioxide ($\\text{CO}_2$) levels<\/strong> in breathing gas <strong>dramatically lowers the threshold<\/strong> For the onset of CNS toxicity.\n<ul class=\"wp-block-list\">\n<li><strong>Practical Importance of JJ-CCR:<\/strong> A poorly functioning soda lime (scrubber), excessive ventilation, or cold can cause a buildup of $\\text{CO}_2$. In this case, a seizure can occur even at a \u201csafe\u201d level of $\\text{PO}_2$. This highlights <strong>scrubber maintenance<\/strong> and <strong>calm breathing techniques<\/strong> importance.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Summary:<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When diving with <strong>JJ-CCR<\/strong>, toxicity management is two-fold: rigorous monitoring <strong>CNS %<\/strong> with the help of PO2 sensors to avoid acute neurological danger, and should be followed <strong>OTU<\/strong> level in the long term to protect your lungs. Always remember that <strong>CO2 control<\/strong> is as important as O2 control.<\/p>","protected":false},"excerpt":{"rendered":"<p>The JJ-CCR (Closed-Circuit Rebreather) is an advanced technical diving tool that, by maintaining an optimal partial pressure of oxygen PO2, significantly extends dive time and improves decompression efficiency. However, these benefits require understanding and tight control over the silent but potentially lethal enemy \u2013 oxygen toxicity. [\u2026]<\/p>","protected":false},"author":1,"featured_media":11233,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1600],"tags":[],"class_list":["post-11245","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tehniska-nirsana"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sk\u0101bek\u013ca toksicit\u0101tes p\u0101rvald\u012bba ar JJ-CCR, ieskats CNS un OTU tabul\u0101s - Daivings.lv<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/daivings.lv\/en\/oxygen-toxicity-management-with-jj-ccr-insight-cns-and-brush-tables\/\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sk\u0101bek\u013ca toksicit\u0101tes p\u0101rvald\u012bba ar JJ-CCR, ieskats CNS un OTU tabul\u0101s - Daivings.lv\" \/>\n<meta property=\"og:description\" content=\"JJ-CCR (Closed-Circuit Rebreather) ir advanc\u0113ts tehnisk\u0101s nir\u0161anas r\u012bks, kas, uzturot optim\u0101lu sk\u0101bek\u013ca parci\u0101lo spiedienu PO2, iev\u0113rojami pagarina nir\u0161anas laiku un uzlabo dekompresijas efektivit\u0101ti. 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