{"id":1135,"date":"2026-05-27T10:00:00","date_gmt":"2026-05-27T10:00:00","guid":{"rendered":"https:\/\/medycyna-gorska.pl\/?p=1135"},"modified":"2026-05-27T10:16:15","modified_gmt":"2026-05-27T10:16:15","slug":"avalanche-first-aid-icar-protocol","status":"publish","type":"post","link":"https:\/\/medycyna-gorska.pl\/en\/avalanche-first-aid-icar-protocol\/","title":{"rendered":"Avalanche First Aid \u2014 The Golden 15 Minutes &#038; ICAR Protocol"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><strong>Avalanche first aid<\/strong> is a race against the clock where every minute decides survival. Statistics are brutal: 15 minutes after burial the survival rate drops from 93% to 30%, and after 35 minutes most victims are dead \u2014 mainly from asphyxia, less often from mechanical trauma or hypothermia. This guide covers: what determines the &#8220;golden 15 minutes&#8221;, how to run triage in avalanche debris, why we still don&#8217;t stop resuscitation after 60 minutes, and what ICAR MEDCOM recommends in current guidelines.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">In a nutshell \u2014 key facts<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Survival curve<\/strong>: 93% @ 0\u201315 min, 30% @ 35 min, 15% @ 90 min, ~5% @ 120 min<\/li>\n<li><strong>Avalanche triad<\/strong>: asphyxia (75\u201380% of deaths), mechanical trauma (10\u201315%), hypothermia (5\u201310%)<\/li>\n<li><strong>&#8220;Golden 15 minutes&#8221;<\/strong>: time window during which asphyxia is not yet fatal<\/li>\n<li><strong>Cooling rate in snow<\/strong>: approximately 3\u00b0C\/h<\/li>\n<li><strong>Afterdrop after extraction<\/strong>: ventricular fibrillation risk from rough handling in HT II+<\/li>\n<li><strong>ICAR rule<\/strong>: <em>nobody is dead until warm and dead<\/em> \u2014 resuscitation to core 32\u00b0C in hospital<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">The avalanche burial survival curve<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Data from ICAR (International Commission for Alpine Rescue) registries over 40 years, covering thousands of avalanche burials in the Alps and North America. The curve has three distinct phases:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>0\u201315 min: &#8220;golden window&#8221;<\/strong> \u2014 93% still alive. Death in this period is almost always from severe mechanical trauma or massive crushing by the avalanche.<\/li>\n<li><strong>15\u201335 min: rapid decline<\/strong> \u2014 from 93% to 30%. Cause: oxygen depletion in the air pocket around the face. Those with an &#8220;air pocket&#8221; (3\u201330 cm\u00b3 free space) last longer; those without \u2014 asphyxia progresses fast.<\/li>\n<li><strong>35\u201390 min: low-survival plateau<\/strong> \u2014 30% \u2192 15%. Those who survive this period had significant air pockets and typically develop hypothermia as the second threat.<\/li>\n<li><strong>&gt;120 min: rare cases<\/strong> \u2014 usually tied to specific conditions (large air pocket, low temperature slowing metabolism, communication with snow cracks).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Practical implication: <strong>every minute of delayed rescue kills<\/strong>. In the first phase (0\u201315 min) correct action saves lives in 90%+ of cases. After 35 min \u2014 even the best action cannot reverse asphyxia that already occurred.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">The killing triad in avalanches<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">1. Asphyxia (75\u201380% of deaths)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Dominant cause of death. Mechanism: mass of snow (density 300\u2013500 kg\/m\u00b3) displaces air from alveoli, blocks airways, prevents chest expansion. In an air pocket (if one exists) the victim rebreathes the same air \u2014 CO\u2082 rises, O\u2082 falls. After 15 min inspired CO\u2082 can exceed 10%, causing hypoventilation up to apnea.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Mechanical trauma (10\u201315% of deaths)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">An avalanche strikes with force around 30\u201350 tons per m\u00b2 (for wet snow). Typical injuries: long bone fractures, cervical spine injury, pelvic fractures, visceral ruptures. In gully avalanches (confined rocky corridors) mechanical trauma risk is disproportionately high.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">3. Hypothermia (5\u201310% of deaths)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Cooling rate in snow: <strong>approximately 3\u00b0C\/h<\/strong>. After 30 min of burial the victim is usually still in HT I, 60\u201390 min HT II, 3 h HT III. Hypothermia becomes a leading cause of death only after prolonged burial (&gt;1 h) \u2014 but paradoxically protects the brain from hypoxia, enabling long resuscitation attempts after extraction.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ARVA \/ avalanche beacon \u2014 how it works and how to search<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">ARVA (Appareil de Recherche de Victime en Avalanche) is an electronic beacon working at <strong>457 kHz<\/strong> (international standard). Every climber entering avalanche terrain should carry one in transmit mode. If buried, witnesses switch their beacons to receive mode and search for the signal.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Three-phase search protocol<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Signal search<\/strong> \u2014 wide area, parallel lines 40 m apart, until first signal (usually &lt;30 s)<\/li>\n<li><strong>Coarse search<\/strong> \u2014 following the field line toward the strongest signal (arrows on display show direction)<\/li>\n<li><strong>Fine search<\/strong> \u2014 final 3\u20135 m, slow precise cross-pattern movement, minimum distance reading on display<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">After location: <strong>probing with an avalanche probe<\/strong> \u2014 systematic snow punctures in a spiral from the ARVA-marked point until the body is hit. Then <strong>digging<\/strong>: start 1\u20132 m downslope from the probe point to avoid collapsing structure over the face. Goal: expose airways within &lt;10 min.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Triage in avalanche debris \u2014 who to rescue first<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When multiple victims are buried and rescuers are few, the decision must be made in seconds. Priority:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Conscious victims with open airways<\/strong> \u2014 greatest chance of immediate survival, minimal time investment<\/li>\n<li><strong>Completely buried victims &lt;15 min ago<\/strong> \u2014 &#8220;golden window&#8221; ensures high survival<\/li>\n<li><strong>Partially buried with obstructed airways<\/strong> \u2014 airway can be quickly cleared; further management depends on status<\/li>\n<li><strong>Completely buried 15\u201335 min ago<\/strong> \u2014 declining survival, but still worth attempting<\/li>\n<li><strong>Victims buried &gt;35 min<\/strong> \u2014 continue rescue but not at cost of other buried victims<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Rule: <strong>maximum rescued, not most severely injured first<\/strong>. This is the inverse of civilian medical triage (where the most severely injured go first). In avalanche debris every minute spent resuscitating someone without survival chance is a minute taken from other buried victims.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Rescue collapse and afterdrop after extraction<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Rescue collapse<\/strong> is sudden cardiovascular collapse of a victim who survived burial but falls dead at extraction or shortly after. Two main mechanisms:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Afterdrop<\/strong> \u2014 cold peripheral blood rushes to the torso after vasodilation (e.g. on standing the victim upright), drops heart temperature another 1\u20132\u00b0C and triggers ventricular fibrillation<\/li>\n<li><strong>Crush syndrome<\/strong> \u2014 toxic muscle breakdown products (myoglobin, potassium) released after compression ends, flood systemic circulation and cause hyperkalemia, renal failure, arrhythmias<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Rescue collapse prevention: <strong>extract in horizontal position<\/strong> (never vertical), <strong>avoid rough handling<\/strong>, <strong>rewarm only centrally<\/strong> (chest, armpits, groin), <strong>monitor ECG<\/strong> from extraction if you have a defibrillator.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">ICAR\/MEDCOM resuscitation algorithm<\/h2>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Check airways<\/strong> \u2014 remove snow from mouth and nose; recovery position if breathing spontaneously<\/li>\n<li><strong>Assess breathing and pulse for 60 seconds<\/strong> \u2014 in hypothermia pulse may be 20\u201330\/min, easy to miss<\/li>\n<li><strong>If no breathing and pulse<\/strong> \u2014 CPR (100\u2013120 compressions\/min, 30:2 with rescue breaths). NOTE: in HT III\/IV continue despite &#8220;ineffectiveness&#8221; \u2014 the heart may only respond after warming<\/li>\n<li><strong>Apply hypothermia wrap<\/strong> \u2014 stop further heat loss (see <a href=\"https:\/\/medycyna-gorska.pl\/en\/hypothermia-wrap\/\">Hypothermia wrap \u2014 step by step<\/a>)<\/li>\n<li><strong>Transport to ECMO<\/strong> \u2014 in HT III\/IV with cardiac arrest target a hospital with extracorporeal circulation capability<\/li>\n<li><strong>Do not stop CPR before hospital<\/strong> \u2014 rule <em>nobody is dead until warm and dead<\/em>; continue to core temperature at least 32\u00b0C under hospital conditions<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Exception allowing field CPR termination: injuries incompatible with life (decapitation, torso rupture), victim buried &gt;60 min with documented obstructed airways from the start, core temperature &lt;10\u00b0C (measured by core thermometer, not axillary).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Crush syndrome in the field<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Develops when muscle compression lasts &gt;1 h. In tight avalanche pockets or under snow weighing hundreds of kilograms, muscles undergo ischemia and breakdown. After extraction \u2014 bloodstream receives: <strong>myoglobin<\/strong> (acute kidney injury risk), <strong>potassium<\/strong> (arrhythmias), <strong>phosphorus, creatinine, uric acid<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Field management<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>IV hydration (if accessible) \u2014 <strong>Ringer&#8217;s lactate 1\u20131.5 L\/h<\/strong> reduces renal failure risk<\/li>\n<li>Avoid potassium administration (check standard fluid labels)<\/li>\n<li>If calcium gluconate available (10% 10 mL IV) \u2014 stabilizes the heart during hyperkalemia<\/li>\n<li>Transport to a hospital with dialysis capability \u2014 rhabdomyolysis may require hemodialysis<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Trauma \u2014 ABCDE and MARCH<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Classic ABCDE (Airway, Breathing, Circulation, Disability, Exposure) is modified to <strong>MARCH<\/strong> in avalanche conditions:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>M<\/strong> \u2014 Massive haemorrhage \u2014 stop first<\/li>\n<li><strong>A<\/strong> \u2014 Airway<\/li>\n<li><strong>R<\/strong> \u2014 Respiration<\/li>\n<li><strong>C<\/strong> \u2014 Circulation<\/li>\n<li><strong>H<\/strong> \u2014 Hypothermia<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Key difference: MARCH prioritizes stopping massive hemorrhage before airway management (tactical pattern from combat medicine transferred to mountain rescue). In a fall-avalanche an arterial limb bleed kills in 3 minutes \u2014 faster than airway obstruction asphyxia.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Helicopter evacuation \u2014 victim preparation<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Secure landing zone<\/strong> \u2014 flat surface at least 20\u00d720 m, no loose items (backpacks, clothing in rotor wash)<\/li>\n<li><strong>Signal position<\/strong> \u2014 red flag or large letter &#8220;T&#8221; in snow with wind direction arrow<\/li>\n<li><strong>Stabilize victim<\/strong> \u2014 cervical spine immobilization if trauma, thermal wrap<\/li>\n<li><strong>Prepare documentation<\/strong> \u2014 ID, burial\/extraction time, observed symptoms, drugs given<\/li>\n<li><strong>Crew protection during helicopter approach<\/strong> \u2014 back turned, crouching; never approach rotor from above (uphill on avalanche slope)<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n<div id=\"rank-math-faq\" class=\"rank-math-block\">\n<div class=\"rank-math-list \">\n<div id=\"faq-q-lw-en-1\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">How many minutes does a buried avalanche victim have to survive?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>In the &#8216;golden 15 minutes&#8217; (0\u201315 min) survival is ~93%. Between 15 and 35 min it drops drastically to 30% due to progressive asphyxia. After 35 min only victims with preserved air pocket have realistic chance. The ICAR curve is the foundation of all rescue protocols \u2014 every minute before the 15-min threshold is literally worth a life.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-lw-en-2\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">Should resuscitation start after over an hour of burial?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Yes, following &#8216;nobody is dead until warm and dead&#8217; \u2014 in deep hypothermia metabolism is so slowed that the brain may survive an hour without circulation. Continue CPR to warming in hospital (&gt;32\u00b0C core temperature). Exceptions: decapitation, torso rupture, documented obstructed airways from burial start &gt;60 min. Full neurological recovery has been reported after &gt;6 h CPR with ECMO.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-lw-en-3\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">What is afterdrop in avalanche context?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Paradoxical drop in core temperature (heart, brain) after starting rewarming of the extracted victim. Occurs when cold peripheral blood rushes to the torso after vasodilation. Can trigger ventricular fibrillation and cardiac arrest. Prevention: horizontal-position extraction, minimize rough handling, rewarm only centrally (chest, armpits, groin, neck), avoid warmers on extremities.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-lw-en-4\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">How do avalanche beacons work and which to choose?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Beacons work at 457 kHz (international standard). Two modes: transmit (default, sending signal) and receive (searching). Modern 3-antenna models (Mammut Barryvox, Arva Neo, Ortovox Diract Voice) have 50\u201370 m range and multi-burial software. Budget option (BCA Tracker 4) suffices for recreation. Key: practice searching regularly \u2014 gear without practice won&#8217;t save you.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-lw-en-5\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">When to call helicopter vs evacuate yourselves?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Helicopter: burial &gt;15 min (intensive resuscitation needed), severe fall injuries, suspected HACE\/HAPE above 4000 m, suspected crush syndrome. Self-evacuation: victim walks, conscious, no HT II+ signs, &lt;30\u201345 min to lodge\/shelter. In Poland: TOPR 601 100 300, GOPR 985. In the Alps: 112 or 144 (Switzerland).<\/p>\n\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\">References<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Brugger H, Durrer B, Adler-Kastner L, et al. <em>Field management of avalanche victims<\/em>. Resuscitation. 2001;51(1):7\u201315.<\/li>\n<li>Van Tilburg C, Grissom CK, Zafren K, et al. <em>Wilderness Medical Society Clinical Practice Guidelines for the Out-of-Hospital Evaluation and Treatment of Avalanche Victims: 2017 Update<\/em>. Wilderness Environ Med. 2017;28(1):23\u201342.<\/li>\n<li>Strapazzon G, Paal P, Schweizer J, et al. <em>Effects of snow properties on humans breathing into an artificial air pocket<\/em>. Crit Care Med. 2019;47(3):e214\u2013e219.<\/li>\n<li>ICAR MEDCOM avalanche resuscitation guidelines \u2014 alpine-rescue.org.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\"><em><strong>Disclaimer:<\/strong> This article is informational and does not replace certified avalanche training (IKAR-CISA, AIARE). In life-threatening emergencies: 112 in Europe, local mountain rescue in your region.<\/em><\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>Avalanche burial survival curve, triage, rewarming, crush syndrome, helicopter evacuation. Wilderness medicine by expedition doctor.<\/p>\n","protected":false},"author":2,"featured_media":1247,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-1135","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aktualnosci"],"_links":{"self":[{"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/posts\/1135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/comments?post=1135"}],"version-history":[{"count":2,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/posts\/1135\/revisions"}],"predecessor-version":[{"id":1281,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/posts\/1135\/revisions\/1281"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/media\/1247"}],"wp:attachment":[{"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/media?parent=1135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/categories?post=1135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/tags?post=1135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}