{"id":1117,"date":"2026-04-24T10:00:00","date_gmt":"2026-04-24T10:00:00","guid":{"rendered":"https:\/\/medycyna-gorska.pl\/?p=1117"},"modified":"2026-04-17T17:07:16","modified_gmt":"2026-04-17T17:07:16","slug":"hypothermia-symptoms-swiss-staging","status":"publish","type":"post","link":"https:\/\/medycyna-gorska.pl\/en\/hypothermia-symptoms-swiss-staging\/","title":{"rendered":"Hypothermia Symptoms and Swiss Staging \u2014 a Climbers Guide"},"content":{"rendered":"\n<p><strong>Hypothermia<\/strong> is a drop in core body temperature below 35\u00b0C. In the mountains it develops insidiously \u2014 it starts with shivering and fatigue, and by the time it enters the moderate stage the victim stops cooperating and often does not realize they are in mortal danger. This article shows how to recognize the early signs, why the Swiss Staging classification is key to treatment decisions, and which field mistakes to avoid.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">In a nutshell \u2014 hypothermia stages and symptoms<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>HT I (35\u201332\u00b0C, mild)<\/strong> \u2014 shivering, agitation, tachycardia, blue lips<\/li>\n<li><strong>HT II (32\u201328\u00b0C, moderate)<\/strong> \u2014 shivering ceases, impaired consciousness, bradycardia<\/li>\n<li><strong>HT III (28\u201324\u00b0C, severe)<\/strong> \u2014 unconscious, basic life functions preserved<\/li>\n<li><strong>HT IV (&lt;24\u00b0C, extreme)<\/strong> \u2014 &#8220;apparent death&#8221;, cardiac arrest<\/li>\n<li><strong>Axillary or tympanic temperature measurement in the field is unreliable<\/strong> \u2014 clinical judgment rules<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Swiss Staging \u2014 why this classification<\/h2>\n\n\n\n<p>ICAR MEDCOM (International Commission for Alpine Rescue, Medical Commission) recommends the <strong>Swiss clinical staging<\/strong> instead of relying on temperature measurement alone. Practical reason: thermometers reaching core temperature (esophageal, rectal, bladder) are unavailable in the field, and axillary or tympanic measurements can differ from true core temperature by as much as 3\u20135\u00b0C.<\/p>\n\n\n\n<p>Swiss Staging is based on <strong>clinically observable features<\/strong>: presence or absence of shivering, level of consciousness, cardiovascular and respiratory function. It is a model built by alpine physicians for alpine physicians and rescuers \u2014 not for hospital intensive care.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">HT I \u2014 mild hypothermia (35\u201332\u00b0C)<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Clinical signs<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Intense shivering<\/strong> \u2014 body tries to generate heat via muscle tremor<\/li>\n<li>Elevated heart rate and respiratory rate<\/li>\n<li>Peripheral vasoconstriction \u2014 pale, cold hands and feet<\/li>\n<li>Blue lips, sometimes fingers<\/li>\n<li>Agitation and increased activity (body is &#8220;fighting&#8221;)<\/li>\n<li>Coordination impairment \u2014 difficulty zipping a jacket, opening a backpack<\/li>\n<li>Minimal or no cognitive impairment<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Field questions that help confirm diagnosis<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><em>&#8220;Get a match out of your pocket&#8221;<\/em> \u2014 fine finger motor control is significantly impaired already in HT I<\/li>\n<li><em>&#8220;What day is today? What&#8217;s your name? Where are we?&#8221;<\/em> \u2014 orientation preserved but answers slower<\/li>\n<li><em>&#8220;Walk along this line&#8221;<\/em> \u2014 motor coordination impaired<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">HT II \u2014 moderate hypothermia (32\u201328\u00b0C)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Shivering stops<\/strong> \u2014 this is a clinical watershed, a sign that the body can no longer compensate<\/li>\n<li>Psychomotor slowing, drowsiness, apathy<\/li>\n<li>Confusion, disorientation<\/li>\n<li><strong>Paradoxical undressing<\/strong> \u2014 victim feels a heat surge and removes clothing (peripheral vasoconstriction fails, blood rushes to skin)<\/li>\n<li>Muscle rigidity, gait disturbance<\/li>\n<li>Bradycardia, shallow breathing<\/li>\n<li>Disorientation to time and place<\/li>\n<\/ul>\n\n\n\n<p>Paradoxical undressing is a classic, dangerous sign \u2014 the victim removes a hat, unzips a jacket, in extreme cases trousers. A half-naked body found in snow can lead to a misread of assault at autopsy. Knowledge of this mechanism allows rescuers to correctly interpret the scene.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Why stopping shivering is so important<\/h3>\n\n\n\n<p>Shivering is the body&#8217;s largest natural &#8220;heat generator&#8221; \u2014 it can increase heat production by 500% over resting metabolism. When the victim stops trembling despite low ambient temperature, it means <strong>muscle glycogen has been depleted and compensatory mechanisms are failing<\/strong>. From this moment on the body slides into hypothermia without its own brake.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">HT III \u2014 severe hypothermia (28\u201324\u00b0C)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Unconscious<\/strong>, but basic life functions preserved<\/li>\n<li>Pulse slow and hard to feel \u2014 sometimes only at carotid<\/li>\n<li>Shallow, slow breathing (3\u20135\/min), may appear absent<\/li>\n<li>Pupils dilated, light response weakened or absent<\/li>\n<li>Muscle rigidity, no reflexes<\/li>\n<li>High risk of <strong>ventricular fibrillation<\/strong> from any stimulation<\/li>\n<\/ul>\n\n\n\n<p>At this stage every movement of the victim must be <strong>minimal and precise<\/strong> \u2014 sudden handling or chest compressions can trigger VF in the cold myocardium. If the patient is breathing with pulse \u2014 <strong>do not perform chest compressions<\/strong>. Exception: documented cardiac arrest.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">HT IV \u2014 extreme hypothermia (&lt;24\u00b0C)<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Cardiac arrest<\/strong> (VF or asystole) or &#8220;apparent death&#8221; state<\/li>\n<li>No response to stimuli<\/li>\n<li>No palpable pulse or breathing<\/li>\n<li>Pupils widely dilated, no light response<\/li>\n<li>Whole-body rigidity<\/li>\n<\/ul>\n\n\n\n<p>Cardinal rule of deep hypothermia: <strong>nobody is dead until warm and dead<\/strong>. Metabolism is so slowed that the brain can survive up to an hour without circulation. Literature describes full neurological recovery after CPR lasting &gt;6 hours \u2014 with ECMO rewarming in intensive care.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Common diagnostic mistakes<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Axillary temperature in HT II+<\/strong> \u2014 vasoconstriction distorts measurement; axillary reading can be several degrees higher than core<\/li>\n<li><strong>Trusting &#8220;I feel fine&#8221; in HT II<\/strong> \u2014 confusion masks self-assessment; patients routinely insist they are &#8220;just a bit cold&#8221;<\/li>\n<li><strong>Mistaking shivering for &#8220;emotional shaking&#8221;<\/strong> \u2014 in an avalanche victim post-extraction, shivering is often attributed to stress while HT I is already setting in<\/li>\n<li><strong>Underestimating exposure time<\/strong> \u2014 at 0\u00b0C with 5 m\/s wind, 30 min of sitting in wet clothing suffices to develop HT I<\/li>\n<li><strong>Assumption &#8220;if they can talk, they&#8217;re fine&#8221;<\/strong> \u2014 speech is preserved into HT III; a patient may still converse at core 28\u00b0C<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">When to call for help<\/h2>\n\n\n\n<p>Practical rule: <strong>any suspicion of HT II or deeper \u2014 call for help immediately<\/strong>, before starting medical interventions. Helicopter evacuation from HT III\/IV requires coordination with an ECMO-capable hospital (extracorporeal circulation). This information must reach the dispatcher <em>at the moment of the call<\/em>, not after the team arrives.<\/p>\n\n\n\n<p>Emergency numbers in Poland:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>112<\/strong> \u2014 European emergency number<\/li>\n<li><strong>TOPR: 601 100 300<\/strong> \u2014 Tatra mountains<\/li>\n<li><strong>GOPR: 985<\/strong> \u2014 other Polish mountain ranges<\/li>\n<\/ul>\n\n\n\n<p>More on step-by-step management \u2014 <a href=\"https:\/\/medycyna-gorska.pl\/en\/hypothermia-in-the-mountains\/\">Hypothermia in the mountains \u2014 full guide<\/a> and <a href=\"https:\/\/medycyna-gorska.pl\/en\/?p=1120\">Hypothermia wrap \u2014 building field insulation<\/a>.<\/p>\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-ht-obj-en-1\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">Why do hypothermic people undress themselves?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>This phenomenon is called paradoxical undressing and occurs in moderate hypothermia (HT II, 32\u201328\u00b0C). Severe thermoregulation disruption causes the brain to receive false overheating signals \u2014 the victim feels a heat surge and instinctively removes clothing. Neurologically: peripheral vasoconstriction fails, blood rushes to the skin, creating illusory warmth. It is a sign of advanced hypothermia requiring immediate evacuation.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-ht-obj-en-2\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">When does shivering stop and is that a good sign?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Shivering typically stops at core temperature 32\u00b0C (HT I \u2192 HT II transition). This is NOT a good sign \u2014 it indicates muscle glycogen depletion and compensatory failure. From that moment the body cannot produce its own heat and cannot recover spontaneously. Immediate insulation, escort to warmer location, and hospital evacuation are mandatory.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-ht-obj-en-3\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">Can axillary temperature assess hypothermia?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>In the field \u2014 no. Peripheral vasoconstriction in hypothermia distorts axillary and tympanic measurements by 1\u20135\u00b0C. Accurate core temperature requires esophageal, rectal, or bladder thermometers \u2014 hospital equipment. Mountain medicine practice uses Swiss Staging based on observable signs: shivering, consciousness, cardiorespiratory function.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-ht-obj-en-4\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">How fast does hypothermia develop?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>Depends on conditions. In wet clothing at 0\u00b0C with 5 m\/s wind, first HT I signs may appear in 30\u201360 min. In 5\u00b0C water (falling into a cold stream, river crossing), HT II may develop in 15\u201330 min. Extremely fast cooling occurs with avalanche burial \u2014 rate ~3\u00b0C\/h, HT II reached in about 60 min.<\/p>\n\n<\/div>\n<\/div>\n<div id=\"faq-q-ht-obj-en-5\" class=\"rank-math-list-item\">\n<h3 class=\"rank-math-question \">Can hypothermia be distinguished from hypoglycemia in the field?<\/h3>\n<div class=\"rank-math-answer \">\n\n<p>It can be tricky \u2014 both cause confusion, weakness, tremor, cold sweats. Key differences: hypoglycemia gives tachycardia, warm dry skin, responds to carbohydrates in 10\u201315 min. Hypothermia gives bradycardia in moderate stage, cool skin, no food response. If in doubt on expedition: give carbohydrates (banana, energy gel) \u2014 if hypoglycemia, symptoms resolve; if hypothermia, no harm done and you start thermal insulation regardless.<\/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>Brown DJ, Brugger H, Boyd J, Paal P. <em>Accidental hypothermia<\/em>. N Engl J Med. 2012;367(20):1930\u20131938.<\/li>\n<li>Paal P, Pasquier M, Darocha T, et al. <em>Accidental hypothermia: 2021 update<\/em>. Int J Environ Res Public Health. 2022;19(1):501.<\/li>\n<li>Auerbach PS, Cushing TA, Harris NS (eds). <em>Auerbach&#8217;s Wilderness Medicine<\/em>, 7th ed. Elsevier, 2016.<\/li>\n<li>ICAR MEDCOM guidelines \u2014 alpine-rescue.org.<\/li>\n<\/ul>\n\n\n\n<p><em><strong>Disclaimer:<\/strong> This article is for informational purposes only and does not replace individual medical consultation. In life-threatening situations call local mountain rescue (Poland: 112, TOPR 601 100 300, GOPR 985).<\/em><\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>Recognize hypothermia in the mountains: HT I\u2013IV stages of Swiss Staging, paradoxical undressing, when shivering stops, most common field diagnostic mistakes.<\/p>\n","protected":false},"author":2,"featured_media":1229,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-1117","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\/1117","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=1117"}],"version-history":[{"count":2,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/posts\/1117\/revisions"}],"predecessor-version":[{"id":1266,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/posts\/1117\/revisions\/1266"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/media\/1229"}],"wp:attachment":[{"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/media?parent=1117"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/categories?post=1117"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/medycyna-gorska.pl\/en\/wp-json\/wp\/v2\/tags?post=1117"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}