Hypothermia inyuma y'ugutonyanga, gufata neza, no guhagarara kw'umutima¶

Ubushuhe bukomeye buterwa n’impanuka ni kimwe mu bibazo vyihutirwa vy’ubuvuzi biteye akaga cane mu kurondera no gutabara, mu buvuzi bwo mu bugaragwa no mu biza vy’ibisagara mu rushana. Iyo ubushuhe bwo mu mubiri bushitse munsi ya 35 °C (95 °F), umubiri w’umuntu uragira ububabare bugenda burasenyuka. Igitigiri c’ibifungurwa mu mubiri kiragabanuka cane, umutima uragabanuka, uguhema kuragabanuka, kandi umutsi wo hagati urahagarara buhorobuhoro.

Ariko rero, akaga gashobora kwica cane mu gucungera ubushuhe bwinshi akenshi kaba mu gihe co gutabara no gusubira gushusha. Abarokozi batera, bazunguza canke batera umurwayi afise ubushuhe bukomeye cane, barashobora gutuma umutima ugira ububabare bw’umutima buca butera, bigatuma umutima ushavuye kandi ukanye, ugahagarara. kandi, ugushuha hanze kudakwiriye kw’amaguru n’amaboko bikonje birashobora gutuma umuntu agira afterdrop, aho amaraso ahagaze, akanye, afise aside ava mu bihimba vy’umubiri asubira mu mutima, bigatuma umutima ukonjera mbere kuruta kandi bigatuma umutima n’imitsi bihungabana. Gutahura ingene umubiri ukora inyuma y’ugutera umuti, ivy’uko bikenewe cane ko umuntu afata neza umurwayi, uburyo bwo gutera umuti mu Busuwisi, be n’itandukaniro riri hagati y’ugusubira gushushanya umutima udakora n’uwukora, birashobora gusobanura itandukaniro hagati y’ubuzima n’urupfu.

Ivyo ubikore ubu¶

1. Fata umurwayi afise ubushuhe burengeje urugero, n’ubugwaneza burengeje urugero, nk’ubw’ugubaga. Gugabanya inyigisho zose z’umubiri; ntukigere wemera ko umurwayi agenda, ahagarara, kwicara ningoga canke ngo akore utwigoro twose two ku mubiri.
2. Kwirinda gutakaza ubushuhe bundi mu gukura umurwayi mu bidukikije bikanye. Gukingira umuntu umuyaga, ubukonje, n’ubukonje bwo hasi mu gukora igipfukisho c’umuriro gikingira umwotsi ukoresheje amatara, imifuko yo kuryamako, n’ibitambaro vy’impuzu.
3. Guma umurwayi ahagaze neza. Murambike umuntu ahagaze neza kugira ngo amaraso ntaje mu bwonko mu buryo butunguranye, no kugira ngo umutima ugabanye umubabaro ku mutima ukaze kandi ushavura.
4. Ntukigere usiga, ukaraba, canke ngo ushire ubushuhe butaziguye ku maboko canke ku maguru. Gushusha canke gusiga amaguru n’amaboko bituma imitsi ihita igwira, amaraso akagira ubukonje, amaraso agira asidi agororotse mu mutima kandi bigatuma umuntu apfa.
5. Suzuma umutsi w’umutima n’uguhema mu masegonda 60 yuzuye. Uguhindura ibiribwa mu gihe umuntu afise ubushuhe bwinshi bigabanya ibimenyetso vy’umubiri ku rugero rudashobora kugaragara; gufata umunota wose imbere y’uko ushika ku ciyumviro c’uko umurwayi ari mu mutima.
6. Tangira CPR idahagarara nimba vy’ukuri umurwayi ata n’umutima afise maze uhamagare abajejwe ivy’ubuvuzi vyihutirwa. Nimba ata n’umutima ubonetse inyuma y’amasegonda 60, tangura gutera umutima mu gikiriza ubwo nyene maze ukomeze udahagaze mu gihe co kumutwara mu bitaro bifise ubuhinga bwo gusubira gushushanya umubiri.

Ivyerekeye umubiri w'umuntu wo gukonjesha: uburyo bwo gutegura ibintu mu Busuwisi¶

Ubushuhe burengeye ubushuhe buterwa n’impanuka busobanurwa nk’ugutemba kw’ubushuhe bwo mu mubiri ata co buvuze, bukaja munsi ya 35 °C (95 °F). Kubera ko gupima neza ubushuhe bwo mu mutima mu bidukikije vy’imbere y’uko umuntu aja mu bitaro bisaba ko umuntu akoresha igikoresho co gupima ubushuhe bwo mu muhogo canke mu muhogo, abaganga bizigira ubuhinga bwasubiwemwo bwo gupima ubushuhe bwo mu mubiri buva ku mpanuka. Iyi nzira yateguwe na Komisiyo Mpuzamakungu y’Ubuvuzi bw’Ivyihutirwa bwo mu Misozi (ICAR MEDCOM), ihuza ibimenyetso vy’ubuvuzi bishobora kubonwa n’imirongo y’ubushuhe bw’ishimikiro kandi igategeka ingene umuntu yovyifatamwo.

flowchart TD
    A["Umurwayi yashikiwe n'imbeho yaramenyekanye"] --> B{"Mbega umurwayi yoba ari maso, ari maso kandi ahinda umushyitsi mu buryo busanzwe?"}
    B -- Yes (Stage I: 32 °C to 35 °C) --> C["Gusubira gushushanya hanze: Imyambaro yumye, ibinyobwa bishushe bisosa"]
    B -- No --> D{"Mbega umurwayi arazi ariko arazazanirwa / ntajugumira?"}
    D -- Yes (Stage II: 28 °C to 32 °C) --> E["Gufata neza cane; Impande zose; Ubushuhe bw'inyuma bukora"]
    D -- No --> F{"Mbega umurwayi arabura ubwenge ariko ahumeka n’umutima?"}
    F -- Yes (Stage III: 24 °C to 28 °C) --> G["Gutuma umuntu adakora; Inzitizi y’Umwotsi; Gukura abantu mu bitaro vyihuse"]
    F -- No (Stage IV: Below 24 °C) --> H{"Suzuma Impumuro / Guhema mu Masegonda 60 Yuzuye"}
    H -- No Signs --> I["CPR ikomeza + Kwimurirwa vyihuse ku ECMO / CPB"]

Intambwe ya mbere: Ubushuhe buke (35 °C gushika kuri 32 °C / 95 °F gushika kuri 90 °F)¶

Kuri iyi ntambwe, uburinzi bw’umubiri buguma bukora neza:

Umurwayi arazirikana, ari maso kandi arashobora kuvugana n’abandi mu buryo busanzwe, naho nyene yoshobora gusa n’uwutagira ico yitwararika, akagira ubunebwe canke akavuga ata co avuga.

Ivyuka vy’ubushuhe vy’uguhinda umushyitsi vyinshi birahari. Guhungabana kw’imitsi ata co bimaze birashobora kwongera ubushuhe buva mu mubiri n’ibice 400 gushika ku bice 500 kw’ijana hejuru y’ivyo mu ntango.

ibimenyetso bihambaye vyerekana umubabaro uterwa n’imbeho: tachycardie (umutima utera vuba), tachypnea (uguhema vyihuta), n’umuvuduko w’amaraso uri hejuru.

Diurese y’ubukonje irabaho. Ugucika intege kw’imitsi y’inyuma (peripheral vasoconstriction) bituma amaraso yo hagati yongerekana, bigatuma amafyigo acungera amazi menshi y’amasobe, ivyo bikaba bituma umuntu agira hypovolémie systémique n’ukubura amazi mu mubiri.

Abarwayi bari mu rwego rwa mbere barashobora kwironsa ubushuhe kandi bazokira biciye mu gusubira gushuha hanze iyo bahawe ubushuhe bwumye n’ingaburo zifise amakalori menshi.

Intambwe ya II: Ubushuhe buringaniye (32 °C gushika kuri 28 °C / 90 °F gushika kuri 82 °F)¶

Mu gihe c’ubushuhe buringaniye, uburyo bwo gucungera ubushuhe bw’umubiri buratangura kunanirwa:

Guhinda umushyitsi birahagarara burundu. Iyo ubushuhe buri munsi ya 32 °C (90 °F), ububiko bwa glycogène mu mitsi y’amagufa buraruha, maze igihimba c’umubiri citwa hypothalamus kigatakaza ubushobozi bwo guhuza ubushuhe butera ubwoba. Umurwayi ata guhungabana, ntashobora kuzosubira gutuma haba ubushuhe bwo mu mutima.

Ivy’ubwenge biragenda birahungabana ningoga. Umurwayi aca agira urujijo cane, ntabe afise ubushobozi bwo gukora (ivyo bita "umbles": akavyuka, akavyuka, akatsitara), akarwana canke akagira ubujuju.

Gukurako imyambaro biteye ubwoba birashobora kubaho. Ugukura kw’imitsi y’umubiri (hypothalamus) bituma imitsi y’inyuma y’umubiri ihinduka bukwi na bukwi kandi idakwiriye, ivyo bikaba bituma umurwayi akonje yumva ubushuhe bukomeye bushasha, ivyo bikaba bituma akuraho impuzu imbere gato y’uko asenyuka.

ibimenyetso bihambaye biragabanya: bradycardie (umutima utera buhoro), hypoventilation (uguhema buhoro, ataco bimaze), n’ugutera imbere kw’umutima.

Igihimba c’umutima kirashavura kandi kigashobora gushikirwa n’indwara y’umutima. Abarwayi bari mu rwego rwa II basaba gufatwa neza no gushushanya umubiri hanze.

Intambwe ya III: Ubushuhe bukomeye (28 °C gushika kuri 24 °C / 82 °F gushika kuri 75 °F)¶

Hypothermie ikaze igereranya uguhagarara kw’imitsi y’umubiri gushika ku rupfu rusa n’urwo:

Umurwayi arabura ubwenge rwose kandi ntashobora kwishura ku majambo canke ku bintu bimubabaza.

Ivyiyumviro birazimangana; amaso y’abanyeshure yoshobora kwaguka kandi ntaco akora rwose iyo abonye umuco, ivyo bikaba vyigana urupfu rw’ubwonko rwo mu bitaro.

Ivyo umutima usohora bigabanuka bikaja munsi y’ibice 30 kw’ijana vy’ivyo umutima usohora. Impumuro y’umutima iragoyagoya, iratera nk’indodo, kandi iragenda buhoro cane (kenshi itera 10 gushika ku 20 ku munota).

Guhema bivanye n’ivyo umuntu akora biragenda buhoro gushika aho ahumeka incuro 2 canke 4 ku munota, akenshi umuntu akaruhuka igihe kirekire, akamara amasegonda 15 canke 30 hagati y’uguhema.

Imitsi irakomera, igaragara nk’ugukomantara guterwa n’ubukonje bishobora kwihenda bitagoranye ko ari rigor mortis y’inyuma y’urupfu.

Umutima uri mu gihe c’umuyagankuba gishobora gusenyuka cane. Mbere n’ugukomeretswa gutoyi kw’imitsi birashobora gutuma umutima uhagarara ubwo nyene. Abarwayi bo mu rwego rwa III basaba kwihutirwa kwirukanwa mu kigo c’ubuvuzi co mu rwego rwa gatatu gifise ibikoresho vyo gusubira gushuha imbere mu mubiri.

Intambwe ya IV: Ubushuhe bukomeye / urupfu rusa n’urwo (munsi ya 24 °C / 75 °F)¶

Mu ntambwe ya IV, ibimenyetso vy’ubuzima ntibiboneka canke ntibiboneka:

Umurwayi asa n’uwapfuye: nta n’umutima afise, afise ububabare bwo mu mutwe, akanye nk’ibuye, afise amaso yagutse ahagaze kandi imitsi ikaba ikomeye cane.

Ibikorwa vy’umuyagankuba mu mutima bishobora kuba birimwo ugutera kw’imitsi y’umutima canke ugutera kw’umuyagankuba kugaragara ku bipimo vy’umuyagankuba bimenyerewe.

Ariko rero, ivyipfuzo vy’ingingo ngenderwako mu gihe umuntu afise ubushuhe bwinshi cane biragabanuka bikaja munsi y’ibice 10 kw’ijana vy’ivyo umuntu akeneye. Ku bushuhe bwo mu mutima buri hasi cane, ubwonko n’umutima birashobora kurokoka igihe kirekire umutima uhagaze ata nkovu ihoraho y’umutima.

Abarwayi basa n’abapfuye muri ivyo bihe barashobora gukira mu buryo bushitse iyo ugusubiza ubuzima mu mutima n’amahaha gukomeza gushika aho gusubira gushuha imbere mu mubiri bishitse biciye ku gufasha ubuzima hanze y’umubiri (ECLS).

Inyuma y'amazi: biophysique n'ugusenyuka kw'imitsi¶

Igitera inyuma y’ugutonyanga ni ugukomeza kugabanya ubushuhe bw’umubiri w’imbere inyuma y’aho umurwayi amaze gukizwa ubukonje, canke mu bice vya mbere vy’ugusubira gushuha hanze.

Naho umurwayi ashirwa mu modoka itwara abarwayi ishushe canke azingiwe mu bitambaro bishushe, ubushuhe bw’ibihimba vy’umubiri (ubwonko, umutima, amahaha) burashobora kubandanya bugabanuka n’ibipimo vya 2 °C gushika kuri 5 °C (3,6 °F gushika kuri 9 °F) mu minota 30 gushika kuri 60 ikurikira. Ku murwayi ubushuhe bwiwe bwo mu mutima busanzwe buri ku rugero rw’akaga rwa 28 °C (82 °F), iyo umuntu agwiriye mu ntambwe 3, umutima uhagarara cane.

Thermal Conductive Inward Wave
      |
Cooling Continues in Core Organs (Brain, Heart)

      | Stagnant, acidotic venous blood surges inward
Vasodilation in Extremities (Rewarming limbs first)

      | Freezes coronary pacemaker nodes (SA/AV)
Ventricular Fibrillation / Asystolic Cardiac Arrest

Uburyo bwo gutwara inyuma y'amazi: gutwara n'ugutembera¶

Afterdrop irongowe n’uburyo bubiri butandukanye bw’umubiri:

Ubushuhe bujana ubushuhe buringaniye bukora biciye mu gutanga ubushuhe butagira agasembwa. Iyo umuntu akanye cane, habaho ubushuhe bwo mu mutima: ingingo nyamukuru zirakonja, mugabo imitsi y’imbere n’imitsi yo munsi y’urukoba y’igikoko co hanze birakonja kuruta. Iyo ubushuhe buva ku ruhande rw’urukoba buhagaze, ubushuhe burabandanya bujana ubushuhe buva mu mutima ushushe buja hanze mu gipfukisho gikonje gushika ubushuhe bushitse ku rugero rwo hejuru mu mubiri wose.

Ihinduka ry’umuyagankuba ry’amaraso ni uburyo buteye akaga kuruta ubundi bwose. Mu gihe umuntu ariko arashikirwa n’ubukonje bukomeye, ugucika intege kw’imitsi yo mu mpera y’umubiri kuratandukanya amaraso ari mu mutima, bigatuma imitwe y’umubiri ikonja, igacika intege, kandi igahagarara.

Iyo abarokozi bakoze ikosa rikomeye ryo gushushanya n’umwete amaboko n’amaguru y’umurwayi, canke iyo umurwayi yemerewe kugenda, imitsi y’amaraso iri ku ruhande iragwira ningoga:

Amaraso asusurutse yo mu mitsi yiruka hanze aja mu bihimba vy’umubiri bikanye.

Aho, amaraso arakonja gushika ku bushuhe buri hafi y’aho umuntu ari, maze agatoragura ibintu vyinshi vy’umwanda vyirundanijwe mu mitsi y’amagufa y’umubiri: aside lactic, iyoni z’iyidorojeni, iyoni za karbone be n’iyoni za potasiyumu zivuye mu ngingo z’imitsi yononekaye.

Ayo maraso akanye, afise aside nyinshi, afise hyperkalemie, asubira gupompa biciye mu mitsi yo hasi n’iyo hejuru, akaja mu gice c’iburyo c’umutima.

Ugushika bukwi na bukwi kw’uwo mwuzure w’imitsi y’urubura gutuma umutima ugira ubukonje bwinshi mu masegonda makeyi, ugatangaza utugingo ngengabuzima tw’umutima n’utw’umutima (atrioventriculaire) kandi ugatuma umutima udatera neza.

Ico gihe nyene, ukwaguka bukwi na bukwi kw’igiti c’imitsi yo mu mpande bituma umuntu agira ubumuga bukomeye bwo mu maraso, buzwi kw’izina rya rewarming shock, bugatuma umuvuduko w’amaraso mu mitsi ugabanuka ukagera kuri zero.

Ugutera kw'imitsi y'umutima n'umutima w'umutima¶

Mu bikorwa bisanzwe vy’ubuvuzi, kwinyiganza, kwizingira canke gutwara ibintu biragira ingaruka nke cane ku nzira y’umutima. Ariko rero, iyo umuntu afise ubushuhe bukomeye cane, imiterere y’ibinyabuzima y’imitsi y’umutima irahinduka cane.

Umutima ugira ubushuhe bwinshi ni urugingo rudashikamye kubera umuyagankuba, rutera umunezero mwinshi cane.

Impinduka zijanye n'umuyagankuba mu mutima ukanye¶

Uko ubushuhe bwo mu mutima bugenda bugabanuka bukaja munsi ya 30 °C (86 °F), ni ko utugingo ngengabuzima dutandukanye dutera imbere mu bijanye n’imitsi y’umutima:

Ivyiyumviro vy’ugukuraho n’ugusubira gukora kw’ubushobozi bw’umutima biramara igihe kirekire cane kubera ko amapompo y’iyon akoreshwa n’intungamubiri (nk’ipompa ya sodium-potassium ATPase) agenda buhoro.

Umuvuduko wo gutwara umuyagankuba biciye mu mugwi w’insinga za His na Purkinje uragabanuka, bikaba bituma habaho itandukaniro rikomeye mu karere mu bijanye n’uguhagarika umuyagankuba mu mutsi w’umutima.

Igishushanyo c’umutima (ECG) kigaragaza ibimenyetso vya kera vy’ugushavura: ugutera imbere kw’umutima, ugukura kw’igihe ca PR, ukwaguka kwa QRS, ugukura kw’igihe ca QT, n’ukugaragara kw’imipfunda ya Osborn (imipfunda ya J), uguhinduka kw’imipfunda myiza gukomeye kuba hagati y’igice ca QRS n’igice ca QST gihurirana.

Kubera ko ibice bitandukanye vy’uruhome rw’umutima bisubira gutera imbere ku rugero rutari rwo, umutima uragira ingorane zidasanzwe z’ikintu citwa R-on-T. Uguhungabana gutoyi kw’ubuhinga canke uguhinduka kw’ibihimba vy’umubiri mu buryo butunguranye birashobora gutuma umubiri ugenda udatunganye kandi ugira akajagari, ugaca utangura kunyiganyiga kw’imitsi y’umutima.

Electrocardiographic Features of Severe Hypothermia:
-----------------------------------------------------------
1. Severe sinus bradycardia (15 to 30 beats per minute).
2. Osborne wave (J-wave) at the QRS-ST junction.
3. Prolonged PR, QRS, and QTc intervals.
4. Atrial fibrillation with slow ventricular response.
5. High susceptibility to sudden Ventricular Fibrillation (VF).

Kubera iki gufata neza ari itegeko rikomeye ry'ubuvuzi¶

Kubera ko myocarde ishobora gukora cane, ukwinyiganza kw’umubiri kurashobora gukora nk’ikintu co hanze gitera umutima gutera:

Ukwinyiganza kwose gukomeye, ugutera ubwoba, uguhinduka ningoga kuva ku kuryama gushika ku kwicara, canke gukora ku mubiri bikomeye, birashobora gutuma uruhome rw’umutima rushavura rudakora neza, bigatuma umutima uhagarara ubwo nyene.

Abarokozi bategerezwa kwubahiriza ingingo ngenderwako y'"ubugwaneza bwo kubaga":

1. Ntukigere wemera ko umurwayi ahagarara canke ngo agende, naho bovuga ko bumva bashoboye.
2. Gumana umurwayi ahagaze neza (apfutse ku mugongo). Guhindura umurwayi afise ubushuhe buke akaja mu kibanza co kwicara bituma umuntu agira ubushuhe buke bukwi na bukwi, bigatuma amaraso agenda mu mutima no mu bwonko.
3. Niwimure umurwayi ukoresheje ubuhinga bwo gutera ibiti canke urubaho rukomeye rwo mu mugongo, ugatuma umugongo, umutwe n’umubiri biguma mu ndege imwe ikomeye ataco uhinduye.
4. Gutwara buhoro buhoro ku bibanza bigoye. Abarokozi bitwaje igitanda bategerezwa kugenda mu buryo butari bwo kugira ngo ntibatere hejuru y’ivyo bikoko.
5. Irinde gukora ibintu bidakenewe mu ndimiro. Ntugerageze gunyota inzira y’impwemu bikomeye canke gutera inzira y’impwemu bikomeye kiretse iyo impwemu idahari rwose, kuko gukora ku mubiri bishobora gutuma umubiri ugira ububabare bw’umubiri (vagal reflex ventricular fibrillation).

Cardiopulmonary resuscitation (CPR) in the hypothermic patient¶

Performing CPR on a severely hypothermic patient involves special protocols that differ sharply from standard normothermic cardiac life support.

The 60-second pulse check¶

In standard Basic Life Support (BLS), a pulse check is limited to 10 seconds. In hypothermia, this rule is abandoned:

A severely chilled patient in Stage III or Stage IV hypothermia may have a heart rate of only 4 to 8 beats per minute, accompanied by an extremely faint pulse and shallow respirations occurring once every 30 to 45 seconds.

Taking only 10 seconds to check for a pulse will lead rescuers to assume the patient is in cardiac arrest when they are actually maintaining minimal, life-sustaining cardiac output.

Rescuers must palpate the carotid artery continuously for a full 60 seconds while closely observing the chest for respiratory movement.

If any pulse or spontaneous breath is detected within that 60-second window, do not perform chest compressions. Beginning chest compressions on a beating hypothermic heart will disrupt its organized rhythm and trigger ventricular fibrillation.

Executing hypothermic CPR¶

If, after a full 60 seconds of careful palpation, there is absolutely no detectable pulse and no respiratory effort, cardiac arrest is confirmed:

Begin chest compressions immediately at standard depth (5 cm to 6 cm / 2 inches to 2.4 inches) and rate (100 to 120 compressions per minute). The cold, stiff chest wall may feel remarkably rigid, requiring sustained physical effort.

Attach an Automated External Defibrillator (AED) or manual cardiac monitor. If a shockable rhythm (ventricular fibrillation or pulseless ventricular tachycardia) is identified, deliver a single defibrillation shock at maximum energy.

If the initial shock fails to restore an organized rhythm, do not deliver repeated shocks if the patient core temperature is below 30 °C (86 °F). Cold myocardium is almost completely refractory to electrical defibrillation. Repeated shocks cause thermal myocardial injury without converting the rhythm. Continue high-quality CPR and re-attempt defibrillation only after core temperature has climbed above 30 °C.

Withhold standard intravenous resuscitation medications (such as epinephrine and amiodarone) below 30 °C. Because the liver cannot metabolize drugs at cold temperatures, repeated doses of epinephrine accumulate to toxic concentrations in the bloodstream. When the patient rewarms, these accumulated doses release simultaneously, triggering massive vasoconstriction and fatal arrhythmias. Once the patient core temperature exceeds 30 °C, medications are administered at doubled time intervals (every 6 to 10 minutes) until core warmth approaches normal levels.

CPR must be maintained continuously during evacuation. Because the cold brain consumes minimal oxygen, patients have been successfully resuscitated without neurological impairment after more than 3 hours of continuous mechanical CPR.

Hypothermic CPR Decision Rules:
================================================================================
Rule 1: Check carotid pulse and breathing for a full 60 SECONDS.
Rule 2: If ANY pulse or breath is found -> DO NOT COMPRESS; monitor closely.
Rule 3: If no pulse -> Start CPR immediately (100 to 120 compressions/min).
Rule 4: Deliver 1 AED shock if advised; if unsuccessful, defer further shocks
        until active core rewarming raises temperature above 30 °C (86 °F).
Rule 5: Continue CPR continuously; "Not dead until warm and dead."
================================================================================

Passive external rewarming versus active core rewarming¶

Rewarming modalities are divided into two distinct therapeutic categories: passive external rewarming and active core rewarming. Choosing the proper method depends entirely on the hypothermia stage.

Passive external rewarming: for Stage I only¶

Passive external rewarming relies entirely on the patient own metabolic heat production to warm the body:

This method is appropriate only for Stage I (mild) hypothermia, where the patient is conscious, alert, and shivering vigorously.

The rescuer role in passive rewarming is to eliminate environmental heat loss:

1. Remove wet clothing immediately and replace it with dry, warm insulating garments.
2. Wrap the patient in multiple dry wool blankets, down sleeping bags, or fleece liners.
3. Add a vapor barrier (a large plastic tarp, trash bag, or mylar space blanket) around the outside of the insulation to stop evaporative cooling and wind infiltration.
4. Provide warm, high-calorie, sweetened beverages (hot cocoa, tea with sugar, warm broth) if the patient is fully conscious and swallowing easily. Avoid alcohol and caffeine.
5. Shivering thermogenesis will raise core body temperature at a rate of 1 °C to 2 °C (1.8 °F to 3.6 °F) per hour.

Active external core rewarming: for Stage II¶

In Stage II hypothermia, shivering has ceased, and the patient cannot generate their own heat. Rescuers must supply external thermal energy, but it must be applied strictly to the core:

Apply chemical heat packs, hot water bottles, or warmed towels directly to the central body areas: the axillae (armpits), the groin, and the anterior chest wall.

Never apply heat to the arms, hands, legs, or feet. Heating the extremities causes peripheral vasodilation, initiating afterdrop and circulatory collapse.

make sure that all heat packs are wrapped in cloth to prevent direct contact with cold, poorly perfused skin, which burns easily.

Construct a hypothermia wrap (burrito wrap) with at least three layers: an inner moisture-wicking layer, a thick insulating middle layer, and a complete outer wind- and water-proof shell.

Active core and extracorporeal rewarming: for Stages III and IV¶

Severe and profound hypothermia require active internal rewarming methods available only in advanced clinical hospital environments:

Humidified warmed oxygen (heated to 40 °C to 42 °C / 104 °F to 108 °F) administered via endotracheal tube or tight mask transfers heat directly to the pulmonary capillary bed adjacent to the left heart.

Intravenous crystalloid fluids (normal saline or lactated Ringer solution) heated precisely to 40 °C to 42 °C (104 °F to 108 °F). Cold IV fluids will worsen hypothermia; never infuse room-temperature IV fluids in severe cold emergencies.

Extracorporeal Life Support (ECLS): Extracorporeal Membrane Oxygenation (ECMO) and Cardiopulmonary Bypass (CPB) represent the absolute standard of care for hypothermic cardiac arrest.

Venous blood is extracted from the femoral vein, routed through a mechanical pump and heat exchanger that warms the blood directly, oxygenates it, and returns it to the arterial system. ECMO can rewarm a cold heart at a rate of 4 °C to 8 °C (7.2 °F to 14.4 °F) per hour while providing complete hemodynamic support, achieving survival rates exceeding 70 to 80 percent in patients without prior asphyxial trauma.

International emergency rescue protocols and mountain medicine¶

Emergency handling of severe accidental hypothermia is standardized across global mountain rescue agencies and medical associations.

North America: WMS, AHA, and wilderness SAR¶

In the United States and Canada, emergency hypothermia protocols are established by the Wilderness Medical Society (WMS), the American Heart Association (AHA), and the Heart and Stroke Foundation of Canada:

Wilderness Search and Rescue (SAR) teams operate with low-angle and high-angle litter systems that maintain continuous supine positioning during mountain extractions.

The AHA Emergency Cardiovascular Care (ECC) guidelines mandate that pulseless hypothermic victims receive uninterrupted CPR and transport to an ECMO-capable trauma facility whenever feasible.

Emergency services are reached across the United States and Canada by dialing 911.

United Kingdom and Ireland: Mountain Rescue and NHS¶

In the United Kingdom, mountain rescue teams (Mountain Rescue England and Wales, Scottish Mountain Rescue) operate under protocols aligned with the UK Resuscitation Council and British Mountaineering Council:

Rescue helicopters (HM Coastguard search and rescue aircraft) are equipped with onboard mechanical chest compression devices (such as LUCAS devices) that deliver rhythmic chest compressions during flight through turbulent weather.

National Health Service (NHS) major trauma centers maintain direct divert protocols, routing hypothermic cardiac arrest patients directly to regional cardiothoracic bypass units. Emergency dispatch is accessed via 999 or 112.

European Alps: ICAR MEDCOM and Chamonix mountain rescue¶

In continental Europe, particularly across the Alpine nations (France, Switzerland, Italy, Austria), mountain emergency medicine is guided by the International Commission for Mountain Emergency Medicine (ICAR MEDCOM):

Specialized alpine rescue units (such as the Chamonix PGHM in France and Air Zermatt in Switzerland) deploy on-site physicians via rescue winches directly to accident sites.

Rescuers use standardized hypothermia decision trees (the HOPE score: Hypothermia Outcome Prediction after ECLS) to determine which pulseless patients have a high probability of survival based on serum potassium levels, core temperature, and asphyxia status.

Across all European Union member states, emergency rescue dispatch is accessed by dialing 112.

Australia and New Zealand: Alpine SAR and NZRC¶

In Australia and New Zealand, hypothermia guidelines are overseen by the Australian Resuscitation Council (ARC) and the New Zealand Resuscitation Council (NZRC):

Alpine search and rescue teams operating in the Snowy Mountains of New South Wales, the Victorian Alps, and the Southern Alps of New Zealand encounter sudden-onset hypothermia during high-country blizzards.

Emergency protocols emphasize horizontal helicopter winching and field active core wrapping. In Australia, emergency dispatch is dialed as 000; in New Zealand, dial 111.

Ibibazo bikunda kubazwa¶

What exactly is the hypothermia afterdrop phenomenon?¶

Afterdrop is the continued cooling of core internal organs, including the brain and heart, after a patient has been rescued or during early rewarming. It occurs because physical thermal conduction continues moving heat from the core outward to colder tissues, and because warming cold arms and legs dilates blood vessels, causing icy, acidotic venous blood from the extremities to rush back into the heart, which can trigger sudden cardiac arrest.

Ni kubera iki kwinyiganza nabi ari akaga cane ku muntu afise ububabare bukomeye bw’umubiri?¶

Iyo umutima w’umuntu ukonjeje munsi ya 30 °C (86 °F), imitsi y’umutima n’uburyo bwo gutwara umuyagankuba biragira umunezero mwinshi cane kandi ntibihagarara neza. Gufata umurwayi nabi, kumusunika, guhindura aho ari mu buryo butunguranye canke kumureka akagenda, biratera umubabaro uruhome rw’umutima rukanye, bigatuma umutima uhita ugira ububabare bw’umutima, bugatuma umuntu apfa. Abarokozi bategerezwa gufata abashikiwe n’ububabare bw’umubiri n’ubugwaneza burengeje urugero, nk’ubw’ugubaga ibihe vyose.

Ni kubera iki abarokozi basuzuma ko umutima utera mu masegonda 60 yuzuye iyo umuntu afise ubushuhe bwinshi?¶

Mu gihe umuntu afise ubushuhe bukomeye, umutima n’uguhema biragabanuka cane kugira ngo umuntu azigame inguvu z’umubiri. Umurwayi yoshobora kugira umutima utera incuro zine canke zitandatu gusa ku munota, uherekejwe n’amajwi y’umutima atari make cane be n’uguhema gutoyi gutandukanijwe n’uguhagarika igihe kirekire. Gusuzuma mu masegonda cumi gusa bizotuma uwurokora uwo muntu yiyumvira ko ata n’umutima afise, kandi gukora ibikorwa vyo gufata umutima mu gikiriza birashobora gutuma umutima uhagarara bigatuma umuntu apfa.

Ni kubera iki utokwigera ushira amapaki y’ubushuhe ku maboko canke ku birenge vy’umuntu arwaye ubukonje?¶

Gushira amapaki y’ubushuhe ata guca ku ruhande ku biganza canke ku birenge birashusha imitsi y’amaraso iri ku ruhande, bigatuma ifunguka ningoga. Ivyo bituma amaraso akoranye, akonje, afise aside ava mu mpera z’umubiri, yihuta asubira mu mubiri, akaja mu mutima, bigatuma umuntu agira amazi ateye akaga kandi agasubira guhungabana. Ivyo gukoresha ubushuhe bwo hanze bikora bikwiye gushirwa gusa ku bice nyamukuru: mu bibero, mu rubavu no mu gikiriza.

Iryo jambo ngo "umuntu ntapfa gushika asusurutse kandi apfuye" risobanura iki?¶

Iryo tegeko ry’ubuvuzi risobanura yuko umurwayi afise ubushuhe bukomeye cane, asa n’uwapfuye burundu, ata n’umwe ashobora gutera umutima, ata n’umwe ahemeka, ata n’amaso ahagaze, kandi ata n’amaguru n’amaboko akomeye, yoshobora kuba agifise ubwonko n’umutima bishobora gukizwa. Imbeho ikaze ikingira ingingo ngenderwako ngo ntizigire umwuka mwiza. Abarwayi bafise umutima uhagaze cane barashobora gukira neza iyo umutima n’amahaha bikomejwe gushika umutima usubiye gushuha mu bitaro.

Icemezo c'ubutabazi bwa mbere¶

Gucungera ubushuhe bukomeye buterwa n’impanuka bisaba ubumenyi bujanye n’ubuvuzi, guhagarara neza ku mubiri, no kwubahiriza cane amategeko agenga ivy’ugufata umuntu mu buryo bw’ubugwaneza. Kumenya ingene umuntu yosuzuma ukuntu umuntu ameze mu mutwe bitewe n’imbeho, gukora isuzuma ry’umutima mu masegonda 60, gukora igikorwa co gukingira umwuka, no gutanga ivyiyumviro bikomeye mu gikiriza mu gihe umuntu ariko aragenda igihe kirekire, birashobora gukiza ubuzima mu bihe bikomeye vy’imbeho no mu bugaragwa.

Turahimiriza cane abantu bose bakunda kwisamaza hanze, abakunda imikino yo mu rushana, n’abafasha mu kibano kuronka icemezo cemewe mu vy’ubutabazi bwa mbere mu bugaragwa (WFA) canke ubutabazi bwa mbere busanzwe n’ugusubiza ubuzima mu mutima n’amahaha (CPR). Abatanga ubufasha bemewe nk’Umusaraba Mutukura w’Amerika, St John Ambulance, Umusaraba Mutukura w’Ubwongereza, n’Umusaraba Mutukura w’Ubwongereza baratanga inyigisho zitomoye mu bijanye no kwitwararika ibidukikije, gusubira gushushanya umubiri, no gutuma ubuzima buguma buhagaze neza.

Amasoko yasuzumwe¶

• Komisiyo Mpuzamakungu y’Ubuvuzi bw’Ivyihutirwa bwo mu Misozi (ICAR MEDCOM): Amabwirizwa yerekeye uburongozi bw’itongo n’ugushiramwo indwara y’ubushuhe bw’impanuka.
• Ishirahamwe ry’ubuvuzi ryo mu bugaragwa (WMS, Leta Zunze Ubumwe za Amerika): Amabwirizwa yerekeye ibikorwa vy’ubuvuzi ku bijanye n’ugusuzuma no kuvura umuntu afise ubushuhe burengeje urugero mu mpanuka.
• Ishirahamwe ry’umutima ryo muri Amerika (AHA, Leta Zunze Ubumwe za Amerika): Amabwirizwa yerekeye gusubiza ubuzima mu mutima n’amahaha no kwitwararika umutima n’imitsi vyihutirwa: Uguhagarara kw’umutima kubera ubushuhe bwinshi.
• Inama y’Uburayi y’Ugusubiza Ubuzima (ERC, Ubumwe bw’Uburaya): Amabwirizwa yerekeye Ugusubiza Ubuzima: Guhagarara kw’Umutima mu Bihe Bidasanzwe (Accidental Hypothermie).
• Inama y’Ubwongereza y’abaduga imisozi (BMC, Ubwongereza): Kwemera no kuvura vyihutirwa indwara y’ubushuhe bwo mu misozi.
• Inama y’Ugusubiza Ubuzima muri Australiya (ARC, Australiya): Ingingo ngenderwako 9.3.3: Gucungera Ivyihutirwa biva ku Bushuhe n’Imbeho.

Inyobora zifitaniye isano¶

• Ubuvuzi bwihutirwa bw'ubushuhe n'ubukonje
• Amabwirizwa y'abakuze yo gusubiza ubuzima mu mutima n'amahaha (CPR)
• Kwemera uguhungabana no kuvyifatamwo neza mu gihe c'ihungabana
• Inkubi y'umuyaga yo mu rushana n'imirongo ngenderwako yo kurokoka inkubi y'umuyaga
• Inomero z'ivyihutirwa hakurikijwe igihugu