Ice Rescue, cold water drowning and Hypothermia

Ice Rescue, cold water drowning and Hypothermia Ice Rescue, Cold Water Drowning and Hypothermia General Cold Information: Heat always travels away from its source to a cooler place or object. The body loses heat in several ways: - By respiration: Every inhaled breath of cold air is warmed by the respiratory system. This reduces the body's available heat to warm itself. Heat also leaves the body with every expired breath. - By conduction: Any body part touching something cold will lose heat to the cold item. That includes cold clothes and especially cold, wet clothes. - By convection: Air passing over the body will take heat away from the body. - By evaporation: Evaporation is the process of converting liquid to gas. The body naturally uses sweating to cool the body surface. Even in cool or cold weather your body will sweat if you are doing strenuous activity or are dressed too warmly. If you then remove clothing layers to "cool off", the water on the body evaporates as the body surface cools. You can change the rate and amount of heat loss in several ways: - Wear insulating clothing: dry, still air and certain materials act as insulators. Layers of dry clothing work well to trap air. Certain materials including wool, down and numerous „design specific synthetics? also provide pockets of trapped air. - Increase heat production: one of the body's responses to the cold is to shiver. This increases cell metabolism and thereby creates heat. - Cover the body. Get it out of the cold and wind. NOTE: A wet body loses heat quicker through both conduction and convection than a dry body. Water is a very good heat conductor as it touches a greater amount of body surface than a hard object can. Alcohol and cold are NOT a good combination for the body. Alcohol dilates surface blood vessels which increases blood circulation to the skin surface where it can lose more heat. Blankets trap body heat (OR COLD) and act as an insulator from the environment. THEY DO NOT ADD HEAT TO THE BODY. If the body is not producing more heat than it is losing, the body temperature will fall. If the body is not producing sufficient heat, or if it is wrapped in cold clothes, or (worse) cold and wet clothes, blankets will only help by keeping the outside cold and wind from reaching the body. The body temperature will continue to fall. Therefore, you MUST get the patient out of cold, wet clothes as soon as possible. Isothermal blankets that reflect the heat back toward the body should be used as the first layer of blankets, when possible. Your body does its best to keep your head warm. Just covering your head will reduce heat loss through radiation considerably. Always wear a hat. Your ears are prone to frostbite from extended exposure to cold; make sure you keep them covered as well. Avoid wearing earrings, especially pierced, as they help to cool the ear lobes. Wind Chill – convection of heat from the body caused by the movement of cold or cool air. (1) - Affects only living things - Calculations based on temps and wind speed - May cause problems with very limited exposure - Older and younger are most affected Ice Rescue, Cold Water Drowning and Hypothermia Page 2 of 5 The Facts of Ice (1): - Clouded and discolored ice is very weak - Ice less than 4” thick should not be expected to hold several persons - Shoreline ice is dangerous due to tidal changes, and expansion and contraction of ice formations enter of deep lakes and ponds make poor ice due to currents and wind effect - C - New ice is much stronger than clouded ice - Clear ice is much stronger than clouded ice - Ice around obstructions can be very weak - Many factors affect the strength of ice Mammalian Diving Reflex: A reaction that occurs when the face is submerged in water. Breathing is inhibited, the heart rate slows, and a surge of blood is sent to the brain, heart, and lungs. The colder the water, the more intense the response. The younger the person, the quicker the reflex. Other Factors Which Influence Exposures: - Size and weight of victim or rescuer - Type of clothing worn by persons - Parts of individual exposed Important NOTE: Due to the potentially depressed state of the cardiopulmonary system, all pulse checks should be for at least 30 seconds. 60 is better. All respiratory checks should also be for a full minute. Frostbite: Usually occurs due to prolonged exposure to cold. Most common on exposed skin areas or areas with poor circulation, including ears, cheeks, nose, fingers and toes. - DO: Remove any wet clothes not stuck or frozen, loosen any restrictive clothing, cover with sterile dressings. Treat gently so that the frozen part(s) does not break off. - DO NOT: Rewarm, massage or apply tight dressings. Hypothermia: A lowering of the core or internal body temperature below 95 degrees. Caused by either prolonged exposure to cold or sudden exposure, such as cold water immersion. The onset of hypothermia can be accelerated due to alcohol intake, medications or medical conditions, wind exposure, or clothing getting wet. Exposure to the cold does not need to be at freezing temperatures. "Normal" body temperature is 98.6. Each body has different capabilities for producing and retaining heat. The body operates within a very small range of acceptable temperatures. Neither too hot nor too cold is good. Hypothermia patient response overview: - Core temps of 96º to 99º F can cause shivering - 90º to 95º F causes intense shivering and difficulty speaking - 86º to 90º F causes stiff muscles, jerky movements, dulled thinking - 81º to 85º F patient is irrational, stuporous, slowed vital functions - 78º to 80º F patient becomes unconscious, erratic heart beat Ice Rescue, Cold Water Drowning and Hypothermia Page 3 of 5 Systemic Hypothermia: Core Temp 93-95F 89-92F 80-88F <88 Signs & Symptoms Shivering, foot Loss of coordination, Coma Apparent death stomping muscle stiffness Shivering stops Cardiorespiratory Constricted blood Slow respirations Weak, very slow pulse, Cardiac Arrest Response vessels, rapid breathing Slow pulse very slow respirations Level of Withdrawn Confused, lethargic Unresponsive Unresponsive Consciousness Sleepy 90-95F is considered mild hypothermia less than 90F is considered severe hypothermia For patients suffering from poor circulation and/or with poor nutrition, "urban" hypothermia can develop even with relatively high temperatures. Many factors come into play: their bodies are unable to produce heat, they frequently opt for medication over food or heat, they dress insufficiently because they either don't have the clothes or they don't realize they are cold. Dementia and other medical problems don't help the situation and can accelerate the process. If you add alcohol, exposure to the elements including rain or snow, or certain medications to the mix, the results can be very rapid temperature drops. Children are susceptible because they don't know enough to put on more clothes, stay dry and come in out of the cold. Infants are more prone to hypothermia if they have been sick and because they cannot shiver. Certain injuries and illnesses decrease the body's ability to deal with heat/cold including: burns, shock, spinal cord and head injuries, stroke, diabetes and other circulatory conditions, and hypoglycemia. Diagnosis: Place the back of your ungloved hand under the patient's clothes on their abdomen. If it is cool to the touch, they are probably experiencing a cold emergency. Use your tympanic (ear) thermometer to measure core temperature. If you can't get a tympanic reading, consider taking a rectal temperature using a hypothermia thermometer. Both your initial temperature and how the core temperature changes will be important for ER and enroute treatment. Start an ECG to monitor for arrhythmias as soon as possible. Treatment: - Never assume that a cold, pulseless patient is dead. No patient is dead until they are warm and pulseless. - Your goal is to stabilize vital signs and prevent any further heat loss. - Do not allow the patient to walk. Remove all wet clothes, get them into a warm environment, and wrap in an isothermal blanket. - Absolutely no food, drink, stimulants, or smoking or chewing tobacco. - Contact the ER to discuss rewarming if you are not sure. If the patient is responding to passive rewarming you can add hot packs at neck and groin (be sure to shield them so you don't burn the patient). Ice Rescue, Cold Water Drowning and Hypothermia Page 4 of 5 Making the Ice Rescue: - Consider calling for mutual aid for additional manpower or for additional ice rescue equipment. - Dive Rescue team should be activated as a precaution in case the patient submerges before you can ffect the rescue. a - Bystanders should be restrained from going out on the ice. - Rescuers must complete all preparation quickly, but not succumb to bystanders wishing for a faster response. - Have one rescuer make verbal and eye contact with the victim. Talk with them to determine level of consciousness. Let them know help is coming and to try to keep their head out of the water. - Try to ascertain how long they have been in the water. - Remember: REACH, THROW, ROW, GO. Depending on the circumstances, use the safest means to get the patient out of the water. ANY rescuer going out on the ice should be in an ice rescue suit and have a lifeline to shore. - Rescuer going out to victim should remove shoes, glasses, jewelry, wallet, radios, pagers and cell phones, anything sharp that could snag and tear inside suit (belt buckles, pens, knives, etc.) before donning ice rescue suit. Ideally have two rescuers in suits. Verify that each has two sets of ice rescue spikes. - Before leaving shore, make sure that the rescuer has a line reaching back to shore. If possible bring a rescue harness; also attached to the rope, and a pole. Use bystanders if necessary to handle the line on shore. - Approach the victim in a semicircular approach so that if you break through the ice you are not on the direct path from shore to victim. This may allow a more direct and faster removal of the victim. - Walk, if you can, using a pole to check ice stability. If ice is not safe to walk on, spread out your body weight even further by using the pole from side to side. - If the ice breaks under you, try to keep your face out of the water. - Rescuer should continue to talk with the victim during the approach. Get behind the victim and let them know what you will be doing. - Enter the water behind the victim if the hole is large enough. Apply the rescue harness around the victim and in conjunction with the crew on shore pulling, lift the victim up onto the ice. - Roll the victim onto their back and tow the victim back to shore. On shore Medical Prep and Response - Medical Personnel: Contact medical control and let them know you are involved in an Ice Rescue and that you will have a hypothermia patient. Discuss treatment including possible patient rewarming. - Turn the heat up „high? in the back of the ambulance and keep the doors closed. - Keep the stretcher in the ambulance until patient is enroute to shore if possible. - When stretcher is removed, cover with extra blankets and keep blankets closed until patient is ready to be put on the stretcher. KEEP SOME BLANKETS IN AMBULANCE for after patient is in ambulance and wet clothes have been removed. - Try to stay as dry as you can as the medical responder! - Avoid all rough handling of the patient. Hypothermic patients hearts are prone to ventricular fibrilllation from rough handling. - DO NOT ALLOW THE PATIENT TO WALK! Use a backboard, Reeves style stretcher, or basket stretcher with a backboard in it to move the patient to ambulance stretcher. Make sure you cover the patient, including their head, to reduce convection. Ice Rescue, Cold Water Drowning and Hypothermia Page 5 of 5 - If you have a long outside transport for a patient from where they are rescued to the ambulance: o Place an oxygen mask on the patient and set a hot pack in front of it. The hot pack will warm the mask and therefore the air they inhale. If using a nonrebreather mask, you can also place the hot pack under the reservoir bag. In any use of a hot pack, make sure it is not burning the patient directly or indirectly and do not apply heat over any frostbitten area(s). o Consider removing wet clothing and covering the patient with dry blankets - Once patient is in ambulance, remove clothing and dry the patient. Cover with dry blankets. Cover the head. - Remember that blankets do not add warmth (unless they are warmed). All they do is keep warmth (or cold) in and reduce convection. - Once in the ambulance humidified oxygen is preferred. A heat pack can be taped to the humidifier to preheat the air. - Get a set of vitals including core body temperature, preferably using a tympanic (ear) thermometer with hypothermia settings. Rewarming the patient: ONLY IF DIRECTED BY MEDICAL CONTROL or PROTOCOL. If patient is conscious and alert, active rewarming. If patient is unconscious or not responding appropriately, passive rewarming only! - IV fluids can be warmed by wrapping a hot pack around the IV bag using tape, a triangular bandage or ACE. Or if you carry an electric heating pad, you can use that once in the ambulance. ot packs can be placed in the groin, on the lateral chest and around the neck. Make sure they are - H covered so that they do not burn the patient - Warm the oxygen per above: DO NOT APPLY HEAT TO THE O2 TANK or REGULATOR! Any rescuer who has been in the water should be transported to the hospital as a precaution. Any other rescuers who exhibit any signs of hypothermia or frostbite should also be transported to the hospital. References: Maryland Fire and Rescue Institute Ice and Cold Water Rescue “Drill of the Month” (1) American Academy of Orthopaedic Surgeons, Emergency Care and Treatment of the Sick and Injured, 7th Edition, pages 21, 382-383, 421, and 467-469. Dive Rescue International Ice Rescue Course. NYS Department of Health ALS and BLS Protocols Critical Response Network, PO Box 248, Patterson, NY 12563, email: critrespnet@aol.com NOTE: this handout was reviewed 12/08. It should be reviewed and updated prior to any use or distribution.