First aid

This article is about general first aid for humans. For other uses, see First aid (disambiguation).

The universal first aid symbol

A US Navy corpsman gives first aid to an injured Iraqi citizen.

First aid is the first and immediate assistance given to any person with either a minor or serious illness or injury, with care provided to preserve life, prevent the condition from worsening, or to promote recovery until medical services arrive. First aid is generally performed by someone with basic medical or first response training. Mental health first aid is an extension of the concept of first aid to cover mental health, while psychological first aid is used as early treatment of people who are at risk for developing PTSD. Conflict first aid, focused on preservation and recovery of an individual's social or relationship well-being, is being piloted in Canada.

There are many situations that may require first aid, and many countries have legislation, regulation, or guidance, which specifies a minimum level of first aid provision in certain circumstances. This can include specific training or equipment to be available in the workplace (such as an automated external defibrillator), the provision of specialist first aid cover at public gatherings, or mandatory first aid training within schools. Generally, five steps are associated with first aid:

1. Assess the surrounding areas.
2. Move to a safe surrounding (if not already; for example, road accidents are unsafe to be dealt with on roads).
3. Call for help: both professional medical help and people nearby who might help in first aid such as the compressions of cardiopulmonary resuscitation (CPR).
4. Perform suitable first aid depending on the injury suffered by the casualty.
5. Evaluate the casualty for any fatal signs of danger, or possibility of performing the first aid again.

Early history and warfare

Skills of what is now known as first aid have been recorded throughout history, especially in relation to warfare, where the care of both traumatic and medical cases is required in particularly large numbers. The bandaging of battle wounds is shown on Classical Greek pottery from c. 500 BC, whilst the parable of the Good Samaritan includes references to binding or dressing wounds. There are numerous references to first aid performed within the Roman army, with a system of first aid supported by surgeons, field ambulances, and hospitals. Roman legions had the specific role of capsarii, who were responsible for first aid such as bandaging, and are the forerunners of the modern combat medic.

Further examples occur through history, still mostly related to battle, with examples such as the Knights Hospitaller in the 11th century AD, providing care to pilgrims and knights in the Holy Land.

Formalization of life saving treatments

During the late 18th century, drowning as a cause of death was a major concern amongst the population. In 1767, a society for the preservation of life from accidents in water was started in Amsterdam, and in 1773, physician William Hawes began publicizing the power of artificial respiration as means of resuscitation of those who appeared drowned. This led to the formation, in 1774, of the Society for the Recovery of Persons Apparently Drowned, later the Royal Humane Society, who did much to promote resuscitation.

Napoleon's surgeon, Baron Dominique-Jean Larrey, is credited with creating an ambulance corps, the ambulance volantes, which included medical assistants, tasked to administer first aid in battle.

In 1859, Swiss businessman Jean-Henri Dunant witnessed the aftermath of the Battle of Solferino, and his work led to the formation of the Red Cross, with a key stated aim of "aid to sick and wounded soldiers in the field". The Red Cross and Red Crescent are still the largest provider of first aid worldwide.

Esmarch bandage showing soldiers how to perform first aid

In 1870, Prussian military surgeon Friedrich von Esmarch introduced formalized first aid to the military, and first coined the term "erste hilfe" (translating to 'first aid'), including training for soldiers in the Franco-Prussian War on care for wounded comrades using pre-learnt bandaging and splinting skills, and making use of the Esmarch bandage which he designed. The bandage was issued as standard to the Prussian combatants, and also included aide-memoire pictures showing common uses.

In 1872, the Order of Saint John of Jerusalem in England changed its focus from hospice care, and set out to start a system of practical medical help, starting with making a grant towards the establishment of the UK's first ambulance service. This was followed by creating its own wheeled transport litter in 1875 (the St John Ambulance), and in 1877 established the St John Ambulance Association (the forerunner of modern-day St John Ambulance) "to train men and women for the benefit of the sick and wounded".

Also in the UK, Surgeon-Major Peter Shepherd had seen the advantages of von Esmarch's new teaching of first aid, and introduced an equivalent programme for the British Army, and so being the first user of "first aid for the injured" in English, disseminating information through a series of lectures. Following this, in 1878, Shepherd and Colonel Francis Duncan took advantage of the newly charitable focus of St John, and established the concept of teaching first aid skills to civilians. The first classes were conducted in the hall of the Presbyterian school in Woolwich (near Woolwich barracks where Shepherd was based) using a comprehensive first aid curriculum.

First aid training began to spread through the British Empire through organisations such as St John, often starting, as in the UK, with high risk activities such as ports and railways.

The first recorded first aid training in the United States took place in Jermyn, Pennsylvania in 1899.

List of injuries and diseases that require first aid

See also: Medical emergency

• Altitude sickness, which can begin in susceptible people at altitudes as low as 5,000 feet, can cause potentially fatal swelling of the brain or lungs.
• Allergic reaction: it is treated with anti-allergic medications. It can lead to anaphylaxis (read below).
• Anaphylaxis, a life-threatening condition in which the airway can become constricted and the patient may go into shock. It can be caused by an allergic reaction to any allergen (such as insect bites or peanuts). Anaphylaxis is initially treated with injection of epinephrine.
• Asphyxiation.
• Battlefield first aid—This protocol refers to treating shrapnel, gunshot wounds, burns and bone fractures as seen either in the traditional battlefield setting or in an area subject to damage by large-scale weaponry, such as a bomb blast.
• Bites and stings by insects and animals.
• Bleeding (external), treated by applying pressure (manually and later with a pressure bandage) to the wound site and elevating the limb if possible.
• Bleeding (internal), about internal wounds.
• Bone fracture, a break in a bone initially treated by stabilizing the fracture with a splint.
• Burns, which can result in damage to tissues and loss of body fluids through the burn site.
• Cardiac arrest, which leads to death in minutes, so it needs to call to the emergency medical services, and to keep the patient alive by using cardiopulmonary resuscitation (CPR), preferably combined with the use of an AED defibrillator, that would be requested soon. Even calling to the emergency services, there is often no time to wait for them to arrive, as 92 percent of people suffering a sudden cardiac arrest die before reaching hospital (according to the American Heart Association).
• Chest wounds (pneumothorax), also known as 'sucking chest woyunds', which are treated with an occlusive dressing with an opened side that lets air go out but not in.
• Childbirth.
• Choking, blockage of the airway which can quickly result in death due to lack of oxygen if the patient's trachea is not cleared. If an object blocks the airway, it can be removed by the anti-choking techniques.
• Cramps in muscles due to lactic acid build up caused either by inadequate oxygenation of muscle or lack of water or salt.
• Diabetic hyperglycemia, excess of blood sugar caused by diabetes. It could lead to diabetic coma (caused by the excess of blood sugar).
• Diabetic hypoglycemia, decrease in blood sugar caused by diabetes. It could lead to diabetic coma (caused by the low levels of blood sugar).
• Diarrhea, which can lead to severe dehydration.
• Diving disorders.
• Drowning, including related asphyxia.
• Dysmenorrhea.
• Electrical injury
• Fever, which is usually a symptom, but it requires its own treatment.
• Gastrointestinal bleeding.
• Hair tourniquet a condition where a hair or other thread becomes tied around a toe or finger tightly enough to cut off blood flow.
• Heart attack, or inadequate blood flow to the blood vessels supplying the heart muscle.
• Heat stroke, also known as sunstroke, which is a form of hyperthermia because of high temperatures in the environment. It also tends to occur during heavy exercise in high humidity, or with inadequate water, though it may occur spontaneously in some chronically ill persons. Sunstroke, especially when the patient has been unconscious, often causes major damage to body systems such as brain, kidney, liver, gastric tract. Unconsciousness for more than two hours usually leads to permanent disability. Emergency treatment involves rapid cooling of the patient.
• Heat syncope, another stage in the same process as heat stroke, occurs under similar conditions as heat stroke and is not distinguished from the latter by some authorities.
• Hyperglycemia, excess of blood sugar. It usually happens because of diabetes, and could lead to diabetic coma (caused by the excess of blood sugar).
• Hypoglycemia, decrease of blood sugar. As in hyperglycemia, it usually happens because of diabetes (in an insulin shock due to diabetic hypoglycemia), and could lead to diabetic coma caused by the low levels of blood sugar.
• Hypothermia, or Exposure, occurs when a person's core body temperature falls below 33.7 °C (92.6 °F). First aid for a mildly hypothermic patient includes rewarming, which can be achieved by wrapping the affected person in a blanket, and providing warm drinks, such as soup, and high energy food, such as chocolate. However, rewarming a severely hypothermic person could result in a fatal arrhythmia, an irregular heart rhythm.
• Infarction of the heart, which is a form of ischemia (lack of oxygen) in myocardial tissue.
• Insulin shock (a diabetic hypoglycemia).
• Joint dislocation.
• Muscle strains.
• Poisoning, which can occur by injection, inhalation, absorption, or ingestion.
• Seizures, or a malfunction in the electrical activity in the brain. Three types of seizures include a grand mal (which usually features convulsions as well as temporary respiratory abnormalities, change in skin complexion, etc.) and petit mal (which usually features twitching, rapid blinking, or fidgeting as well as altered consciousness and temporary respiratory abnormalities).
• Shock and electric shock - electrical injury.
• Sprains, a temporary dislocation of a joint that immediately reduces automatically but may result in ligament damage.
• Stroke, a temporary loss of blood supply to the brain.
• Sucking chest wounds (pneumothorax), treated with an occlusive dressing with an opened side that lets air go out but not in.
• Testicular torsion.
• Toothache, which can result in severe pain and loss of the tooth but is rarely life-threatening, unless over time the infection spreads into the bone of the jaw and starts osteomyelitis.
• Wounds with external bleeding, which includes lacerations, incisions, abrasions and other bleeding wounds.
• Wounds with internal bleeding, about internal wounds.

Many accidents can happen in homes, offices, schools and laboratories, and require immediate attention before the patient is attended by the doctor

Aims of first aid

The primary goal of first aid is to prevent death or serious injury from worsening. The key aims of first aid can be summarized with the acronym of 'the three Ps':

• Preserve life: The overriding aim of all medical care which includes first aid, is to save lives and minimize the threat of death. First aid done correctly should help reduce the patient's level of pain and calm them down during the evaluation and treatment process.
• Prevent further harm: Prevention of further harm includes addressing both external factors, such as moving a patient away from any cause of harm, and applying first aid techniques to prevent worsening of the condition, such as applying pressure to stop a bleed from becoming dangerous.
• Promote recovery: First aid also involves trying to start the recovery process from the illness or injury, and in some cases might involve completing a treatment, such as in the case of applying a plaster to a small wound.

First aid is not medical treatment, and cannot be compared with what a trained medical professional provides. First aid involves making common sense decisions in the best interest of an injured person.

Setting the priorities

First aid protocols (such as ATLS, BATLS and SAFE-POINT) are based on defining which are the priorities and the correct execution of their steps for saving human life.

A major benefit of those protocols is that they require minimum resources, time and skills, and have a great degree of success.

ABCDE and cABCDE method

This method is the general protocol of first aid and implies a general view of first aid. It was initially developed by Dr Peter Safar in the 1950s and is used as a basis by some protocols as ATLS, and its BATLS version.

Its mnemonic is ABCDE or its improved version cABCDE:

• catastrophic bleeding (massive external bleeding).

• Airway (clearing airways).
• Breathing (ensuring respiration).
• Circulation (ensuring effective cardiac output).
  In some cases, Defibrillation (for cardio-respiratory failure) is included here, or in 'Disability' (as a double mnemonic 'D').
• Disability (neurological condition, level of glucose can also be examined).
• Exposure (overall examination, environment).

Details of ABCDE and cABCDE method

Source:

• Airway (clearing airways): If the patient responds in a normal voice, then the airway is patent. Airway obstruction can be partial or complete. Signs of a partially obstructed airway include a changed voice, noisy breathing (e.g., stridor), and an increased breathing effort. With a completely obstructed airway, there is no respiration despite great effort (i.e., paradox respiration, or "see-saw" sign). A reduced level of consciousness is a common cause of airway obstruction, partial or complete. A common sign of partial airway obstruction in the unconscious state is snoring. Untreated airway obstruction can rapidly lead to cardiac arrest. All health care professionals, regardless of the setting, can assess the airway as described and use a head-tilt and chin-lift maneuver to open the airway (however, the head is not tilted back in the case of babies, so they can breathe). With the proper equipment, suction of the airways to remove obstructions, for example, blood or vomit, is recommended. If possible, foreign bodies causing airway obstruction should be removed. In the event of a complete airway obstruction, treatment should be given according to current guidelines. In brief, first aid for conscious patients of choking uses anti-choking procedures (usually five back blows, alternating with five abdominal thrusts, or alternating with five chest thrusts in the case of the pregnant and the very obese victims, until the obstruction is relieved). If the victim becomes unconscious, it is required, according to guidelines, to call for help to emergency medical services and to any useful people that is near and to start cardiopulmonary resuscitation for unconscious victims of choking (attempting to extract the object, with extreme care, from time to time). In modern times, some commercial anti-choking devices have been invented to simplify the solution of choking. Importantly, high-flow oxygen should be provided to all critically ill persons as soon as possible.
• Breathing (ensuring respiration): In all settings, it is possible to determine the respiratory rate, inspect movements of the thoracic wall for symmetry and use of auxiliary respiratory muscles, and percuss the chest for unilateral dullness or resonance. Cyanosis, distended neck veins, and lateralization of the trachea can be identified. If a stethoscope is available, lung auscultation should be performed and, if possible, a pulse oximeter should be applied. Tension pneumothorax must be relieved immediately by inserting a cannula where the second intercostal space crosses the midclavicular line (needle thoracocentesis). Bronchospasm should be treated with inhalations. If breathing is insufficient, assisted ventilation must be performed by giving rescue breaths with or without a barrier device. Trained personnel should use a bag mask if available.
• Circulation (internal bleeding): The capillary refill time and pulse rate can be assessed in any setting. Inspection of the skin gives clues to circulatory problems. Color changes, sweating, and a decreased level of consciousness are signs of decreased perfusion. If a stethoscope is available, heart auscultation should be performed. Electrocardiography monitoring and blood pressure measurements should also be performed as soon as possible. Hypotension is an important adverse clinical sign. The effects of hypovolemia can be alleviated by placing the patient in the supine position and elevating the patient's legs. An intravenous access should be obtained as soon as possible and saline should be infused.
• Disability (neurological condition): The level of consciousness can be rapidly assessed using the AVPU method, where the patient is graded as alert (A), voice responsive (V), pain responsive (P), or unresponsive (U). Alternatively, the Glasgow Coma Score can be used.16 Limb movements should be inspected to evaluate potential signs of lateralization. The best immediate treatment for patients with a primary cerebral condition is stabilization of the airway, breathing, and circulation. In particular, when the patient is only pain responsive or unresponsive, airway patency must be ensured, by placing the patient in the recovery position, and summoning personnel qualified to secure the airway. Ultimately, intubation may be required. Pupillary light reflexes should be evaluated and blood glucose measured. A decreased level of consciousness due to low blood glucose can be corrected quickly with oral or infused glucose.
• Exposure (overall examination, environment): Signs of trauma, bleeding, skin reactions (rashes), needle marks, etc., must be observed. Bearing the dignity of the patient in mind, clothing should be removed to allow a thorough physical examination to be performed. Body temperature can be estimated by feeling the skin or using a thermometer when available.

ABC and CABD method

It is a simplified version of the previous cABCDE (or ABCDE) protocol, and focuses in applying cardio-pulmonary resuscitation to a patient. The American Heart Association and the International Liaison Committee on Resuscitation teach it as a reference.

Its mnemonic is ABC or CAB-D (an improvement in the sequence for most of the cases):

• Circulation or Chest compressions.
• Airway: attempt to open the airway (using a head-tilt and chin-lift technique; not in the case of babies, which require avoid tilting the head).
• Breathing or Rescue Breaths.
• Defibrillation: use of an automated external defibrillator to recover heart function.

European method

This method has been studied and employed for a long time in many European countries, as France. It can be applied solely or to a certain degree, usually combining it with the common cABCDE (ABCDE) method or its simplified CABD (ABC) variant. The European method has a wider range than them, and their steps include tasks that are previous to the first aid techniques themselves, despite no official mnemonic helps to remember those steps:

• Protection: safety of the patient and rescuer.
• Evaluation of the patient.
• Alerting to medical services and bystanders.
• Performing the first aid practices. The CABD (or ABC) method and many details of the wider cABCDE (or ABCDE) method would be included in this step.

AMEGA method

It is similar to the European method, because it also has a wider range than the common cABCDE (or ABCDE) method, and includes tasks that are previous to the first aid techniques. The order of the steps is changed, and the experience with it is lesser, but it adds the idea of a posterior 'aftermath' phase. The mnemonic AMEGA refers to:

• Assess the situation, looking for risks.
• Make safe the situation, after having identified the risks.
• Emergency aid. Performing the first aid practices.
• Get help. Asking for emergency help to medical services and bystanders.
• Aftermath. The aftermath tasks include recording and reporting, continued care of patients and the welfare of responders and the replacement of used first aid kit elements.

Key basic skills

Certain skills are considered essential to the provision of first aid and are taught ubiquitously.

Displacement skills

If there are dangers around (such as fire, electric dangers or others) the patient has to be moved to a safe place, where providing the required first aid is possible.

If the patient seems to have a serious spinal injury (in the back or the neck part), it is convenient to move it as little as possible, and, in case of having to move or rotate it, it would be done very carefully and holding the head in the same position. Usually, the patient would end up lying down, in a face-up position, on a sufficiently firm surface (for example, on the floor, which allows to perform the chest compressions of cardiopulmonary resuscitation).

Displacement of victims to a safe place

• 
  A victim with dangerous injuries in the spine (in the back or the neck), which indicate a risk to the future mobility, can be carefully transferred by several rescuers that work coordinately.
  The victim's head would be kept in the same position.
• 
  When there is a victim with dangerous injuries in the spine (in the back or the neck) and a rescuer without instruments, the rescuer can try to carry the victim carefully through the Rautek maneuver (as in the picture).
  The victim's head can be supported on the rescuer to try to soften the movements.
• 
  A victim without dangerous injuries in the spine (in the back or the neck) can be pulled through the floor, which is easier on a blanket, carpet or another tissue located under most of the body.
  A dangerous injury in the spine would require a higher or much thicker base (as a litter or mattress), for a quick and stable displacement.

In case of tongue fallen backwards, blocking the airway, it is necessary to hyperextend the head and pull up the chin, so that the tongue lifts and clears the airway.

Airway, Breathing, and Circulation skills

ABC method stands for Airway, Breathing, and Circulation. The same mnemonic is used by emergency health professionals.

It is focused on critical life-saving intervention, and it must be rendered before treatment of less serious injuries.

Attention must first be brought to the airway to ensure it is clear. An obstruction (choking) is a life-threatening emergency. If an object blocks the airway, it requires anti-choking procedures. Following any evaluation of the airway, a first aid attendant would determine adequacy of breathing and provide rescue breathing if necessary.

Assessment of circulation is now not usually carried out for patients who are not breathing, with first aiders now trained to go straight to chest compressions (and thus providing artificial circulation) but pulse checks may be done on less serious patients.

Some organizations add a fourth step of "D" for Deadly bleeding or Defibrillation, while others consider this as part of the Circulation step simply referred as Disability. Variations on techniques to evaluate and maintain the ABCs depend on the skill level of the first aider. Once the ABCs are secured, first aiders can begin additional treatments or examination, as required if they possess the proper training (such as measuring pupil dilation).

Some organizations teach the same order of priority using the "3Bs": Breathing, Bleeding, and Bones (or "4Bs": Breathing, Bleeding, Burns, and Bones). While the ABCs and 3Bs are taught to be performed sequentially, certain conditions may require the consideration of two steps simultaneously. This includes the provision of both artificial respiration and chest compressions to someone who is not breathing and has no pulse, and the consideration of cervical spine injuries when ensuring an open airway.

Preserving life

The patient must have an open airway—that is, an unobstructed passage that allows air to travel from the open mouth or uncongested nose, down through the pharynx and into the lungs. Conscious people maintain their own airway automatically, but those who are unconscious (with a GCS of less than 8) may be unable to do so, as the part of the brain that manages spontaneous breathing may not be functioning.

Whether conscious or not, the patient may be placed in the recovery position, laying on their side. In addition to relaxing the patient, this can have the effect of clearing the tongue from the pharynx. It also avoids a common cause of death in unconscious patients, which is choking on regurgitated stomach contents.

The airway can also become blocked by a foreign object. To dislodge the object and solve the choking case, the first aider may use anti-choking methods (such as 'back slaps' and 'abdominal thrusts').

Once the airway has been opened, the first aider would reassess the patient's breathing. If there is no breathing, or the patient is not breathing normally (e.g., agonal breathing), the first aider would initiate CPR, which attempts to restart the patient's breathing by forcing air into the lungs. They may also manually massage the heart to promote blood flow around the body.

If the choking person is an infant, the first aider may use anti-choking methods for babies. During that procedure, series of five strong blows are delivered on the infant's upper back after placing the infant's face in the aider's forearm. If the infant is able to cough or cry, no breathing assistance should be given. Chest thrusts can also be applied with two fingers on the lower half of the middle of the chest. Coughing and crying indicate the airway is open and the foreign object will likely to come out from the force the coughing or crying produces.

A first responder should know how to use an Automatic External Defibrillator (AED) in the case of a person having a sudden cardiac arrest. The survival rate of those who have a cardiac arrest outside of the hospital is low. Permanent brain damage sets in after five minutes of no oxygen delivery, so rapid action on the part of the rescuer is necessary. An AED is a device that can examine a heartbeat and produce electric shocks to restart the heart.

A first aider should be prepared to quickly deal with less severe problems such as cuts, grazes or bone fracture. They may be able to completely resolve a situation if they have the proper training and equipment. For situations that are more severe, complex or dangerous, a first aider might need to do the best they can with the equipment they have, and wait for an ambulance to arrive at the scene.

First aid kits

A first aid box

A first aid kit consists of a strong, durable bag or transparent plastic box. They are commonly identified with a white cross on a green background. A first aid kit does not have to be bought ready-made. The advantage of ready-made first aid kits are that they have well organized compartments and familiar layouts.

Contents

There is no universal agreement upon the list for the contents of a first aid kit. The UK Health and Safety Executive stress that the contents of workplace first aid kits will vary according to the nature of the work activities. As an example of possible contents of a kit, British Standard BS 8599 First Aid Kits for the Workplace lists the following items:

• Information leaflet
• Medium sterile dressings
• Large sterile dressings
• Bandages
• Triangular dressings
• Safety pins
• Adhesive dressings
• Sterile wet wipes
• Microporous tape
• Nitrile gloves
• Face shield
• Foil blanket
• Burn dressings
• Clothing shears
• Conforming bandages
• Finger dressing
• Antiseptic cream
• Scissors
• Tweezers
• Cotton

Training principles

First aid scenario training in progress

Basic principles, such as knowing the use of adhesive bandage or applying direct pressure on a bleed, are often acquired passively through life experiences. However, to provide effective, life-saving first aid interventions requires instruction and practical training. This is especially true where it relates to potentially fatal illnesses and injuries, such as those that require CPR; these procedures may be invasive, and carry a risk of further injury to the patient and the provider. As with any training, it is more useful if it occurs before an actual emergency. And, in many countries, calling emergency medical services allows listening basic first aid instructions over the phone while the ambulance is on the way.

Training is generally provided by attending a course, typically leading to certification. Due to regular changes in procedures and protocols, based on updated clinical knowledge, and to maintain skill, attendance at regular refresher courses or re-certification is often necessary. First aid training is often available through community organizations such as the Red Cross and St. John Ambulance, or through commercial providers, who will train people for a fee. This commercial training is most common for training of employees to perform first aid in their workplace. Many community organizations also provide a commercial service, which complements their community programmes.

1.Junior level certificate Basic Life Support

2.Senior level certificate

3.Special certificate

Types of first aid which require training

Shown here is an example of a way for people to practice CPR in a safe and reliable manner.

There are several types of first aid (and first aider) that require specific additional training. These are usually undertaken to fulfill the demands of the work or activity undertaken.

• Aquatic/Marine first aid is usually practiced by professionals such as lifeguards, professional mariners or in diver rescue, and covers the specific problems which may be faced after water-based rescue or delayed MedEvac.
• Battlefield first aid takes into account the specific needs of treating wounded combatants and non-combatants during armed conflict.
• Conflict First Aid focuses on support for stability and recovery of personal, social, group or system well-being and to address circumstantial safety needs.

• Hyperbaric first aid may be practiced by underwater diving professionals, who need to treat conditions such as decompression sickness.
• Oxygen first aid is the providing of oxygen to casualties with conditions resulting in hypoxia. It is also a standard first aid procedure for underwater diving incidents where gas bubble formation in the tissues is possible.
• Wilderness first aid is the provision of first aid under conditions where the arrival of emergency responders or the evacuation of an injured person may be delayed due to constraints of terrain, weather, and available persons or equipment. It may be necessary to care for an injured person for several hours or days.
• Mental health first aid is taught independently of physical first aid. How to support someone experiencing a mental health problem or in a crisis situation. Also how to identify the first signs of someone developing mental ill health and guide people towards appropriate help.

First aider of the British Red Cross accompanies parade of morris dancers at the Knutsford Royal May Day, Knutsford, Cheshire, England, 2012

First aid services

Some people undertake specific training in order to provide first aid at public or private events, during filming, or other places where people gather. They may be designated as a first aider, or use some other title. This role may be undertaken on a voluntary basis, with organisations such as the Red Cross society and St. John Ambulance, or as paid employment with a medical contractor.

People performing a first aid role, whether in a professional or voluntary capacity, are often expected to have a high level of first aid training and are often uniformed.

Symbols

Further information: Emblems of the Red Cross § Use of the emblems

Although commonly associated with first aid, the symbol of a red cross is an official protective symbol of the Red Cross. According to the Geneva Conventions and other international laws, the use of this and similar symbols is reserved for official agencies of the International Red Cross and Red Crescent, and as a protective emblem for medical personnel and facilities in combat situations. Use by any other person or organization is illegal, and may lead to prosecution.

The internationally accepted symbol for first aid is the white cross on a green background shown below.

Some organizations may make use of the Star of Life, although this is usually reserved for use by ambulance services, or may use symbols such as the Maltese Cross, like the Order of Malta Ambulance Corps and St John Ambulance. Other symbols may also be used.

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  Star of Life
• 
  Civil defense
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  Emblem of the Red Crystal
• 
  Emblem of the Red Crescent
• 
  Emblem of the Red Cross
• 
  ISO First Aid Symbol (Crescent variant)
• 
  ISO First Aid Symbol
• 
  Maltese or Amalfi Cross

External links

• First Aid Guide at the Mayo Clinic
• First aid from the British Red Cross – including first aid tips and first aid training information
• First aid from St John Ambulance – first aid information and advice