artificial respiration

American Heritage Dictionary:

artificial respiration

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n.
A procedure used to restore or maintain respiration in a person who has stopped breathing. The method uses mechanical or manual means to force air into and out of the lungs in a rhythmic fashion.


Britannica Concise Encyclopedia:

artificial respiration

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Breathing induced by any of several techniques in a person who has stopped or is having difficulty breathing. It consists chiefly of keeping the air passage open and inducing inhalation and exhalation. It does not include chest compressions to maintain circulation ( cardiopulmonary resuscitation). The primary method is mouth-to-mouth breathing, in which the rescuer breathes into the victim's mouth, with pauses to allow exhalation.

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artificial respiration, any measure that causes air to flow in and out of a person's lungs when natural breathing is inadequate or ceases, as in respiratory paralysis, drowning, electric shock, choking, gas or smoke inhalation, or poisoning. Respiration can be taken over by an artificial lung (especially in respiratory paralysis), a pulmotor, or any other type of mechanical respirator (see resuscitator). In emergency situations, however, when no professional help is available, rescuers undertake the mouth-to-mouth or mouth-to-nose method of artificial respiration. First, any foreign material is swept out of the mouth with the hand. The victim is placed on his back, with the head tilted backward and chin pointing upward so that the tongue does not block the throat. The reviver's mouth is then placed tightly over the victim's mouth or nose, with the victim's nostrils or mouth held shut. For a small child or infant, the reviver places his mouth firmly over the mouth and nose. The reviver takes a deep breath and blows into the victim's mouth, nose, or both. If there is no exchange of air, the reviver checks the position of the head. If there is still no exchange, the victim should be turned on his side and rapped between the shoulder blades to dislodge any foreign matter that may be blocking the air passages. A child can be held by the ankles and rapped between the shoulder blades. The reviver stops blowing when the chest expands, turns his head away, and listens for exhalation. If the victim is an adult, blowing should be vigorous, at the rate of about 12 breaths per minute. A child's breaths should be shallower, about 20 per minute, and an infant's breaths should come in short puffs. When victims vomit, they must be turned on their side and the airway cleaned before continuing artificial respiration. If the victim has had the larynx removed, the above method is used, but the reviver must breathe into the stoma (surgical opening made in front of neck for breathing). Breathing into the subject should be continued until natural breathing resumes or until professional help arrives. Since the heart often stops beating when breathing is interrupted, cardiopulmonary resuscitation (CPR) is typically administered simultaneously. This entails compressing the chest above the heart at 60 or more thrusts per minute, with two breaths being administered after every 15 chest thrusts. See first aid.


Mosby's Dental Dictionary:

artificial respiration

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n

Maintenance of respiratory movements by artificial R means. When respiration has been arrested and no mechanical device is available, resuscitation by means of artificial respiration is the only practical means of ventilating the lungs.

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categories related to 'artificial respiration'

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  • Procedures - artificial respiration: maintaining airflow in and out of lungs of patient who has stopped breathing, by mouth-to-mouth resuscitation or respirator


Wikipedia on Answers.com:

Artificial respiration

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Artificial respiration
Intervention
ICD-9-CM 93.93
MeSH D012121

Artificial respiration is the act of assisting or stimulating respiration, a metabolic process referring to the overall exchange of gases in the body by pulmonary ventilation, external respiration, and internal respiration.[1] Assistance takes many forms, but generally entails providing air for a person who is not breathing or is not making sufficient respiratory effort on their own[2] (although it must be used on a patient with a beating heart or as part of cardiopulmonary resuscitation to achieve the internal respiration).

Pulmonary anton ventilation (and hence external parts of respiration) is achieved through manual insufflation of the lungs either by the rescuer blowing into the patient's lungs, or by using a mechanical device to do so. This method of insufflation has been proved more effective than methods which involve mechanical manipulation of the patient's chest or arms, such as the Silvester method.[3] It is also known as Expired Air Resuscitation (EAR), Expired Air Ventilation (EAV), mouth-to-mouth resuscitation, rescue breathing or colloquially the kiss of life.

Artificial respiration is a part of most protocols for performing cardiopulmonary resuscitation (CPR)[4][5] making it an essential skill for first aid. In some situations, artificial respiration is also performed separately, for instance in near-drowning and opiate overdoses. The performance of artificial respiration in its own is now limited in most protocols to health professionals, whereas lay first aiders are advised to undertake full CPR in any case where the patient is not breathing sufficiently.

Mechanical ventilation involves the use of a mechanical ventilator to move air in and out of the lungs when an individual is unable to breathe on his or her own, for example during surgery with general anesthesia or when an individual is in a coma.

Contents

History

In 1773, physician William Hawes (1736–1808) began publicising the power of artificial respiration to resuscitate people who superficially appeared to have drowned. For a year he paid a reward out of his own pocket to any one bringing him a body rescued from the water within a reasonable time of immersion. Thomas Cogan, another English physician, who had become interested in the same subject during a stay at Amsterdam, where was instituted in 1767 a society for preservation of life from accidents in water, joined Hawes in his crusade. In the summer of 1774 Hawes and Cogan each brought fifteen friends to a meeting at the Chapter Coffee-house, St Paul's Churchyard, where they founded the Royal Humane Society as a campaigning group for first aid and resuscitation.

Gradually, branches of the Royal Humane Society were set up in other parts of the country, mainly in ports and coastal towns where the risk of drowning was high and by the end of the 19th century the society had upwards of 280 depots throughout the UK, supplied with life-saving apparatus. The earliest of these depots was the Receiving House in Hyde Park, on the north bank of the Serpentine, which was built in 1794 on a site granted by George III. Hyde Park was chosen because tens of thousands of people swam in the Serpentine in the summer and ice-skated in the winter. Boats and boatmen were kept to render aid to bathers, and in the winter ice-men were sent round to the different skating grounds in and around London. The society distributed money-rewards, medals, clasps and testimonials, to those who save or attempt to save drowning people. It further recognized "all cases of exceptional bravery in rescuing or attempting to rescue persons from asphyxia in mines, wells, blasting furnaces, or in sewers where foul gas may endanger life."


Insufflations

Mouth-to-mouth insufflation

Insufflation, also known as 'rescue breaths' or 'ventilations', is the act of mechanically forcing air into a patient's respiratory system. This can be achieved via a number of methods, which will depend on the situation and equipment available. All methods require good airway management to perform, which ensures that the method is effective. These methods include:

  • Mouth to mouth - This involves the rescuer making a seal between their mouth and the patient's mouth and 'blowing', to pass air into the patient's body
  • Mouth to nose - In some instances, the rescuer may need or wish to form a seal with the patient's nose. Typical reasons for this include maxillofacial injuries, performing the procedure in water or the remains of vomit in the mouth
  • Mouth to mouth and nose - Used on infants (usually up to around 1 year old), as this forms the most effective seal
  • Mouth to mask – Most organisations recommend the use of some sort of barrier between rescuer and patient to reduce cross infection risk. One popular type is the 'pocket mask'. This may be able to provide higher tidal volumes than a Bag Valve Mask.[6]
  • Bag valve mask (BVM) - This is a simple device manually operated by the rescuer, which involves squeezing a bag to expel air into the patient.
  • Mechanical resuscitator - An electric unit designed to breathe for patients

Adjuncts to insufflation

A CPR pocket mask, with carrying case

Most training organisations recommend that in any of the methods involving mouth to patient, that a protective barrier is used, to minimise the possibility of cross infection (in either direction).[7]

Barriers available include pocket masks and keyring-sized face shields. These barriers are an example of Personal Protective Equipment to guard the face against splashing, spraying or splattering of blood or other potentially infectious materials.

These barriers should provide a one-way filter valve which lets the air from the rescuer deliver to the patient while any substances from the patient (e.g. vomit, blood) cannot reach the rescuer. Many adjuncts are single use, though if they are multi use, after use of the adjunct, the mask must be cleaned and autoclaved and the filter replaced.

The CPR mask is the preferred method of ventilating a patient when only one rescuer is available. Many feature 18mm inlets to support supplemental oxygen, which increases the oxygen being delivered from the approximate 17% available in the expired air of the rescuer to around 40-50%.

Tracheal intubation is often used for short term mechanical ventilation. A tube is inserted through the nose (nasotracheal intubation) or mouth (orotracheal intubation) and advanced into the trachea. In most cases tubes with inflatable cuffs are used for protection against leakage and aspiration. Intubation with a cuffed tube is thought to provide the best protection against aspiration. Tracheal tubes inevitably cause pain and coughing. Therefore, unless a patient is unconscious or anesthetized for other reasons, sedative drugs are usually given to provide tolerance of the tube. Other disadvantages of tracheal intubation include damage to the mucosal lining of the nasopharynx or oropharynx and subglottic stenosis.

In an emergency a Cricothyrotomy can be used by health care professionals, where an airway is inserted through a surgical opening in the cricothyroid membrane. This is similar to a tracheostomy but a cricothyrotomy is reserved for emergency access. This is usually only used when there is a complete blockage of the pharynx or there is massive maxillofacial injury, preventing other adjuncts being used.[8]

Efficiency of mouth to patient insufflation

Normal atmospheric air contains approximately 21% oxygen when inhaled in. After gaseous exchange has taken place in the lungs, with waste products (notably carbon dioxide) moved from the bloodstream to the lungs, the air being exhaled by humans normally contains around 17% oxygen. This means that the human body utilises only around 19% of the oxygen inhaled, leaving over 80% of the oxygen available in the exhalatory breath.[9]

This means that there is more than enough residual oxygen to be used in the lungs of the patient, which then crosses the cell membrane to form oxyhemoglobin.

Oxygen

Typical view of resuscitation in progress with a BVM in use

The efficiency of artificial respiration can be greatly increased by the simultaneous use of oxygen therapy. The amount of oxygen available to the patient in mouth to mouth is around 16%. If this is done through a pocket mask with an oxygen flow, this increases to 40% oxygen. If a Bag Valve Mask or mechanical respirator is used with an oxygen supply, this rises to 99% oxygen. The greater the oxygen concentration, the more efficient the gaseous exchange will be in the lungs.

See also

References

  1. ^ Tortora, Gerard J; Derrickson, Bryan (2006). Principles of Anatomy and Physiology. John Wiley & Sons Inc..
  2. ^ "Artificial Respiration". Encyclopaedia Britannica. Archived from the original on 14 June 2007. http://www.britannica.com/eb/article-9009713/artificial-respiration. Retrieved 2007-06-15.
  3. ^ "Artificial Respiration". Microsoft Encarta Online Encyclopedia 2007. Archived from the original on 2009-10-31. http://www.webcitation.org/5kwKiCVG5. Retrieved 2007-06-15.
  4. ^ "Decisions about cardiopulmonary resuscitation model information leafler". British Medical Association. July 2002. http://www.bma.org.uk/ap.nsf/Content/cprleaflet. Retrieved 2007-06-15.
  5. ^ "Overview of CPR". American Heart Association. 2005. Archived from the original on 27 June 2007. http://circ.ahajournals.org/cgi/content/full/112/24_suppl/IV-12. Retrieved 2007-06-15.
  6. ^ Dworkin, Gerald M (Winter 1987). "Mouth to Mouth rescue breathing and comparisons of personal resuscitation masks". Rescue Squad Quarterly. Archived from the original on 2007-06-02. http://web.archive.org/web/20070602124950/http://lifesaving.com/issues/articles/30mouth_to_mouth.html. Retrieved 2007-06-15.
  7. ^ "Emergency Cardiovascular Care Revisions for the professional rescuer" (DOC). American Red Cross. http://www.redcross.org/services/hss/resources/eccpr.doc. Retrieved 2007-06-15.
  8. ^ Carley SD, Gwinnutt C, Butler J, Sammy I, Driscoll P. (March 2002). "Rapid sequence induction in the emergency department: a strategy for failure". Emergency Medicine Journal 19 (2): 109–113. doi:10.1136/emj.19.2.109. PMC 1725832. PMID 11904254. http://emj.bmjjournals.com/cgi/content/full/19/2/109. Retrieved 2007-05-19.
  9. ^ "Physical Intervention: Life Support (Rescue Breathing)". Archived from the original on 25 January 2006. http://www.doitnow.org/pages/208/208-5.html. Retrieved December 29, 2005.

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