Altitude sickness: Difference between revisions

Jump to navigation Jump to search
No edit summary
 
(23 intermediate revisions by 7 users not shown)
Line 1: Line 1:
'''For patient information click [[{{PAGENAME}} (patient information)|here]]'''
__NOTOC__
{{Infobox_Disease |
'''For patient information, click [[{{PAGENAME}} (patient information)|here]]'''
  Name          = Altitude sickness |
  Image          = |
  Caption        = |
  DiseasesDB    = 8375 |
  DiseasesDB_mult = {{DiseasesDB2|29615}} |
  ICD10          = {{ICD10|T|70|2|t|66}} |
  ICD9          = {{ICD9|E902.0}} |
  ICDO          = |
  OMIM          = |
  MedlinePlus    = |
  eMedicineSubj  = |
  eMedicineTopic = |
  MeshID        = D000532 |
}}
{{Altitude sickness}}
{{Altitude sickness}}
{{CMG}}
{{CMG}}


==Overview==
{{SK}} Acute altitude sickness; acute mountain sickness; acosta syndrome; chronic altitude sickness; monge disease; chronic mountain sickness; high altitude cerebral edema; HACE; high altitude pulmonary edema; HAPE; high altitude flatus expulsion; HAFE
'''Altitude sickness''', also known as '''acute mountain sickness''' ('''AMS''') or '''altitude illness''' is a pathological condition that is caused by acute exposure to low air pressure (usually outdoors on high altitudes). It commonly occurs above 2,400 metres (approximately 8,000 feet)<ref>{{cite web | author=K Baillie and A Simpson  | title=Acute mountain sickness| url=http://www.altitude.org/calculators/altitudefacts/altitudefacts.htm | publisher=Apex (Altitude Physiology Expeditions) | accessdate=2007-08-08}} - High altitude information for laypeople</ref>. Acute mountain sickness can progress to [[high altitude pulmonary edema]] (HAPE) or [[high altitude cerebral edema]] (HACE).<ref>{{cite web | author=AAR Thompson  | title=Altitude-Sickness.org| url=http://www.altitude-sickness.org| publisher=Apex  | accessdate=2007-05-08}}</ref> Altitude sickness does not typically affect persons traveling in aircraft, as the cabins of modern airplanes are pressurized. Another rarer type of altitude sickness caused by prolonged exposure to high altitude is [[chronic mountain sickness]], also known as Monge's disease.


==Introduction==
==[[Altitude sickness overview|Overview]]==
Generally, different people have different susceptibilities to altitude sickness. For some otherwise healthy people Acute mountain sickness (AMS) can begin to appear at around 2000 meters (6,500 feet) above sea level such as at many mountain ski resorts. AMS is the most frequent type of altitude sickness encountered. Symptoms often manifest themselves 6 to 10 hours after ascent and generally subside in 1 to 2 days, but they occasionally develop into the more serious conditions. Symptoms are described as headache with fatigue, stomach sickness, dizziness, and sleep disturbance as additional possible symptoms. Exertion aggravates the symptoms.
==[[Altitude sickness historical perspective|Historical Perspective]]==
==[[Altitude sickness classification|Classification]]==
==[[Altitude sickness pathophysiology|Pathophysiology]]==
==[[Altitude sickness causes|Causes]]==
==[[Altitude sickness differential diagnosis|Differentiating Altitude Sickness from other Diseases]]==


[[High altitude pulmonary edema]] ([[HAPE]]) and cerebral edema ([[HACE]]) are the most ominous of these symptoms, while acute mountain sickness, retinal haemorrhages, and peripheral edema are the less severe forms of the disease. The rate of ascent, the altitude attained, the amount of physical activity at high altitude, as well as individual susceptibility, are contributing factors to the incidence and severity of high-altitude illness.
==[[Altitude sickness epidemiology and demographics|Epidemiology and Demographics]]==
==[[Altitude sickness risk factors|Risk Factors]]==
==[[Altitude sickness screening|Screening]]==
==[[Altitude sickness natural history, complications and prognosis|Natural History, Complications, and Prognosis]]==


Altitude sickness usually occurs following a rapid ascent and can usually be prevented by ascending slowly <ref>http://www.high-altitude.org</ref>. In most of these cases, the symptoms are only temporary and usually abate with time as altitude acclimatisation occurs. However, in more extreme cases symptoms can be fatal.
==Diagnosis==
[[Altitude sickness diagnostic study of choice|Diagnostic Study of Choice]] | [[Altitude sickness history and symptoms|History and Symptoms]] | [[Altitude sickness physical examination|Physical Examination]] | [[Altitude sickness laboratory findings|Laboratory Findings]] | [[Altitude sickness chest x ray|Chest X Ray]] | [[Altitude sickness CT|CT]] | [[Altitude sickness MRI|MRI]] | [[Altitude sickness other imaging findings|Other Imaging Findings]] | [[Altitude sickness other diagnostic studies|Other Diagnostic Studies]]


==Signs and symptoms==
==Treatment==
[[Image:Altitude sickness warning.jpg|thumb|left|275px|This sign near the peak of Mount Evans (elev. 14264 ft or 4,350 metres) in Colorado warns of altitude sickness symptoms.]]
[[Altitude sickness medical therapy|Medical Therapy]] | [[Altitude sickness surgery|surgery]] | [[Altitude sickness primary prevention|Primary Prevention]] | [[Altitude sickness secondary prevention|Secondary Prevention]] | [[Altitude sickness cost-effectiveness of therapy|Cost-Effectiveness of Therapy]] | [[Altitude sickness future or investigational therapies|Future or Investigational Therapies]]
[[Headache]] is a primary symptom used to diagnose altitude sickness, although headache is also a symptom of [[dehydration]]. A headache occurring at an altitude above 2,400 meters (8000 feet = 76 kPa), combined with any one or more of the following symptoms, can indicate altitude sickness:
* Lack of appetite, [[nausea]], or vomiting
* [[Fatigue (physical)|Fatigue]] or weakness
* [[Dizziness]] or [[lightheadedness|light-headedness]]
* [[Insomnia]]
* Pins and needles
* Shortness of breath upon exertion
* Persistent rapid pulse
* Drowsiness
* General [[malaise]]
* [[Peripheral edema]] (swelling of hands, feet, and face). 


Symptoms that may indicate life-threatening altitude sickness include:
==Case Studies==
* [[pulmonary edema]] (fluid in the lungs):
[[Altitude sickness case study one|Case #1]]
** persistent dry cough
** fever
** shortness of breath even when resting
* [[cerebral edema]] (swelling of the brain):
** headache that does not respond to analgesics
** unsteady gait
** increased vomiting
** gradual loss of consciousness.
 
== Severe cases ==
The most serious symptoms of altitude sickness are due to [[edema]] (fluid accumulation in the tissues of the body). At very high altitude, humans can get either [[high altitude pulmonary edema]] (HAPE), or [[high altitude cerebral edema]] (HACE). DIARYfatal. The physiological cause of altitude-induced edema is not conclusively established. It is currently believed, however, that HACE is caused by local vasodilation of cerebral blood vessels in response to hypoxia, resulting in greater blood flow and, consequently, greater capillary pressures. On the other hand, HAPE may be due to general vasoconstriction in the pulmonary circulation (normally a response to regional ventilation-perfusion mismatches) which, with constant or increased cardiac output, also leads to increases in capillary pressures. For those suffering HACE, [[dexamethasone]] may provide temporary relief from symptoms in order to keep descending under their own power.
 
HAPE occurs in ~2% of those who are adjusting to altitudes of ~3000 m (10,000 feet) or more. It can progress rapidly and is often fatal.  Symptoms include fatigue, severe [[dyspnea]] at rest, and cough that is initially dry but may progress to produce pink, frothy [[sputum]]. Descent to lower altitudes alleviates the symptoms of HAPE.
 
HACE is a life threatening condition that can lead to coma or death.  It occurs in about 1% of people adjusting to altitudes above ~2700 m (9,000 feet).  Symptoms include headache, fatigue, visual impairment, bladder dysfunction, bowel dysfunction, loss of coordination, paralysis on one side of the body, and confusion. Descent to lower altitudes may save those afflicted with HACE.
 
==Prevention==
===Avoiding alcohol ingestion===
As alcohol tends to dehydrate, avoidance in the first 24 hours at a higher altitude is optimal.
 
===Strenous activity===
People with recurrent AMS note that by avoiding strenuous activity such as skiing, hiking, etc in the first 24 hours at altitude reduces their problems.
 
=== Altitude acclimatization===
Altitude acclimatisation is the process of adjusting to decreasing [[oxygen]] levels at higher elevations, in order to avoid altitude sickness. Once above approximately 3,000 metres (10,000 feet), most climbers and high altitude trekkers follow the "golden rule" - climb high, sleep low. For high altitude climbers, a typical acclimatisation regime might be to stay a few days at a base camp, climb up to a higher camp (slowly), then return to base camp. A subsequent climb to the higher camp would then include an overnight stay. This process is then repeated a few times, each time extending the time spent at higher altitudes to let the body "get used" to the oxygen level there, a process that involves the production of additional [[red blood cells]]. Once the climber has acclimatised to a given altitude, the process is repeated with camps placed at progressively higher elevations. The general rule of thumb is to not ascend more than 300 metres (1,000 feet) per day to sleep. That is, one can climb from 3,000 (10,000 feet) to 4,500 metres (15,000 feet) in one day, but one should then descend back to 3,300 metres (11,000 feet) to sleep. This process cannot safely be rushed, and this explains why climbers need to spend days (or even weeks at times) acclimatising before attempting to climb a high peak. Simulated altitude equipment that produce hypoxic (reduced oxygen) air can be used to acclimate to altitude, reducing the total time required on the mountain itself.
 
Patients can sometimes control mild altitude sickness by consciously taking ten to twelve large, rapid breaths every five minutes. If overdone, this can remove too much carbon dioxide and cause tingling in the extremities of the body. Other treatments include injectable [[steroids]] to reduce pulmonary edema, and inflatable pressure vessels to relieve and evacuate severe mountain-sick persons.
 
The only real cure once symptoms appear is for the sufferer to move to a lower altitude as quickly as possible. For serious cases of AMS, a Gamow bag can be used to reduce the effective altitude by as much as 1,500 meters (5,000 feet). A Gamow bag is a portable plastic pressure bag inflated with a foot pump.
 
In Peru hotels on the shore of Lake Titicaca at 3,812 m (12,507 feet) offer oxygenated bedrooms at a premium charge. The same is true at the Monasterio hotel in Cuzco at the lower elevation of 3,500 m (11,500 feet)<ref>www.monasterio.orient-express.com</ref>. The folk remedy for altitude sickness in Peru and Bolivia is a tea made from the coca plant.
 
Altitude acclimatization is necessary for some people who rapidly move from lower altitudes to more moderate altitudes, usually by aircraft and ground transportation over a few hours,  such as from sea level to 7000 feet of many Colorado, USA mountain resorts. Stopping at an intermediate altitude overnight can reduce or eliminate a repeat episode of AMS.
 
===Drugs===
[[Acetazolamide]] may help some people to speed up the acclimatisation process when taken before arriving at altitude, and can treat mild cases of altitude sickness. A typical dose is 250mg twice daily starting the day before moving to altitude.
 
A single [[randomized controlled trial]] found that [[sumatriptan]] may help prevent altitude sickness.<ref name="pmid17557349">{{cite journal |author=Jafarian S, Gorouhi F, Salimi S, Lotfi J |title=Sumatriptan for prevention of acute mountain sickness: randomized clinical trial |journal=Ann. Neurol. |volume=62 |issue=3 |pages=273–7 |year=2007 |pmid=17557349 |doi=10.1002/ana.21162}}</ref>
 
For centuries, indigenous cultures of the Altiplano, such as the Aymaras, have used coca leaves to treat mild altitude sickness.
 
=== Oxygen enrichment ===
In high-altitude conditions, oxygen enrichment can counteract the effects of altitude sickness, or [[hypoxia (medical)|hypoxia]]. A small amount of supplemental oxygen reduces the equivalent altitude in climate-controlled rooms. At 3,400 m (67 kPa), raising the oxygen concentration level by 5 percent via an oxygen concentrator and an existing ventilation system provides an effective altitude of 3,000 m (70 kPa), which is more tolerable for surface-dwellers.<ref>West, John B. (1995), "Oxygen Enrichment of Room Air to Relieve the Hypoxia of High Altitude", ''Respiration Physiology'' 99(2):230.</ref>
 
One of the effective source of supplemental oxygen at high altitude are oxygen concentrators that use vacuum swing adsorption (VSA) technology. As opposed to generators that use [[pressure swing adsorption]] (PSA), VSA technology does not suffer from performance degradation at increased altitude. The lower air density actually facilitates the vacuum step process.
 
===Other methods===
Drinking plenty of water will also help in acclimatisation<ref name="dannen">{{cite book
  | last = Dannen
  | first = Kent
  | authorlink =
  | coauthors = Dannen, Donna
  | title = Rocky Mountain National Park
  | publisher = Globe Pequot
  | year = 2002
  | location =
  | pages = 9
  | url = http://books.google.com/books?id=txzevi145t8C&pg=PA9&dq=%22drinking+plenty+of+water%22+%22altitude+sickness%22&sig=S8HVuMeBMouac2Ag9vL9Kd-41gc
  | isbn = 0762722452
  | quote = Visitors unaccustomed to high elevations may experience symptoms of Acute Mountain Sickness (AMS)[...s]uggestions for alleviating symptoms include drinking plenty of water[.]}}</ref> to replace the fluids lost through heavier breathing in the thin, dry air found at altitude, although consuming excessive quantities ("over-hydration") has no benefits and may lead to [[hyponatremia]].
 
Oxygen from gas bottles or liquid containers can be applied directly via a nasal cannula or mask. Oxygen concentrators based upon PSA, VSA, or [[VPSA]] can be used to generate the oxygen if electricity is available.  Stationary oxygen concentrators typically use PSA technology, which has performance degradations at the lower barometric pressures at high altitudes. One way to compensate for the performance degradation is to utilize a concentrator with more flow capacity. There are also portable oxygen concentrators that can be used on vehicle DC power or on internal batteries, and at least one system commercially available measures and compensates for the altitude effect on its performance up to 4,000 meters (13,123 feet). The application of high-purity oxygen from one of these methods increases the partial pressure of oxygen by raising the FIO2 (fraction of inspired oxygen).
 
==References==
{{reflist|2}}


==Related Chapters==
==Related Chapters==
* Secondary [[Polycythemia]]
* Secondary [[Polycythemia]]
* [[Altitude training]]
* [[Altitude training|Altitude Training]]
* [[High Altitude Pulmonary Edema]]
* [[Pulmonary Edema]]
* [[High altitude cerebral edema]]
* [[International HAPE database|International HAPE Database]]


{{Consequences of external causes}}
{{Consequences of external causes}}
[[Category:Disease state]]
[[Category:Mountaineering]]
[[Category:Emergency medicine]]
[[Category:Pulmonology]]
[[Category:Neurology]]
[[Category:Overview complete]]
[[es:Mal de montaña]]
[[es:Mal de montaña]]
[[fr:Mal aigu des montagnes]]
[[fr:Mal aigu des montagnes]]
Line 134: Line 43:
{{WikiDoc Help Menu}}
{{WikiDoc Help Menu}}
{{WikiDoc Sources}}
{{WikiDoc Sources}}
[[Category:Emergency medicine]]
[[Category:Pulmonology]]
[[Category:Neurology]]

Latest revision as of 20:09, 4 April 2018

For patient information, click here

Altitude sickness Microchapters

Home

Patient Information

Overview

Historical Perspective

Classification

Pathophysiology

Causes

Differentiating Altitude Sickness from other Diseases

Epidemiology and Demographics

Risk Factors

Screening

Natural History, Complications and Prognosis

Diagnosis

Diagnostic study of Choice

History and Symptoms

Physical Examination

Laboratory Findings

Electrocardiogram

X-ray

Echocardiography and Ultrasound

CT

MRI

Other Imaging Findings

Other Diagnostic Studies

Treatment

Medical Therapy

Surgery

Primary Prevention

Secondary Prevention

Cost-Effectiveness of Therapy

Future or Investigational Therapies

Case Studies

Case #1

Altitude sickness On the Web

Most recent articles

Most cited articles

Review articles

CME Programs

Powerpoint slides

Images

American Roentgen Ray Society Images of Altitude sickness

All Images
X-rays
Echo & Ultrasound
CT Images
MRI

Ongoing Trials at Clinical Trials.gov

US National Guidelines Clearinghouse

NICE Guidance

FDA on Altitude sickness

CDC on Altitude sickness

Altitude sickness in the news

Blogs on Altitude sickness

Directions to Hospitals Treating Altitude sickness

Risk calculators and risk factors for Altitude sickness

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: Acute altitude sickness; acute mountain sickness; acosta syndrome; chronic altitude sickness; monge disease; chronic mountain sickness; high altitude cerebral edema; HACE; high altitude pulmonary edema; HAPE; high altitude flatus expulsion; HAFE

Overview

Historical Perspective

Classification

Pathophysiology

Causes

Differentiating Altitude Sickness from other Diseases

Epidemiology and Demographics

Risk Factors

Screening

Natural History, Complications, and Prognosis

Diagnosis

Diagnostic Study of Choice | History and Symptoms | Physical Examination | Laboratory Findings | Chest X Ray | CT | MRI | Other Imaging Findings | Other Diagnostic Studies

Treatment

Medical Therapy | surgery | Primary Prevention | Secondary Prevention | Cost-Effectiveness of Therapy | Future or Investigational Therapies

Case Studies

Case #1

Related Chapters

Template:Consequences of external causes


Template:WikiDoc Sources