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Air Travel
Pleasure or Peril?
Thomas Songer
Learning Objectives
• To introduce the possible health risks
associated with air travel in the short-
and long-term.
• To understand the primary issues related
to deep vein thrombosis and air travel.
• To identify the study design issues
underlying research on the health effects
of exposure to cosmic radiation.
“Fasten your seat belts - it could be a
sickly ride” .. Mail on Sunday July 2000
“Long flights cost 2000 lives a year”
..Telegraph Jan 2001
“Flying can prove fatal in economy
class” ..Independent on Sunday May 2000
“Long haul passengers pass out from
oxygen shortage” ..Sunday Times 5/2000
Health vs. Safety
What health risks are
associated with air travel?
Potential Health Risks
• From Acute Exposures
–Deep Vein Thrombosis
–Infection
–Injury
–Adverse events in the
medically vulnerable
Deep Vein Thrombosis
• a thrombus (blood clot) within a
deep vein, commonly in the
thigh or calf
• may develop in a narrowed or
blocked vein, which allows the
blood to clot
• the most serious complication
of DVT is a pulmonary
Deep Vein Thrombosis
• Can be brought on by
–an injury to the vein, or following
surgery
–poor circulation from inactivity
–pregnancy
–severe infection
–liver disease
Deep Vein Thrombosis
• Symptoms
–tenderness/redness in affected area
–pain & swelling in affected area
–fever
–rapid heart beat
–joint pain and soreness
Risk Factors for DVT
• Increasing Age (above 40 years)
• Pregnancy
• Previous or Family history of DVT
• Clotting disorders
• Recent major surgery
• Estrogen hormone therapy & OCs
• Immobility
• Gender

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Presentation2

  • 1. Air Travel Pleasure or Peril? Thomas Songer
  • 2. Learning Objectives • To introduce the possible health risks associated with air travel in the short- and long-term. • To understand the primary issues related to deep vein thrombosis and air travel. • To identify the study design issues underlying research on the health effects of exposure to cosmic radiation.
  • 3. “Fasten your seat belts - it could be a sickly ride” .. Mail on Sunday July 2000 “Long flights cost 2000 lives a year” ..Telegraph Jan 2001 “Flying can prove fatal in economy class” ..Independent on Sunday May 2000 “Long haul passengers pass out from oxygen shortage” ..Sunday Times 5/2000
  • 5. What health risks are associated with air travel?
  • 6. Potential Health Risks • From Acute Exposures –Deep Vein Thrombosis –Infection –Injury –Adverse events in the medically vulnerable
  • 7. Deep Vein Thrombosis • a thrombus (blood clot) within a deep vein, commonly in the thigh or calf • may develop in a narrowed or blocked vein, which allows the blood to clot • the most serious complication of DVT is a pulmonary
  • 8. Deep Vein Thrombosis • Can be brought on by –an injury to the vein, or following surgery –poor circulation from inactivity –pregnancy –severe infection –liver disease
  • 9. Deep Vein Thrombosis • Symptoms –tenderness/redness in affected area –pain & swelling in affected area –fever –rapid heart beat –joint pain and soreness
  • 10. Risk Factors for DVT • Increasing Age (above 40 years) • Pregnancy • Previous or Family history of DVT • Clotting disorders • Recent major surgery • Estrogen hormone therapy & OCs • Immobility • Gender

Notas do Editor

  1. Air travel is an exotic endeavor. Advertisements often promote the appeal of travelling to a different location for a holiday. With the advent of low airfares in the 1980s, more and more individuals have taken the opportunity to see parts of the world that were previously out of reach. Recent events and their promotion in the newspapers, though, raise the possibility that individuals may be at some harm from air travel. Several case reports exist, for example, that note a medical emergency occurring during a flight. What are the health risks associated with air travel? This lecture discusses the current understanding regarding these risks. The author, Thomas Songer, is an assistant professor in the Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh. He is a member of the Center for Injury Research and Control at the University of Pittsburgh and is an irregular airline flyer. Related Internet Links: -Air Travel and Health. House of Lords, Select Committee on Science and Technology Fifth Report. (http://www.parliament.the-stationery-office.co.uk/pa/ld199900/ldselect/ldsctech/121/12101.htm) -Health Physics; November 2000 issue, abstracts online (http://www.health-physics.com/) -CDC links on Air Travel and Health (http://www.cdc.gov/travel/cruiships.htm)
  2. This lecture originated from a serious of newspaper headlines in the British newspapers. If you are a fan of these newspapers, then you might recall the headlines illustrated here; all of which were published within a very short period of time. What is your reaction after reading these accounts? Perhaps, you might be a little more leery of flying. Perhaps, you were unaware of health events related to flying. Have the papers portrayed the correct message? The fact is that we currently have a limited understanding of the size of health risk related to air travel.
  3. There are two issues of relevance in the discussion of the potential risks of air travel; the association between health and air travel and that between safety and air travel. This lecture will detail the current discussions regarding health and air travel. A second lecture regarding safety is available on the Epidemiology Supercourse web site. See: Air Safety and Terrorism (http://www.pitt.edu/~super1/lecture/lec4811/index.htm)
  4. Several short-term health effects of air travel are postulated in the literature. These include the recent events publicized regarding deep vein thrombosis on long haul flights, concern over the transmission of infectious agents in cabin air, foodbourne outbreaks on aircraft, injuries from failing luggage in overhead bins, and the onset of disease endpoints in persons with pre-existing disease. One common example is the development of acute myocardial infarctions (thought to be brought on by the environment of the airliner). There recently has been some concern over the transmission of tuberculosis from an infected passenger to others on the airplane, or the spread of tuberculosis from endemic areas due to the increased availability of air travel throughout the world. Case reports of infectious individuals traveling on planes and exposing passengers to TB are published. A recent review, though, suggests that transmission to other passengers is not always certain, and no case of active TB has been thought to result from exposure while in air travel. See: WHO, Tuberculosis and Air Travel: Guidelines for Prevention and Control. (http://www.who.int/gtb/publications/aircraft/contents.html)
  5. The health effect of most recent concern, though, is the development of a deep vein thrombosis (a blood clot in a deep vein of the thigh or calf) after long flights. Deep vein thrombosis is a common medical condition in the general population. It can be caused by a narrowed or blocked vein which increases the risk for clotting. The complication of urgent concern with deep vein thrombosis is the onset of a pulmonary embolism, brought on by the blot clot traveling from the leg vein to the lung (where it subsequently blocks an artery). Many of the recent deaths from air travel have been through a pulmonary embolus. See: Deep Vein Thrombosis. British United Provident Association (BUPA). (http://hcd2.bupa.co.uk/fact_sheets/mosby_factsheets/Deep_Vein_Thrombosis.html)
  6. Known factors or characteristics that may lead to the development of a deep vein thrombosis are an injury to the leg, recent surgery, poor circulation, pregnancy, infections liver disease and some cancers. Source: BUPA
  7. Typical symptoms of deep vein thrombosis are shown here.
  8. One recent study of DVT in non-hospitalized patients found several potential risk factors, including increasing age (higher in the elderly), recent surgery, more than 3 pregnancies, previous DVT, and estrogen use (either as hormone replacement therapy or as oral contraceptives). Immobility has also be hypothesized as a leading factor for the development of clots. See: Meyer-Michel Samama, MD(BiolPharm); for the Sirius Study Group Arch Intern Med. 2000;160:3415-3420