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.

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Presentation transcript:

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 embolism

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

Economy Class Syndrome??

DVT and Long Haul Travel Increasing Age Increasing Duration of Travel Immobility Seating Constraints and Posture Cabin Environment (low humidity) Excessive alcohol and/or caffeine Obesity? Height?

Changing Demographics of Air Travel Aircraft seats designed for persons who average 5’7’’ and 170 lbs. More vulnerable passengers are now able to fly from an economic perspective Projected increase in air travel

Airline Seat Pitch inches Skytrax

AirlineSeat pitch Air France31 British Airways31 American Airlines33 Lufthansa31 Northwest/KLM31 Swissair32 United31

Recent DVT episodes -a 42 year old woman died following a 9 hour flight from SF to London. She was seated in business class. -a 45 year old CEO suffered a DVT on a flight from NY to Geneva. He was seated in first class.

Epidemiology of DVT from Air Travel

Travel as a risk factor for venous thromboembolic disease VTEDControlp-value Age (years) n.s. Hypertension (%) n.s Sex (% male) VTED history (%) Obesity (%) Recent travel (%) <0.001 Ferrari 1999

Travel and risk of venous thrombosis CasesControls Plane Travel 4% 13% Kraaijenhagen 2000 Odds Ratio 1.0 ( )

Current Knowledge The link between air travel and DVT is not clear “There is a link between flying and the development of blood clots, but I think the problem is still quite small, and that it is a relatively small number of passengers who are at risk” John Scurr

Potential Health Risks From Chronic Exposures –cancers/leukemia from cosmic radiation cabin air exposures

Cosmic Radiation Altitude Latitude Solar Activity Doses are affected by …. Kendall 2000

Atmospheric depthsAircraft heights (km) (g cm -2 ) Tibet (3.7 km) Commercial (10 km) Private jet (15 km) SST (18-20 km)

Radiation Exposure in Flight Seattle Tokyo Flight time (hours) dose (Grays/min) cumulative dose equiv. (uSv) 2E-08 4E-08 6E-08 8E-08 1E ,000 ft.35-36,000 ft.

Annual Dose Air Crew mSv General Population 1.1 mSv Waters 2000

Leukemia/Cancer in Cockpit Crew Danish cockpit crew members known to aviation medicine clinic (1946-present) Flight hours, aircraft, certification data gathered Danish Cancer Registry National Death Index

Leukemia/Cancer in Cockpit Crew Cancer 5000 Leukemia AML CLL Melanoma Other Skin Standardised Incidence Ratios Gundestrup 1999

The short-term and long-term health hazards of air travel are of interest There is little scientific evidence to quantify the association between air travel and DVT There is inconsistent evidence of a link between cancer and cosmic radiation The information reviewed suggests that..