Intense training can be a risk in travel-related DVT

In hospitals, deep vein thrombosis (DVT) may occur after surgery, especially surgery below the waist, like hip surgery. And it’s true that you should avoid surgery for at least 30 days after air travel if possible.  But the risk factors for DVT on an airplane are very different from those in a hospital, and include recent intense athletic conditioning, particularly training for endurance sports like marathons.

According to Airhealth, the most common travel-related risk factors for DVT are:

1. Athletic training, especially training for endurance sports like marathons.

2. Recent surgery or injury. If you have just run a marathon, you probably have at least minor bruising that can trigger clotting. Kick-boxing also produces such injuries.

3. Personal or family history of DVT.

4. Cancer, heart disease, diabetes. Obesity is often cited as a risk factor, but probably ranks much lower than the preceding diseases.

5. Women who are pregnant or taking estrogen as birth control or hormone replacement.

6. Age over 40 is often cited as a risk factor; sometime age over 60 is cited. Butin Airhealth’s registry, over 80% of those suffering DVT while traveling are under age 60, and the majority are under 50.

See also How to avoid blot clots while traveling.

They're squeezing more and more passengers into coach these days. Photo from blisstree.com

Take heart, obsessive travelers: according to the Centers for Disease Control (CDC), more than 63 million Americans travel abroad each year, and the great majority of them never have any major problems.

Still, we need to pay attention to the risks of travel. A study released yesterday by doctors at Harvard University found that travel is associated with a 3-fold higher risk for blood clots, called deep vein thrombosis (DVT), with the risk increasing for each 2-hour increase in travel time.

The clots, which often form in the deep veins of the legs, may occasionally break loose and head for the heart or lungs, which may lead to heart failure or stroke (which may, in turn, lead to death). Lots of “maybes” in that chain of events, but still, we need to pay attention.

Any type of travel where you sit still for long periods can be potential dangerous, but flying seems to be especially problematic. It’s harder to get up and move around on a plane, your legs are often stuffed into a woefully small space (in fact, DVT is often called “economy class syndrome.”) And the air in planes is also very dry, raising the risk of dehydration.

Scary, to be sure. But the CDC offers some simple but effective steps to minimize your risk.

While traveling

1. When sitting for long periods of time, such as when traveling for more than four hours:

• Get up and walk around every 2 to 3 hours.
• Wear loose-fitting clothes.
• Drink plenty of water, and avoid drinking anything with alcohol or caffeine in it.

2. Exercise your legs while you’re sitting by:

• Raising and lowering your heels while keeping your toes on the floor
• Raising and lowering your toes while keeping your heels on the floor
• Tightening and releasing your leg muscles

Lifestyle changes that help you avoid DVT:

• Exercise regularly
• Maintain a healthy weight
• Don’t smoke
• If you have a family history of DVT, talk to your doctor about medication (anticoagulants) to prevent or treat DVT

At Airhealth.org you can download a handy wallet card that reminds you of how to avoid DVT.