by Dr. Iain Corness
Flying with a DVT
As you know, we medicos love acronyms,
so let’s clear up this new acronym first. DVT stands for Deep Venous
Thrombosis, which describes blood clots, generally in your lower legs. And
secondly, you don’t have to fly to get a DVT - you can get it on the ground.
Now everyone in the world, other than a few farmers in outer Mongolia, has
heard of the “Economy Class Syndrome”, in which you end up getting blood
clots in the legs from being squeezed into seat 176A at the rear of the
Economy section of Plummet Airlines. The rationale is that after sitting in
176A for the 12 hour flight to bring the bad news to Outer Mongolia, the
blood flow in the legs slows so much that clotting forms and you end up with
the acronym, called a DVT, or more correctly Deep Vein Thrombosis, or even
Deep Venous Thrombosis. This has produced a group of nervous airline
passengers, cowering in fear, waiting for hijacking or DVTs. Those who can
afford it, upgrade to Business class and sit there drinking G&T’s feeling
totally pampered and safe from DVT. Unfortunately, you can get a DVT while
sitting with the aforementioned G&T in seat 12A as well.
However, there are many other ways of getting your DVT, and you don’t have
to buy an expensive ticket, plus fuel surcharge to get one. You can get one
sitting in front of your work computer. Dear me, your computer is now a
Backing up this contentious claim is one of the world’s respected medical
publications, the New Zealand Medical Journal, with the results tabled at
the annual conference of the Thoracic Society of Australia and New Zealand.
Professor Richard Beasley of the Medical Research Institute in New Zealand
studied patients admitted to hospital with DVTs and found that only 21
percent had traveled on long distance flights, whilst 34 percent were
sedentary office workers who would sit in front of their computer screen for
three to four hours at a stretch without getting up, and do this for up to
14 hours a day. This showed two factors. Firstly their work habit was
dangerous, allowing the blood to pool up in their legs, and secondly, they
had magnificent bladder control.
Whilst I was joking about the bladder control, I would postulate that to be
able to sit for four hours at a time, these office workers were not drinking
enough fluid, leading to thickening of the blood, and even more likelihood
of blood clots. Look around your office, how many of the staff have a water
jug, or even a glass of water on their work station?
That’s enough on the factors leading to DVT, what can a DVT do? What happens
is very understandable. The clot breaks off from the deep vein and then
travels upwards towards the heart. In doing so, it will go from major, large
diameter blood vessels into smaller and smaller again. Eventually, depending
upon the size, the clot will become wedged in a very small vessel and shut
off the blood supply to that area.
If the blockage occurs in the lung, the condition is called a Pulmonary
Embolism (PE). This is potentially fatal. PE causes or contributes to up to
200,000 deaths annually in the United States. One in every 100 patients who
develop DVT die due to pulmonary embolism.
There is some good news in all this, if pulmonary embolism can be diagnosed
early and appropriate therapy started, the mortality can be reduced from
approximately 30 percent to less than 10 percent.
Still, 10 percent is a little too high for my liking. So what can you do to
prevent getting a DVT? Apart from the obvious maintenance of good health
with sensible eating and drinking and regular check-ups, the important
preventive factors include getting up and walking around at least every hour
(both in the office and from seat 176A), drinking plenty of water and taking
100 mg of aspirin every day. By making it less likely that a clot can form,
you remove the dangers of DVT.
Go and get a glass of water now! And use it to swallow your aspirin.