In
the wake of the tragic passing of actress Natasha Richardson, I'd like to share
a few details that everyone should know about head injuries and when to seek medical
attention for one.
Based
on what I've read in several newspaper reports, Natasha Richardson died from an
epidural hematoma, which medical professionals will tell you is one of the most
frightening conditions around because it can be caused by a low force blow to
the head, and also because initially, there may be no signs to indicate that a
serious injury has occurred.
Understanding Epidural Hematomas
Your
brain is surrounded by three thin layers of connective tissue that are collectively
called your meninges. The outermost meningeal layer is called dura mater, and
the thin space between your dura mater and the bones that make up your skull is
called your epidural space.
Along
the sides of your head in the area around your temples, your epidural space houses
an artery called your middle meningeal artery, whose job is to provide steady
blood supply to your meninges. The portion of skull that protects this area is
quite thin and weak compared to the rest of your skull. This is why even a low
force blow to this area could lead to a fracture and tearing of your middle meningeal
artery.
If
your middle meningeal artery was torn or lacerated, blood could quickly begin
to pool in your epidural space. Because your heart would continue to send blood
to the area and this blood wouldn't be drained by your veins, the net effect of
a torn middle meningeal artery would be increased pressure on your brain tissues,
which could lead to death of brain cells from oxygen deprivation. Symptoms
and Common Causes of Epidural Hematomas
About
50% of people who experience epidural hematomas briefly lose consciousness, but
appear to be just fine when they come to. If pressure in the head continues to
build, over a period of a few hours, a searing headache tends to develop as increased
intracranial pressure causes the dura mater to tear away from the skull.
Other
signs and symptoms that may develop with an epidural hematoma include:
Lethargy
Nausea
Dizziness
Drowsiness
Weakness
on one side of the body
The
keys to preventing serious brain damage and death from an epidural hematoma is
to recognize what has happened, and for the blood to be aspirated by a neurosurgeon.
I
have long recommended that any person who suffers a blow to the side of the head
- especially in the temple region - be carefully monitored for any of the signs
noted above, and to be ready to visit a physician immediately.
Common
causes of epidural hematomas include:
Skiing and snowboarding falls that involve head trauma. According to the American
Association of Neurological Surgeons, 1.5 million Americans suffered brain injuries
in 2007, and more than 10,000 of these injuries occurred while skiing or snowboarding.
Violent
blows to the head during physical altercations.
Motor
vehicle accidents.
Clearly,
if you ever take part in an activity where there's a strong chance that you could
experience a blow to your head, it's wise to wear a helmet. And there's nothing
prissy about making the decision to avoid high-risk activities like boxing, high-speed
skiing, and high-level contact sports like football and hockey.
Please
note that there are many different forms of internal bleeding in the skull, and
epidural hematomas can arise from tears or lacerations of arteries other than
the middle meningeal artery.
Another
major type of internal bleeding in the head is a subdural hematoma, where the
bleeding occurs below the dura mater. Subdural hematomas are a leading cause of
brain injury and death in battered children - direct blows by a care-giver's hand,
a child's head being smashed against a hard object, or violent shaking of a small
child can all lead to serious injury and death through internal bleeding.
In
all cases of head injuries, the warning to heed remains the same: If you suffer
a blow to the head, even if you feel fine immediately afterward, stay alert for
signs of discomfort and consider being evaluated by a physician if you feel anything
out of the ordinary - even a mild headache that comes on after experiencing blunt
force to your head should not be ignored.
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