In the emergency room even the doctors look worried. The CAT scan shows "blood around the brain," something doctors call a "subarachnoid hemorrhage." There could possibly be other problems, such as a blot clot in the brain itself ("intracerebral hemorrhage) and/or something called "hydrocephalus" (water on the brain, building up after blood cells have gradually clogged, the brain's drainage system).
The AneurysmThe brain is interesting for many reasons. Of prime importance, the brain uses, pound for pound, more energy than any other part of the body. It must be guaranteed just the right amount of blood for every instant of its life in order to survive and function well. Of all of the blood that the heart pumps, the brain needs the most. It weighs about 5% of the body's total weight, yet it demands and monopolizes about 20% of the volume the heart puts out. The blood vessels at the base of the brain (these are the largest, and "smartest" of all vessels) have the capability to control -- even commandeer -- blood to supply the brain as conditions demand. When we lie down, these vessels constrict automatically to prevent the brain from being flooded with an over supply. And, when we jump up, these vessels have the James Bond-like buttons built in, to make sure that the heart not only pumps harder, but also that the other blood vessels open up enough to handle the increased volume required by the brain. Thus, these blood vessels have three things that are needed for survival:
1.Elasticity that allows them to keep their shape (like socks)
2."Smooth muscle," that can be relaxed or tightened as conditions require
3.An electronic feedback system (i.e. sensors and nerves) that makes everything work.
People who grow aneurysms have an inborn problem with the elasticity part of these blood vessels. The elastic layer is not formed properly (being randomly, rather than regularly organized). This weaker part of the blood vessel begins to bulge and balloon over the years. It is this bulge which is actually called the "aneurysm." It develops in places where the pressure is greatest -- usually where the vessels divide into multiple routes. It enlarges and enlarges, and enlarges further still. Eventually, its chance of "popping" like an over inflated balloon becomes real. When the local blood pressure exceeds the strength of that vessel's weak point, the danger of rupture is at hand.
In these people, over the years of their lifetimes, and at the points along these vessels where the defect in the elastic layer exists, a gradual bulge and finally a balloon develops in places where the pressure is greatest (usually where the vessels divide). Over time, the result is a little (and ever-enlarging) balloon called an "aneurysm." And, as for all balloons, the chance of "popping" becomes real when the local blood pressure exceeds the strength of the balloon's wall at its weakest point.
When they do pop, a surprisingly small amount of blood escapes, due to the efficiency of the blood's clotting system. It's difficult to imagine, but only 5 to 10 cc's of blood could be responsible for causing such disastrous consequences! In those people whose aneurysms bleed much more, death occurs even before they get arrive at the hospital.
"Brain Attack"
1/3rd of people with ruptured aneuryms die before they get to the hospital.
1/3rd die after they get to the hospital.
1/3rd survive after they get to the hospital. Of these, 40% end up with neurological problems that make life difficult.
Let's look at the problems that occur after arrival at the hospital. Then, the all important "how-to-prevent and/or fix" them as they arise. First...
Truth and Consequences Solution
Hemorrhage? Statistics show death rate of 60%. Fix the aneurysm early
Hydrocephalus? An insult added to the injury Place a "shunt."
Vasospasm? The 1/3 who die after coming to the "Triple H" therapy
hospital
Preventing Second Hemorrhage
In the emergency room, the doctors will try everything to prevent the small clot at the rupture point in the aneurysm from dissolving or becoming dislodged altogether. They will concentrate on three things:
* Keeping the blood pressure spikes form occurring again. (Give blood pressure medications, prevent anxiety attacks, keep the environment calm).
* Giving drugs to prevent the clot from dissolving ("Amicar" can only be used for the short-term, because it will cause blood clots in the legs and lungs to become a problem.)
* Avoiding convulsions (drugs such as dilantin, phenobarbitol).
Once the patient is stable, and the full support team is assembled, the definitive procedure to prevent re-bleeding can be undertaken: The Operation.--
The operation has as its aim the "clippings" of the aneurysm at the base of its neck (just like tying off a balloon), so that it is eliminated from the blood circulation of the brain.
The aneurysm can be seen by a number of techniques, the most reliable and accurate of which is an angiogram. A catheter is passed into the vessels at the base of the brain and a radio-opaque dye (called contrast) is injected while X-Rays are taken. This study sets up the road map of the blood supply to the brain, and brings the anatomy of the aneurysm to light. Other, less invasive ways to do angiography include MRI scanning (MRAngiography) and the Spiral CT Scan using intravenous rather than intraarterial contrast. These studies give a 3-D character to the images, making them particularly helpful to the surgeon.
Aneurysms can also be cured by other techniques in selected cases. A revolution (some call it a rapidly expanding evolution) is occuring in the technology of "interventional radiology," allowing doctos to fill aneurysms with metal coils, glue, balloons, and even "stents."(JR: What is a stent?) There may well be a future in which surgery will become the other option, if such rapid progress brings the hoped-for results.
The innumerable improvements and in microsurgical technology and techniques, indicates that the least of the patient's problems is surgery. Surgical morbidity and mortality is arbout 2 % (but up to 15% for the most difficult of aneurysms), yet, it is the most frightening part of the whole story. Surgery is, in point of fact, the least threatening treatment. Patients and their families always look at the surgeon strangely, when he says, "Surgery is the easy part overall! Don't worry so much about that part of it; much more difficult hurdles await during the next few weeks of therapy.
