FB-TW

Showing posts with label athererosclerotic plaque. Show all posts
Showing posts with label athererosclerotic plaque. Show all posts

Monday, February 6, 2012

60-Year Old Man Dies of High Cholesterol

60-year old man dies of high cholesterol

Never saw a headline like this? Neither have I. That’s because it doesn’t happen.

Cholesterol doesn’t harm, maim, or kill. It is simply used as a crude–very crude–marker. It is, in reality, a component of the body, of the cell wall, of lipoproteins (lipid-carrying proteins) in the bloodstream. It is used a an indirect gauge, a “dipstick,” for lipoproteins in the blood to those who don’t understand how to identify, characterize, and quantify actual lipoproteins in the blood.

Cholesterol itself never killed anybody, any more than a bad paint job on your car could cause a fatal car accident.

What kills people is rupture of atherosclerotic plaque in the coronary arteries. For all practical purposes, you must have atherosclerotic plaque in order for it to rupture (much like a volcano erupts and spews lava). It’s not about cholesterol; it’s about atherosclerotic plaque. Plaque might contain cholesterol, but cholesterol is not the thing itself that causes heart attack and death.

So why do most people obsess about cholesterol? Good question. It is, at best, a statistical marker for the possibility of having atherosclerotic plaque that ruptures. High cholesterol = higher risk for heart attack, low cholesterol = lower risk for heart attack. But the association is weak and flawed, such that people with high cholesterol can live a lifetime without heart attack, people with low cholesterol can die at age 43.The same holds true for LDL cholesterol, you know, the calculated value based on flawed assumptions about LDL’s relationship to total cholesterol, HDL cholesterol, and VLDL cholesterol.

A crucial oversight in the world of cholesterol: There are many other factors that cause atherosclerotic plaque and its rupture, such as inflammatory phenomena, calcium deposition, artery spasm, hemorrhage within the plaque itself, degradative enzymes, etc., none of which are suggested by cholesterol measures.

But one observation has held up, time and again, over the past 40 years of observations on coronary disease: The greater the quantity of coronary atherosclerotic plaque, the greater the risk of atherosclerotic plaque rupture. An increasing burden of atherosclerotic plaque along the limited confines of coronary arteries, just a few millimeters in diameter and a few centimeters in length, is like a house of cards: It’s bound to topple sooner or later, and the bigger it gets, the less stable it becomes.

If you are concerned about future potential for heart disease and heart attack, don’t get a cholesterol panel. Get a measure of coronary atherosclerotic plaque.

Tuesday, September 27, 2011

My cardiologist says.....

In answer to a question about cholesterol.

Q - I'm ... confused about getting cholesterol numbers down. In my reading I've discovered that there is a "cholesterol myth" - Uffe Ravnskov, Gary Taubes, etc. that says that cholesterol does not cause heart disease. Why am I trying to get these numbers if cholesterol does not cause heart disease? I cannot take statins so I'm concerned about this subject.


A - That's right: The issue is not cholesterol, nor was it ever cholesterol.

The issue is the kinds, numbers, and behavior of the complex particles in the blood that can contribute to atherogenesis, i.e, atherosclerotic plaque formation. They contain cholesterol, but the cholesterol component is not the crucial causal factor. These are, of course, lipoproteins.

Small LDL particles, for instance, have a unique conformation that makes the lysine residues on the resident apo B molecule more prone to glycation. Glycated small LDL particles are more prone to oxidation. The resultant glycoxidated small LDL molecule, in turn, is more readily able to cross intercellular barriers, is more adherent to the components of plaque, are poorly recognized by the liver receptor for LDL particles and thereby "lives" in the bloodstream much longer than larger LDL particles, and are avidly taken up by inflammatory cells.

So viewing this as a "cholesterol" problem is an incredible oversimplification that tends to focus on the wrongs things, such as statin drugs alone to "reduce cholesterol."


here