Critical cardiology : And now , drug abuse inside human coronary arteries !
Posted Jan 18 2009 2:13am
Drugs are poisons , whenever it is administered without valid purpose. it can enter human body in many ways (Oral, intravenous, percutaeneous etc ) And now we have another route namely intracoronary !
In quest for prevention of restenosis, many of the anti cancer drugs are now delivered directly inside the coronary arteries .These drugs are secreted like a sustained release tablet from the drug coated stents.These drugs are expected to prevent restenosis within the stented segment.But, after years of intense debate and research , we realised the drugs the stent elute could damage the distal coronary vascular bed and coronary microcirculation.( And thus came the epidemic of acute stent thrombosis )
The tender and sensitive coronary microvasculature is constantly exposed to these powerful anticancer drugs .It is a great surprise , no body thought of this dangerous drug -coronary artery interaction !It required the genius of Renu virmani and others to point out this
What is the long term effects of drugging a coronary artery ?
Is no reflow or slow flow more common after DES , because of the adverse drug reaction in the distal vascular bed ?
If a patient after a DES undergoes a CABG later what is the impact of the drug on the graft ? Will the functional vasodilatation affected ?
Final message
A drug , to get a legal clearance it has to undergo hundreds of rigorous tests . Finally it is cleared for that specific indication for which it is tested .Just because a drug is cleared for one purpose ( Paclitaxel for malignancy ) it does not mean it is safe to use for any other purpose for which it is deemed to be useful . Exactly the opposite is happening here in the real world .No body wondered to think what would be the effect of these drugs on the normal coronary endothelial cells and vasculature.Is it not a crime without analysing this particular issue dozens of drug eluting stents have been released in the market .Now sounds of crying foul is heard world wide !
Let us thank , the so called negative forces in cardiology for making this an issue . In science , the watch dogs should bark at times of danger not wag the tail !
Drugs are poisons , whenever it is administered without valid purpose. it can enter human body in many ways (Oral, intravenous, percutaeneous etc ) And now we have another route namely intracoronary !
In quest for prevention of restenosis, many of the anti cancer drugs are now delivered directly inside the coronary arteries .These drugs are secreted like a sustained release tablet from the drug coated stents.These drugs are expected to prevent restenosis within the stented segment.But, after years of intense debate and research , we realised the drugs the stent elute could damage the distal coronary vascular bed and coronary microcirculation.( And thus came the epidemic of acute stent thrombosis )
The tender and sensitive coronary microvasculature is constantly exposed to these powerful anticancer drugs .It is a great surprise , no body thought of this dangerous drug -coronary artery interaction !It required the genius of Renu virmani and others to point out this
Read this land mark article from circulation
http://circ.ahajournals.org/cgi/content/full/115/8/1051?maxtoshow=&HITS=10&#
Questions that need to be answered
If a patient after a DES undergoes a CABG later what is the impact of the drug on the graft ? Will the functional vasodilatation affected ?
Final message
A drug , to get a legal clearance it has to undergo hundreds of rigorous tests . Finally it is cleared for that specific indication for which it is tested .Just because a drug is cleared for one purpose ( Paclitaxel for malignancy ) it does not mean it is safe to use for any other purpose for which it is deemed to be useful . Exactly the opposite is happening here in the real world .No body wondered to think what would be the effect of these drugs on the normal coronary endothelial cells and vasculature.Is it not a crime without analysing this particular issue dozens of drug eluting stents have been released in the market .Now sounds of crying foul is heard world wide !