30% blockage in mid LAD

My dad is 51 and has dyslipidemia, hypertension and hypothyrodism and on medical treatment. He did an exercise test on 13/8/09 and exercised for 7:17 mins acheiving a work level of MAX. HR was 72 bpm rose to max HR of 144 bpm. max heart pressure was 150/80 mmHg. test was stopped due to dyspnea. had positive stress test suggestive of inducible ischemia. was found to have 30% blockage in one mid LAD.

most if not all of the above is written by a doctor! My question is.. is 30% in mid LAD artery dangerous? i read that it was insignificant and that it could be treated by lifestyle changes such as weight loss and control over blood pressure and cholestrol. this is all being worked on right now. please note that he does not smoke. My family is worried that the 30% blockage in that area may be threatening possibly causing a heart attack. please note also that he has no chest pains or pain anywhere else. He only feels lazy at times. Is it possible for such a blockage to go away? if so... how easy/hard and how fast can we see a change? thanks a lot for your help!

Arsany

[ed34]

arteries are actually a lot bigger than they really need to be, they have a good reserve to them. You can have a 50% blockage and not notice it. I believe guidelines state that
70% and above should be treated with surgery and anything less is not considered a
real life threat. 30% is not much but the concern is how quickly it will grow.
The blockage will not go away on its own and there are many people with blockages this
size that are unaware of the fact.

[kenkeith]

AHA/ACC guidelines are no intervention with any occlusion less than 70%...usually does not present any SOB, chest pain, etc..  If there are symptoms (chest pain, etc), medication is the first option...medication can/will open (dilate) coronary arteries and relieve symptoms.  If medication is not an option (does not relieve symptoms or not able to tolerate), then a stent implant.  If the occlusion is not appropriate for a stent (too long, complex location, too many lesions or an emergency) then a bypass.

It is very unlikely and not probable to have a heart attack based on coronary occlusions.  When it is a problem the reduction of blood/oxygen due to  occlusions present symptoms of shortness of breath, chest pain, fatigue, etc., and that occurs (usually) before any heart failure....

There are other medical problems that produce the same symptoms of coronary occlusions.  With other problems treated or ruled out, medication, lifestyle, diet, etc. should be effective.