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- $Unique_ID{BRK00391}
- $Pretitle{}
- $Title{Exercise After Heart Attack}
- $Subject{heart circulation collateral exercise exercising Circulatory
- lifestyle lifestyles end arteries secondary branching artery coronary artery
- disease CAD}
- $Volume{G-23}
- $Log{
- Exercise Strengthens the Heart*0003202.scf
- Exercise Improves Circulation*0003207.scf}
-
- Copyright (c) 1991-92,1993 Tribune Media Services, Inc.
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- Exercise After Heart Attack
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- QUESTION: After recovering nicely from a heart attack, my physician suggested
- that a carefully structured exercise program could lead to new arteries
- growing in my heart that would protect me from future attacks. I am now
- jogging, though at times it's a struggle, and I keep wondering if this is
- really working. What do you think?
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- ANSWER: Your question leads us into some interesting medical history, and a
- current area of debate. Anatomically speaking, there are two types of
- arteries; those that end at the tissue they feed, appropriately named "end
- arteries," and secondary or branching arteries that connect main artery
- systems, called "collateral arteries". When an end artery becomes blocked, as
- during a heart attack, the tissue it serves dies, unless blood can flow to the
- tissue through collateral vessels. An early English physiologist, Richard
- Lower, described the presence of collateral vessels in the human heart in
- 1669, and this was accepted doctrine until 1873, when Josef Hyrtl, professor
- of anatomy at Vienna, failed to find these arteries using a technique that
- made a cast of all the vessels and corroded away all other tissue. These two
- opposing views were debated for 80 years until 1960 when W.F. Fulton showed
- that tiny capillary-like channels did indeed connect different coronary
- arteries. It is pretty well agreed that reduced blood flow to the tissue of
- the heart stimulate these capillaries to grow and increase blood flow to the
- suffering tissue. It would certainly appear to be so in important experiments
- conducted in animals, and we know that patients that have survived longest
- with chronic coronary artery disease (CAD) show increased collateral
- circulation when post mortem examinations are performed. Your physician is
- correct in that patients with CAD do better when following a prescribed
- exercise training program. What is missing is the proof that the increased
- demand for oxygen needed by the heart during exercise can be the stimulus for
- new growth in the collateral vessels in humans. Investigations that might
- prove this are difficult to construct and costly to run. Until such data is
- available it is difficult to answer your question absolutely, but in my
- opinion from existing research, you are probably doing yourself a world of
- good.
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-
- The material contained here is "FOR INFORMATION ONLY" and should not replace
- the counsel and advice of your personal physician. Promptly consulting your
- doctor is the best path to a quick and successful resolution of any medical
- problem.
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