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<blockquote data-quote="Blackhawk" data-source="post: 103262" data-attributes="member: 16042"><p>Saul, a few random things in relation to your post:</p><p></p><p>Re: the vascular side of things; Yes in concept, and you might just want to term them "vascular" since cardio means heart. In general the same things that affect the vascular system as a whole affect the coronary arteries. The term cardiovascular is common since the health of the vascular system affects the heart muscle too. CAD (coronary artery disease) is probably most relevant to vascular disease of the coronary arteries. </p><p></p><p>CAD is not the be all end all of cardiac morbity and mortality, but statistically THE major player.</p><p></p><p>The heart is predominantly muscle, but that too is not the end of what comprises the heart. It is a biomechanical pumping system with valves, bioelectrical control, neurological feedback systems etc where many other things can go wrong besides just CAD leading to heart attack. Muscle is only part of that system. </p><p></p><p>There is an idiosyncrasy with the coronary arteries that makes them different than other arteries in the body. I don;t know definitely whether this contributes to higher incidence of vascular problems in the coronary vs other arteries in the body: Whereas the typical artery is under systolic pressure when the heart contracts and squirts blood into the aorta, due to their physical location wrapped around the contracting muscle, the coronary arteries do not receive that systolic pressure. They actually undergo what's called myocardial extravascular compression which prevents them from filling; They fill when the heart muscle relaxes and the relative pressure in the coronary artery drops relative to pressure in the aorta. Blood is thus pulled into the coronary artery rather than having it pumped into it. This filling is a low pressure rather than high pressure function, kind of backwards from the other arteries in the body. As such the hydraulics are different which is at least theorized to contribute to the more common incidence of coronary artery pathology. And, when these things happen in the coronary artery, the consequences are greater than in say an arm or leg!</p><p></p><p>There are also other cardiac anomalies like problems with electric signalling and conduction, arrhtymias including commonly atrial fibrillation, artery spasms, and mechanical problems like valve regurgitation etc. Some vascular issues can contribute to these, for example if a portion of heart muscle is not receiving enough oxygenated blood due to reduced blood flow from a diseased artery it's electrical conductivity can change and result in arrhythmia. This can happen at levels shy of full fledged heart attack, but the relationship between the vascular issue and the cardiac result is intertwined.</p></blockquote><p></p>
[QUOTE="Blackhawk, post: 103262, member: 16042"] Saul, a few random things in relation to your post: Re: the vascular side of things; Yes in concept, and you might just want to term them "vascular" since cardio means heart. In general the same things that affect the vascular system as a whole affect the coronary arteries. The term cardiovascular is common since the health of the vascular system affects the heart muscle too. CAD (coronary artery disease) is probably most relevant to vascular disease of the coronary arteries. CAD is not the be all end all of cardiac morbity and mortality, but statistically THE major player. The heart is predominantly muscle, but that too is not the end of what comprises the heart. It is a biomechanical pumping system with valves, bioelectrical control, neurological feedback systems etc where many other things can go wrong besides just CAD leading to heart attack. Muscle is only part of that system. There is an idiosyncrasy with the coronary arteries that makes them different than other arteries in the body. I don;t know definitely whether this contributes to higher incidence of vascular problems in the coronary vs other arteries in the body: Whereas the typical artery is under systolic pressure when the heart contracts and squirts blood into the aorta, due to their physical location wrapped around the contracting muscle, the coronary arteries do not receive that systolic pressure. They actually undergo what's called myocardial extravascular compression which prevents them from filling; They fill when the heart muscle relaxes and the relative pressure in the coronary artery drops relative to pressure in the aorta. Blood is thus pulled into the coronary artery rather than having it pumped into it. This filling is a low pressure rather than high pressure function, kind of backwards from the other arteries in the body. As such the hydraulics are different which is at least theorized to contribute to the more common incidence of coronary artery pathology. And, when these things happen in the coronary artery, the consequences are greater than in say an arm or leg! There are also other cardiac anomalies like problems with electric signalling and conduction, arrhtymias including commonly atrial fibrillation, artery spasms, and mechanical problems like valve regurgitation etc. Some vascular issues can contribute to these, for example if a portion of heart muscle is not receiving enough oxygenated blood due to reduced blood flow from a diseased artery it's electrical conductivity can change and result in arrhythmia. This can happen at levels shy of full fledged heart attack, but the relationship between the vascular issue and the cardiac result is intertwined. [/QUOTE]
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