Clinical correlation: MI Flashcards
what are the symptoms of MI in men
-squeezing chest rpessure or pain
-jaw, neck or back pain
-SOB
what are the symptoms of MI in women
-chest pain but not always
-pain or pressure in lower chest or upper abdomen
-jaw, neck, or upper back pain
-nausea or vimiting
-SOB
-fainting
-indigestion
-extreme fatigue
what happens on an EKG in an MI
ST segment elevation
-the flat section of an ECG that represents the interval between the two spikes of the heartbeat will be elevated during a MI
what happens in ischemic heart disease
-insufficient blood flow to heart muscle
-coronary arteries become narrowed by atherosclerosis and can become blocked by a thrombus
-affected area is deprived of O2
where is the right coronary artery
-RA
-RV (most of it)
-posterior surface of LA
where is the left coronary artery
-LA (most of it)
-LV
-sternocostal surface of RV
what are the common sites of coronary occlusion
-anterior interventricular branch of the LCA
-RCA
-circumflex branch of the LCA
what is the most common site of coronary occlusion
anterior interventricular branch of LCA
what are papillary muscles
cardiac muscle bundles that project from walls of ventricles
what do papillary muscles connect to
chordae tendinae to AV valves
what do papillary muscles do
-closure of mitral and tricuspid valves during systole
-prevent prolapse of valves into atria
what happens when papillary muscles are damaged
-damage to papillary muscle allows regurgitation of blood from ventricle to atrium during systole
-results in systolic murmur
what is dominance of coronary ateries
the artery that gives rise to the posterior interventricular artery
what are the different types of dominance and incidence percentages
-right coronary (67%)
-left coronary artery (15%)
-codominance is when both RCA and LCA give rise (18%)
- few people only have one coronary artery
what is the advantage of having a right dominant heart
right dominant hearts are likely to have better collateral circulation than left dominant hearts
