Flashcards in coronary anatomy and normal cardiac cycle/heart sounds Deck (10):
What usually supplies the SA and AV nodes?
RCA. infarcts may casue nodal dysfunction
right vs. left dominant ciculation
right dominant circulation- about 85% of people. posterior descending artery arises from the RCA
left dominant- 8%: posterior descending artery arises from the LCX (left circumflex)
codominant circulation- 7%: PDA arises from both RCA and LCX
How is the heart arranged in the chest? complications related to this anatomy?
most posterior part of the heart is the left atrium. enlargement can cause dysphagia d/t compression of the esophagus or hoarseness due to compression of the left recurrent laryngeal nerve.
What supplies the right ventricle?
the acute marginal artery, which arises from the RCA
What is supplied by the LAD?
anterior 2/3 of the interventricular septum, anterior papillary muscle, and anterior surface of left ventricle.
What is supplied by the posterior descending?
posterior 1/3 of the interventricular septum and posterior walls of the ventricles.
What is supplied by the LCX?
lateral and posterior walls of the left ventricle
Why does physiologic S2 splitting exist?
S2- closure of aortic and pulmonic valves. you hear S2 splitting during inspiration- takes longer for the pulm valve to close.
S3 vs. S4: which is which?
S3: Ken- tucky (or the non-PC: FUCK, YOU'RE screwed). implies fluid overload/high filling pressures, as with CHF or mitral regurg. may be normal in kids and pregnant women. it is an extra sound at the BEGINING of diastole.
S4: Tennessee (well FUCK, YOU) always abnormal. atrial "kick" at the very end of diastole. seen with left ventricular hypertropy and high atrial pressures. Left atrium must push against a stiff LV wall