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24 Cards in this Set

  • Front
  • Back
LAD supplies what part of the myocardium
anterio wall of LV and anterior septum
the Left circumflex artery supplys what wall of the myocardium
later wall of LV
the right coronary artery supplies what part of the myocardium
right ventricle, inferior wall of the LV and posterior septum
the sinus node is supplied by what artery
RCA (right coronary artery) or the LCF (Left coronary artery)
the A-V node is supplied by what artery?

it is a branch of ? the right coronary artery
Posterior descending artery (PDA)

it is a branch of the right coronary artery in most individuals but sometimes it is a branch of the left coronary artery
The His-Purkinje system is supplied by what artery?
the anterior 2/3 is supplied by the LAD and the posterior 1/3 is supplied by the PDA (usually the RCA)
stretch receptors in the aorta and carotid sinus are sensitive to
blood pressure

(contribute to the baroreflex)
stretch receptors in the cardiac chambers are sensitive to
heart size -

contribue to reflexes controlling blood volume
systemic vasculary resistance =
(BP-CVP) / Cardiac Output
diastasis
a phase of varying duration during diastole in which little volume change occurs.
The Swan-Ganz catheter measures pulmonary wedge pressure which is proportional to
left ventricular volume (or roughly equal to LV diastolic pressure)
left ventricular ejection fraction (E.F.)=?
E.F = (EDV-ESV) / EDV
the "sympathetic squeeze"
combined arteriolar and venous constriction that occurs as part of the baroreflex in response to hypotension
normal central venous pressure (CVP) which roughly equals RA P =
0-5 mmHG
what is the normal pressure in the pulmonary artery
10-25 / 5-15 mmHg
normal pulmonary wedge pressure would be
0-12mmHg
what is the most common clinical estimate of afterload
systolic blood pressure
how does the valsalva maneuver cause syncope
bearing down against a closed glottis.
decrease of blood pumped through lungs
transient decrease in LV filling (underfilling)
hypotentension and hypoperfusion
syncope
orthostatic syncope
fainting when a person assumes the erect posture.
the decrease in venous return would normally stimulate the sympathetic baroreflex due to hypotension. if problem with this then syncope
how does eating increase volume load
splanchnic vasodilation increases GI blood flow.
why might angina be made worse by the cold
cold induces vasoconstriction (pressure load)
what is the difference between isotonic and isometric exercise
isotonic is endurance and dynamic (volume load due to vasodilation)

isometric is stregnth training. there is pressure load since it takes more pressure to achieve flow through the tensed skeletal muscle
what kind of hypertrophy does isotonic versis isometric conditioning lead to
isotonic: eccentric
isometric: concentriv
why is remodeling initially benefiial in heart failure
it decrease wall stress to maintain CO. but eventually leads to progressive dilation and apoptosis