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24 Cards in this Set
- Front
- Back
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LAD supplies what part of the myocardium
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anterio wall of LV and anterior septum
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the Left circumflex artery supplys what wall of the myocardium
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later wall of LV
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the right coronary artery supplies what part of the myocardium
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right ventricle, inferior wall of the LV and posterior septum
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the sinus node is supplied by what artery
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RCA (right coronary artery) or the LCF (Left coronary artery)
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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 |
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The His-Purkinje system is supplied by what artery?
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the anterior 2/3 is supplied by the LAD and the posterior 1/3 is supplied by the PDA (usually the RCA)
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stretch receptors in the aorta and carotid sinus are sensitive to
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blood pressure
(contribute to the baroreflex) |
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stretch receptors in the cardiac chambers are sensitive to
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heart size -
contribue to reflexes controlling blood volume |
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systemic vasculary resistance =
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(BP-CVP) / Cardiac Output
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diastasis
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a phase of varying duration during diastole in which little volume change occurs.
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The Swan-Ganz catheter measures pulmonary wedge pressure which is proportional to
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left ventricular volume (or roughly equal to LV diastolic pressure)
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left ventricular ejection fraction (E.F.)=?
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E.F = (EDV-ESV) / EDV
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the "sympathetic squeeze"
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combined arteriolar and venous constriction that occurs as part of the baroreflex in response to hypotension
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normal central venous pressure (CVP) which roughly equals RA P =
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0-5 mmHG
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what is the normal pressure in the pulmonary artery
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10-25 / 5-15 mmHg
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normal pulmonary wedge pressure would be
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0-12mmHg
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what is the most common clinical estimate of afterload
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systolic blood pressure
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how does the valsalva maneuver cause syncope
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bearing down against a closed glottis.
decrease of blood pumped through lungs transient decrease in LV filling (underfilling) hypotentension and hypoperfusion syncope |
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orthostatic syncope
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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 |
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how does eating increase volume load
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splanchnic vasodilation increases GI blood flow.
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why might angina be made worse by the cold
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cold induces vasoconstriction (pressure load)
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what is the difference between isotonic and isometric exercise
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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 |
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what kind of hypertrophy does isotonic versis isometric conditioning lead to
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isotonic: eccentric
isometric: concentriv |
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why is remodeling initially benefiial in heart failure
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it decrease wall stress to maintain CO. but eventually leads to progressive dilation and apoptosis
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