Term
| SA and AV nodes are supplied by ___ |
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Definition
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Term
| What artery supplies the inferior portion of the left ventricle 80% of the time and via what branch? |
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Definition
| Right coronary artery via the Posterior Descending |
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Term
| Enlargement of what part of the heart can cause dysphagia? |
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Definition
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Term
CO=
(equation using stroke volume) |
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Definition
| (stroke volume)x(heart rate) |
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Term
CO=
(equation using O2 consumption) |
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Definition
| (rate of O2 consumption)/ (arterial O2 content - venous O2 content) |
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Term
Mean arterial pressure=
(equation using diastolic and systolic pressures) |
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Definition
| 2/3 diastolic pressure + 1/3 systolic pressure |
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Term
pulse pressure=
(equation) |
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Definition
systolic pressure- diastolic pressure
(is equivalent to stroke volume) |
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Term
| 4 Things that increase cardiac contractility |
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Definition
1. Catecholamines (increase activity of calcium pump in SR)
2. increase intracellular calcium
3. decrease extracellular sodium (decrease Na+/Ca2+ exchanger)
4. Digitalis (increase intracellular sodium) |
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Term
| 5 things that decrease cardiac contractility |
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Definition
1. β1 blockade (decreases cAMP)
2. Heart failure
3. Acidosis
4. Hypoxia/hypercapnea
5. Ca2+ channel blockers |
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Term
| Name a venodilator and its affect on the heart |
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Definition
Nitroglycerine
Decreases preload |
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Term
| Name a vasodilator and its affect on the heart |
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Definition
Hydralazine
Decreases afterload |
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Term
Ejection fraction=
(equation) |
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Definition
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Term
| What is a normal ejection fraction? |
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Definition
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Term
| What accounts for most of peripheral resistance? |
|
Definition
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Term
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Definition
mitral and tricuspid valve closure
(beginning of systole) |
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Term
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Definition
Aortic and pulmonary valve closure
(beginning of diastole) |
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Term
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Definition
| In early diastole (right after S2) from increased filling pressures (assoc. with dilated ventricles) |
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Term
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Definition
| In late diastole (right before S1)- atrial kick, assoc. with ventricular hypertrophy/ stiff left ventricle |
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Term
| What is normal S2 splitting? |
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Definition
| Aortic valve closes before pulmonic, inspiration increases this difference (decreased intrathoracic pressure sucks blood into lungs and sends less to left heart) |
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