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Unformatted text preview: 70 bpm ( avg ) Pulmon & Aortic Semi-Lunar valves CLOSED Lub-Dup = S1 S2 S1 S2 etc. S1 S2 Lub - Systole ( P/A Semi-Lunar valves OPEN ) Regurgitation / insufficiency- valves fail to CLOSE S2 S1 Dup - Diastole ( Tri/Bi valves OPEN ) Stenosis- valves fail to OPEN Fetal heart has Ductus Arteriosis that allows blood flow from Pulmonary Aorta Closes after birth & becomes Ligamentum Arteriosum Fetal heart has blood flow DIRECTLY R /L Atria via the Foramen Ovale...
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- Winter '11