Aeroguide 20 - McDonnell Douglas F-18A Hornet by Roger Chesneau

By Roger Chesneau

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Extra resources for Aeroguide 20 - McDonnell Douglas F-18A Hornet

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The orange-yellow jet represents a small amount of regurgitant blood. 20a, b Systolic flow in the main pulmonary artery (MPA) and the proximal part of its two branches. Parasternal short axis view of the base (RBG2). a In neonates vortex formation at the bifurcation in common because of slight peripheral stenoses which are physiological for this age a b Later in life blood flows undisturbed from the MPA into both branches b Pulmonary Artery and Main Branches 41 healthy individuals and may be the consequence of this valve closure mechanism (Fig.

In Fig. 89 (p. 111). Typically, turbulence is observed in conditions of jet-like streaming as found in stenoses, regurgitations or high-pressure shunts. These turbulent jets are surrounded by eddies and vortices which may be imaged by a multicolored mosaic-like imaging pattern (see Figs. 4tt" '~ ' . ; ~ . . ~,' 'GE~AR III . . 0 LU-"- "~' . • . • • L \-y''-v . '''~ ~ ' -. : . /11 ~ . _ s. - . ,. -~ -1 '&: ' ..... ~ f#' f ~ . _~ ~r. ~ ~ 7 "t: -=. ~ '. _ - _-~.... -_; -= . ---AOR _ • . 5 Motions of the cardiac walls and valves in severe aortic incompetence.

4 Aorta (Ascending, Arch, Descending) The aorta receives the blood ejected from the left ventricle. Normally the aortic valve opens completely, aligning the leaflets parallel to the blood stream (Figs. 7). The aortic root is, however, not uniformly filled by the streaming blood. Between the aortic leaflets and the wall, in Valsalva's sinuses, there are special flow conditions. Blood flows backwards into each of the three sinuses around the free edges of the leaflets (Fig. 8). This may help to keep the valve in a position ready to close as soon as the left ventricular pressure falls below the aortic pressure with virtually no regurgitation.

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