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Pressure amplitude increase on unmatching the aortic-iliac junction of the dog.

Pressure pulses were recorded simultaneously at the aortic/external iliac junction and in the abdominal aorta of six normal dogs at a distance 7—10 cm upstream of the junction. The matched abdominal aortic equitrifurcation was then transformed, in vivo, to an unmatched equibifurcation by temporary occlusion of the central branch and the pressure recording procedure repeated. An increase in the oscillatory pressure amplitudes at the junction was observed as a result of the unmatching procedure. At the upstream site the amplitude increase was similar to the junction site for only the first two harmonics of the pressure pulse. These changes were interpreted as being due to increased reflection from the unmatched junction and alteration in the peripherally reflected pressure waves reaching the aorta.