Input Impedance of Revascularized Skeletal Muscle, Renal, and Mesenteric Vascular Beds

Journal Article (Journal Article)

Input impedance describes the relationship between pressure and flow in a vascular system and, hence, characterizes the outflow bed. The purpose of this investigation was to measure input impedance spectra in vascular reconstructions of skeletal muscle, renal, and mesenteric beds. Input impedance was measured in 107 vascular reconstructions in 96 patients. Reconstructions were performed at the aortofemoral/aortoiliac (AF, n = 20), femoropopliteal (FP, n=18), femorodistal (FD, n=41), infrapopliteal-inframalleolar (IM, n = 6), renal (REN, n = 16), or mesenteric (MES, n= 6) level. Grafts were constructed from autologous vein in all cases except AF bypasses in which bifurcated woven Dacron grafts were employed. Input impedance was measured intraoperatively after reperfusion. For impedance calculation, simultaneously acquired intraluminal pressure (transducer-tipped pressure catheter) and blood flow (electromagnetic probe) waveforms of ten-second duration were digitized at 200 Hz and subjected to Fourier transformation in near real-time. AF grafts exhibited the highest blood flow (443 ± 72.8 mL/minute) followed by MES (300 ± 30.4), REN (172 ± 43.9), FP (91.6 ± 20.0), FD (59.3 ± 5.09), and IM grafts (22.4 ± 5.44 mL/minute). A similar (inverse) trend was observed with respect to resistance (Rin), ie, MES≈AF<<

Full Text

Duke Authors

Cited Authors

  • Schwartz, LB; Purut, CM; Craig, DM; Smith, PK; McCann, RL

Published Date

  • January 1, 1996

Published In

Volume / Issue

  • 30 / 6

Start / End Page

  • 459 - 470

International Standard Serial Number (ISSN)

  • 1538-5744

Digital Object Identifier (DOI)

  • 10.1177/153857449603000604

Citation Source

  • Scopus