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The internal mammary artery bypass--the principles of preoperative and postoperative diagnosis using colour-duplex

J Madaric1, A Mistrik, J Pacak

  • 1Department of Cardiology, Slovak Institute of Heart and Vascular Diseases, Bratislava, Slovakia. jurmad@hotmail.com

Bratislavske Lekarske Listy
|January 5, 2002
PubMed

Insights

Color-duplex ultrasound effectively assesses left internal mammary artery (LIMA) bypass function after coronary artery bypass grafting (CABG). This non-invasive method detects changes in flow, indicating graft patency and potential failure early.

Area of Science:

  • Cardiovascular Surgery
  • Medical Imaging
  • Vascular Ultrasound

Background:

  • Coronary artery bypass grafting (CABG) frequently utilizes the left internal mammary artery (LIMA) as a graft.
  • Assessing LIMA bypass graft function post-CABG is crucial for patient outcomes.
  • Non-invasive methods are sought for reliable LIMA graft evaluation.

Purpose of the Study:

  • To evaluate the functional characteristics of LIMA bypass grafts after CABG.
  • To compare LIMA bypass flow with native LIMA flow using color-duplex ultrasound.
  • To determine the utility of ultrasound in assessing LIMA graft patency and function.

Main Methods:

  • Color-duplex ultrasound was used to examine 303 patients post-CABG with LIMA bypass.
  • Key parameters measured included peak systolic velocity (PSV), diastolic velocities (PDV, EDV), and calculated resistance indices (SDVR, RI).
  • Flow characteristics were compared between LIMA grafts and native LIMA in 70 patients before CABG.

Main Results:

  • Native LIMA exhibited high-resistance, predominantly systolic flow.
  • Post-CABG, LIMA grafts showed a shift to low-resistance, biphasic flow with increased diastolic velocities.
  • Dysfunctional grafts demonstrated decreased diastolic flow, increased resistance, and higher SDVR.

Conclusions:

  • Color-duplex ultrasound is a promising non-invasive tool for postoperative LIMA graft follow-up.
  • It enables assessment of bypass flow, functional status, and patency.
  • This method can aid in the early diagnosis of LIMA bypass graft failure.
Abstract

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