Non-invasive measurement of colonic blood flow distribution using laser Doppler imaging

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Abstract
Background: This study tested a prototype laser Doppler scanner for the measurement of human colonic blood flow. Methods: Blood flow distribution was assessed in human colon during operation in six controls and in six patients with inflammatory bowel disease undergoing colectomy. Image processing software analysed several hundred reading points, expressing average flow in perfusion units. Results: Blood flow in the colon was not significantly lower in the control group than in patients with inflammatory bowel disease (mean(s.e.m.) 297·8(24·5) versus347.2(59·0) perfusion units, P=0·12). Intestinal colonic mural blood supply was demonstrated up to a distance of 6 cm and ischaemia demarcation lines were identified before the onset of visible changes. Conclusion: This prototype laser Doppler flowscanner overcomes the previous limitations of laser Doppler flowmeters and may have many clinical and research applications.