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Timothy R. S. Harward, M. D. , Eugene F. Bernstein, M. D. , Ph. D. , A

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Presentation on theme: "Timothy R. S. Harward, M. D. , Eugene F. Bernstein, M. D. , Ph. D. , A"— Presentation transcript:

1 The value of power frequency spectrum analysis in the identification of aortoiliac artery disease 
Timothy R.S. Harward, M.D., Eugene F. Bernstein, M.D., Ph.D., A. Fronek, M.D., Ph.D.  Journal of Vascular Surgery  Volume 5, Issue 6, Pages (June 1987) DOI: / (87) Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

2 Fig. 1 Power frequency spectrogram generated from 6 msec peak systolic segments of three Doppler signals. f50% = bandwidth at 50% peak amplitude; fmax = highest frequency at the 15% amplitude level. Journal of Vascular Surgery 1987 5, DOI: ( / (87) ) Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

3 Fig. 2 Scattergram of peak frequencies (fmax) both before and after cuff occlusion from all five different arterial categories. To the right of each collection of points is shown the mean ± 1 standard deviation. A-I = aortoiliac; SFA = superficial femoral artery. Journal of Vascular Surgery 1987 5, DOI: ( / (87) ) Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

4 Fig. 3 A-C. Actual power frequency spectrograms. A, Control; B, isolated aortoiliac disease—stenosis greater than 50%; C, multilevel disease—aortoiliac disease greater than 50%/superficial femoral artery stenosis greater than 50%. Journal of Vascular Surgery 1987 5, DOI: ( / (87) ) Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

5 Fig. 3 D-E. Actual power frequency spectrograms. D, Multilevel disease—aortoiliac stenosis less than 50%/superficial femoral artery stenosis greater than 50%; E, common femoral artery stenosis greater than 50%. Journal of Vascular Surgery 1987 5, DOI: ( / (87) ) Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

6 Fig. 4 Scattergram of the maximal increase in f50% values (Δf50%) after cuff release for all five different arterial categories. To the right of each collection of points is shown the mean ± 1 standard deviation. A-I = aortoiliac; SFA = superficial femoral artery. Journal of Vascular Surgery 1987 5, DOI: ( / (87) ) Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

7 Fig. 5 Receiver operator characteristic (ROC) curve for f50% values demonstrates 2000 to 2100 Hz to be the best cut-off point to accurately differentiate between hemodynamically significant and insignificant proximal lesions. Journal of Vascular Surgery 1987 5, DOI: ( / (87) ) Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

8 Fig. 6 Scattergram of f50% values (bandwidth at 50% of peak amplitude) before and after cuff occlusion. The interrupted line represents the cut-off value (2000 Hz) between a positive and a negative result. To the right of each collection of points is shown the mean ± 1 standard deviation. Journal of Vascular Surgery 1987 5, DOI: ( / (87) ) Copyright © 1987 Society for Vascular Surgery and North American Chapter, International Society for Cardiovascular Surgery Terms and Conditions

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