Transit-time flow measurement for detection of early graft failure during myocardial revascularization Beat H Walpoth, MD, Andreas Bosshard, MS, Igor.

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Transit-time flow measurement for detection of early graft failure during myocardial revascularization Beat H Walpoth, MD, Andreas Bosshard, MS, Igor Genyk, MD, Beat Kipfer, MD, Pascal A Berdat, MD, Otto M Hess, MD, Ulrich Althaus, MD, Thierry P Carrel, MD The Annals of Thoracic Surgery Volume 66, Issue 3, Pages 1097-1100 (September 1998) DOI: 10.1016/S0003-4975(98)00653-5

Fig 1 Transit-time flow measurement of left internal mammary artery (LIMA) to left anterior descending coronary artery. Shown are coronary bypass flow (Q1) (top signal), aortic pressure (P1) (second signal), standard-lead electrocardiogram (ECG) (third signal), vascular resistance (fourth signal), and fast Fourier transformation of flow FFT(Q1)) (bottom signal) at baseline in the presence of graft occlusion (A), after redoing of the anastomosis (B), and after maximal vasodilation with adenosine (25 μg · kg−1 · min−1) (C). Note the flow increase from 1.0 to 25 mL/min after distal anastomosis was redone and further increase to 46 mL/min after infusion of adenosine. At the same time, there is a marked diastolic flow pattern to the IMA flow curve. After the corrective operation and especially after adenosine infusion, fast Fourier transformation shows a harmonic repetitive signal with a limited amount of frequency content. The Annals of Thoracic Surgery 1998 66, 1097-1100DOI: (10.1016/S0003-4975(98)00653-5)

Fig 1 Transit-time flow measurement of left internal mammary artery (LIMA) to left anterior descending coronary artery. Shown are coronary bypass flow (Q1) (top signal), aortic pressure (P1) (second signal), standard-lead electrocardiogram (ECG) (third signal), vascular resistance (fourth signal), and fast Fourier transformation of flow FFT(Q1)) (bottom signal) at baseline in the presence of graft occlusion (A), after redoing of the anastomosis (B), and after maximal vasodilation with adenosine (25 μg · kg−1 · min−1) (C). Note the flow increase from 1.0 to 25 mL/min after distal anastomosis was redone and further increase to 46 mL/min after infusion of adenosine. At the same time, there is a marked diastolic flow pattern to the IMA flow curve. After the corrective operation and especially after adenosine infusion, fast Fourier transformation shows a harmonic repetitive signal with a limited amount of frequency content. The Annals of Thoracic Surgery 1998 66, 1097-1100DOI: (10.1016/S0003-4975(98)00653-5)