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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.

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Presentation on theme: "Transit-time flow measurement for detection of early graft failure during myocardial revascularization  Beat H Walpoth, MD, Andreas Bosshard, MS, Igor."— Presentation transcript:

1 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 (September 1998) DOI: /S (98)

2 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  , DOI: ( /S (98) )

3 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  , DOI: ( /S (98) )

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