Myocardial tactile stiffness during acute reduction of coronary blood flow Kagami Miyaji, MD, Seiryo Sugiura, MD, Hirotaka Inaba, MD, Shinichi Takamoto,

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Presentation transcript:

Myocardial tactile stiffness during acute reduction of coronary blood flow Kagami Miyaji, MD, Seiryo Sugiura, MD, Hirotaka Inaba, MD, Shinichi Takamoto, MD, Sadao Omata, PhD The Annals of Thoracic Surgery Volume 69, Issue 1, Pages 151-155 (January 2000) DOI: 10.1016/S0003-4975(99)01095-4

Fig 1 Tactile sensor system: the sensor is 5.5-cm long, 7-mm in diameter, weighs 2.08 g, and is equipped with a small tip, 3-mm in diameter, that is connected to a piezoelectric transducer made of lead zirconate-barium titanate ceramics. (A/D converter = analogue to digital converter; LV = left ventricle; LAA = left atrial appendage; PA = pulmonary artery; RV = right ventricle; LAD = left anterior descending branch; D1 = first diagonal branch; D2 = second diagonal branch; ∗ = ligation of coronary artery.) The Annals of Thoracic Surgery 2000 69, 151-155DOI: (10.1016/S0003-4975(99)01095-4)

Fig 2 The pressure-volume loop (P-V loop) shifted to the right after coronary flow reduction, but neither the left ventricular pressure nor the pressure-volume area (PVA) changed. The Annals of Thoracic Surgery 2000 69, 151-155DOI: (10.1016/S0003-4975(99)01095-4)

Fig 3 Phasic changes in myocardial stiffness in response to reducing the coronary blood flow by 50%. (Left) Baseline myocardial tactile stiffness and coronary blood flow of the left anterior descending artery just distal to the first diagonal branch. (Right) Myocardial tactile stiffness under the reduced coronary blood flow. End-systolic tactile stiffness decreased as the coronary flow decreased. (Solid line = myocardial tactile stiffness; dotted line = coronary blood flow of the left anterior descending artery just distal to the first diagonal branch.) The Annals of Thoracic Surgery 2000 69, 151-155DOI: (10.1016/S0003-4975(99)01095-4)