[Hologic's Flat-Panel Detector].

We measured and evaluated digital, pre-sampling and overall imaging properties (characteristic curve, Modulation Transfer Function (MTF), Wiener spectrum (WS), Noise Equivalent Quanta (NEQ) and Detective Quantum Efficiency (DQE)) for Hologic's direct type and Cannon's indirect type of Flat-Panel Detector (FPD). First, the digital and overall characteristic curves of both types of FPD were more wide dynamic range than that of the S/F system. Second, the pre-sampling and overall MTF of the direct-type FPD system were superior to those of the indirect-type FPD system.

[Evaluation of inhibitory effect of isoflurane on the hypoxic pulmonary vasoconstriction response in dogs].

The effect of isoflurane on hypoxic pulmonary vasoconstriction (HPV) was examined using the separately ventilated left lower lobe lung model in dogs. When the HPV was induced with anoxic gas ventilation of the left lower lobe, the magnitude of HPV inhibition by isoflurane of 2 MAC was predominant, as assessed by the index of pressure-flow curve which is a novel indicator of pulmonary vascular tone in the left lower lobe. However, isoflurane 2 MAC attenuated the HPV by only 16%, as assessed by indices of the changes in left lower lobe blood flow rate and PaO2.

Suppressive action of enflurane on dorsal horn neurons in rabbits.

The neurophysiologic mechanism of the suppressive action of enflurane on spinal nociceptive transmission was examined in rabbits with intact and with transected spinal cords. Enflurane suppressed nociceptive responses in both intact and transected spinal cord groups. The suppressive effects of enflurane were significantly greater in the intact group than in the transected group.

Effect of sevoflurane on hypoxic pulmonary vasoconstriction in the perfused rabbit lung.

Background: In vitro studies have shown that isoflurane, enflurane, and halothane inhibit the hypoxic pulmonary vasoconstriction (HPV) with essentially the same potency. The aim of this study is to compare the effects of sevoflurane and isoflurane on HPV in constant-flow perfused rabbit lungs.

Methods: Constant-flow perfused lungs from Japanese white rabbits were tested.

Effects of sevoflurane and halothane on reperfusion-induced arrhythmia in the isolated rat heart.

The effects of sevoflurane and halothane on reperfusion-induced arrhythmia in the isolated rat heart were examined. Reperfusion-induced ventricular fibrillation (VF) occurred in all rat hearts, and the duration of VF was 151 +/- 11 (mean +/- SEM) seconds in the control group (no anesthetics administered). Sevoflurane changed neither incidence nor duration of VF at 1, 2, and 3 minimum alveolar concentrations (MAC) of anesthetic.