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PbSe quantum dots (QDs) were formed on TiO2 by a two-step photodeposition technique. At the first step, UV-light irradiation of TiO2 in an ethanol solution of H2SeO3 yields Se QDs on the TiO2 surface in a highly dispersed state (Se/TiO2). At the second step, UV-light irradiation of Se/TiO2 in an ethanol solution of Pb(ClO4)2 transforms Se QDs into several tens of nanometer-sized cubic deposits identified as PbSe (PbSe/TiO2) by X-ray diffraction, electronic absorption measurements and X-ray photoelectron spectroscopy. Photochronopotentiometry measurements suggested that the PbSe QDs are formed on TiO2 via the Pb(2+) ion-assisted reduction of Se particles., (Copyright © 2015. Published by Elsevier Inc.)

The clinical significance of silent myocardial ischemia (SMI) in the elderly was assessed in 91 patients with Q wave infarction who showed ischemic ST depression during treadmill stress testing, as well as reversible defect (RD) during dipyridamole thallium imaging. They were divided into two groups (47 patients with silent ST depression and 44 patients with painful ST depression) and compared for scintigraphic and coronary arteriographic features, and prognosis. There was no significant difference in age, gender and site of infarction between the two groups. The prevalence of single and double vessel coronary stenosis was higher in patients with SMI (66%) than in those with painful ischemia (p < 0.05). The results of treadmill stress testing showed a longer exercise duration (4.7 +/- 1.7 vs. 4.1 +/- 1.8 min) and higher maximal heart rate (138 +/- 15/vs. 126 +/- 20/min) in patients with SMI than in those with painful ischemia (p < 0.01). Dipyridamole thallium imaging revealed a larger infact (18.8 +/- 9.1 vs. 14.6 +/- 10.2 segments) in patients with SMI than in those with painful ischemia (p < 0.05). The prevalence of RD in the area of infarction was also higher in patients with SMI (74%) than in those with painful ischemia (45%) (p < 0.05). Although a higher proportion of the patients with painful ischemia (42%) underwent CABG or PTCA as their initial therapy, compared with those with SMI (25%) (ns), there was no difference in the cardiac event rate between the two groups who were initially treated medically. Dipyridamole thallium imaging is useful in the assessment of SMI in elderly patients with Q wave myocardial infarction. Those with SMI may have a larger infarct and a higher prevalence of ischemia localized within the infarction than those with painful ischemia.

To assess the clinical significance of silent myocardial ischemia (SMI) in the elderly, 113 patients with stable angina who showed ischemic ST depression during treadmill stress testing were studied by dipyrimadole thallium imaging and coronary arteriography. They were divided into two groups: 44 patients with silent ST depressions and 69 patients with painful ST depressions. The groups were compared for scintigraphic and coronary arteriographic features as well as prognosis. There was a significantly greater proportion of older patients (> or = 65 years) in the group with SMI (64%) than in the group with painful ischemia (38%) (p < 0.01), although there was no difference in the mean ages of the two groups. The prevalence of multivessel coronary stenosis was not significantly different between the two groups (45% in the SMI group and 61% in the group with painful ischemia). Treadmill stress testing showed no differences in exercise duration, maximal heart rate, maximal systolic blood pressure, or maximal ST depression between the two groups. Dipyrimadamole thallium imaging revealed similar results in the site of reversible defects (RD), i.e. 76% in the anterior area and 24% in the inferior area in patients with SMI, and 83% in the anterior area and 17% in the inferior area in patients with painful ischemia. However, the size of RD was significantly smaller in patients with SMI, i.e. 14.6 +/- 6.1 segments in patients with SMI and 18.7 +/- 8.3 segments in patients with painful ischemia (p < 0.05). Although a significantly higher proportion of patients with painful ischemia (48%) underwent PTCA or CABG as their initial therapy as compared to those with SMI (16%), there was no significant difference in the cardiac event rate between the two groups initially treated medically. Among patients with stable angina, those with SMI may have a smaller amount of ischemic myocardium and may be older in a greater proportion than those with painful ischemia. Dipyrimadole thallium imaging is useful in the assessment of SMI in the elderly.

To determine whether the orientation of the major orifice of a mitral tilting disc prosthesis affects hemodynamics, intracavitary blood flow patterns were studied in 45 patients with well-functioning Björk-Shiley mitral prosthesis using color Doppler flow imaging. The major orifice was oriented towards the septum in 23 patients (12 men, 11 women, age 58 +/- 11 years; group S), and towards the posterior wall in 22 patients (8 men, 14 women, age 55 +/- 9 years; group P). 1) The left ventricular end-diastolic dimensions (S: 4.8 +/- 0.9 cm, P: 5.2 +/- 1.0 cm), end-systolic dimensions (S: 3.6 +/- 0.9 cm, P: 3.8 +/- 1.2 cm), and left atrial dimensions (S: 5.0 +/- 1.0 cm, P: 4.7 +/- 0.9 cm) did not differ significantly between the 2 groups. 2) The peak mitral flow velocities (S: 1.43 +/- 0.38 m/sec, P: 1.43 +/- 0.27 m/sec), pressure gradients (S: 8.5 +/- 4.0 mmHg, P: 8.4 +/- 3.1 mmHg), and pressure half-times (S: 94.0 +/- 19.0 msec, P: 86.5 +/- 21.7 msec) did not differ significantly between the 2 groups. 3) Although mitral regurgitation was detected in 8 patients (35%) in the S group and in 2 patients (9%) in the P group, hemodynamically significant regurgitation was detected in only 4 patients in the S group (3 mild, one moderate). 4) The patients in the S group had reversed intracavitary blood flow; mitral flow was first directed towards the left ventricular outflow tract during diastole, while the outflow pattern was displaced into the left ventricular inflow tract.(ABSTRACT TRUNCATED AT 250 WORDS)