穿琥宁脂质体包封率的测定

采用乙醇注入法制备穿琥宁脂质体。分别采用葡聚糖凝胶过滤法、透析法、超速冷冻离心法分离脂质体和游离药物，计算脂质体包封率。结果表明，3种方法中超速冷冻离心法测得的平均包封率最高。4℃离心（268000×g）2h后，测得平均包封率为96．9％。     

Decreased affinity of low density lipoprotein (LDL) particles for LDL receptors in patients with cholesteryl ester transfer protein deficiency

Abstract. We have reported that the disorder of lipoprotein metabolism in hyperalphalipoproteinae-mic patients with a deficiency of cholesteryl ester transfer protein (CETP) is characterized by the poly-disperse low density lipoprotein (LDL) particles and the accumulation of cholesteryl ester (CE) in high density lipoprotein (HDL) particles, forming cholesterol-induced HDL (HDLc)-like particles. In the present study we have investigated the interaction of these abnormal LDL with LDL receptors of normal human fibroblasts. Since the ultracentrifugally separated LDL fraction (1.019 < d < 1.063 gmL^-1) from the CETP-deficient patients contained HDLc-like particles, these particles were removed by anti-apolipoprotein (apo) A-I immunoaffinity column chromatography. The lipoproteins eluted in the unbound fraction of this column did not contain apo A-I, so this fraction was considered to be authentic LDL. The authentic LDL of the patients were deficient in CE and rich in triglycerides and apo B. The authentic LDL itself showed polydispersity, ranging in size from 23 nm to 30 nm. The affinity of these abnormal LDL particles for LDL receptors was analysed by a competitive assay in which cold LDL from the patients or control compete with ¹²⁵I-labelled LDL for fibroblast LDL receptors. The concentration of LDL particles at which 50% of ¹²⁵I-labelled normal LDL was replaced was two to three times higher for the patients than for the normal control. Therefore, the affinity of patient LDL was thought to be reduced compared to that of control LDL. These results demonstrate that CETP may play an important role in making LDL particles homogeneous and rich in CE. This modulation of LDL by CETP may enhance the affinity of LDL for LDL receptors to deliver cholesterol to peripheral tissues.     

Three-dimensional ultrasonography in evaluation of benign prostatic hyperplasia

BACKGROUND: The clinical application of volume estimation by 3-D ultrasound has recently gained much attention. However, there have been no reports evaluating the prostate volume by 3-D transrectal ultrasound (TRUS) before transurethral resection of the prostate (TURP). The purpose of the present study was to evaluate the value of 3-D TRUS for prediction of prostate morphology and resected weight before TURP and to investigate whether 3-D TRUS is a more useful examination than 2D TRUS in patients with benign prostatic hyperplasia (BPH). METHODS: Transurethral resection of the prostate was performed in 23 patients with BPH. We evaluated the prostate morphology and measured both the volumes of the whole prostate and the transition zone using 2-D and 3-D TRUS, respectively. The actual resected weight was recorded and compared with the volume of the whole prostate and that of the transition zone measured by 2D and 3-D TRUS. RESULTS: The volume of the transition zone measured by 3-D TRUS correlated most strongly with the resected weight (r = 0.84). A large median lobe was seen in three patients in whom the transition zone volume measured by 2-D TRUS was considerably larger than the resected weight. However, overestimation in the three patients decreased by the use of 3-D TRUS. CONCLUSIONS: It was concluded that 3-D TRUS was equal or superior to 2-D TRUS in prediction of the resected weight and 3-D TRUS offers better information as a diagnostic tool before TURP.     

Effect of decompressive hemicraniectomy in patients with acute middle cerebral artery infarction

Background/aim We aimed to determine in which cases this procedure may be more effective based on the data of patients who underwent decompressive hemicraniectomy (DHC).Material and methodsOverall, 47 patients who underwent DHC due to acute middle cerebral artery (MCA) infarction between January 2014 and january 2019 were retrospectively investigated. These patients were divided into two groups: those who died after DHC (Group A) and those who survived DHC (Group B). The groups were compared in terms of various parameters. We investigated whether the patient’s modified Rankin scale (mRS) status changed depending on age (> 60 and < 60 years).ResultsThe median age of all patients was 65 (37–80) years; groups A and B had median ages of 66.5 (37–80) and 61 (44–79) years (p = 0.111), respectively; 55.3% patients were male. The elapsed times until hospitalization after the onset of symptoms were 4.5 and 3 h in groups A and B, respectively (p = 0.014). The median GCS score at the time of admission was 7 (5–12) and 10 (8–14) in groups A and B, respectively (p = 0.0001). At the time of admission, 63.3% patients in group A had anisocoria, whereas no patient in group B had anisocoria (p = 0.0001). In postoperative period, 40% patients in group A and all patients in group B received AC/AA treatment. The survival of patients aged < 60 and > 60 years who underwent DHC for MCA infraction was 61.5% and 26.5%, respectively (p = 0,041). The median mRS of patients < 60 and > 60 years were 4 (1–6) and 6 (1–6), respectively (p = 0.018).Conclusion Age, DHC timing, and elapsed time until hospitalization or access to treatment directly affect the functional outcome and survival in MCA-infarcted patients who underwent DHC. In patients in whom the medical treatment fails, early DHC administration will increase survival without waiting for neurological worsening once herniation is detected radiologically.