Relationship between the macular retina vascular density and retinal circulation time in CRAO patients / 国际眼科杂志(Guoji Yanke Zazhi)

AIM: To observe the macular retina vascular density of patients with acute central retinal artery occlusion(CRAO)by optical coherence tomography angiography(OCTA)and to analyze the relationship with retinal circulation time of these patients on fundus fluorescein angiography(FFA).METHODS: Retrospective case analysis. A total of 43 patients(43 eyes)from January 2019 to March 2021 admitted to Shaanxi Eye Hospital with clinical diagnosis of acute CRAO(course of disease ≤7d)were included. All patients underwent FFA, OCTA, best corrected visual acuity(BCVA)examination and thrombolytic therapy. The patients with enhanced or unchanged retinal blood flow signal in the affected eye showed on OCTA before treatment compared with the contralateral healthy eye were assigned to group A, and the patients with retinal blood flow signal of the affected eye was lower than that in the contralateral healthy eye by OCTA were assigned to group B. Image J software was used for OCTA image processing to evaluate the macular retina vascular density before treatment, and FFA examination was performed to record the affected retinal circulation time before treatment.RESULTS: The retinal vascular density of patients in the affected eye and the contralateral healthy eye in group A was higher than that in group B(25.08%±4.40% vs 12.24%±3.41%, 25.72%±2.70% vs 17.89%±4.55%, all P<0.001), the filling time(FT)of retinal artery trunk to terminal in group B [96(20.50, 193.50)s] was longer than that in group A [11(5.00, 19.50)s](P<0.001). The course of disease, the retinal vascular density of contralateral healthy eye and FT were related factors of retinal vascular density of the affected eye(all P<0.05), and the influence strength order was FT, course of disease and the retinal vascular density of contralateral healthy eye, in which the course of disease and FT was negatively correlated with the retinal vascular density.CONCLUSION: OCTA retinal vascular density was correlated with FFA retinal circulation time in CRAO patients.

Observation of the retinal arteriovenous circulation time of patients with different stages of diabetic retinopathy / 国际眼科杂志(Guoji Yanke Zazhi)

AIM:To observe whether differences exist in the retinal arteriovenous circulation time of the patients with diabetic retinopathy and exploring whether there is any correlation between the injured degree of retinal vessel and the microcirculation time.METHODS:The study was conducted from the March 2016 to the March 2017 in order to analyze the clinical data on 60 eyes of 60 patients who were diagnosed with diabetic retinopathy by Xuanwu Hospital of Capital Medical University.According to the result,patients were divided into mild and moderate nonproliferative diabetic retinopathy (NPDR) group,severe NPDR group and proliferative diabetic retinopathy(PDR) group with 20 eyes respectively.Then we recorded the retinal arterial developing time of the three groups,namely arm-to-retinal circulation time (A1),retinal arterial branch filling time (A2),retinal venous branch laminar flow time (V1),retinal venous branch filling time (V2).RESULTS:The findings showed that there was no statistical difference among 3 groups in the retinal arterial passage time(A2-A1) (F=1.642,P=0.157).Retinal capillary passage time (V1-A2),retinal vein passage time (V2-V1),retinal artery and vein passage time (V2-A1) were compared between the three groups,the difference was statistically significant (F=5.794,5.180,5.564,P=0.007,0.009,0.008).The PDR group was significantly longer than the mild moderate and severe NPDR group,and the severe NPDR group was significantly longer than the mild and moderate NPDR group.CONCLUSION:The duration of DR is longer,the degree is more severely.The destruction of retinal capillaries is more serious,the time of retinal microcirculation is longer.

A lipophilic prodrug of Danshensu: preparation, characterization, and in vitro and in vivo evaluation / 中国天然药物

Danshensu [3-(3, 4-dihydroxyphenyl) lactic acid, DSS], one of the significant cardioprotective components, is extracted from the root of Salvia miltiorrhiza. In the present study, an ester prodrug of Danshensu (DSS), palmitoyl Danshensu (PDSS), was synthesized with the aim to improve its oral bioavailability and prolong its half-life. The in vitro experiments were carried out to evaluate the physicochemical properties and stability of PDSS. Although the solubility of PDSS in water was only 0.055 mg·mL, its solubility in FaSSIF and FeSSIF reached 4.68 and 9.08 mg·mL, respectively. Octanol-water partition coefficient (log P) was increased from -2.48 of DSS to 1.90 of PDSS. PDSS was relatively stable in the aqueous solution in pH range from 5.6 to 7.4. Furthermore, the pharmacokinetics in rats was evaluated after oral administration of PDSS and DSS. AUC and t of PDSS were enhanced up to 9.8-fold and 2.2-fold, respectively, compared to that of DSS. C was 1.67 ± 0.11 μg·mL for PDSS and 0.81 ± 0.06 μg·mL for DSS. Thus, these results demonstrated that PDSS had much higher oral bioavailability and longer circulation time than its parent drug.

Changes of retinal circulation time before and after panretinal laser photocoagulation in patients with diabetic retinopathy / 眼科新进展

Objective To observe the changes of preoperative and postoperative retinal circulation time in partretinal laser photocoagulation (PRP) in patients with diabetic retinopathy (DR).Methods Together 16 patients (16 eyes) were collected as the subjects in this study,who was diagnosed as severe non-proliferative and proliferative DR by fundus fluorescein angiography (FFA) examination and had PRP indications for undergoing pan-retinal laser photocoagulation.Then retinal arterial and venous cir culation time in all patients was recorded using FFA before and 1 to 3 months after treatment.Meanwhile,it was necessary to observe the following variables,including the developing duration and complete filling time of the four branches of the retinal artery,as well as the duration of the laminar flow and complete filling time of the four branches of the venous artery,followed by calculating mean transition time of retinal artery,retinal capillary,retinal vein,retinal arteriovenous flow for comparison and analysis of changes in transit time of retina in different time-periods before and after treatment.Results The mean transition time of the retinal capillary in patient was (1.58 ± 0.99) s before treatment and (2.19 + 1.23)s after treatment,and the difference was statistically significant(P =0.011),but there was no significant difference in the mean transition time of the retinal artery,retinal vein and arteriovenous flow (all P ＞ 0.05).Conclusion The transit time of the retinal capillary at 1 to 3 months after PRP is significantly longer than that before treatment.

Changes of retinal circulation time before and after panretinal laser photocoagulation in patients with diabetic retinopathy / 眼科新进展

Objective To observe the changes of preoperative and postoperative retinal circulation time in partretinal laser photocoagulation (PRP) in patients with diabetic retinopathy (DR).Methods Together 16 patients (16 eyes) were collected as the subjects in this study,who was diagnosed as severe non-proliferative and proliferative DR by fundus fluorescein angiography (FFA) examination and had PRP indications for undergoing pan-retinal laser photocoagulation.Then retinal arterial and venous cir culation time in all patients was recorded using FFA before and 1 to 3 months after treatment.Meanwhile,it was necessary to observe the following variables,including the developing duration and complete filling time of the four branches of the retinal artery,as well as the duration of the laminar flow and complete filling time of the four branches of the venous artery,followed by calculating mean transition time of retinal artery,retinal capillary,retinal vein,retinal arteriovenous flow for comparison and analysis of changes in transit time of retina in different time-periods before and after treatment.Results The mean transition time of the retinal capillary in patient was (1.58 ± 0.99) s before treatment and (2.19 + 1.23)s after treatment,and the difference was statistically significant(P =0.011),but there was no significant difference in the mean transition time of the retinal artery,retinal vein and arteriovenous flow (all P ＞ 0.05).Conclusion The transit time of the retinal capillary at 1 to 3 months after PRP is significantly longer than that before treatment.

The evaluation by pulmonary wedge angiography of children with pulmonary artery hypertension ;associated with congenital heart disease / 中国介入心脏病学杂志

Objective To study pulmonary wedge angiography ( PWA ) with hemodynamic the evaluation of children with congenital heart disease and pulmonary artery hypertension ( PAH) . Methods Hemodynamic measurement and pulmonary wedge angiography were performed in 50 children with congenital heart disease. Comparison and analysis were made from the data obtained from PWA and catheterization. Results After PWA, the patients were categorized into 3 groups according to the measured hemodynamics parameters:group A [ n=15, patients with normal mean pulmonary artery pressure ( mPAP≤25 mmHg) and normal pulmonary vessel resistance (PVR﹤300 dyne?s?cm5)], group B [n=24, patients with PAH (mPAP﹥25 mmHg) but normal PVR] and group C (n=11, patients with PAH and elevated PVR (PVR≥300 dyne?s?cm5). Rote of tapering (ROT) was significant lower in group C than in group A and B (F=42. 559,P﹤0. 05). Pulmonary circulation time (PCT) was higher in group C than in group A and B (F=6. 037,P﹤0. 05). ROT correlated negatively with PVR (r = -0. 606, P ﹤0. 05). PCT index correlated positively with PVR (r=0. 783,P=0. 01). There was no significant correlation between PCT and mean pulmonary artery hypertension (mPAP). Conclusions PWA may help to make quantitative analysis of the pulmonary vascular status in patients with congenital heart disease.

Peripheral Vascular Leakage Findings of Asymptomatic Eyes Based on Fluorescein Angiography

PURPOSE: To report peripheral vascular retinal leakage findings of asymptomatic eyes based on fluorescein angiography, and investigate the associated factors. METHODS: Data were collected retrospectively from 47 subjects (94 eyes) and the peripheral leakage results based on fluorescein angiography were analyzed. The relationship between peripheral leakage findings and other factors including-arm-retinal circulation time (ARCT) and venous filling time (VFT), refractive error, age, hypertension, and diabetes- was evaluated. RESULTS: Ten eyes had peripheral leakage (21.3%). The mean age was 34.7 +/- 7.86 years in the non-leakage group and 44.3 +/- 9.63 years in the leakage group; the difference between the groups was statistically significant (p = 0.001). The mean spherical equivalent was -2.85 +/- 2.71 diopter in the non-leakage group and -3.46 +/- 3.62 diopter in the leakage group; the difference between the groups were not significant (p = 0.471). The mean ARCT was 10.50 +/- 2.06 seconds in the non-leakage group and 11.76 +/- 2.47 seconds in the leakage group; the difference between the groups was statistically significant (p = 0.041). The mean VFT was 9.70 +/- 1.91 seconds in the non-leakage group and 10.75 +/- 1.40 seconds in the leakage group; the difference between the groups was statistically significant (p = 0.048). CONCLUSIONS: Peripheral leakage can be found in asymptomatic eyes. Age, VFT, and ARCT were correlated to peripheral leakage findings based on angiography. These leakage findings were thought to be related with histological properties and physiological changes in peripheral retina.

The relationship between the cerebral circulation time and disease condition and prognosis in patients with subarachnoid hemorrhage / 中国综合临床

Objective To investigate the relationship between the cerebral circulation time and disease condition and prognosis in patients with acute subarachnoid hemorrhage. Methods DSA were performed to determine the cerebral circulation time (CCT) in 60 patients who had subarachnoid hemorrhage (SAH) within 3 days. The patients were divided into different groups according to the severity of the disease condition,patients with CSC score as 13-15 were assigned as group Ⅰ ,whose CCT was (13.45 ± 1. 89) s. Twenty two patients with GSC score as 3-12 were assigned as group Ⅱ ,whose CCT was (16.79 ± 2. 07) s. There were significant difference between the CCT of the two groups (t =3. 76,P = 0. 001). (2)Twenty-nine patients with Hunt-Hess grade as 1-2 were assigned as group 1,whose CCT was (13.06 ± 1. 83) s. Thirty one patients with Hunt-Hess grade as 3-5 were assigned as group 2, whose CCT was (15. 89 ± 2.06) s. There were significant difference between the CCT of the two groups (t = 3. 39, P =0. 003). (3) Seventeen patients with delayed ischemic damage were assigned as group A, whose CCT was (16. 84 ±1.91) s. Forty three patients without delayed ischemic damage were assigned as group B, whose CCT was (12.94 ± 1. 67) s. There were significant difference between the CCT of the two groups (t = 2. 23, P =0.025). (4)Forty-six patients with GOS score as 4-5 were assigned as group a,whose CCT was (13.07 ±1. 89)s. Fourteen patients with GSC score as 1-3 were assigned as group b,whose CCT was (17.11 ± 1. 71)s. There were significant difference between the CCT of the two groups (t = 3. 27, P = 0.008). Conclusion CCT may reflect the severity of the SAH in early onset patients and has prognostic value.

Evaluation of cerebral circulation time by contrast-enhanced ultrasound in healthy adults / 中华超声影像学杂志

Objective To measure cerebral circulation time(CCT) of a group of normal adults by contrast-enhanced ultrasound. Methods Forty-seven cases of healthy volunteers without any cardio-cerebral disease history were enrolled in the study. Internal carotid artery and vertebral artery were observed and the blood flow was measured with high frequency probe. Contrast-enhanced agent SonoVue was injected bolus into median cubital vein. CCT was measured and calculated according to the contrast curve analysis. Contralateral CCT measurement was repeated when the blood flow signal resume to the baseline intensity. Cerebral blood volume was then calculated according to CCT and cerebral blood flow. Results All the imaging of carotid vessels was presented clearly in all objects. Cerebral blood flow was 603 ～ 990 ml/min with an average (778 ± 171)ml/min. Bi-lateral CCT was measured successfully,the value ranged 4. 1 ～ 10.2 s with average (6.22 ± 1.47) s. There were no significant differences both in contrast of left and right side of the carotid vessels and in contrast of three dosage groups ( P ＞0.05). The cerebral blood volume was 54～96ml with average (76 ± 27)ml. Conclusions Contrast-enhanced ultrasound can be useful in measurement and calculation of CCT and cerebral blood volume.

Basic and clinic study of the density proportion in forming AVM embolic agent-NBCA mixed liquid / 介入放射学杂志

Objective By analysing the relation between the proportion of NBCA and the arteriovenous circulation time will give the optimal proportion of NBCA for embolizing cerebral AVM with microcatheter clinically.Methods (1) The fresh aterial blood fractions from intracranial hemorrhage in vitro of 16 cases were mixed with the 20%、33%、50%、70% and 80% NBCA respectively and evaluated the coagulation times with the different densities of NBCA in the fresh aterial blood in vitro; (2) two cases were performed with superselective embolotherapy to five feeding arteri. Results (1) the correlation index between different densities of NBCA and the fresh areterial blood in vitro , T (c) =e 1.9994-1.487D , (2) about 90% nidus of AVM were occluded after embolization, and the fistulas of AVF were basically closed after embolization.Conclusions There is a mathematical model between the arteriovenous circulation time and the proportion of NBCA, thus providing the theoretical clinical application of the embolotherapy of CAVM with microcatheter.

Evaluation of Retinal Circulation Times in Rhegmatogeneous Retinal Detachment with SLO

This study was designed to evaluate the association between rhegmatogenous retinal detachment and retinal circulation times. We observed retinal circulation times in 30 patients with rhegmatogeneous retinal detachment before and after operation using the scanning laser ophthalmoscope. We measured arm to retina time(ART) and arteriovenous passage time(AVT) before the operations and after(average 2.5 weeks) successful reattachment of detached retina. Preoperative ART and AVP were 13.83 +/- 3.08 see and 2.91 +/- 0.69 see respectively, whereas postoperative ART and AVP were 13.60 +/- 2.99 see and 2.90 +/- 0.63 see in detached areas. There was no statistically significant difference between pre- and post-operative ART and AVP in detached retina(P>0.05). Preoperative ART and AVP in flat retinal area were 13.82 +/- 3.08 and 2.91 +/- 0.69 see respectively. There was no statistically significant difference between flat and detached area preoperatively (P>0.05). No significant correlation was noted between retinal circulation times and rhegmatogeneous retinal detachments by scanning laser ophthalmoscope.

ERG b/a ratio and retinal circulation time of CRVO

Fourteen cases of central retinal vein occlusion (CRVO) were studied with electroretinogram (ERG) and fluorescein angiogram. The cases were divided into a venous stasis retinopathy group (VSR,9 cases) and a hemorrhagic retinopathy group(HR, 5 cases). The b/a ratio and retinal circualtion time (RCT) were measured and compared with the control group. The mean b/a ratio of the HR group (0.86) was decreased as compared with the VSR group (1.18) and the control group (1.23). The RCT of the HR group was markedly delayed to 13.68 seconds as compared with the VSR group (11.09 sec) and the control group (6.4 sec). These facts suggest that both the b/a ratio and the RCT are possible parameters for estimating retinal ischemia and that the ERG is a reliable examination method for classification of CRVO.