Objective:To summarize characteristics and rules of blood pressure variability (BPV) in children with H-type hypertension, in an attempt to explore some basis for further selection of the time points of treatment.Methods:A total of 117 children diagnosed as essential hypertension in Children′s Hospital Affiliated to Capital Institute of Pediatrics from March 2018 to September 2019 were selected as the research objective.According to the serum level of homocysteine (Hcy), those children were divided into the simple essential hypertension group (74 cases, Hcy≤13.9 μmol/L) and the H-type hypertension group (43 cases, Hcy>13.9 μmol/L). All children received 24 h ambulatory blood pressure monitoring (24 h ABPM), and BPV indexes were recorded and subject to group comparison.Meanwhile, the serum Hcy level was monitored.Besides, the demographic data and such blood biochemical indexes as blood glucose, blood fat and renal function were recorded or measured for an analysis of the correlation between BPV and each index.Results:There were no significant differences in gender, age, body mass index (BMI) and biochemical indexes between the simple essential hypertension group and the H-type hypertension group (all P>0.05). Compared with the simple essential hypertension group, the H-type hypertension group had a significantly higher 24 h systolic blood pressure standard deviation [24 h SSD, (11.21±3.23) mmHg vs.(9.64±2.73) mmHg, 1 mmHg=0.133 kPa, t=-2.806, P<0.05], nighttime systolic blood pressure standard deviation [nSSD, (10.79±3.89) mmHg vs.(9.26±3.23) mmHg, t=-2.292, P<0.05], and nighttime diastolic blood pressure standard deviation [nDSD, (10.23±3.53) mmHg vs.(8.73±2.93) mmHg, t=-2.617, P<0.05]. Pearson correlation analysis showed that the serum Hcy level was significantly positively correlated with 24 h, SSD, nSSD and nDSD ( r=0.194, 0.183, 0.182, all P<0.05). Conclusions:24 h SSD in children with H-type hypertension is significantly higher, with an obvious increase in both nSSD and nDSD, and the serum Hcy level was significantly positively correlated with BPV, which suggested that it was required to effectively control the serum Hcy level, reduce the range of blood pressure fluctuation and select the optimal time points of treatment, thus delaying the progress of hypertension.

Objective:To analyze clinical characteristics and high-frequency ultrasound features of localized scleroderma, and to construct and validate a non-invasive prediction model for staging of skin lesions based on the high-frequency ultrasound features.Methods:Patients with localized scleroderma were retrospectively collected from the Department of Dermatology and Venereology, Second Xiangya Hospital of Central South University from February 1, 2021 to February 28, 2023, and clinical data as well as high-frequency ultrasound and pathologic features of 85 lesions from these patients were analyzed. Lesions were divided into modeling cohort and validation cohort according to the chronological order of patient enrollment. The univariate analysis and multivariable logistic regression models were used to analyze the independent influential factors in the staging of localized scleroderma lesions in the modeling cohort, construct the regression equation, and to build a nomogram prediction model. The Bootstrap validation method was used for internal validation, and the predictive performance of the nomogram model in the modeling cohort and validation cohort was further evaluated by the calibration curve and receiver operating characteristic (ROC) curve.Results:In the modeling cohort, 60 patients with localized scleroderma, including 16 males and 44 females, were enrolled, with the age [ M ( Q1, Q3) ] being 22.0 (10.0, 39.2) years, and there were 28 lesions in the oedematous phase and 32 lesions in the fibrotic and atrophic phase; in the validation cohort, 25 patients with localized scleroderma, including 8 males and 17 females, were enrolled, with the age being 18.0 (7.0, 30.0) years, and there were 9 lesions in the oedematous phase and 16 lesions in the fibrotic and atrophic phase. Univariate analysis in the modeling cohort showed no significant differences in the age and gender of patients or the location of lesions between the oedematous phase group and the fibrotic and atrophic phase group (all P > 0.05) ; compared with the oedematous phase group, the fibrotic and atrophic phase group showed an increased proportion of patients with disease duration ≥ 2 years (20/32 cases vs. 10/28 cases, χ2 = 4.29, P = 0.038), decreased thicknesses of the subcutaneous fat layer in skin lesions (1.4 [0.0, 26.0] mm vs. 1.8 [0.1, 14.3] mm, Z = -2.14, P = 0.032), increased decrements in the subcutaneous fat layer thickness in the lesional sites compared with non-lesional control sites (1.8 [0.5, 11.0] vs. 0.3 [-1.9, 8.0] mm, Z = -4.72, P < 0.001), increased ratios of the lesional elasticity values to control elasticity values (2.9 [1.8, 6.9] vs. 1.8 [1.1, 5.9], Z = -4.34, P < 0.001), and increased ultrasound-based lesional activity scores (5.0 [3.0, 8.0] points vs. 3.0 [0.0, 5.0] points, Z = -4.76, P < 0.001). Multivariable logistic stepwise regression analysis showed that the disease duration ≥ 2 years ( P = 0.032), increased ratios of the lesional elasticity values to control elasticity values ( P = 0.019), increased ultrasound-based lesional activity scores ( P = 0.013), and increased decrements in the subcutaneous fat layer thickness in the lesions compared with the controls ( P = 0.013) helped to confirm localized scleroderma lesions in the fibrotic and atrophic phase. Based on the results of regression analysis, a total of 4 factors were included in the nomogram prediction model, including the disease duration, the decrement in the subcutaneous fat layer thickness in lesions compared with controls, the ratio of the lesional elasticity values to control elasticity values, and the ultrasound-based lesional activity score; additionally, the constructed logistic regression model formula for predicting the probability (p) of skin lesions in fibrotic and atrophic phase was "ln (p/[1 - p]) = -9.595 + 2.204 × the disease duration + 0.784 × the decrement in the subcutaneous fat layer thickness in the lesions compared with the controls (mm) + 0.887 × the ratio of the lesional elasticity values to control elasticity values + 1.374 × the ultrasound-based lesional activity score". The calibration curve showed a good predictive performance of the model through the Bootstrap validation method, and the ROC curve demonstrated good discrimination and accuracy (modeling cohort: area under the curve = 0.936, 95% CI: 0.879 - 0.994; validation cohort: area under the curve = 0.889, 95% CI: 0.748 - 1.000) . Conclusions:High-frequency ultrasound could provide essential details for staging the localized scleroderma lesions. Based on the disease duration, subcutaneous fat layer thickness, skin elasticity values, and ultrasound-based lesional activity scores, the constructed prediction model could predict the stages of localized scleroderma lesions with excellent discrimination, accuracy, and predictive performance.