ABSTRACT
Objective:To investigate the 12-lead electrocardiogram findings and their clinical significance in children with orthostatic hypertension (OHT), providing evidence for clinical diagnosis and treatment of OTH.Methods:Thirty-four children with OHT who received diagnosis and treatment in the Zhuji Second People's Hospital from January 2017 to December 2019 were included in the OHT group. An additional 34 healthy children who concurrently received routine physical examination were included in the control group. Both groups of children underwent a 12-lead electrocardiogram in lying and standing positions. The changes in ST-segment and T-wave amplitudes in the lying position relative to the standing position were compared between the two groups.Results:The changes in T-wave amplitude of leads II, V 5, and V 6 in the OHT group were (0.07 ± 0.11) mV, (0.13 ± 0.12) mV, and (0.14 ± 0.11) mV, respectively, which were significantly higher than those in the control group [(0.02 ± 0.07) mV, (0.05 ± 0.06) mV, (0.03 ± 0.04) mV, t = 2.24, 3.48, 5.48, P = 0.029, 0.001, < 0.001). There were no significant differences in the changes in T-wave amplitude of other leads between the two groups (all P > 0.05). There was no significant difference in change in ST-segment amplitude on 12-lead electrocardiogram images between the two groups (all P > 0.05). The area under the curve of the changes in T-wave amplitude of leads II and V 5 in predicting OHT in children was 0.596 and 0.672 respectively, the sensitivity was 64.71% and 55.88%, respectively, and the specificity was 70.59% and 61.76%, respectively. The changes in T-wave amplitude of leads II and V 5 had low efficacy in predicting OHT in children. The area under the curve of the change in T-wave amplitude of lead V 6 in predicting OHT in children was 0.738, and the sensitivity and specificity were 76.47% and 67.65%, respectively. The change in T-wave amplitude of lead V 6 had moderate efficacy for predicting OHT in children. Conclusion:The changes in T-wave amplitude of lead V 6 on the electrocardiogram image taken in the lying position relative to the standing position are of certain value in predicting OHT in children. The 12-lead electrocardiogram can provide important evidence for clinical prediction and diagnosis of OHT in children.
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Objective To assess the relationship between Mycoplasma pneumonia (MP) and sex,age and season,and to provide a basis for the epidemiology of MP.Methods The serum samples were tested for Mycoplasma pneumonia antibody IgM (MP-IgM) by enzyme-linked immunosorbent assay for 782 children with respiratory tract infection.Results Among the 782 children with respiratory tract infection,221 (28.3％,221/782) were MP-IgM positive,and no difference was seen between male and female (P＞ 0.05).The incidence was in all ages,but it in 3-5 years old was the highest (50.0％,78/156),and ＜ 1 year old was the lowest (9.6％,19/198),there was significant difference compared with the others (P＜ 0.05).The total MP-IgM positive rate in children less than 6 years old was 32.4％ (193/595),which was higher than that in children over 6-14 years old [15.0％ (28/187)] (P ＜ 0.05).MP was epidemic in all year round,but the positive rate of MP-IgM was highest in spring (42.6％,107/251),the positive rate in summer,autumn and winter was 27.4％(57/208),10.8％(19/176) and 25.9％(38/147),respectively,and there was significant difference (P ＜ 0.05).Conclusions MP infections in children demonstrate a definite seasonality,and the positive rate may differ by age.The higher rate of MP infection is higher in the children less than 6 years old without sexual difference.MP is epidemic in spring.
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Objective: To explore the structural domains of the CENP-E protein that interact with Mps1 protein.Methods: Two recombinant vectors named pEGFP-CENPE2(containing 674-1085 amino acids of CENP-E protein) and pEGFP-CENPE 3(containing 1200~2134 amino acids of CENP-E protein) were transfected into human embryo kidney 293(HEK293) cells respectively.The respective energy transfer efficiency(Ef) between either EGFP-CENPE2 and Mps1,or EGFP-CENPE3 and Mps1 were detected by FRET through selective photobleaching of the acceptors.Results: Both recombinant proteins expressed in HEK293 cells transfected by the recombinant plasmids were found to co-localize with the Mps1 protein as confirmed by confocal microscopy.The Ef between EGFP-CENPE3 and Mps1 protein was [(12.63?0.48)%,n=30] and that between EGFP-CENPE3 and Mps1 protein was [(3.17?0.21)%,n=30] as revealed by the results from FRET,the result of FRET was confirmed by co-Immunoprecipitate(CO-IP) method.When compared with that between the control and Mps1,the Ef between EGFP-CENPE3 and Mps1 was significantly higher(p