Association of nutritional indices and prognosis of stroke patients: a systematic review and meta-analysis.

OBJECTIVE: The aim of this study was to document the association between malnutrition and mortality as well as functional outcomes in patients with stroke. MATERIALS AND METHODS: PubMed, Embase and Scopus databases were systematically searched for observational studies that had used either of the three nutritional indices, geriatric nutritional risk index (GNRI), prognostic nutritional index (PNI), and controlling nutritional status score (CONUT), and examined the association between malnutrition and outcomes of interest in patients with stroke. The primary outcome was mortality and secondary outcomes were risk of recurrence and functional disability. Analysis was performed using STATA 16.0 software (College Station, TX, USA) and pooled effect sizes were reported as either hazards ratio (HR) or as odds ratio (OR). Random effects model was used for the analysis. RESULTS: A total of 20 studies were included, of which, 15 were focused on acute ischemic stroke (AIS) patients. Among patients with AIS, moderate to severe malnutrition, assessed using CONUT (OR 4.80, 95% CI: 2.31, 9.98), GNRI (OR 3.57, 95% CI: 2.08, 6.12) and PNI (OR 8.10, 95% CI: 4.69, 14.0), was associated with increased risk of mortality within 3 months and at 1-year follow-up (CONUT: OR 2.74, 95% CI: 1.96, 3.83; GNRI: OR 2.26, 95% CI: 1.34, 3.81; PNI: OR 3.32, 95% CI: 2.24, 4.93). Patients with moderate to severe malnutrition, assessed using any of the three indices, had an increased risk of having an unfavourable outcome [modified Rankin Score (mRS) score of 3 to 6, denoting major disability and/or death] within 3 months and at 1-year follow-up. Only one study reported the risk of recurrence. CONCLUSIONS: Assessing malnutrition in stroke patients at the time of hospital admission using any of the three nutritional indices is useful due to the observed association of malnutrition with survival and functional outcomes. However, due to a limited number of studies, there is a need for large prospective studies to validate the findings observed in this meta-analysis.

[Current status of hypertension prevalence, treatment and control rate among young and middle-aged population in China].

Objective: To estimate the prevalence, awareness, treatment and control rate of hypertension among young and middle-aged population in China. Methods: The analysis was based on the results of 2012-2015 China Hypertension Survey, which was a cross-sectional stratified multistage random sampling survey. A total of 229 593 subjects were included in the final analysis. The data including sex, age, living in urban and rural areas, prevalence of hypertension, history of stroke, family history of coronary heart disease and drinking, physical examination, heart rate were collected. Hypertension was defined as mean systolic blood pressure (SBP) ≥140 mmHg (1 mmHg=0.133 kPa), and (or) diastolic blood pressure (DBP) ≥90 mmHg, and (or) self-report a history of hypertension, and (or) use of antihypertensive medicine within 2 weeks before survey. Prehypertension was defined as SBP between 120-139 mmHg, and (or) DBP between 80-89 mmHg. Control of hypertension was considered for hypertensive individuals with SBP<140 mmHg and DBP<90 mmHg. The prevalence of prehypertension, hypertension, awareness, treatment, control rate were calculated, and the control rate among those with antihypertensive medication was also calculated. Results: The prevalence of prehypertension and hypertension was 43.8% (95%CI: 42.3%-45.4%), and 22.1% (95%CI: 20.8%-23.3%), respectively. The prevalence of prehypertension and hypertension was significantly higher among male than female across different age groups. The awareness, treatment, control rate of hypertension and control rate among treated hypertensive participants were 43.8%, 33.2%, 16.7%, and 40.2%, respectively. The prevalence was higher, and the control rate was lower among individuals with higher heart rate. Conclusion: The prevalence of prehypertension and hypertension among young and middle-aged population is high, the awareness, treatment and control rate need to be further improved in this population. The prevention and treatment of hypertension should be strengthened in the future to improve the control rate of hypertension in China.

Comparison of Three Frailty Scales for Prediction of Adverse Outcomes among Older Adults: A Prospective Cohort Study.

OBJECTIVES: To compare the ability of Frailty Phenotype (FP), FRAIL and Frailty Index (FI) to predict adverse outcomes. DESIGN: A prospective cohort study. SETTING: A senior community in Beijing, China. PARTICIPANTS: A total of 188 older adults aged 65 years or older (mean age 84.0 ± 4.4 years, 58.5% female). MEASUREMENTS: Frailty was evaluated by FP, FRAIL and FI. The agreement between scales was assessed by Cohen kappa coefficient. The predictive value of the three scales for adverse outcomes during one-year follow-up period were analyzed using decision curve analysis(DCA) and receiver operating characteristic curve (ROC) analysis. RESULTS: Frailty ranged from 25% (FRAIL) to 42.6% (FI). The agreement between scales was moderate to good (Cohen's kappa coefficient 0.44~0.61). DCA showed though the curves of the scales overlapped across all relevant risk thresholds, clinical treating had a higher net benefit than "treat all" and "treat none" when risk of unplanned hospital visits ≥30%, risk of functional decline or falls ≥15%. The three scales had similar predictive value for unplanned hospital visits (area under ROC, AUC 0.63, 0.64 and 0.69). FRAIL and FI had similar predictive value for functional decline (AUC 0.63,0.65). FI had predictive value for falls (AUC 0.65). CONCLUSIONS: All three scales showed clinical utility but FRAIL may be best in practice because it is simple. Multidimensional measures of frailty are better than unidimensional for prediction of adverse outcomes among older adults.

[Related factors of sarcopenia in hospitalized elderly patients with coronary heart disease].

Objective: To explore the incidence and clinical characteristics of sarcopenia in hospitalized elderly patients with coronary heart disease and search for the related factors. Methods: This study was a single-center observational study. According to the inclusion criteria, elderly patients hospitalized with coronary heart disease from Peking Union Medical College Hospital between December 2017 and December 2018 were enrolled. The patients were divided into sarcopenic group and non-sarcopenic group according to the diagnostic criteria of the Asian Working Group for Sarcopenia. Activities of daily living of the patients were assessed (including ADL and IADL) . Comorbidity of the patients was evaluated by the Charlson comorbidity index (CCI). Long-term medication use of the patients was recorded to assesse whether there was polypharmacy. The nutritional status of the patients was examined by the mini nutritional assessment-short form (MNA-SF). The full tandem stance time of the patients was evaluated. The history of falls over the previous year, urinary incontinence, and living conditions of the patients were also recorded. Multivariate logistic regression was used to analyze the related factors for sarcopenia of elderly patients with coronary heart disease. Results: A total of 364 patients were enrolled in the study. The patients were aged 65-96 (74.6±6.5) years and there were 218 (59.9%) male patients. There were 264 cases of stable coronary heart disease and 100 cases of acute coronary syndrome. The median number of long-term used medication was 7. One hundred and fifty-two (41.8%) patients were complicated with type 2 diabetes, 38 (10.4%) patients were complicated with anxiety/depression, and 98 (26.9%) patients had the history of falls over the previous year. Eighty-two (22.5%) patients were complicated with urinary incontinence, 12 patients (3.3%) were complicated with malnutrition and 33 patients (9.2%) were living alone. There were 81 (22.3%) sarcopenic patients and 283 (77.7%) non-sarcopenic patients among all the hospitalized elderly patients with coronary heart disease. The sarcopenic patients were more older, with lower body mass index(BMI)(both P<0.001), higher CCI and more long-term used medication (both P<0.05), higher proportions of malnutrition, urinary incontinence, history of falls, and living alone (all P<0.05) compared to non-sarcopenic patients. ADL and IADL scores of sarcopenic patients were significantly lower than those of non-sarcopenic patients (both P<0.001). There was also a higher proportion of unable to accomplish full tandem stance among sarcopenic patients compared to non-sarcopenic patients (P<0.001). Moreover, higher hs-CRP level (P=0.047) , lower albumin level (P=0.004) and significantly lower prealbumin level (P<0.001) were observed in sarcopenic patients compared to non-sarcopenic patients. Stepwise multivariate binomial logistic regression analysis revealed that male (OR=5.036, 95%CI 1.782-14.230, P=0.002), low BMI (OR=0.883, 95%CI 0.796-0.980, P=0.019), as well as low prealbumin level (OR=0.990, 95%CI 0.980-1.000, P=0.045) were related factors for sarcopenia among elderly patients with coronary heart disease. Conclusions: Sarcopenia is a geriatric condition commonly seen in hospitalized elderly patients with coronary heart disease. Male, low BMI, and low prealbumin level were the factors related to sarcopenia for older adults with coronary heart disease.

[A cross-sectional study on the association between frailty and muscular performances in hospitalized elder patients with coronary artery disease].

Objective: To explore the association between frailty and muscle performances of hospitalized elder adults with coronary artery disease. Methods: A total of 122 hospitalized patients aged 65-85 years old with coronary artery disease from Department of Geriatrics and Cardiology, Peking Union Medical College Hospital between December 2017 and March 2018 were enrolled in the study. A comprehensive geriatric assessment was performed to evaluate existing comorbidity and geriatric syndromes of the patients. Frailty was assessed using the Clinical Fraity Scale. The patients were classified as frail and non-frail, according to the scale. Muscle performances were assessed using grip strength, gait speed, etc. Whole body and appendicular skeletal muscle mass was detected with bioelectrical impedance analysis in patients with reduced grip strength or slowed gait speed. Appendicular skeletal muscle index (ASMI) was calculated. Results: Among all subjects, 28 were with frailty (23.0%) and 94 were without (77.0%). The frail patients were older [(76.7±5.4) years vs. (72.2±5.6)years], had higher Charlson comorbidity index [2.0(1.0,2.75)vs. 1.0(0,2.0)], and higher proportion of malnutrition (14.29% vs. 1.06%), urinary incontinence (39.29% vs. 15.96%), using walking-aid (28.57% vs. 6.38%), and more kinds of taken drugs (8.1±3.0 vs. 6.6±2.7), than the non-frail patients. Prealbumin levels [(207.8±60.0)mg/L vs.(234.3±45.4)mg/L] were lower, and highly sensitive C-reactive protein levels [(5.89±9.57)mg/L vs.(1.89±2.49)mg/L] were higher in the frail patients than in the non-frail patients (all P<0.05). Compared with non-frail patients, the frail patients had poorer grip strength [(19.67±7)kg vs.(29.23±8.29)kg] and slower gait speed [(0.54±0.2)m/s vs.(0.91±0.22)m/s] (all P<0.001). Spearman rank correlation analyses showed that grip strength was positively correlated with the appendicular skeletal muscle mass(r=0.811), whole body skeletal muscle mass(r=0.74) and the ASMI (r=0.783), respectively. Conclusions: The incidence of frailty among hospitalized older adults with coronary artery disease is high. Poor muscle performances were common in these patients. Assessment of frailty and muscle performances can help to evaluate the overall function of older adults with cardiovascular disease in a comprehensive way.

[Effect of comprehensive intervention on hypertension control program in workplaces in China].

Objective: To evaluate the effect of comprehensive intervention program on hypertension control in workplaces in China. Methods: The study design was a non-randomized controlled trial. First, 20 sub-centers were selected across China, then hypertension patients in 2-4 workplaces were selected as the intervention group, and hypertension patients in 1 comparable workplace selected, as the control group in each sub-center. The comprehensive intervention strategy which integrating workplace primary prevention of cardiovascular diseases and standardized management of hypertension was adopted in the intervention group for at least 2 years. Patients in the control group continued their usual health care, and only baseline data and 2-year data was collected. Analyses were conducted for hypertension patients in 30 stated-owned enterprises (SOEs), including 20 for the intervention group and 10 for the control group. The primary outcome was the control rate ofhypertension while the intervention effect (IE) was estimated by using the formula: differential value of intervention group[rate (mean)]-differential value of control group[rate (mean)]. Results: Overall, 2 622 patients completed the 2-year follow-up, of which 2 055 were in the intervention group and 567 in the control group, respectively. After 2 years of intervention, the IE on the level of SBP and DBP for intervention group and control group were-7.5 and-3.9 mmHg, respectively (P<0.05). BMI decreased by 0.4 kg/m(2), with the regular exercise rate as 36.4% and alcohol consumption rate decreased by 14.0%, respectively (P<0.05). The smoking rate decreased by 6.1% (P>0.05). The overall hypertension control rate was 25.0%, and further subgroup analysis showed that our intervention program was particularly effective for those with high education level (27.6%), white-collar employees (41.9%), and those from SOEs whose affiliated hospital had been separated away (41.9%). Conclusion: The comprehensive intervention program could greatly improve the hypertension control in the workplaces in China.

[A Meta-analysis of sublingual immunotherapy in the treatment of seasonal allergic rhinitis].

Objective:To systematically evaluate the efficacy and adverse reactions of sublingual immunotherapy for patients with seasonal allergic rhinitis.Method:Literature databases including PubMed, Embase, Cochrane Library, Medline, CBM, Wanfang, CNKI. The time of literature search was limited from January of 2008 to December of 2017.The literature of randomized controlled trials of sublingual immunotherapy for seasonal allergic rhinitis was screened,the quality of the included literature was evaluated,data was extracted,and meta-analysis was performed using RevMan5.3 software.Result:A total of 10 articles were included. The results of meta-analysis showed that for seasonal allergic rhinitis sublingual immunotherapy compared with the control group can reduce symptom scores （SMD=-0.30, 95%CI［-0.39,-0.21］,P<0.000 01) and medication scores (SMD=-0.18, 95%CI［-0.29，-0.08］, P=0.000 8); sublingual immunotherapy for seasonal allergic rhinitis is not restricted by age in the relief of symptoms, and there is no age restriction on reduce medication requirements; sublingual immunotherapy had a higher incidence of adverse reactions than the control group, but it was mostly localized, such as oral pruritus, ear pruritus, throat irritation.Conclusion:Sublingual immunotherapy can alleviate the symptoms and reduce medication requirements in patients with seasonal allergic rhinitis. The adverse reactions are slightly controllable.

[Nasal irrigation with different concentrations of saline as an adjunctive treatment in allergic rhinitis:A systematic review and Meta-analysis].

Objective:To compare the clinical efficacy of different concentrations of saline irrigation in adjuncative treatment of allergic rhinitis by Meta-analysis. Method:According to the inclusion and exclusion criteria, the studies using random controlled trials were retrieved from the Pubmed, Web of science, The Cochrane Library, Embase et al. The Mata-analysis was performed by using RevMan 5.3 software. Result:In total, 1 457 patients were enrolled in 14 randomized controlled trials, including 739 in the isotonic saline group, 350 in the hypertonic saline group,Times New Roman 368 without saline irragation. The results of Meta-analysis showed that the VAS score of saline irrigation group was lower than no saline irrigation group［95%CI (-1.57, -0.15), P=0.02］, the nasal RQLQ score was lower［95%CI (-3.93, -0.43), P=0.01］, and the effective rate was higher［95%CI(1.15, 1.45), P<0.01］; The score of nasal symptoms and signs in hypertonic saline group was lower than that in normal saline group［95%CI(-1.68, -0.63), P<0.01］, and the effective rate was higher［95%CI(1.19, 1.47), P<0.01］. There were significant differences between the two groups. Conclusion:The efficacy of saline irrigation as an adjunctive treatment in allergic rhinitis is significant. The effect of hypertonic saline irrigation was better than that of isotonic saline.

[The clinical efficacy of vidian neurectomy and conservative treatment on moderate-severe allergic rhinitis: a Meta-analysis].

Objective: To compare the clinical effects of vidian neurectomy with conservative management in the treatment for moderate-severe allergic rhinitis. Method: The studies using case controlled trials which were retrieved from Embase, Pubmed, Web of Science, Cochrane Library etc. The Cochrane risk assessment criteria were used to evaluate the quality of the articles that met the inclusion criteria. Manager 5.3 software was used to data analysis. Result: Six articles were included in meta-analysis. Meta-analysis showed that vidian neurectomy group got lower RQLQ scoresï¼»95%CI (-0.98,-0.63),P<0.001ï¼½, less inCIdence of complicationsï¼»95%CI (0.17, 0.67), P=0.002ï¼½, lower VAS scoreï¼»95%CI (-3.97,-3.65), P<0.001ï¼½and higher clinically effective ratioï¼»95%CI (1.18, 50.52), P=0.03ï¼½than conservative treatment group. Conclusion:In summary, we believe that nasal endoscopic vidian neurectomy in the treatment of moderate-severe allergic rhinitis is superior to conservative treatment.

The study on pathological mechanism and solution method for spinal cord ischemia reperfusion injury.

OBJECTIVE: We aimed at investigating the pathological mechanism changing of injury during reperfusion injury, reperfusion time correlation and compliance, finding the blood supply and improving the secondary damage. MATERIALS AND METHODS: A total of 180 patients who underwent a surgical procedure and that received normal saline intraperitoneally immediately after the patients' aortic occlusions were investigated. Patients were divided in three groups. Experimental conditions and programs were designed for various approaches. RESULTS: Thirty min after the onset of ischemia, we found a decrease in the local blood flow in the lumbar spinal cord, almost -77.48% of the baseline, which was reversed partially by initial reperfusion, even exceeding the baseline level. However, 1 hour after reperfusion, the blood flow was again decreased to the level below the baseline, followed by a decline to 207.13% ± 38.25 PU for 3 h without any recovery. Attenuating this secondary damage with neuroprotective strategies requires an understanding of these pathophysiologic processes. CONCLUSIONS: This study showed the pathological mechanism changes during reperfusion injury and reperfusion time correlation and compliance, and analyzed some of the important pathophysiologic processes involved in secondary damage after spinal cord injury. Moreover, our research discusses a number of pharmacologic therapies that have either been studied or have future potential for this devastating injury.

[Predictive factors of mortality in extremely preterm infants].

Objective: To investigate the predictive factors of mortality in extremely preterm infants. Methods: The retrospective case-control study was accomplished in the Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University. A total of 268 extremely preterm infants seen from January 1, 1999 to December 31, 2015 were divided into survival group (192 cases) and death group (76 cases). The potential predictive factors of mortality were identified by univariate analysis, and then analyzed by multivariate unconditional Logistic regression analysis. The mortality and predictive factors were also compared between two time periods, which were January 1, 1999 to December 31, 2007 (65 cases) and January 1, 2008 to December 31, 2015 (203 cases). Results: The median gestational age (GA) of extremely preterm infants was 27 weeks (23+3-27+6 weeks). The mortality was higher in infants with GA of 25-<26 weeks (OR=2.659, 95% CI: 1.211-5.840) and<25 weeks (OR=10.029, 95% CI: 3.266-30.792) compared to that in infants with GA> 26 weeks. From January 1, 2008 to December 31, 2015, the number of extremely preterm infants was increased significantly compared to the previous 9 years, while the mortality decreased significantly (OR=0.490, 95% CI: 0.272-0.884). Multivariate unconditional Logistic regression analysis showed that GA below 25 weeks (OR=6.033, 95% CI: 1.393-26.133), lower birth weight (OR=0.997, 95% CI: 0.995-1.000), stage Ⅲ necrotizing enterocolitis (NEC) (OR=15.907, 95% CI: 3.613-70.033), grade Ⅰ and Ⅱ intraventricular hemorrhage (IVH) (OR=0.260, 95% CI: 0.117-0.575) and dependence on invasive mechanical ventilation (OR=3.630, 95% CI: 1.111-11.867) were predictive factors of mortality in extremely preterm infants. Conclusions: GA below 25 weeks, lower birth weight, stage Ⅲ NEC and dependence on invasive mechanical ventilation are risk factors of mortality in extremely preterm infants. But grade ⅠandⅡ IVH is protective factor.

An instrument for measuring scintillators efficiently based on silicon photomultipliers.

An instrument used for measuring multiple scintillators' light output and energy resolution was developed. The instrument consisted of a light sensor array which was composed of 64 discrete SiPMs (Silicon Photomultipliers), a corresponding individual channel readout electronics system, and a data processing algorithm. A Teflon grid and a large interval between adjacent SiPMs were employed to eliminate the optical cross talk among scintillators. The scintillators' light output was obtained by comparing with a reference sample with known light output. Given the SiPM temperature dependency and the difference among each SiPM, a temperature offset correction algorithm and a non-uniformity correction algorithm were added to the instrument. A positioning algorithm, based on nine points, was designed to evaluate the performance of a scintillator array. Tests were performed to evaluate the instrument's performance. The uniformity of 64 channels for light output measurement was better than 98%, the stability was better than 98% when temperature varied from 15 °C to 40 °C, and the nonlinearity under 511 keV was better than 2%. This instrument was capable of selecting scintillators and evaluating the packaging technology of scintillator arrays with high efficiency and accuracy.

Management of Meloidogyne incognita on tomato with endophytic bacteria and fresh residue of Wasabia japonica.

AIMS: To characterize the nematicidal endophytic bacteria (NEB) of Wasabia japonica (wasabi) and evaluated the control efficacies of promising NEB as well as fresh wasabi residue (FWR) against Meloidogyne incognita on tomato. METHODS AND RESULTS: By in vitro bioassay, 53 NEB strains showing nematicidal efficacies of >50% against J2 of M. incognita were isolated from wasabi. Basing on 16S rRNA gene sequences, these NEB were identified into 18 species of 11 genera. In greenhouse, incorporation of selected NEB culture or FWR into potted soil significantly reduced infection of M. incognita on tomato. Treating tomatoes with either FWR or NEB of Raoultella terrigena RN16 and Pseudomonas reinekei SN21 in the field yielded excellent control efficacies against M. incognita, especially the combinations of FWR with either R. terrigena RN16 or Ps. reinekei SN21 at doses of 50 g plus 100 ml per plant or more. CONCLUSIONS: The results established that R. terrigena RN16 and Ps. reinekei SN21 applied separately or combined with FWR have the potential to provide bioprotection agents against M. incognita. SIGNIFICANCE AND IMPACT OF THE STUDY: This study provides novel way for disease management using combination of endophyte and host residue.

Prestin up-regulation in chronic salicylate (aspirin) administration: an implication of functional dependence of prestin expression.

Salicylate (aspirin) can reversibly eliminate outer hair cell (OHC) electromotility to induce hearing loss. Prestin is the OHC electromotility motor protein. Here we report that, consistency with increase in distortion product otoacoustic emission, long-term administration of salicylate can increase prestin expression and OHC electromotility. The prestin expression at the mRNA and protein levels was increased by three- to four-fold. In contrast to the acute inhibition, the OHC electromotility associated charge density was also increased by 18%. This incremental increase was reversible. After cessation of salicylate administration, the prestin expression returned to normal. We also found that long-term administration of salicylate did not alter cyclooxygenase (Cox) II expression but down-regulated NF-kappaB and increased nuclear transcription factors c-fos and egr-1. The data suggest that prestin expression in vivo is dynamically up-regulated to increase OHC electromotility in long-term administration of salicylate via the Cox-II-independent pathways.

Differential chemotactic potential of mouse platelet basic protein for thymocyte subsets.

Mouse platelet basic protein (CXCL7/mPBP) was cloned from thymic stromal cells and further identification indicated that it was expressed in thymic monocytes/macrophages (Mo/Mphis). Recombinant mPBP was chemoattractive for target cells of polymorphonuclear leucocytes, peritoneal Mo/Mphis and splenic lymphocytes with distinct potencies. CXCR2 was identified to be a cognate receptor for mPBP. Mouse thymocyte subsets of CD4-CD8- double-negative (DN), CD4+CD8+ double-positive (DP), CD4+CD8- single-positive (CD4SP) and CD4-CD8+ single-positive (CD8SP) expressed cell surface CXCR2 with different positive percentages and expression levels. mPBP was chemoattractive for thymocyte subsets with the potency order DN>DP> CD8SP>CD4SP, consistent with the levels of CXCR2 expressed on the respective cells. Thus, mPBP in thymus is functionally redundant with chemokine CXCL12/ SDF-1. Moreover, our finding that thymic Mo/Mphis can produce mPBP implies that they may have other functions apart from acting as scavengers in thymus.

Modeling of a rotary motor driven by an anisotropic piezoelectric composite laminate.

This paper proposes an analytical model of a rotary motor driven by an anisotropic piezoelectric composite laminate. The driving element of the motor is a three-layer laminated plate. A piezoelectric layer is sandwiched between two anti-symmetric composite laminae. Because of the material anisotropy and the anti-symmetric configuration, torsional vibration can be induced through the inplane strain actuated by the piezoelectric layer. The advantages of the motor are its magnetic field immunity, simple structure, easy maintenance, low cost, and good low-speed performance. In this paper, the motor is considered to be a coupled dynamic system. The analytical model includes the longitudinal and torsional vibrations of the laminate and the rotating motion of the rotor under action of contact forces. The analytical model can predict the overall characteristics of the motor, including the modal frequency and the response of motion of the laminate, the rotating speed of the rotor, the input power, the output power, and the efficiency of the motor. The effects of the initial compressive force, the applied voltage, the moment of rotor inertia, and the frictional coefficient of the contact interface on the characteristics of the motor are simulated and discussed. A selection of the numerical results from the analytical model is confirmed by experimental data.