Research on multi-parameter fusion non-invasive blood glucose detection method based on machine learning.

OBJECTIVE: Traditional blood glucose testing methods have several disadvantages, such as high pain and poor acquisition continuity. In response to these shortcomings, we propose a multi-parameter fusion non-invasive blood glucose detection method that combines machine learning and photoplethysmography (PPG) signal feature parameter analysis. MATERIALS AND METHODS: This method uses the signal validity check process based on the correlation operation to test and calculate PPG data. It, then, respectively applies the bootstrap aggregation algorithm and the random forests algorithm to establish two non-invasive blood glucose detection models that comprehensively predict blood glucose data. RESULTS: Experimental comparative analysis showed that the accuracy of the detection model based on the random forests algorithm is superior. The correlation coefficient of the obtained blood glucose prediction set is 0.972, the mean square error is 0.257, and the relative error is less than ± 20%. CONCLUSIONS: Relative error in blood glucose prediction meets the national standards in China. Meanwhile, the results of the Clarke Error Grid Analysis indicate that the non-invasive blood glucose testing method proposed in this study meets clinical accuracy requirements.

[Comparison of graft vessel versus native vessel strategies for late saphenous vein graft disease after coronary artery bypass grafting].

Objective: To compare clinical efficacy of interventional treatment with graft vessel and native coronary artery for patients with late saphenous vein grafts disease(SVGD) after coronary artery bypass grafting (CABG). Methods: A total of 1 608 patients underwent CABG in Tianjin Chest from March 2014 to December 2017 were screened. During the follow-up period, 165 hospitalized patients with recurrence of angina pectoris within one year after CABG, who had at least one narrow vein graft(≥50%) confirmed by the coronary angiography were enrolled. According to the results of angiography and surgeon's clinical experiences, the patients received interventional treatment to vein grafts(grafts group, n=53) or native coronary vessels(native group, n=112). The operation success rate, mortality and incidence of serious complications after interventional treatment in two groups at the time of hospitalization were compared.And the incidence of major adverse cardiovascular events(MACE) in two groups at one year after discharge were also compared. Kaplan-Meier survival curve was used to compare the cumulative event-free survival rates. The risk factors for the MACE in the patients with late SVGD and treated by interventional therapy were analyzed by Cox regression analysis. Results: A total of 165 patients were included for analysis, including 98 males(59.4%). The age was (64.2±7.1) years old. The follow-up time was 12 (8, 12) months. In the grafts group, operation success rate was 90.57%(48/53), and 3 cases(5.66%) suffered from serious complications after interventional treatment, 2 cases(3.77%) died. For native group the operation success rate was 88.39%(99/112), and 7(6.25%) cases suffered from serious complications after interventional treatment, and no deaths. The operation success rate and the incidences of serious complications after interventional treatment in two groups had no statistically significant difference(both P>0.05). The mortality in hospital of native group was lower than that in grafts group(P<0.05). Within 12 months after discharge, there was no statistically significant difference in incidence of MACE of two groups (11.32%(6/53) vs. 10.71%(12/112), P>0.05). Survival analysis showed that the cumulative event-free survival rates in two groups were 73.58% (39/53) and 66.13%(74/112), and there was no statistically significant difference (P>0.05). Cox regression analysis showed acute coronary syndrome (HR=41.203, 95%CI 4.859-349.361, P<0.01), and peripheral vascular diseases (HR=2.808, 95%CI 1.067-7.393, P<0.05) were the risk factors of the MACE for the patients treated by interventional therapy with late SVGD. Conclusion: For the patients with late SVGD after CABG, the success rate of intervention with vein grafts and own coronary vessels are both high with satisfactory safety.The in-hospital mortality of interventional therapy in own coronary vessels is lower than in graft vessel. Patients with acute coronary syndrome and peripheral vascular disease have a poor prognosis.

[Analysis of short-term and long-term clinical outcomes in patients with acute myocardial infarction after one year of coronary stent implantation].

Objective: To observe in-hospital and 1-year prognosis of patients with acute myocardial infarction after one year of coronary stent implantation. Methods: From January 2015 to February 2018, 329 patients with acute myocardial infarction (AMI) after 1 year of coronary artery stent implantation were enrolled and received coronary angiography. These patients were divided into two groups (very late stent thrombosis (VLST) group and denovo group) according to whether the occurrence of acute myocardial infarction was due to stent thrombosis (ST), and in-hospital and long-term (1 year) outcomes were compared between the two groups. The primary end points included cardiac death and recurrent acute myocardial infarction. The secondary study end points included target lesion revascularization (TLR), re-stent thrombosis, heart failure, and stroke. Results: In total, 72.9% of patients with AMI after one year of coronary stent implantation were caused by VLST. There were no significant differences of both primary and secondary end-point events between the two groups during in-hospital period (3.3% vs 3.4%, P=0.987; 5.4% vs 4.5%, P=0.956). After a mean follow-up of 1 year, there were no significant differences of the primary end-point events between the two groups. The secondary end-point events and TLR incidence were higher in the VLST group (16.3% vs 6.7%, P=0.026; 9.6% vs 2.2%, P=0.026). Kaplan and Meier survival analysis showed that there were no significant differences of the 1-year cumulative non-primary and non-secondary end-point survival rates between the two groups (P=0.124 and 0.004, respectively). COX regression analysis showed that heart function ≥Ⅲ level (Killip's) and VLST were independent predictive risk factors for end-point events, while postprocedural thrombolysis in myocardial infarction (TIMI) flow grade 3 was an independent protective factor. Conclusion: In-hospital end points show no significant differences between VLST and denovo groups patients. However, the VLST group patients have a poor prognosis and a higher proportion of TLR after 1 year follow-up. The patients with heart function ≥Ⅲ level (Killip's) or VLST have a poor prognosis, while the patients with postprocedural TIMI flow grade 3 have a good prognosis.

Expression patterns of HENMT1 and PIWIL1 in human testis: implications for transposon expression.

This study aimed to define the expression patterns of HENMT1 and PIWI proteins in human testis and investigate their association with transposon expression, infertility sub-type or development of testicular germ cell tumours (TGCTs). Testis biopsies showing normal spermatogenesis were used to identify normal localisation patterns of HENMT1 and PIWIL1 by immunolocalisation and RT-PCR after laser microdissection. 222 testis biopsies representing normal spermatogenesis, hypospermatogenesis, spermatogenic arrests, Sertoli cell-only (SCO) tumours and TGCTs were analysed by RT-qPCR for expression of HENMT1/PIWIL1/PIWIL2/PIWIL3/PIWIL4 and LINE-1 Additionally, HENMT1-overexpressing TCam2 seminoma cell lines were analysed for the same parameters by RT-qPCR. We found that HENMT1 and PIWIL1 are coexpressed in pachytene spermatocytes and spermatids. Expression of HENMT1, PIWIL1 and PIWIL2 was mainly dependent on germ cell content but low levels of expression were also detected in some SCO samples. Levels of HENMT1, PIWIL1 and PIWIL2 expression were low in TGCT. Samples with HENMT1, PIWIL2 and PIWIL4 expression showed significantly (P < 0.05) lower transposon expression compared to samples without expression in the same histological group. HENMT1-overexpressing TCam2 cells showed lower LINE-1 expression than empty vector-transfected control lines. Our findings support that the transposon-regulating function of the piRNA pathway found in the mouse is conserved in adult human testis. HENMT1 and PIWI proteins are expressed in a germ-cell-specific manner and required for transposon control.

A preliminary observation on auto-cholinergic synapse dysfunction in patients with different types of epilepsy.

Serum anti-acetylcholine receptor antibodies (A AchR Ab) and anti-synaptic premembrane antibodies (A PrM Ab) were measured in 21 patients with absence epilepsy, 21 cases with benign childhood epilepsy with centro-temporal spikes (BCECTs) and 13 cases with atypical epilepsy. Respectively, in five (23.8%), eleven (51.2%) and eight (66.7%) of the above mentioned groups of patients both A AchR Ab and A PrM Ab were found.

[Auto-cholinergic synapse dysfunction in patients with generalized epileptic seizures. A preliminary report].

The mechanism of epileptic seizures so far remains unclear. Immunological disturbances may be one of the possible mechanisms. The assumption that primary epilepsy is an autoimmune disease lacks an experimental basis. In order to search any relationship between generalized epileptic seizures and autoimmune we examined and measured the serum anti-acetylcholine receptor antibody (A AchR Ab) and anti-synaptic premembrane antibody (A PrM Ab) in 12 patients with typical absences, 20 patients with generalized tonic-clonic seizures (GTC) and 6 patients with Lennox-Gastaut Syndrome. 2 (16.7%) out of 12 patients with absences showed positive both A AchR Ab and A PrM Ab, positive A AchR Ab in 1 patient. Among 20 patients with GTC both A AchR Ab and A PrM Ab were positive in 7 patients (35%), A PrM Ab was positive in 1 patient. Totally in 8 patients A PrM Ab was positive. However, the difference between the two Antibodies was not significant (1.1:1). The two kinds of antibody were positive in 5 (83%) out of 6 patients and A PrM Ab was positive, but A AchR Ab was doubtful in another one patient with Lennox-Gastaut syndrome. Therefore, all the patients with Lennox-Gastaut syndrome showed positive antibody. Our data suggested that different types of generalized epileptic-seizures showed different severity of autoimmune dysfunction. The meaning of this kind of immune dysfunction needs further investigation.

Phenytoin: the pseudosteady-state phenomenon.

After reaching an apparent steady state, plasma phenytoin (PHT) levels may then undergo inexplicable changes, a phenomenon called " pseudosteady state". We evaluated 13 pseudosteady -state periods in 10 inpatients with complex partial seizures. Eleven of the periods occurred after a change in PHT dosage and two after drug withdrawal. The pseudosteady -state period began 2 to 12 days (means = 5.7 days) after dosage change and lasted 5 to 10 days (means = 6.3 days), during which plasma PHT levels were stable (+/- 5%). Plasma PHT levels thereafter fluctuated spontaneously by greater than 25% for 5 to 22 days (means = 10.8 days). A final steady-state level was reached 13 to 31 days (means = 21.4 days) after the first dosage change. Falling plasma PHT levels increased seizure frequency in two patients, and a level of 52 micrograms/ml led to medication toxicity in another.