Displaying publications 161 - 180 of 5549 in total

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  1. Chaturvedi A, Rao G, Praharaj SK, Guruprasad KP, Pais V
    Alcohol Alcohol, 2020 Jun 25;55(4):391-394.
    PMID: 32363396 DOI: 10.1093/alcalc/agaa033
    AIM: Chronic alcohol consumption can activate and dysregulate the neuroimmune system which leads to neuroinflammation. Neuroimmune regulatory proteins (NIReg) (e.g. Cluster of Differentiation 200 (CD200)) are the regulators of innate immune response and are responsible for silencing the innate immunity and suppression of inflammation. In this study, we explored the changes of serum levels of CD200 in patients with alcohol dependence at baseline, after one-week alcohol withdrawal and after one-month of alcohol abstinence.

    METHODS: Seventeen patients with alcohol dependence admitted for de-addiction treatment and 12 healthy controls were enrolled in the study. Blood samples were collected at baseline, after one-week, and after one-month, and CD200 levels were measured using enzyme-linked immunosorbent assay kit and compared with the healthy controls.

    RESULTS: The serum level of the neuroimmune regulatory protein CD200 in alcohol dependent group (at baseline) was significantly lower compared to healthy controls (p=0.003), and increased after one-week, and one-month period.

    CONCLUSION: The present study indicates that decrease of CD200 serum levels in alcohol dependent patients and its rise during alcohol withdrawal and abstinence may provide a preliminary evidence of the role of neuroimmune regulatory proteins in neuroadaptation during alcohol withdrawal.

    Matched MeSH terms: Alcoholism/blood*; Antigens, CD/blood*
  2. Mohd Zain R, Shaiful Bahrin NI, Ellan K, Thayan R
    Malays J Pathol, 2021 Dec;43(3):463-464.
    PMID: 34958069
    No abstract available.
    Matched MeSH terms: Antibodies, Viral/blood*; Immunoglobulin G/blood*
  3. Yunos MFAM, Manczak R, Guines C, Mansor AFM, Mak WC, Khan S, et al.
    Biosensors (Basel), 2021 Dec 03;11(12).
    PMID: 34940251 DOI: 10.3390/bios11120494
    Diabetes has become a major health problem in society. Invasive glucometers, although precise, only provide discrete measurements at specific times and are unsuitable for long-term monitoring due to the injuries caused on skin and the prohibitive cost of disposables. Remote, continuous, self-monitoring of blood sugar levels allows for active and better management of diabetics. In this work, we present a radio frequency (RF) sensor based on a stepped impedance resonator for remote blood glucose monitoring. When placed on top of a human hand, this RF interdigital sensor allows detection of variation in blood sugar levels by monitoring the changes in the dielectric constant of the material underneath. The designed stepped impedance resonator operates at 3.528 GHz with a Q factor of 1455. A microfluidic device structure that imitates the blood veins in the human hand was fabricated in PDMS to validate that the sensor can measure changes in glucose concentrations. To test the RF sensor, glucose solutions with concentrations ranging from 0 to 240 mg/dL were injected into the fluidic channels and placed underneath the RF sensor. The shifts in the resonance frequencies of the RF sensor were measured using a network analyzer via its S11 parameters. Based on the change in resonance frequencies, the sensitivity of the biosensor was found to be 264.2 kHz/mg·dL-1 and its LOD was calculated to be 29.89 mg/dL.
    Matched MeSH terms: Blood Glucose*; Blood Glucose Self-Monitoring
  4. Tsan SEH, Viknaswaran NL, Cheong CC, Cheah S, Ng KT, Mong SXY, et al.
    Anaesthesia, 2023 Sep;78(9):1153-1161.
    PMID: 37314744 DOI: 10.1111/anae.16058
    Tranexamic acid is an antifibrinolytic drug that is widely used during surgery, but there are concerns about its thromboembolic effects. We aimed to investigate the effect of prophylactic intravenous tranexamic acid on thromboembolic outcomes in patients undergoing non-cardiac surgery. The MEDLINE, EMBASE and Cochrane Central Register of Controlled Trials were searched. Randomised controlled trials comparing intravenous tranexamic acid with placebo or no treatment in patients undergoing non-cardiac surgery were included. The primary outcome was a composite of peri-operative cardiovascular thromboembolic events, defined as any deep vein thrombosis, pulmonary embolism, myocardial ischaemia/infarction or cerebral ischaemia/infarction. A total of 191 randomised controlled trials (40,621 patients) were included in the review. The primary outcome occurred in 4.5% of patients receiving intravenous tranexamic acid compared with 4.9% of patients in the control group. Our analysis showed that there was no difference between groups for composite cardiovascular thromboembolic events (risk ratio 1.02, 95%CI 0.94-1.11, p = 0.65, I2 0%, n = 37,512). This finding remained robust when sensitivity analysis was performed with continuity correction and in studies with a low risk of bias. However, in trial sequential analysis, our meta-analysis only achieved 64.6% of the required information size. There was no association between intravenous tranexamic acid and seizure rate or mortality rate within 30 days. Intravenous tranexamic acid was associated with a reduced blood transfusion rate compared with control (9.9% vs. 19.4%, risk ratio 0.46, 95%CI 0.41-0.51, p 
    Matched MeSH terms: Blood Transfusion; Blood Loss, Surgical/prevention & control
  5. Sakthiswary R, Rajalingam S, Norazman MR, Hussein H
    Clin Ter, 2015;166(2):e98-101.
    PMID: 25945451 DOI: 10.7417/CT.2015.1827
    OBJECTIVE: The etiology of recurrent pregnancy loss (RPL) is unknown in a significant proportion of patients. Autoimmune processes have been implicated in the pathogenesis. The role of antinuclear antibody (ANA) in this context is largely undetermined. In an attempt to address the lack of evidence in this area, we explored the clinical significance of antinuclear antibody (ANA) in unexplained RPL.
    MATERIALS AND METHODS: We studied 68 patients with RPL and 60 healthy controls from September 2005 to May 2012. All subjects were tested for ANA by immunofluorescence testing, and a titer of 1: 80 and above was considered positive. We compared the pregnancy outcome between the ANA positive and ANA negative RPL cases.
    RESULTS: The incidence of ANA positivity among the cases (35.3%) was significantly higher than the controls (13.3%) (p=0.005). ANA positive cases showed significantly higher number of RPL (p=0.006) and lower number of successful pregnancies (p=0.013) compared to the ANA negative cases . The ANA titre had a significant association with the number of RPL (p<0.05, r=0.724) but not with the number of successful pregnancies (p=0.054).
    CONCLUSIONS: ANA positivity predicts a less favorable pregnancy outcome in RPL. Our findings suggest that the ANA titre is a useful positive predictor of the number of RPL. Hence, ANA test is a potential prognostic tool for this condition which merits further research.
    Matched MeSH terms: Abortion, Habitual/blood*; Antibodies, Antinuclear/blood*
  6. Teoh ST, Hussain S, Hong JYH
    J ASEAN Fed Endocr Soc, 2022;37(2):49-59.
    PMID: 36578892 DOI: 10.15605/jafes.037.02.08
    OBJECTIVES: This study described and compared glycaemic changes with the use of the following Continuous Glucose Monitoring (CGM) metrics: time in range, time in hyperglycaemia and time in hypoglycaemia from retrospective CGM data among children and adolescents with Type 1 Diabetes Mellitus (T1DM), before and during Ramadan to better understand the impact of fasting during this season.

    METHODOLOGY: This study was conducted in 2 tertiary centres: Hospital Putrajaya (HPJ) and Hospital Universiti Sains Malaysia (HUSM) from February to May 2020. Muslim T1DM patients between ages 8 to18 who intended to fast during Ramadan were given Ramadan-focused education. CGM iPro2® (Medtronic) was used before and during Ramadan, complemented by finger-prick glucose monitoring or self-monitoring of blood glucose (SMBG).

    RESULTS: Of the 32 patients, only 24 (12 female) were analysed. Mean age was 13.6 ± 3.1 years old, mean HbAlc was 9.6 ± 1.9% and mean duration of illness was 5.4 ± 3.4 years. Majority (91.7%) were on multiple dose injections (MDI) while only 8.3% were on continuous subcutaneous insulin infusion (CSII). All fasted in Ramadan without acute complications. Retrospective CGM analysis revealed similar results in time in range (TIR), time in hyperglycaemia and time in hypoglycaemia before and during Ramadan, indicating no increased hypoglycaemic or hyperglycaemic events related to fasting. Glycaemic variability before Ramadan as measured by the LBGI, HBGI and MAG, were similar to values during Ramadan.

    CONCLUSION: Ramadan fasting among T1DM children and adolescents, by itself, is not associated with short-term glycaemic deterioration. T1DM youths can fast safely in Ramadan with the provision of focused education and regular SMBG.

    Matched MeSH terms: Blood Glucose; Blood Glucose Self-Monitoring/methods
  7. Zakaria MS, Ismail F, Tamagawa M, Aziz AFA, Wiriadidjaja S, Basri AA, et al.
    Med Biol Eng Comput, 2017 Sep;55(9):1519-1548.
    PMID: 28744828 DOI: 10.1007/s11517-017-1688-9
    Even though the mechanical heart valve (MHV) has been used routinely in clinical practice for over 60 years, the occurrence of serious complications such as blood clotting remains to be elucidated. This paper reviews the progress that has been made over the years in terms of numerical simulation method and the contribution of abnormal flow toward blood clotting from MHVs in the aortic position. It is believed that this review would likely be of interest to some readers in various disciplines, such as engineers, scientists, mathematicians and surgeons, to understand the phenomenon of blood clotting in MHVs through computational fluid dynamics.
    Matched MeSH terms: Blood Coagulation/physiology*; Blood Flow Velocity/physiology
  8. Islam M, Mohamed EH, Esa E, Kamaluddin NR, Zain SM, Yusoff YM, et al.
    Br. J. Cancer, 2017 Nov 07;117(10):1551-1556.
    PMID: 28898234 DOI: 10.1038/bjc.2017.316
    BACKGROUND: Although aberrant expression of cytokines and small molecules (analytes) is well documented in acute myeloid leukaemia (AML), their co-expression patterns are not yet identified. In addition, plasma baselines for some analytes that are biomarkers for other cancers have not been previously reported in AML.

    METHODS: We used multiplex array technology to simultaneously detect and quantify 32 plasma analyte (22 reported analytes and 10 novel analytes) levels in 38 patients.

    RESULTS: In our study, 16 analytes are found to be significantly deregulated (13 higher, 3 lower, Mann-Whitney U-test, P-value <0.005), where 5 of them have never been reported before in AML. We predicted a seven-analyte-containing multiplex panel for diagnosis of AML and, among them, MIF could be a possible therapeutic target. In addition, we observed that circulating analytes show five co-expression signatures.

    CONCLUSIONS: Circulating analyte expression in AML significantly differs from normal, and follow distinct expression patterns.

    Matched MeSH terms: Biomarkers, Tumor/blood*; Leukemia, Myeloid, Acute/blood*; Cytokines/blood*
  9. Ahadon M, Abdul Aziz S, Wong CL, Leong CF
    Malays J Pathol, 2018 Apr;40(1):41-48.
    PMID: 29704383 MyJurnal
    INTRODUCTION: Microparticles are membrane bound vesicles, measuring less than 1.0 um, which are released during cellular activation or during apoptosis. Studies have shown that these circulating microparticles play a role in coagulation, cell signaling and cellular interactions. Increased levels of circulating microparticles have been observed in a number of conditions where there is vascular dysfunction, thrombosis and inflammation. The objective of this study was to determine the various plasma-derived microparticles in patients with polycythaemia vera (PV) in Universiti Kebangsaan Malaysia Medical Centre and to compare them with normal control.

    METHODS: A total of 15 patients with PV and 15 healthy volunteers were included in this cross-sectional descriptive study. Plasma samples from both patients and healthy volunteers were prepared and further processed for isolation of microparticles. Flow cytometry analyses were then carried out in all samples to determine the cellular origin of the microparticles. Full blood count parameters for both groups were also collected. Data collected were analyzed using SPSS version 12.0.

    RESULTS: Patients with PV had a significantly higher percentage of platelet derived microparticles compared to healthy controls (P <0.05). The control group had a higher level of endothelial derived microparticles but the differences were not statistically significant (P > 0.05).

    CONCLUSION: The median percentage of positive events for platelet derived microparticles was higher in patients with PV compared to normal healthy controls.

    Matched MeSH terms: Blood Platelets/pathology; Polycythemia Vera/blood*
  10. Nadaraja RND, Sthaneshwar P, Razali N
    Malays J Pathol, 2018 Apr;40(1):33-39.
    PMID: 29704382 MyJurnal
    INTRODUCTION: Hyperandrogenism remains as one of the key features in Polycystic Ovarian Syndrome (PCOS) and can be assessed clinically or determined by biochemical assays. Hirsutism is the most common clinical manifestation of hyperandrogenism. The clinical assessment is subjected to wide variability due to poor interobserver agreement and multiple population factors such as ethnic variation, cosmetic procedures and genetic trait. The difficulty in resolving the androgen excess biochemically is due to a lack of consensus as to which serum androgen should be measured for the diagnosis of PCOS. The aim of the study was to compare and establish the diagnostic cut off value for different androgen biomarker for the diagnosis of PCOS.

    MATERIALS AND METHODS: A total of 312 patients classified to PCOS (n = 164) and non PCOS (n = 148) cohorts were selected from the Laboratory Information System (LIS) based on serum total testosterone (TT) and sex hormone binding globulin (SHBG) from the period of 1st April 2015 to 31st March 2016. PCOS was diagnosed based on Rotterdam criteria. Clinical hyperandrogenism and ultrasound polycystic ovarian morphology were obtained from the clinical records. The other relevant biochemical results such as serum luteinizing hormone (LH), follicle stimulating hormone (FSH) and albumin were also obtained from LIS. Free androgen index (FAI), calculated free testosterone (cFT) and calculated bioavailable testosterone (cBT) were calculated for these patients. Receiver Operating Characteristic (ROC) curve analysis were performed for serum TT, SHBG, FAI, cFT, cBT and LH: FSH ratio to determine the best marker to diagnose PCOS.

    RESULTS: All the androgen parameters (except SHBG) were significantly higher in PCOS patients than in control (p<0.0001). The highest area under curve (AUC) curve was found for cBT followed by cFT and FAI. TT and LH: FSH ratio recorded a lower AUC and the lowest AUC was seen for SHBG. cBT at a cut off value of 0.86 nmol/L had the highest specificity, 83% and positive likelihood ratio (LR) at 3.79. This is followed by FAI at a cut off value of 7.1% with specificity at 82% and cFT at a cut off value of 0.8 pmol/L with specificity at 80%. All three calculated androgen indices (FAI, cFT and cBT) showed good correlation with each other. Furthermore, cFT, FAI and calculated BT were shown to be more specific with higher positive likelihood ratio than measured androgen markers.

    CONCLUSIONS: Based on our study, the calculated testosterone indices such as FAI, cBT and cFT are useful markers to distinguish PCOS from non-PCOS. Owing to ease of calculation, FAI can be incorporated in LIS and can be reported with TT and SHBG. This will be helpful for clinician to diagnose hyperandrogenism in PCOS.

    Matched MeSH terms: Androgens/blood*; Polycystic Ovary Syndrome/blood*; Biomarkers/blood*
  11. Passmore MR, Obonyo NG, Byrne L, Boon AC, Diab SD, Dunster KR, et al.
    Thromb Res, 2019 Apr;176:39-45.
    PMID: 30776686 DOI: 10.1016/j.thromres.2019.02.015
    INTRODUCTION: Fluid resuscitation is a cornerstone of severe sepsis management, however there are many uncertainties surrounding the type and volume of fluid that is administered. The entire spectrum of coagulopathies can be seen in sepsis, from asymptomatic aberrations to fulminant disseminated intravascular coagulation (DIC). The aim of this study was to determine if fluid resuscitation with saline contributes to the haemostatic derangements in an ovine model of endotoxemic shock.

    MATERIALS AND METHODS: Twenty-one adult female sheep were randomly divided into no endotoxemia (n = 5) or endotoxemia groups (n = 16) with an escalating dose of lipopolysaccharide (LPS) up to 4 μg/kg/h administered to achieve a mean arterial pressure below 60 mmHg. Endotoxemia sheep received either no bolus fluid resuscitation (n = 8) or a 0.9% saline bolus (40 mL/kg over 60 min) (n = 8). No endotoxemia, saline only animals (n = 5) underwent fluid resuscitation with a 0.9% bolus of saline as detailed above. Hemodynamic support with vasopressors was initiated if needed, to maintain a mean arterial pressure (MAP) of 60-65 mm Hg in all the groups.

    RESULTS: Rotational thromboelastometry (ROTEM®) and conventional coagulation biomarker tests demonstrated sepsis induced derangements to secondary haemostasis. This effect was exacerbated by saline fluid resuscitation, with low pH (p = 0.036), delayed clot initiation and formation together with deficiencies in naturally occurring anti-coagulants antithrombin (p = 0.027) and Protein C (p = 0.001).

    CONCLUSIONS: Endotoxemia impairs secondary haemostasis and induces changes in the intrinsic, extrinsic and anti-coagulant pathways. These changes to haemostasis are exacerbated following resuscitation with 0.9% saline, a commonly used crystalloid in clinical settings.

    Matched MeSH terms: Blood Pressure/drug effects; Endotoxemia/blood
  12. Norazlina Hamzah, Faraizah Abd. Karim, Ahzad Hadi Ahmad, Narazah Mohd Yusoff
    MyJurnal
    Photochemical treatment is one of the pathogen inactivation method to treat plasma, part of a proactive approach used for blood and blood component safety. Three photochemical treatments that have been used were methylene blue, riboflavin and psoralen treatment. This study was done on Fresh Frozen Plasma (FFP) to evaluate the treatment effects of psoralen, methylene blue and riboflavin on coagulation factors level. Methods: FFP was collected from apheresis plasma units and kept at 22oC to 24oC. A sum of 90 apheresis plasma units and segments were used, separated from each bag and a part used as controls, placed in a -30oC freezer for storage, thawed, and coagulation proteins function was evaluated before and after treatment, at immediate, 30 days and 270 days storage. Results: Significant differences in fibrinogen and coagulation factor levels between before and after treatment with methylene blue, psoralen and riboflavin. However, most of the mean values in treated plasma were within reference ranges. Methylene blue treated FFP showed the lowest changes in fibrinogen and other coagulation factors level whilst riboflavin treated FFP demonstrated the highest changes in coagulation proteins concentrations especially for fibrinogen, FV, FVIII, FIX and FXII. However, FXIII showed the best recovery for all three photochemical methods with reduction level of 3% to 8% compared to pre-treatment. Storage time comparison of immediate, 30 days and 270 days was inconclusive. Conclusion: The coagulation proteins in psoralen treated FFP and MB-FFP were adequately preserved, where MB-FFP showed better preservation than other two photochemical treatments.
    Matched MeSH terms: Blood Coagulation Factors; Blood Component Removal; Blood Component Transfusion; Blood Safety
  13. Sahibin Abd. Rahim, Tukimat Lihan, Zulfahmi Ali Rahman, Wan Mohd. Razi Idris, Azman Hashim, Sharilnizam M. Yusof, et al.
    Sains Malaysiana, 2007;36:9-13.
    Kandungan logam berat Fe, Cu dan Mn dalam tanih serta tumbuhan Nepenthes sp yang diambil daripada kawasan bekas lombong bijih timah dan besi di Lombong Pelepah Kanan, Kota Tinggi, Johor telah dikaji. Kandungan logam berat telah ditentukan di dalam empat bahagian tumbuhan Nepenthes sp. iaitu di dalam akar, batang, daun dan periuk. Sebanyak 15 sampel tumbuhan Nepenthes sp dan tanih dikumpul untuk dianalisis. Komposisi logam-logam berat dalam sampel tanih diekstrak dengan menggunakan campuran asid nitrik dan asid perklorik. Kandungan logam berat dalam tumbuhan pula diekstrak melalui kaedah penghadaman basah. Kandungan logam berat di dalam larutan ekstrak tanih dan tumbuhan ditentukan dengan menggunakan alat Spektrofotometer Serapan Atom Kaedah Nyalaan (FAAS). Nilai Koefisien Penyerapan Biologi (BAC) dikira sebagai nisbah kandungan logam berat dalam tumbuhan kepada kandungan logam berat dalam tanih. Analisis tanih menunjukkan kawasan bekas lombong didominasi oleh pasir dan bersifat asid. Ia juga mempunyai kandungan bahan organik dan nilai kekonduksian elektrik yang rendah. Logam Fe mencatatkan kepekatan purata paling tinggi di dalam tanih diikuti oleh Mn dan Cu. Tumbuhan Nepenthes sp boleh dijadikan sebagai pengumpul biologi untuk logam Fe kerana nilai BACnya adalah tinggi.
    Matched MeSH terms: Blood Proteins
  14. Allen GV, MacGregor RGS
    Matched MeSH terms: Blood Grouping and Crossmatching
  15. See CK, Turnbull D, Ritson F, Martin S, Tully P, Wittert G
    JBI Database System Rev Implement Rep, 2019 09;17(9):1894-1900.
    PMID: 30925504 DOI: 10.11124/JBISRIR-2017-004035
    OBJECTIVE: The objective of this review is to examine the association between serum testosterone concentration and the presence and severity of depression in men.

    INTRODUCTION: Cross-sectional and longitudinal cohort studies examining the relationship between serum testosterone concentration and depression in men have produced mixed results. There has not, however, been any prior attempt to systematically interrogate the data. Clarification of the relationship has clinical importance because depression may be under-diagnosed in men.

    INCLUSION CRITERIA: This review will consider studies involving community-dwelling men who are not receiving testosterone replacement therapy. The exposure of interest reviewed will include endogenous testosterone concentration measured through validated assays. Studies measuring total and testosterone fraction concentration will be included. This review will include studies with depression or incident depression outcomes as defined by either clinical diagnosis of depression or validated self-administered questionnaire assessing depression symptomatology.

    METHODS: This review will follow the JBI approach for systematic reviews of etiology and risk. The following sources will be searched: PubMed, PsycINFO, Embase, the Cochrane Central Register of Controlled Trials, Australian New Zealand Clinical Trials Registry and the ISRCTN Registry. Analytical observational studies including prospective and retrospective cohort studies, case control studies and analytical cross-sectional studies published in English or other languages with English translation will be considered. Retrieval of full-text studies, assessment of methodological quality and data extraction will be performed independently by two reviewers. Data will be pooled in statistical meta-analysis, where possible.

    SYSTEMATIC REVIEW REGISTRATION NUMBER: PROSPERO CRD42018108273.

    Matched MeSH terms: Depression/blood*; Testosterone/blood*; Biomarkers/blood
  16. Polunin I, Sneah PHA
    Matched MeSH terms: Blood Group Antigens
  17. Colás AE, Curet LB
    Biol Reprod, 1978 Apr;18(3):434-40.
    PMID: 149570
    Matched MeSH terms: Androstenedione/blood*; Dehydroepiandrosterone/blood*; Testosterone/blood*
  18. Chow YW, Pietranico R, Mukerji A
    Biochem Biophys Res Commun, 1975 Oct 27;66(4):1424-31.
    PMID: 6
    Matched MeSH terms: Cobalt/blood; Iron/blood; Oxygen/blood*
  19. Panda S, Mishra L, Arbildo-Vega HI, Lapinska B, Lukomska-Szymanska M, Khijmatgar S, et al.
    Cells, 2020 10 07;9(10).
    PMID: 33036462 DOI: 10.3390/cells9102241
    The use of autologous platelet concentrates (APCs) in regenerative endodontic procedures is inconsistent and unclear. The aim of this meta-analysis was to evaluate the effectiveness of autologous platelet concentrates compared to traditional blood-clot regeneration for the management of young, immature, necrotic, permanent teeth. The digital databases MEDLINE, SCOPUS, CENTRAL, Web of Science, and EMBASE were searched to identify ten randomized clinical trials. The outcomes at postoperative follow-up, such as dentinal wall thickness (DWT), increase in root length (RL), calcific barrier formation (CB), apical closure (AC), vitality response (VR), and success rate (SR), were subjected to both qualitative synthesis and quantitative meta-analysis. The meta-analysis showed that APCs significantly improved apical closure (risk ratio (RR) = 1.17; 95% CI: 1.01, 1.37; p = 0.04) and response to vitality pulp tests (RR = 1.61; 95% CI: 1.03, 2.52; p = 0.04), whereas no significant effect was observed on root lengthening, dentin wall thickness, or success rate of immature, necrotic teeth treated with regenerative endodontics. APCs could be beneficial when treating young, immature, necrotic, permanent teeth regarding better apical closure and improved response to vitality tests.
    Matched MeSH terms: Blood Platelets/metabolism; Blood Transfusion, Autologous/methods
  20. Chowdhury MH, Shuzan MNI, Chowdhury MEH, Mahbub ZB, Uddin MM, Khandakar A, et al.
    Sensors (Basel), 2020 Jun 01;20(11).
    PMID: 32492902 DOI: 10.3390/s20113127
    Hypertension is a potentially unsafe health ailment, which can be indicated directly from the blood pressure (BP). Hypertension always leads to other health complications. Continuous monitoring of BP is very important; however, cuff-based BP measurements are discrete and uncomfortable to the user. To address this need, a cuff-less, continuous, and noninvasive BP measurement system is proposed using the photoplethysmograph (PPG) signal and demographic features using machine learning (ML) algorithms. PPG signals were acquired from 219 subjects, which undergo preprocessing and feature extraction steps. Time, frequency, and time-frequency domain features were extracted from the PPG and their derivative signals. Feature selection techniques were used to reduce the computational complexity and to decrease the chance of over-fitting the ML algorithms. The features were then used to train and evaluate ML algorithms. The best regression models were selected for systolic BP (SBP) and diastolic BP (DBP) estimation individually. Gaussian process regression (GPR) along with the ReliefF feature selection algorithm outperforms other algorithms in estimating SBP and DBP with a root mean square error (RMSE) of 6.74 and 3.59, respectively. This ML model can be implemented in hardware systems to continuously monitor BP and avoid any critical health conditions due to sudden changes.
    Matched MeSH terms: Blood Pressure*; Blood Pressure Determination*
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