Displaying publications 1 - 20 of 1892 in total

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  1. Fulltext Manifold absolute pressure estimation using neural network with hybrid training algorithm
    Muslim MT, Selamat H, Alimin AJ, Haniff MF
    PLoS One, 2017;12(11):e0188553.
    PMID: 29190779 DOI: 10.1371/journal.pone.0188553
    In a modern small gasoline engine fuel injection system, the load of the engine is estimated based on the measurement of the manifold absolute pressure (MAP) sensor, which took place in the intake manifold. This paper present a more economical approach on estimating the MAP by using only the measurements of the throttle position and engine speed, resulting in lower implementation cost. The estimation was done via two-stage multilayer feed-forward neural network by combining Levenberg-Marquardt (LM) algorithm, Bayesian Regularization (BR) algorithm and Particle Swarm Optimization (PSO) algorithm. Based on the results found in 20 runs, the second variant of the hybrid algorithm yields a better network performance than the first variant of hybrid algorithm, LM, LM with BR and PSO by estimating the MAP closely to the simulated MAP values. By using a valid experimental training data, the estimator network that trained with the second variant of the hybrid algorithm showed the best performance among other algorithms when used in an actual retrofit fuel injection system (RFIS). The performance of the estimator was also validated in steady-state and transient condition by showing a closer MAP estimation to the actual value.
    Matched MeSH terms: Pressure*
  2. Fulltext Office blood pressure measurement: A comprehensive review
    Siddique S, Hameed Khan A, Shahab H, Zhang YQ, Chin Tay J, Buranakitjaroen P, et al.
    J Clin Hypertens (Greenwich), 2021 03;23(3):440-449.
    PMID: 33420745 DOI: 10.1111/jch.14169
    The conventional auscultatory methods for measuring blood pressure have been used to screen, diagnose, and manage hypertension since long. However, these have been found to be prone to errors especially the white coat phenomena which cause falsely high blood pressure readings. The Mercury sphygmomanometer and the Aneroid variety are no longer recommended by WHO for varying reasons. The Oscillometric devices are now recommended with preference for the Automated Office Blood Pressure measurement device which was found to have readings nearest to the Awake Ambulatory Blood Pressure readings. The downside for this device is the cost barrier. The alternative is to use the simple oscillometric device, which is much cheaper, with the rest and isolation criteria of the SPRINT study. This too may be difficult due to space constraints and the post-clinic blood measurement is a new concept worth further exploration.
    Matched MeSH terms: Blood Pressure; Blood Pressure Determination; Blood Pressure Monitoring, Ambulatory*
  3. The Manley ventilator: slipped toggle switch (click mechanism)
    Liew RP
    Med J Malaysia, 1974 Mar;28(3):185-6.
    PMID: 4278346
    Matched MeSH terms: Intermittent Positive-Pressure Breathing/instrumentation*; Positive-Pressure Respiration/instrumentation*
  4. Highly-sensitive graphene-based flexible pressure sensor platform
    Muhammad Aniq Shazni, Lee MW, Lee HW
    Sains Malaysiana, 2017;46:1155-1161.
    In this work, graphene has been utilized as the sensing material for the development of a highly-sensitive flexible pressure sensor platform. It has been demonstrated that a graphene-based pressure sensor platform that is able to measure pressure change of up to 3 psi with a sensitivity of 0.042 psi-1 and a non-linearity of less than 1% has been accomplished. The developed device, which resides on a flexible platform, will be applicable for integration in continuous wearables health-care monitoring system for the measurement of blood pressure.
    Matched MeSH terms: Blood Pressure; Blood Pressure Determination; Pressure
  5. Fulltext Current status of ambulatory blood pressure monitoring in Asian countries: A report from the HOPE Asia Network
    Shin J, Kario K, Chia YC, Turana Y, Chen CH, Buranakitjaroen P, et al.
    J Clin Hypertens (Greenwich), 2020 03;22(3):384-390.
    PMID: 31696632 DOI: 10.1111/jch.13724
    Ambulatory blood pressure monitoring (ABPM) can measure 24-hour blood pressure (BP), including nocturnal BP and diurnal variations. This feature of ABPM could be of value in Asian populations for preventing cardiovascular events. However, no study has yet investigated regarding the use of ABPM in actual clinical settings in Asian countries/regions. In this study, 11 experts from 11 countries/regions were asked to answer questionnaires regarding the use of ABPM. We found that its use was very limited in primary care settings and almost exclusively available in referral settings. The indications of ABPM in actual clinical settings were largely similar to those of home BP monitoring (HBPM), that is, diagnosis of white-coat or masked hypertension and more accurate BP measurement for borderline clinic BP. Other interesting indications, such as nighttime BP patterns, including non-dipper BP, morning BP surge, and BP variability, were hardly adopted in daily clinical practice. The use of ABPM as treatment guidance for detecting treated but uncontrolled hypertension in the Asian countries/regions didn't seem to be common. The barrier to the use of ABPM was primarily its availability; in referral centers, patient reluctance owing to discomfort or sleep disturbance was the most frequent barrier. ABPM use was significantly more economical when it was reimbursed by public insurance. To facilitate ABPM use, more simplified indications and protocols to minimize discomfort should be sought. For the time being, HBPM could be a reasonable alternative.
    Matched MeSH terms: Blood Pressure; Blood Pressure Determination; Blood Pressure Monitoring, Ambulatory
  6. Fulltext Diversity of and initiatives for hypertension management in Asia-Why we need the HOPE Asia Network
    Kario K, Chia YC, Sukonthasarn A, Turana Y, Shin J, Chen CH, et al.
    J Clin Hypertens (Greenwich), 2020 03;22(3):331-343.
    PMID: 31773883 DOI: 10.1111/jch.13733
    The Hypertension Cardiovascular Outcome Prevention and Evidence in Asia (HOPE Asia) Network was set up to improve the management of hypertension in Asia with the ultimate goal of achieving "zero" cardiovascular events. Asia is a diverse continent, and the prevalence of hypertension has increased over the last 30 years. There are a number of Asia-specific features of hypertension and hypertension-related cardiovascular complications, which means that a region-specific approach is needed. White-coat hypertension will become more of an issue over time as Asian populations age, and masked hypertension is more prevalent in Asian than in Western countries. Identifying and treating masked hypertension is important to reduce cardiovascular risk. Abnormal patterns of blood pressure (BP) variability common in Asia include exaggerated early morning BP surge and nocturnal hypertension. These are also important cardiovascular risk factors that need to be managed. Home blood pressure monitoring (HBPM) is an important tool for detecting white-coat and masked hypertension, and monitoring BP variability, and practices in Asia are variable. Use of HBPM is important given the Asia-specific features of hypertension, and strategies are needed to improve and standardize HBPM usage. Development of HBPM devices capable of measuring nocturnal BP along with other information and communication technology-based strategies are key developments in the widespread implementation of anticipation medicine strategies to detect and prevent cardiovascular events in patients with hypertension. Region-wide differences in hypertension prevalence, control, and management practices in Asia highlight the importance of information sharing to facilitate best practices.
    Matched MeSH terms: Blood Pressure; Blood Pressure Determination; Blood Pressure Monitoring, Ambulatory
  7. Fulltext Target blood pressure and control status in Asia
    Chia YC, Kario K, Turana Y, Nailes J, Tay JC, Siddique S, et al.
    J Clin Hypertens (Greenwich), 2020 03;22(3):344-350.
    PMID: 31742891 DOI: 10.1111/jch.13714
    It is widely accepted that hypertension constitutes a significant cardiovascular risk factor and that treating high blood pressure (BP) effectively reduces cardiovascular risk. An important issue in Asia is not just the high prevalence of hypertension, particularly in some countries, but also the low level of awareness and treatment rates in many regions. The 2017 update of the American College of Cardiology/American Heart Association hypertension guidelines raised the question about which BP threshold should be used to diagnose and treat hypertension. Although there is a theoretical rationale for a stricter BP criterion in Asia given the ethnic-specific features of hypertension in the region, the majority of countries in Asia have retained a diagnostic BP threshold of ≥140/90 mm Hg. Although lowering thresholds might make theoretical sense, this would increase the prevalence of hypertension and also markedly reduce BP control rates. In addition, there are currently no data from robust randomized clinical trials of the benefits of the lower targets in preventing cardiovascular disease and reducing cardiovascular risk, particularly in high-risk patients and especially for Asian populations. There is also no defined home BP treatment target level for an office BP treatment target of 130/80 mm Hg. However, in this regard, in the interim, lifestyle modifications, including reducing body weight and salt intake, should form an important part of hypertension management strategies in Asia, while studies on treating at lower BP threshold level in Asians and getting to lower BP targets will be helpful to inform and optimize the management of hypertension in the region.
    Matched MeSH terms: Blood Pressure; Blood Pressure Determination; Blood Pressure Monitoring, Ambulatory*
  8. Endocrine hypertension--current understanding and comprehensive management review
    Sukor N
    Eur J Intern Med, 2011 Oct;22(5):433-40.
    PMID: 21925049 DOI: 10.1016/j.ejim.2011.05.004
    Hypertension is a very common disease, leading to significant morbidity with reduction in quality of life. In addition to being a major cause of morbidity and mortality, hypertension places a heavy burden on health care systems, families, and society as a whole. In patients with hypertension, the ability to identify a contributing or secondary cause that is potentially curable or amenable to specific forms of management is of great importance. Endocrine hypertension has emerged as one of the common forms of secondary hypertension. Primary aldosteronism, pheochromocytoma and Cushing's syndrome are among the common causes of endocrine hypertension. The application of new clinical, biochemical, and radiologic approaches has significantly advanced our understanding of the pathophysiology and clinical spectrum of these diseases and improved the management strategies of these challenging conditions.
    Matched MeSH terms: Blood Pressure/physiology*
  9. Fulltext Clinical significance of nocturnal home blood pressure monitoring and nocturnal hypertension in Asia
    Fujiwara T, Hoshide S, Tomitani N, Cheng HM, Soenarta AA, Turana Y, et al.
    J Clin Hypertens (Greenwich), 2021 03;23(3):457-466.
    PMID: 33591641 DOI: 10.1111/jch.14218
    Nocturnal home blood pressure (BP) monitoring has been used in clinical practice for ~20 years. The authors recently showed that nocturnal systolic BP (SBP) measured by a home BP monitoring (HBPM) device in a Japanese general practice population was a significant predictor of incident cardiovascular disease (CVD) events, independent of office and morning home SBP levels, and that masked nocturnal hypertension obtained by HBPM (defined as nocturnal home BP ≥ 120/70 mmHg and average morning and evening BP 
    Matched MeSH terms: Blood Pressure; Blood Pressure Monitoring, Ambulatory
  10. Fulltext Characteristics and control of the 24-hour ambulatory blood pressure in patients with metabolic syndrome
    Huang JF, Li Y, Shin J, Chia YC, Sukonthasarn A, Turana Y, et al.
    J Clin Hypertens (Greenwich), 2021 03;23(3):450-456.
    PMID: 33629806 DOI: 10.1111/jch.14229
    Asian countries are facing an increasing prevalence of metabolic syndrome (MetS), which may aggravate the burden of cardiovascular diseases in this region. MetS is closely associated with ambulatory blood pressure (BP). Patients with MetS, compared to those without, had a twofold higher risk of new-onset office, home, or ambulatory hypertension. Furthermore, the risk of new-onset MetS in patients with white-coat, masked and sustained hypertension was also doubled compared to normotensives. High-risk masked hypertension and blunted nighttime BP dipping are common in patients with MetS, suggesting perfect 24-hour BP control with long-acting antihypertensive drugs and early initiation of combination therapy might be especially important for patients with MetS.
    Matched MeSH terms: Blood Pressure; Blood Pressure Monitoring, Ambulatory
  11. Intensive blood pressure-lowering strategy should also be offered to older patients
    Kow CS, Hasan SS
    J Hypertens, 2021 04 01;39(4):812-813.
    PMID: 33649284 DOI: 10.1097/HJH.0000000000002778
    Matched MeSH terms: Blood Pressure/drug effects
  12. Fulltext Effects of qigong on systolic and diastolic blood pressure lowering: a systematic review with meta-analysis and trial sequential analysis
    Ching SM, Mokshashri NR, Kannan MM, Lee KW, Sallahuddin NA, Ng JX, et al.
    BMC Complement Med Ther, 2021 Jan 06;21(1):8.
    PMID: 33407414 DOI: 10.1186/s12906-020-03172-3
    BACKGROUND: The benefits of qigong for systolic and diastolic blood pressure (BP) reduction have been noted in previously published systematic reviews; however, the data on its effectiveness has been at best scarce. We aimed to update the evidence of qigong on blood pressure reduction after taking into consideration the risks of random error and reliability of data in the cumulative meta-analysis using trial sequential analysis (TSA).

    METHODS: Included trials were assessed using Cochrane risk of bias instrument. We performed meta-analysis with random-effects model and random errors were evaluated with TSA. We performed the search for the eligible randomized controlled trial (RCT) through Medline, Cinahl, Cochrane Central Register of Controlled Trials and also PubMed.

    RESULTS: A total of 370 subjects sourced from seven eligible RCTs were entered into the analysis. The pooled results demonstrated the significant reduction with the use of qigong of the systolic blood pressure [weighted mean difference (WMD), - 10.66 mmHg (95% confidence interval (CI) = - 17.69,-3.62, p 

    Matched MeSH terms: Blood Pressure*
  13. Fulltext Supercritical fluid extraction of bioactive flavonoid from Strobilanthes crispus (pecah kaca) and its comparison with solvent extraction
    Liza, M.S., Abdul Rahman, R., Mandana, B., Jinap, S., Rahmat, A., Zaidul, I.S.M., et al.
    International Food Research Journal, 2012;19(2):503-508.
    MyJurnal
    Supercritical carbon dioxide extraction (SC-CO2) of bioactive flavonoid from Strobilanthes crispus (Pecah Kaca) was performed to study the effects of various parameters such as pressure, temperature and dynamic extraction time on the yield and composition of bioactive flavonoid. The results were also compared with those obtained by conventional Soxhlet extraction in lab conditions. The results from SFE showed that the effect of extraction variables on extraction yields decreased in the following order: pressure, temperature and dynamic extraction time. The extraction pressure played a dominant role in the yield of the sample while the effect of time could be ignored. This study also revealed that both Soxhlet extraction and SC-CO2 extraction can be used to obtain flavonoid compound. Under the optimum conditions, the highest bioactive flavonoid compound content was obtained at 3.98% and eight flavonoid compounds were identified by HPLC.
    Matched MeSH terms: Chromatography, High Pressure Liquid; Pressure
  14. Fulltext Standing Up for Frailty: Blood Pressure Changes Do Matter
    Tan MP
    J Am Heart Assoc, 2020 04 07;9(7):e016222.
    PMID: 32223391 DOI: 10.1161/JAHA.120.016222
    Matched MeSH terms: Blood Pressure; Blood Pressure Determination
  15. Fulltext A Shallow U-Net Architecture for Reliably Predicting Blood Pressure (BP) from Photoplethysmogram (PPG) and Electrocardiogram (ECG) Signals
    Mahmud S, Ibtehaz N, Khandakar A, Tahir AM, Rahman T, Islam KR, et al.
    Sensors (Basel), 2022 Jan 25;22(3).
    PMID: 35161664 DOI: 10.3390/s22030919
    Cardiovascular diseases are the most common causes of death around the world. To detect and treat heart-related diseases, continuous blood pressure (BP) monitoring along with many other parameters are required. Several invasive and non-invasive methods have been developed for this purpose. Most existing methods used in hospitals for continuous monitoring of BP are invasive. On the contrary, cuff-based BP monitoring methods, which can predict systolic blood pressure (SBP) and diastolic blood pressure (DBP), cannot be used for continuous monitoring. Several studies attempted to predict BP from non-invasively collectible signals such as photoplethysmograms (PPG) and electrocardiograms (ECG), which can be used for continuous monitoring. In this study, we explored the applicability of autoencoders in predicting BP from PPG and ECG signals. The investigation was carried out on 12,000 instances of 942 patients of the MIMIC-II dataset, and it was found that a very shallow, one-dimensional autoencoder can extract the relevant features to predict the SBP and DBP with state-of-the-art performance on a very large dataset. An independent test set from a portion of the MIMIC-II dataset provided a mean absolute error (MAE) of 2.333 and 0.713 for SBP and DBP, respectively. On an external dataset of 40 subjects, the model trained on the MIMIC-II dataset provided an MAE of 2.728 and 1.166 for SBP and DBP, respectively. For both the cases, the results met British Hypertension Society (BHS) Grade A and surpassed the studies from the current literature.
    Matched MeSH terms: Blood Pressure; Blood Pressure Determination
  16. Fulltext The variability of blood pressure following repeated measurements
    Singh HJ, Singh R, Sirisinghe RG, Upadaya S
    Med J Malaysia, 1991 Dec;46(4):356-62.
    PMID: 1840445
    Two series of Blood Pressure (BP) measurements were carried out to assess the variability in BP following repeated measurements in normotensive individuals. In one series, measurement of BP on three occasions three and seven days apart revealed a significant drop in BP in unaccustomed subjects ('untrained'). In a second series assessing the significance of time-interval between measurements or the number of measurements, it was found that a significant fall in BP occurred over the first four days in 'untrained' individuals, whose blood pressure was measured repeatedly for five consecutive days. A significant positive correlation was evident between the falls in systolic and diastolic pressures and the pressure at first screening. Assessment of the anxiety status revealed a significantly lower state anxiety in 'trained' subjects. It therefore appears that (a) BP in normotensive individuals previously unaccustomed to BP measurements, drops significantly with repeated measurements, (b) the number of measurements seem more important than the time-interval between measurements, (c) the largest falls occur in individuals with high initial pressures and (d) the fall upon repeated measurements may be due to reduced anxiety as familiarity with the procedure makes the subjects comparatively relaxed and less state anxious.
    Matched MeSH terms: Blood Pressure*; Blood Pressure Determination
  17. Fulltext N95 respirator associated pressure ulcer amongst COVID-19 health care workers
    Lam UN, Md Mydin Siddik NSF, Mohd Yussof SJ, Ibrahim S
    Int Wound J, 2020 Oct;17(5):1525-1527.
    PMID: 32397010 DOI: 10.1111/iwj.13398
    Matched MeSH terms: Pressure Ulcer/etiology*; Pressure Ulcer/therapy*
  18. Fulltext 2020 Consensus summary on the management of hypertension in Asia from the HOPE Asia Network
    Kario K, Park S, Chia YC, Sukonthasarn A, Turana Y, Shin J, et al.
    J Clin Hypertens (Greenwich), 2020 03;22(3):351-362.
    PMID: 31816164 DOI: 10.1111/jch.13751
    Hypertension professionals from Asia have been meeting together for the last decade to discuss how to improve the management of hypertension. Based on these education and research activities, the Hypertension, brain, cardiovascular and renal Outcome Prevention and Evidence in Asia (HOPE Asia) Network was officially established in June 2018 and includes experts from 12 countries/regions across Asia. Among the numerous research and review papers published by members of the HOPE Asia Network since 2017, publications in three key areas provide important guidance on the management of hypertension in Asia. This article highlights key consensus documents, which relate to the Asian characteristics of hypertension, home blood pressure monitoring (HBPM), and ambulatory blood pressure monitoring (ABPM). Hypertension and hypertension-related diseases are common in Asia, and their characteristics differ from those in other populations. It is essential that these are taken into consideration to provide the best opportunity for achieving "perfect 24-hour blood pressure control", guided by out-of-office (home and ambulatory) blood pressure monitoring. These region-specific consensus documents should contribute to optimizing individual and population-based hypertension management strategies in Asian country. In addition, the HOPE Asia Network model provides a good example of the local interpretation, modification, and dissemination of international best practice to benefit specific populations.
    Matched MeSH terms: Blood Pressure; Blood Pressure Monitoring, Ambulatory*
  19. Self-measured bed-time, arising and day blood pressures of normotensive young male and female adults
    Wai, Nyunt, Thing, Sze Wei, Liing, Ting Ngiik
    International e-Journal of Science, Medicine & Education, 2011;5(1):31-33.
    MyJurnal
    Morning surge in blood pressure is an independent cardiovascular risk factor in the middleaged and the elderly. Whether such a surge occurs in young subjects is not known. Eighty normotensive subjects (age: 21.8 ± 1.3 yr) measured their own blood pressure (BP) using an automatic device (Omron HEM-7080,) on going to bed and on waking up, for 2 consecutive days. In contrast to large morning BP surges reported for older age groups, there was much smaller but significant (P
    Matched MeSH terms: Blood Pressure; Blood Pressure Determination; Blood Pressure Monitoring, Ambulatory
  20. Fulltext A Biomechanical Comparison between Taylor's Spatial Frame and Ilizarov External Fixator
    Tan B, Shanmugam R, Gunalan R, Chua Y, Hossain G, Saw A
    Malays Orthop J, 2014 Jul;8(2):35-9.
    PMID: 25279090 DOI: 10.5704/MOJ.1407.012
    Taylor's spatial frame (TSF) and Ilizarov external fixators (IEF) are two circular external fixator commonly used to address complex deformity and fractures. There is currently no data available comparing the biomechanical properties of these two external fixators. This study looks into the mechanical characteristics of each system. TSF rings with 6 oblique struts, 4 tube connectors, 4 threaded rods, and 6 threaded rods were compared to a standard IEF rings with 4 threaded rods. Compression and torsional loading was performed to the frame as well as construct with Polyvinylchloride tubes. TSF rings with 4 tube connectors had the highest stiffness (3288 N/mm) while TSF rings with 6 struts was the least stiff. The situation was reversed for torsion where TSF rings with 6 oblique struts had the highest torsional stiffness (82.01 Nm/Degree) and frame Ilizarov rings with 4 threaded rods the least. Standard TSF construct of two ring with 6 oblique struts have better torsional stiffness and lower axial stiffness compared to the standard IEF.
    Matched MeSH terms: Pressure
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