Displaying all 15 publications

Abstract:
Sort:
  1. Chan BT, Ong CW, Lim E, Abu Osman NA, Al Abed A, Lovell NH, et al.
    PMID: 23367367 DOI: 10.1109/EMBC.2012.6347432
    Dilated cardiomyopathy (DCM) is a common cardiac disease which leads to the deterioration in cardiac performance. A computational fluid dynamics (CFD) approach can be used to enhance our understanding of the disease, by providing us with a detailed map of the intraventricular flow and pressure distributions. In the present work, effect of ventricular size on the intraventricular flow dynamics and intraventricular pressure gradients (IVPGs) was studied using two different implementation methods, i.e. the geometry-prescribed and the fluid structure interaction (FSI) methods. Results showed that vortex strength and IVPGs are significantly reduced in a dilated heart, leading to an increased risk of thrombus formation and impaired ventricular filling. We suggest FSI method as the ultimate method in studying ventricular dysfunction as it provides additional cardiac disease prognostic factors and more realistic model implementation.
    Matched MeSH terms: Cardiomyopathy, Dilated/physiopathology*
  2. Chan BT, Abu Osman NA, Lim E, Chee KH, Abdul Aziz YF, Abed AA, et al.
    PLoS One, 2013;8(6):e67097.
    PMID: 23825628 DOI: 10.1371/journal.pone.0067097
    Dilated cardiomyopathy (DCM) is the most common myocardial disease. It not only leads to systolic dysfunction but also diastolic deficiency. We sought to investigate the effect of idiopathic and ischemic DCM on the intraventricular fluid dynamics and myocardial wall mechanics using a 2D axisymmetrical fluid structure interaction model. In addition, we also studied the individual effect of parameters related to DCM, i.e. peak E-wave velocity, end systolic volume, wall compliance and sphericity index on several important fluid dynamics and myocardial wall mechanics variables during ventricular filling. Intraventricular fluid dynamics and myocardial wall deformation are significantly impaired under DCM conditions, being demonstrated by low vortex intensity, low flow propagation velocity, low intraventricular pressure difference (IVPD) and strain rates, and high-end diastolic pressure and wall stress. Our sensitivity analysis results showed that flow propagation velocity substantially decreases with an increase in wall stiffness, and is relatively independent of preload at low-peak E-wave velocity. Early IVPD is mainly affected by the rate of change of the early filling velocity and end systolic volume which changes the ventriculo:annular ratio. Regional strain rate, on the other hand, is significantly correlated with regional stiffness, and therefore forms a useful indicator for myocardial regional ischemia. The sensitivity analysis results enhance our understanding of the mechanisms leading to clinically observable changes in patients with DCM.
    Matched MeSH terms: Cardiomyopathy, Dilated/complications; Cardiomyopathy, Dilated/pathology*; Cardiomyopathy, Dilated/physiopathology*
  3. Sivalingam N, Anwar K, Chandran K
    Singapore Med J, 2001 Mar;42(3):122-3.
    PMID: 11405564
    Peripartal cardiomyopathy is a rare form of heart disease in pregnancy with an unpredictable outcome. We describe one patient who presented in a decompensated state who was successfully managed with medical antifailure treatment. The etiology, management and future obstetric outcome are discussed.
    Matched MeSH terms: Cardiomyopathy, Dilated/blood; Cardiomyopathy, Dilated/diagnosis*; Cardiomyopathy, Dilated/physiopathology
  4. Chan BT, Lim E, Ong CW, Abu Osman NA
    PMID: 23521137 DOI: 10.1080/10255842.2013.779683
    Despite the advancement of cardiac imaging technologies, these have traditionally been limited to global geometrical measurements. Computational fluid dynamics (CFD) has emerged as a reliable tool that provides flow field information and other variables essential for the assessment of the cardiac function. Extensive studies have shown that vortex formation and propagation during the filling phase acts as a promising indicator for the diagnosis of the cardiac health condition. Proper setting of the boundary conditions is crucial in a CFD study as they are important determinants, that affect the simulation results. In this article, the effect of different transmitral velocity profiles (parabolic and uniform profile) on the vortex formation patterns during diastole was studied in a ventricle with dilated cardiomyopathy (DCM). The resulting vortex evolution pattern using the uniform inlet velocity profile agreed with that reported in the literature, which revealed an increase in thrombus risk in a ventricle with DCM. However the application of a parabolic velocity profile at the inlet yields a deviated vortical flow pattern and overestimates the propagation velocity of the vortex ring towards the apex of the ventricle. This study highlighted that uniform inlet velocity profile should be applied in the study of the filling dynamics in a left ventricle because it produces results closer to that observed experimentally.
    Matched MeSH terms: Cardiomyopathy, Dilated/physiopathology*
  5. Chee KH
    Singapore Med J, 2013 Jan;54(1):28-31.
    PMID: 23338913
    INTRODUCTION: Peripartum cardiomyopathy (PPCM) is an uncommon form of congestive heart failure, affecting obstetric patients around the time of delivery. The epidemiology of PPCM is infrequently reported. This study was undertaken to define the prevalence, presentation and outcome of PPCM among women giving birth in a teaching hospital in Malaysia.

    METHODS: A retrospective case record analysis was conducted on all patients admitted and diagnosed with PPCM at the University Malaya Medical Centre, Kuala Lumpur, Malaysia, from 1 January 2000 to 31 December 2009. All deliveries were undertaken in the same hospital.

    RESULTS: A total of 12 patients were diagnosed with PPCM during the ten-year study period. The prevalence of PPCM was 2.48 in 100,000 (1 in 40,322) live births. Nine women were diagnosed with PPCM within five months of delivery. Three women had twin pregnancies. There was one death in the group (mortality rate 8.3%). The mean left ventricular ejection fraction at the time of diagnosis was 28.9% ± 8.5% (range 15%-40%). Following the index event, left ventricular function normalised in six of the nine patients (66.7%) who underwent subsequent echocardiography one year later. All patients were treated with standard heart failure therapy. Two patients with normalised left ventricular function had subsequent pregnancies - one pregnancy was terminated at seven weeks and the other patient delivered uneventfully at full term.

    CONCLUSION: PPCM is uncommon. The outcome in our series was favourable, with 66.7% of patients with PPCM recovering their left ventricular function. The mortality rate was 8.3%.
    Matched MeSH terms: Cardiomyopathy, Dilated/complications; Cardiomyopathy, Dilated/therapy*
  6. Dorobantu DM, Wadey CA, Amir NH, Stuart AG, Williams CA, Pieles GE
    Diagnostics (Basel), 2021 Apr 01;11(4).
    PMID: 33915862 DOI: 10.3390/diagnostics11040635
    Speckle tracking echocardiography (STE) has gained importance in the evaluation of adult inherited cardiomyopathies, but its utility in children is not well characterized. We conducted a systematic review to evaluate the role of STE in pediatric inherited cardiomyopathies. PubMed, EMBASE, Web of Science, Scopus, CENTRAL and CINAHL databases were searched up to May 2020, for terms related to inherited cardiomyopathies and STE. Included were dilated cardiomyopathy (DCM), hypertrophic cardiomyopathy (HCM), left ventricular non-compaction (LVNC) and arrhythmogenic cardiomyopathy (ACM). A total of 14 cohorts were identified, of which six were in DCM, four in HCM, three in LVNC and one in ACM. The most commonly reported STE measurements were left ventricular longitudinal strain (Sl), circumferential strain (Sc), radial strain (Sr) and rotation/torsion/twist. Sl, Sc and were abnormal in all DCM and LVNC cohorts, but not in all HCM. Apical rotation and twist/torsion were increased in HCM, and decreased in LVNC. Abnormal STE parameters were reported even in cohorts with normal non-STE systolic/diastolic measurements. STE in childhood cardiomyopathies can detect early changes which may not be associated with changes in cardiac function detectable by non-STE methods. Longitudinal and circumferential strain should be introduced in the cardiomyopathy echocardiography protocol, reflecting current practice in adults.
    Matched MeSH terms: Cardiomyopathy, Dilated
  7. Chin SP, Poey AC, Wong CY, Chang SK, Tan CS, Ng MT, et al.
    Cytotherapy, 2011 Aug;13(7):814-21.
    PMID: 21526902 DOI: 10.3109/14653249.2011.574118
    BACKGROUND AIMS: Mesenchymal stromal cells (MSC) may improve cardiac function following myocardial infarction. MSC can differentiate into cardiomyocytes and endothelial cells while exerting additional paracrine effects. There is limited information regarding the efficacy of route for MSC treatment of severe dilated cardiomyopathy (DCM). The aim of this study was to demonstrate the clinical safety, feasibility and efficacy of direct intramyocardial and intracoronary administration of autologous bone marrow-derived MSC treatment for no-option patients with chronic severe refractory DCM.

    METHODS: Ten symptomatic patients with DCM and refractory cardiac function, despite maximum medical therapy, were selected. Five had ischemic DCM deemed unlikely to benefit from revascularization alone and underwent bypass operations with concurrent intramyocardial MSC injection (group A). Two patients had previous revascularization and three had non-ischemic DCM and received intracoronary MSC injection (group B).

    RESULTS: Group A and B patients received 0.5-1.0 × 10(6) and 2.0-3.0 × 10(6) MSC/kg body weight, respectively. All patients remained alive at 1 year. There were significant improvements from baseline to 6 and 12 months in left ventricular ejection fraction and other left ventricular parameters. Scar reduction was noted in six patients by 12 months.

    CONCLUSIONS: Autologous bone marrow MSC treatment is safe and feasible for treating chronic severe refractory DCM effectively, via intracoronary or direct intramyocardial administration at prescribed doses.

    Matched MeSH terms: Cardiomyopathy, Dilated/therapy*
  8. Jeyamalar R, Chan SP
    Int J Cardiol, 1995 Nov 10;52(1):83-4.
    PMID: 8707441
    Thyrotoxicosis gives rise to a high output cardiac failure. Rarely, it can cause a dilated cardiomyopathy with severe impairment of myocardial function which improves significantly following treatment.
    Matched MeSH terms: Cardiomyopathy, Dilated/etiology*
  9. Chin SP, Poey AC, Wong CY, Chang SK, Teh W, Mohr TJ, et al.
    Cytotherapy, 2010;12(1):31-7.
    PMID: 19878080 DOI: 10.3109/14653240903313966
    Bone marrow (BM) mesenchymal stromal cells (MSC) represent a novel therapy for severe heart failure with extensive myocardial scarring, especially when performed concurrently with conventional revascularization. However, stem cells are difficult to transport in culture media without risk of contamination, infection and reduced viability. We tested the feasibility and safety of off-site MSC culture and expansion with freeze-controlled cryopreservation and subsequent rapid thawing of cells immediately prior to implantation to treat severe dilated ischemic cardiomyopathy.
    Matched MeSH terms: Cardiomyopathy, Dilated/etiology; Cardiomyopathy, Dilated/physiopathology; Cardiomyopathy, Dilated/therapy*
  10. Oemar, Hamed, Abdulgani, Hafil Budianto
    Medical Health Reviews, 2008;2008(1):17-28.
    MyJurnal
    Heart failure (HF) is a major burden in almost all countries. The prevalence of symptomatic HF is still high. Despite our best understanding of its pathophysiologic mechanisms and the recent advances in pharmacologic therapy, it remains a highmortality and morbidity disease. About 30-50% of patients with HF have concurrent electrical delay in the electrocardiogram (ECG), mainly in the form of LBBB.1 This kind of conduction delay commonly occurs in patients with idiopathic dilated cardiomyopathy and ischemic cardiomyopathy as well. The abnormality of left ventricle (LV) conduction will lead to a change in LV contraction pattern resulting dyssynchronized with right ventricle) contraction. Thus, a dyssynchronous LV contractile pattern usually manifested by late activation of the LV lateral wall which in turn impairs LV systolic function, reduces cardiac output, raises filling pressure and worsens mitral regurgitation2. Cardiac resynchronization therapy (CRT) improves cardiac function and exercise capacity leading to an improved survival in patients with advanced heart failure and ventricular conduction delay.3 The underlying mechanisms of these beneficial effects are not fully understood, but they appear to be related to a restored coordination of the left (LV) and right ventricular (RV) contraction and relaxation.4 These effects may directly lead to augmented contractility and reduction of LV filling pressures.5 Echocardiography has been widely used to identify patients who are candidates for CRT and to monitor the response in LV function at follow-up after device implantation. This review addresses the applications of CRT in patients with moderate– severe heart failure and the role of echocardiography in optimizing CRT including patient selection, risk and benefit of CRT and appropriate measures.
    Matched MeSH terms: Cardiomyopathy, Dilated
  11. Chan BT, Lim E, Chee KH, Abu Osman NA
    Comput Biol Med, 2013 May;43(4):377-85.
    PMID: 23428371 DOI: 10.1016/j.compbiomed.2013.01.013
    The heart is a sophisticated functional organ that plays a crucial role in the blood circulatory system. Hemodynamics within the heart chamber can be indicative of exert cardiac health. Due to the limitations of current cardiac imaging modalities, computational fluid dynamics (CFD) have been widely used for the purposes of cardiac function assessment and heart disease diagnosis, as they provide detailed insights into the cardiac flow field. An understanding of ventricular hemodynamics and pathological severities can be gained through studies that employ the CFD method. In this research the hemodynamics of two common myocardial diseases, dilated cardiomyopathy (DCM) and myocardial infarction (MI) were investigated, during both the filling phase and the whole cardiac cycle, through a prescribed geometry and fluid structure interaction (FSI) approach. The results of the research indicated that early stage disease identification and the improvement of cardiac assisting devices and therapeutic procedures can be facilitated through the use of the CFD method.
    Matched MeSH terms: Cardiomyopathy, Dilated/pathology*
  12. Yap WF, Chong HC
    Int J Rheum Dis, 2020 Nov;23(11):1568-1573.
    PMID: 32969582 DOI: 10.1111/1756-185X.13965
    FBN1 gene encodes for the connective tissue protein fibrillin-1 which can also regulate the profibrotic cytokine transforming growth factor (TGF)-ß1. Mutations in the FBN1 gene cause Marfan syndrome (MFS), a genetic condition with defective connective tissues. FBN1 haplotypes and single nucleotide polymorphisms have also been reported to be associated with systemic sclerosis (SSc), a connective tissue disease characterized by fibrosis of multiple organs. Furthermore, the duplication of the Fbn1 gene causes a SSc-like disease in the TsK1 mouse model. To the best of our knowledge, there are no reports of MFS and SSc co-existing in a patient. Here, we describe a 46-year-old woman who presented with cardiac failure. She had a family history of MFS. Physical examination revealed marfanoid habitus and scleroderma features. Echocardiography demonstrated dilated cardiomyopathy with aortic root dilatation, aortic regurgitation and mitral regurgitation. Cardiac magnetic resonance imaging was consistent with dilated cardiomyopathy, mid-wall fibrosis at basal septal wall and dilated aortic root. Extractable nuclear antigen panel detected anti-Scl 70. She fulfilled Ghent criteria for MFS and satisfied American College of Rheumatology/ European League Against Rheumatism classification criteria for SSc. Although we do not have the FBN1 sequence in our patient, the co-existence of MFS and SSc in this patient raises the possibility of co-existence of distinct mutations in the FBN1 gene that could affect TGF-β signaling differently, resulting in divergent pathologic consequences - loss of structural integrity in MFS versus increased extracellular matrix deposition in SSc, and different clinical manifestations.
    Matched MeSH terms: Cardiomyopathy, Dilated/etiology
  13. Tan F, Thai AC, Cheah WK, Mukherjee JJ
    South. Med. J., 2009 Oct;102(10):1068-70.
    PMID: 19738530 DOI: 10.1097/SMJ.0b013e3181b571e6
    A 45-year-old woman with poorly controlled hypertension and diabetes mellitus presented with left iliac fossa pain, constipation alternating with diarrhea, and weight loss. She had been diagnosed with idiopathic cardiomyopathy five years previously. Echocardiogram had shown a left ventricular ejection fraction (LVEF) of 35%; coronary angiogram was normal. Colonoscopy revealed sigmoid colitis with stenosis. Abdominal computed tomography revealed a 5 cm right adrenal tumor. Twenty-four hour urinary free catecholamines and fractionated metanephrine excretion values were elevated, confirming pheochromocytoma. Her colitis resolved after one month of adrenergic blockade. Repeat echocardiogram showed improvement of LVEF to 65%. After laparoscopic right adrenalectomy, the patient's hypertension resolved, and diabetic control improved. Timely management avoided further morbidity and potential mortality in our patient.
    Matched MeSH terms: Cardiomyopathy, Dilated/complications
  14. Bonsu KO, Owusu IK, Buabeng KO, Reidpath DD, Kadirvelu A
    J Am Heart Assoc, 2017 Apr 01;6(4).
    PMID: 28365564 DOI: 10.1161/JAHA.116.004706
    BACKGROUND: Randomized control trials of statins have not demonstrated significant benefits in outcomes of heart failure (HF). However, randomized control trials may not always be generalizable. The aim was to determine whether statin and statin type-lipophilic or -hydrophilic improve long-term outcomes in Africans with HF.

    METHODS AND RESULTS: This was a retrospective longitudinal study of HF patients aged ≥18 years hospitalized at a tertiary healthcare center between January 1, 2009 and December 31, 2013 in Ghana. Patients were eligible if they were discharged from first admission for HF (index admission) and followed up to time of all-cause, cardiovascular, and HF mortality or end of study. Multivariable time-dependent Cox model and inverse-probability-of-treatment weighting of marginal structural model were used to estimate associations between statin treatment and outcomes. Adjusted hazard ratios were also estimated for lipophilic and hydrophilic statin compared with no statin use. The study included 1488 patients (mean age 60.3±14.2 years) with 9306 person-years of observation. Using the time-dependent Cox model, the 5-year adjusted hazard ratios with 95% CI for statin treatment on all-cause, cardiovascular, and HF mortality were 0.68 (0.55-0.83), 0.67 (0.54-0.82), and 0.63 (0.51-0.79), respectively. Use of inverse-probability-of-treatment weighting resulted in estimates of 0.79 (0.65-0.96), 0.77 (0.63-0.96), and 0.77 (0.61-0.95) for statin treatment on all-cause, cardiovascular, and HF mortality, respectively, compared with no statin use.

    CONCLUSIONS: Among Africans with HF, statin treatment was associated with significant reduction in mortality.

    Matched MeSH terms: Cardiomyopathy, Dilated/epidemiology
Filters
Contact Us

Please provide feedback to Administrator (afdal@afpm.org.my)

External Links