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  • Open Access

    ARTICLE

    Novel mutation of GATA4 gene in Kurdish population of Iran with nonsyndromic congenital heart septals defects

    Fariborz Soheili1,2, Zahra Jalili3, Mahtab Rahbar4, Zahed Khatooni1, Amir Mashayekhi5, Hossein Jafari6

    Congenital Heart Disease, Vol.13, No.2, pp. 295-304, 2018, DOI:10.1111/chd.12571

    Abstract Background: The mutations in GATA4 gene induce inherited atrial and ventricular septation defects, which is the most frequent forms of congenital heart defects (CHDs) constituting about half of all cases.
    Method: We have performed High resolution melting (HRM) mutation scanning of GATA4 coding exons of nonsyndrome 100 patients as a case group including 39 atrial septal defects (ASD), 57 ventricular septal defects (VSD) and four patients with both above defects and 50 healthy individuals as a control group. Our samples are categorized according to their HRM graph. The genome sequencing has been done for 15 control samples and 25 samples… More >

  • Open Access

    REVIEW

    Five decades of the Fontan operation: A systematic review of international reports on outcomes after univentricular palliation

    Laura S. Kverneland1,2, Peter Kramer2, Stanislav Ovroutski2

    Congenital Heart Disease, Vol.13, No.2, pp. 181-193, 2018, DOI:10.1111/chd.12570

    Abstract Almost fifty years after its first clinical application, the modified Fontan operation is among the most frequently performed procedures in congenital heart disease surgery in children today. The objective of this review is to systematically summarize the international evolution of outcomes in regard to morbidity and mortality of patients with Fontan palliation. All studies published over the past five decades with more than 100 Fontan patients included were screened. In eligible studies, information concerning preoperative patients’ characteristics, Fontan modifications employed, early mortality, long-term survival and frequency of relevant complications was extracted. Ultimately, thirty-one studies published by the largest surgical centers… More >

  • Open Access

    ARTICLE

    Analytical Study on the Rate of Sound Transmission Loss in Single Row Honeycomb Sandwich Panel Using a Numerical Method

    Rohollah Fallah Madvari1, Mohammad Reza Monazzam2, Mohsen Niknam Sharak3, Mohsen Mosa Farkhani4,*

    Sound & Vibration, Vol.54, No.2, pp. 127-137, 2020, DOI:10.32604/sv.2020.08158

    Abstract Honeycomb structures have recently, replaced with conventional homogeneous materials. Given the fact that sandwich panels containing a honeycomb core are able to adjust geometric parameters, including internal angles, they are suitable for acoustic control applications. The main objective of this study was to obtain a transmission loss curve in a specific honeycomb frequency range along with same overall dimensions and weight. In this study, a finite element model (FEM) in ABAQUS software was used to simulate honeycomb panels, evaluate resonant frequencies, and for acoustic analysis. This model was used to obtain acoustic pressure and then to calculate the sound transmission… More >

  • Open Access

    ARTICLE

    The Applications of Order Reduction Methods in Nonlinear Dynamic Systems

    Nan Wu1,#, Kuan Lu1,2,#,*, Yulin Jin2,3,*, Haopeng Zhang1, Yushu Chen2

    Sound & Vibration, Vol.54, No.2, pp. 113-125, 2020, DOI:10.32604/sv.2020.09783

    Abstract Two different order reduction methods of the deterministic and stochastic systems are discussed in this paper. First, the transient proper orthogonal decomposition (T-POD) method is introduced based on the high-dimensional nonlinear dynamic system. The optimal order reduction conditions of the T-POD method are provided by analyzing the rotor-bearing system with pedestal looseness fault at both ends. The efficiency of the T-POD method is verified via comparing with the results of the original system. Second, the polynomial dimensional decomposition (PDD) method is applied to the 2 DOFs spring system considering the uncertain stiffness to study the amplitude-frequency response. The numerical results… More >

  • Open Access

    ARTICLE

    Using Audiometric Data to Weigh and Prioritize Factors that Affect Workers’ Hearing Loss through Support Vector Machine (SVM) Algorithm

    Hossein ElahiShirvan1, MohammadReza Ghotbi-Ravandi2, Sajad Zare3,*, Mostafa Ghazizadeh Ahsaee4

    Sound & Vibration, Vol.54, No.2, pp. 99-112, 2020, DOI:10.32604/sv.2020.08839

    Abstract Workers’ exposure to excessive noise is a big universal work-related challenges. One of the major consequences of exposure to noise is permanent or transient hearing loss. The current study sought to utilize audiometric data to weigh and prioritize the factors affecting workers’ hearing loss based using the Support Vector Machine (SVM) algorithm. This cross sectional-descriptive study was conducted in 2017 in a mining industry in southeast Iran. The participating workers (n = 150) were divided into three groups of 50 based on the sound pressure level to which they were exposed (two experimental groups and one control group). Audiometric tests… More >

  • Open Access

    ARTICLE

    Effect of Input Waveform to Vibration Speaker on Sound Quality of Electric Artificial Voice

    T. Asakura*, K. Shindo

    Sound & Vibration, Vol.54, No.2, pp. 85-98, 2020, DOI:10.32604/sv.2020.08119

    Abstract A number of studies have been conducted on the improvement of the sound quality of electrical artificial laryngeal speech, the speech produced has been difficult to hear compared to a natural voice. For this reason, it is necessary to effectively improve the frequency characteristics of the input signal. In the present study, to improve the sound quality of vocalization using an electrical artifi- cial larynx, first, a comparison of the frequency characteristics between the real and artificial voices was conducted, and three filters that can make the frequency characteristics of the artificial voice closer to those of a real voice… More >

  • Open Access

    ARTICLE

    Fixture Modifications for Effective Control of an Electrodynamic 3D-Shaker System

    Kurthan Kersch1,*, Elmar Woschke2

    Sound & Vibration, Vol.54, No.2, pp. 75-84, 2020, DOI:10.32604/sv.2020.08909

    Abstract This work aims to improve the setup of an electrodynamic triaxial shaker prototype with respect to its usability for the automotive industry. Triaxial shakers being capable of meeting the corresponding requirements are not available as standard test equipment. Modifications on the fixture have to be conducted in order to ensure an effective control. The first part of the work is the qualitative description of the system behavior. Therefore, the shaker is treated as a black box. The second part is the modification of the test fixture in order to handle the resonances of the shaker, which is elementary for its… More >

  • Open Access

    ARTICLE

    Right ventricular contractile reserve in tetralogy of Fallot patients with pulmonary regurgitation

    Clotilde Kingsley1, Saad Ahmad2, John Pappachan1, Sujata Khambekar1, Thomas Smith1, Diane Gardiner1, James Shambrook1, Shankar Baskar3, Ryan Moore3, Gruschen Veldtman3

    Congenital Heart Disease, Vol.13, No.2, pp. 288-294, 2018, DOI:10.1111/chd.12569

    Abstract Background: The right ventricular (RV) contractile reserve is a measure of the dynamic function of the RV and is a sensitive indicator of volume load. This can be measured noninvasively using the tricuspid annular plane systolic excursion (TAPSE) during exercise. We studied the RV contractile reserve of patients after tetralogy of Fallot (TOF) repair with varying degree of RV dilation and pulmonary regurgitation (PR), and compared them to a control group.
    Methods: Twenty-six patients who had undergone TOF repair (mean age 29 ± 10 years) were identified and stratified into three group based on the presence and severity of RV… More >

  • Open Access

    ARTICLE

    Fetal heart size measurements as new predictors of homozygous α-thalassemia-1 in mid-pregnancy

    Xinyan Li1, Xiaoxia Qiu1, Huan Huang1, Yili Zhao2, Xueqin Li1, Meng Li1, Xiaoxian Tian1

    Congenital Heart Disease, Vol.13, No.2, pp. 282-287, 2018, DOI:10.1111/chd.12568

    Abstract Objective: To evaluate the efficacy of using fetal heart size measurements derived from axial echocardiography to predict homozygous α-thalassemia-1.
    Design: Prospective diagnostic study.
    Setting: The carrier rate of α-thalassemia-1 (–/αα) in China’s Guangxi Zhuang Autonomous Region is approximately 15%. If both parents are carriers, the risk of homozygous a-thalassemia-1 in one pregnancy is 25%.
    Patients: Singleton mid-pregnancies at risk of homozygous α-thalassemia-1 were enrolled.
    Outcome Measures: Fetal heart measurements, including heart diameter (HD), heart length (HL), heart circumference (HC), and heart area (HA), were measured. The z-scores for these heart parameters were then calculated separately based on previously constructed z-score… More >

  • Open Access

    ARTICLE

    Association between maternal body mass index and congenital heart defects in infants: A meta-analysis

    Yu Zhu1*, Yong Chen1*, Yu Feng2, Di Yu1, Xuming Mo1

    Congenital Heart Disease, Vol.13, No.2, pp. 271-281, 2018, DOI:10.1111/chd.12567

    Abstract We conducted this meta-analysis to address the open question of a possible association between maternal body mass index (BMI) and congenital heart defects (CHDs) in infants. We conducted a comprehensive computerized search of PubMed, Web of Science, Medline, and Embase databased (January 1980 through August 2017). We assessed the association between maternal BMI and the risk for congenital heart defects in their offspring. Study-specific relative risk estimates were polled according to random-effect or fixed-effect models. From 2567 citations, a total of 13 case-control studies and 4 cohort studies were selected for a meta-analysis, including more than 1 150 000 cases.… More >

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