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7. Papillary Muscle Infarction by Cardiac MRI in Patients With Mitral Regurgitation.

Author

Hou, Jie, Sun, Yu, Wang, Huishan, Zhang, Libo, and Yang, Benqiang

Subjects
PAPILLARY muscles, CARDIAC magnetic resonance imaging, MITRAL valve insufficiency, CARDIAC patients, MYOCARDIUM
Abstract

Background: Papillary muscle (PM) infarction (PMI) detected by cardiac magnetic resonance imaging (CMR) is associated with poor outcomes. Whether PM parameters provide more value for mitral regurgitation (MR) management currently remains unclear. Therefore, we examined the prognostic value of PMI using CMR in patients with MR. Methods: Between March 2018 and July 2023, we retrospectively enrolled 397 patients with MR undergoing CMR. CMR was used to detect PMI qualitatively and quantitively. We also collected baseline clinical, echocardiography, and follow‐up data. Results: Of the 397 patients with MR (52.4 ± 13.9 years), 117 (29.5%) were assigned to the PMI group, with 280 (70.5%) in the non‐PMI group. PMI was demonstrated more in the posteromedial PM (PM‐PM, 98/117) than in the anterolateral PM (AL‐PM, 45/117). Compared with patients without PMI, patients with PMI had a decreased AL‐PM (41.5 ± 5.4 vs. 45.6 ± 5.3)/PM‐PM diastolic length (35.0 ± 5.2 vs. 37.9 ± 4.0), PM‐longitudinal strain (LS, 20.4 ± 6.1 vs. 24.9 ± 4.6), AL‐PM‐LS (19.7 ± 6.8 vs. 24.7 ± 5.6)/PM‐PM‐LS (21.2 ± 7.9 vs. 25.2 ± 6.0), and increased inter‐PM distance (25.7 ± 8.0 vs. 22.7 ± 6.2, all p < 0.001). Multiple logistic regression analyses identified male sex (odds ratio [OR] = 3.65, 95% confidence interval = 1.881−7.081, p < 0.001) diabetes mellitus (OR/95% CI/p = 2.534/1.13–5.68/0.024), AL‐PM diastolic length (OR/95% CI/p = 0.841/0.77–0.92/< 0.001), PM‐PM diastolic length (OR/95% CI/p = 0.873/0.79–0.964/0.007), inter‐PM distance (OR/95% CI/p = 1.087/1.028–1.15/0.003), AL‐PM‐LS (OR/95% CI/p = 0.892/0.843–0.94/< 0.001), and PM‐PM‐LS (OR/95% CI/p = 0.95/0.9–0.992/0.021) as independently associated with PMI. Over a 769 ± 367‐day follow‐up, 100 (25.2%) patients had arrhythmia. Cox regression analyses indicated that PMI (hazard ratio [HR]/95% CI/p = 1.644/1.062–2.547/0.026), AL‐PM‐LS (HR/95% CI/p = 0.937/0.903–0.973/0.001), and PM‐PM‐LS (HR/95% CI/p = 0.933/0.902–0.965/< 0.001) remained independently associated with MR. Conclusions: The CMR‐derived PMI and LS parameters improve the evaluation of PM dysfunction, indicating a high risk for arrhythmia, and provide additive risk stratification for patients with MR. [ABSTRACT FROM AUTHOR]

Published
2024
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28. Improved Energy Absorption Characteristics Based on Elastic Polymer-Modified Porous Material for Multiple Extreme Mechanical Impacts.

Author

Zhang, Jinming, Dai, Keren, Wang, Xiaofeng, Yu, Da, Yang, Benqiang, Zhang, He, and You, Zheng

Subjects
POROUS materials, IMPACT (Mechanics), ABSORPTION, COMPOSITE materials, ELECTRONIC equipment
Abstract

Energy absorbing materials are crucial for the protection of electronic devices in various applications. In particular, the protection of materials from multiple extreme mechanical impacts imposes stringent requirements on the characteristics of energy absorption and recoverability. In this paper, a novel design of composite material, elastic polymer-modified porous carbon, is proposed to meet such urgent requirements. At the micro level, the polymer fibers form an elastic skeleton in which porous carbon particles are enveloped. Due to such microstructure, the composite material exhibits excellent performance of energy absorption and recoverability simultaneously, which are validated via various experiments. Furthermore, the microphysical mechanism of its superior energy absorption characteristics is demonstrated theoretically. Additionally, the optimized mass proportions of the two composite phases are discussed. In general, this novel design of energy absorbing material improves the reliability of electronic devices and systems exposed to multiple extreme mechanical impacts. [ABSTRACT FROM AUTHOR]

Published
2020
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29. GW28-e1149 Three-dimensional reconstruction analysis of the esophagus, left atrium, and pulmonary veins: Implications for cryoablation of atrial fibrillation

Author

Zhang Yuji, Yang Benqiang, Guitang Yang, Wang Shuang, Sun Mingyu, Ding Jian, Liang Ming, Wang Zulu, Han Yaling, and Xiao Junrui

Subjects
medicine.medical_specialty, business.industry, medicine.medical_treatment, Left atrium, Cryoablation, Atrial fibrillation, macromolecular substances, medicine.disease, medicine.anatomical_structure, Internal medicine, cardiovascular system, medicine, Cardiology, cardiovascular diseases, Esophageal injury, Esophageal Fistula, Esophagus, Cardiology and Cardiovascular Medicine, business, Severe complication
Abstract

To assess the posterior left atrial–esophageal relationship throughout the cryoablation of atrial fibrillation, avoiding esophageal injury and even more severe complication of post procedure atrial esophageal fistula. From July 2016 to September 2016, 36 consecutive atrial fibrillation patients

Published
2017

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