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Article ; Online: Estimating Rupture Front of Large Earthquakes Using a Novel Multi-Array Back-Projection Method

Hailin Du

Frontiers in Earth Science, Vol

2021 Volume 9

Abstract: A ruptured front obtained from high-frequency energy radiation is the key to understand the complex source. It is commonly observed that rupture fronts derived from different arrays often show some variations due to the obvious difference of the ... ...

Abstract	A ruptured front obtained from high-frequency energy radiation is the key to understand the complex source. It is commonly observed that rupture fronts derived from different arrays often show some variations due to the obvious difference of the positioning accuracy of the far-field array between the azimuth and the epicentral distance. We developed a new multi-array back-projection method based on the classical back-projection method and applied the method to the 2015 MW7.8 Nepal earthquake. The back azimuth information with small error is separated from the classical back-projection results, and the azimuth intersection of multiple arrays is used to obtain more accurate spatial and temporal distribution information of the source rupture fronts.
Keywords	seismic array ; high-frequency energy radiation ; rupture process ; 2015 Nepal-Gorkha earthquake ; back-projection ; Science ; Q
Language	English
Publishing date	2021-06-01T00:00:00Z
Publisher	Frontiers Media S.A.
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Percutaneous coronary intervention for chronic total occlusion of the left circumflex branch in mirror dextrocardia: a case report.

Hailin, Du / Hongtu, Qiao / Wenyong, Zhang

Journal of medical case reports

2023 Volume 17, Issue 1, Page(s) 486

Abstract: Background: Mirror dextrocardia (MDC) is a condition in which the heart is located in a mirror-image position on the right side of the chest compared to the normal position in individuals with physiological variations. Patients with MDC and chronic ... ...

Abstract	Background: Mirror dextrocardia (MDC) is a condition in which the heart is located in a mirror-image position on the right side of the chest compared to the normal position in individuals with physiological variations. Patients with MDC and chronic total occlusion (CTO) of the left circumflex branch (LCX) are extremely rare in clinical practice. The treatment of MDC-CTO-LCX differs significantly from patients without mirror dextrocardia and the same condition in terms of instrument selection and procedural techniques. In this article, we report a successful case of interventional treatment in a patient with MDC-CTO-LCX. We summarize the anatomical and electrocardiographic variations in patients with MDC-CTO-LCX, and discuss the selection of interventional instruments and techniques that can be useful for interventionists as well as the diagnostic and therapeutic considerations that can be helpful for clinical physicians. Case presentation: A male Han Chinese patient, 51, was admitted, presenting recurrent chest pain for a year and recent onset of exertional fatigue over the past week.He reported episodes of chest pain following physical activities over the past year, lasting between 5 and 20 min.Despite these symptoms, the patient did not seek immediate medical attention, and the occurrence of his chest pain has progressively lessened within the year.A week prior, the patient developed exertional dyspnea after brief walks, though without any episodes of nocturnal paroxysmal dyspnea.Upon arrival at our hospital for evaluation, he was initially diagnosed with chronic coronary syndrome, previous inferior myocardial infarction, atrial arrhythmia, and classified under the New York Heart Association functional class III.Following his admission, a chest X-ray and coronary angiography were conducted.The results indicated mirror dextrocardia and total occlusion of the left circumflex branch. Percutaneous coronary intervention (PCI) was performed on the left circumflex branch. Subsequent angiography demonstrated optimal stent positioning without evidence of hematoma or dissection.Following the procedure, the patient's symptoms of chest pain and exertional dyspnea were resolved, which led to his subsequent discharge.A follow-up electrocardiogram, 10 months post-procedure, displayed a slow and regular atrial rhythm. Conclusions: The incidence of dextrocardia is very low, and it may appear normal on an electrocardiogram; however, careful diagnosis is required when there is an abnormal direction of the P wave in limb leads. During the operation for chronic occlusive lesions of the right-sided coronary artery, the anomalous anatomical structure necessitates specific requirements for instrument selection and operative techniques. After revascularization of chronic occlusive vessels in dextrocardia, routine electrocardiographic examination may show false normalization, requiring caution in interpretation.
MeSH term(s)	Humans ; Male ; Atrial Fibrillation ; Chest Pain/etiology ; Chronic Disease ; Coronary Angiography ; Coronary Occlusion/diagnostic imaging ; Coronary Occlusion/surgery ; Dextrocardia/complications ; Dextrocardia/diagnostic imaging ; Dextrocardia/surgery ; Dyspnea ; Percutaneous Coronary Intervention/methods ; Treatment Outcome ; Middle Aged
Language	English
Publishing date	2023-11-22
Publishing country	England
Document type	Case Reports ; Journal Article
ZDB-ID	2269805-X
ISSN	1752-1947 ; 1752-1947
ISSN (online)	1752-1947
ISSN	1752-1947
DOI	10.1186/s13256-023-04196-2
Database	MEDical Literature Analysis and Retrieval System OnLINE

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