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Mechanical valve obstruction

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https://www.readbyqxmd.com/read/28221172/interventional-pulmonology-in-chronic-obstructive-pulmonary-disease
#1
Daniela Gompelmann, Nilab Sarmand, Felix J F Herth
PURPOSE OF REVIEW: Chronic obstructive pulmonary disease (COPD) and emphysema are widespread diseases associated with progressive dyspnea because of airflow limitation and hyperinflation. Fundamental therapeutic strategies consist of pulmonary rehabilitation, pharmacotherapy, long-term oxygen therapy, noninvasive ventilation, and surgical therapeutic approaches. RECENT FINDINGS: In the last 14 years, endoscopic therapeutic modalities emerged as a substantial part of severe COPD and emphysema treatment...
February 17, 2017: Current Opinion in Pulmonary Medicine
https://www.readbyqxmd.com/read/28209176/infective-endocarditis-causing-mitral-valve-stenosis-a-rare-but-deadly-complication-a-case-report
#2
Michael A Hart, Gautam R Shroff
BACKGROUND: Infective endocarditis rarely causes mitral valve stenosis. When present, it has the potential to cause severe hemodynamic decompensation and death. There are only 15 reported cases in the literature of mitral prosthetic valve bacterial endocarditis causing stenosis by obstruction. This case is even more unusual due to the mechanism by which functional mitral stenosis occurred. CASE PRESENTATION: We report a case of a 23-year-old white woman with a history of intravenous drug abuse who presented with acute heart failure...
February 17, 2017: Journal of Medical Case Reports
https://www.readbyqxmd.com/read/28144067/stenting-of-critical-tracheal-stenosis-with-adjuvant-cardio-pulmonary-bypass
#3
Himanshu Bhardwaj, Ahmed Awab, Houssein A Youness, Brent Brown
Severe and critical central airway obstruction causing impaired ventilation and/or oxygenation can impose tremendous challenges on the interventional pulmonologist. Near total airway obstruction can rapidly evolve into potentially fatal complete airway occlusion during bronchoscopic airway manipulation under moderate sedation; as well as during the induction of the general anesthesia. Although there are currently interventional pulmonary procedures available to tackle the critical airway obstruction in extreme situations, cardio-pulmonary bypass should be considered prior to the intervention to maintain the adequate gas exchange during the procedure...
January 2017: Lung India: Official Organ of Indian Chest Society
https://www.readbyqxmd.com/read/28012497/giant-bulla-formation-in-the-lung-because-of-a-check-valve-mechanism
#4
Aya Hirata, Takeshi Saraya, Nobuaki Arai, Shin Karita, Riken Kawachi, Hidefumi Takei, Kosuke Ohkuma, Manabu Ishida, Masachika Fujiwara, Hajime Takizawa
The pathogenesis of bulla formation has not yet been demonstrated in pathologic examinations or through direct visualization during thoracotomy or thoracoscopic surgery. We present two cases of giant bulla formation after pneumothorax because of cryptogenic organizing pneumonia and lung abscess. The case findings suggested that the pathogenesis was attributable to a check-valve mechanism, secondary to bronchiolitis obliterans, or the presence of an obstructing air leakage due to a lung fistula. The lung fistula had been covered by inflammatory membranes consisting of blood and/or fibrous precipitates with detached visceral pleura...
January 2017: Respiratory Investigation
https://www.readbyqxmd.com/read/27993741/spinal-intradural-arachnoid-webs-causing-spinal-cord-compression-with-inconclusive-preoperative-imaging-a-report-of-three-cases-and-a-review-of-the-literature
#5
Dafang Zhang
OBJECTIVE: Spinal arachnoid webs are a rare variant of spinal arachnoid cysts where one or multiple focal membranes of arachnoid tissue obstruct the subarachnoid space. Only 11 prior cases of arachnoid webs have been reported in the literature. Our objective is to present a series of three consecutive cases of arachnoid webs from our institution and to review the literature on this rare condition to provide recommendations for its management. METHODS: A retrospective chart review was performed for three consecutive cases of intradural arachnoid webs causing spinal cord compression at our institution, with inconclusive preoperative imaging, treatment with surgical decompression and resection...
December 16, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/27992862/endobronchial-valves-for-endoscopic-lung-volume-reduction-best-practice-recommendations-from-expert-panel-on-endoscopic-lung-volume-reduction
#6
Dirk-Jan Slebos, Pallav L Shah, Felix J F Herth, Arschang Valipour
Endoscopic lung volume reduction (ELVR) is being adopted as a treatment option for carefully selected patients suffering from severe emphysema. ELVR with the one-way endobronchial Zephyr valves (EBV) has been demonstrated to improve pulmonary function, exercise capacity, and quality of life in patients with both heterogeneous and homogenous emphysema without collateral ventilation. In this "expert best practices" review, we will highlight the practical aspects of this therapy. Key selection criteria for ELVR are hyperinflation with a residual volume >175% of predicted, forced expiratory volume <50% of predicted, and a 6-min walking distance >100 m...
2017: Respiration; International Review of Thoracic Diseases
https://www.readbyqxmd.com/read/27956913/myxoma-immediately-above-the-junction-of-the-inferior-vena-cava-and-the-right-atrium-a-rare-cause-of-budd-chiari-syndrome
#7
Vahid Mohammad Karimi, Amir Anushiravani, Mohammad Hossein Dabbaghmanesh, Massood Hosseinzadeh, Ali Reza Rasekhi, Mahmoud Zamirian, Amir Anushiravani
The Budd-Chiari syndrome (BCS) is a rare disorder caused by the obstruction of the hepatic veins or the inferior vena cava (IVC) at the suprahepatic level. This syndrome is developed by either hepatic vein thrombosis or mechanical venous obstruction and leads to centrilobular hepatic congestion with the subsequent development of fibrosis and cirrhosis. Intracardiac tumors have been rarely reported as a cause of the BCS. These tumors usually originate from the atrial septum. Very rarely, they arise either from the junction of the IVC and the right atrium or from the Eustachian valve...
July 6, 2016: Journal of Tehran Heart Center
https://www.readbyqxmd.com/read/27928260/emergency-redo-mitral-valve-replacement-immediately-after-caesarean-section
#8
İbrahim Duvan, Ümit Pınar Sungur, Burak Emre Onuk, Mehmet Şanser Ateş, İbrahim Sami Karacan, Murat Kurtoğlu
Surgery for heart diseases during pregnancy, especially necessitating cardiopulmonary bypass, is believed to trigger maternal and fetal risks and should be performed only when medical therapy has been unsuccessful to alleviate the cardiac decompensation. A 33-year-old pregnant woman in her 33rd week of gestation was admitted to our hospital. She had rheumatic mitral valvular stenosis and had undergone mitral valve replacement (MVR) with a mechanical prosthesis 11 years earlier in another center. Echocardiography revealed a thrombotic mass obstructing the leaflets of the mechanical mitral valve...
April 13, 2016: Journal of Tehran Heart Center
https://www.readbyqxmd.com/read/27847070/mitraclip-implantation-for-the-treatment-of-new-onset-systolic-anterior-motion-of-the-mitral-valve-after-transcatheter-aortic-valve-replacement
#9
Carmelo Grasso, Salvatore Scandura, Sergio Buccheri, Marco Barbanti, Maria Elena Di Salvo, Sarah Mangiafico, Giuseppe Ronsivalle, Sebastiano Immé, Claudia Tamburino, Martina Patané, Carmelo Sgroi, Davide Capodanno, Piera Capranzano, Corrado Tamburino
New-onset systolic anterior motion of the anterior mitral valve leaflet in patients undergoing transcatheter aortic valve replacement is a rare pathophysiologic mechanism leading to postprocedural development of mitral regurgitation and, eventually, left ventricular outflow obstruction. We report the first human case of successful MitraClip implantation to treat new-onset systolic anterior motion of the mitral valve after transcatheter aortic valve replacement causing severe obstruction to left ventricular outflow that was unresponsive to standard medical therapy...
December 2016: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/27815920/intestinal-hemorrhage-caused-by-meckel-s-diverticulum-with-ectopic-gastric-mucosa-on-polypoid-lesion-a-case-report
#10
Toshiyuki Irie, Seiichi Shinji, Hiroki Arai, Hayato Kan, Takeshi Yamada, Michihiro Koizumi, Yasuyuki Yokoyama, Goro Takahashi, Takuma Iwai, Mikihiro Okusa, Keiichiro Ohta, Eiji Uchida
Meckel's diverticulum may sometimes present as an intraluminal polypoid mass causing small bowel obstruction; however, gastrointestinal bleeding due to Meckel's diverticulum with a polypoid lesion is rare. A 14-year-old girl presented with tarry stool and syncope in our hospital. Laboratory examination showed iron-deficiency anemia with a low hemoglobin level of 5.8 g/dl. The bleeding site was detected by neither upper gastrointestinal endoscopy nor colonoscopy. Transanal double-balloon enteroscopy showed a diverticulum with an ulceration at a site approximately 50 cm from the ileocecal valve and a polypoid lesion inside of the diverticulum...
December 2016: Surgical Case Reports
https://www.readbyqxmd.com/read/27804157/echocardiographic-assessment-of-prosthetic-mitral-valves-in-children
#11
Taiyu Hayashi, Ryo Inuzuka, Hiroshi Ono, Hitoshi Kato
AIMS: We studied how Doppler-derived hemodynamic parameters in children change as the relative prosthetic mitral valve (PMV) size decreases with somatic growth and evaluated the diagnostic utility of the parameters for detecting PMV obstruction in children. METHODS AND RESULTS: We reviewed 26 echocardiographic examination results of 15 mechanical bileaflet PMVs in 12 children. The median age at echocardiographic examination was 6.6 (0.6-18.1) years. The PMV functioned normally in 24 examinations but was obstructed due to thrombosis in two cases...
January 2017: Echocardiography
https://www.readbyqxmd.com/read/27768247/associations-between-maternal-water-consumption-and-birth-defects-in-the-national-birth-defects-prevention-study-2000-2005
#12
Breanna L Alman, Evan Coffman, Anna Maria Siega-Riz, Thomas J Luben
BACKGROUND: Water and water-based beverages constitute a major part of daily fluid intake for pregnant women, yet few epidemiologic studies have investigated the role of water consumption on birth outcomes. METHODS: We used data from the National Birth Defects Prevention Study to conduct a case-control study investigating associations between maternal water consumption during pregnancy and birth defects (BD). We used interview data on water consumption during the first trimester of pregnancy in 14,454 cases (major BDs n ≥ 50) and 5,063 controls...
October 21, 2016: Birth Defects Research. Part A, Clinical and Molecular Teratology
https://www.readbyqxmd.com/read/27760527/outcome-of-cardiac-surgery-in-patients-with-low-preoperative-ejection-fraction
#13
Marina Pieri, Alessandro Belletti, Fabrizio Monaco, Antonio Pisano, Mario Musu, Veronica Dalessandro, Giacomo Monti, Gabriele Finco, Alberto Zangrillo, Giovanni Landoni
BACKGROUND: In patients undergoing cardiac surgery, a reduced preoperative left ventricular ejection fraction (LVEF) is common and is associated with a worse outcome. Available outcome data for these patients address specific surgical procedures, mainly coronary artery bypass graft (CABG). Aim of our study was to investigate perioperative outcome of surgery on patients with low pre-operative LVEF undergoing a broad range of cardiac surgical procedures. METHODS: Data from patients with pre-operative LVEF ≤40 % undergoing cardiac surgery at a university hospital were reviewed and analyzed...
October 18, 2016: BMC Anesthesiology
https://www.readbyqxmd.com/read/27722697/thermally-actuated-wax-valves-for-paper-fluidic-diagnostics
#14
Elizabeth A Phillips, Rui Shen, Siyu Zhao, Jacqueline C Linnes
The complexity of current paper-fluidic diagnostic devices is limited by their imperfect control of reagent incubation and delivery. Valves providing complete fluid obstruction and multiple actuation steps within a single paper-fluidic diagnostic would increase the range of diagnostic bioassays in these porous membranes. Here, we report the rapid fabrication of tunable wax-ink valves that are thermally actuated within porous membranes. Varying width bands of wax-ink were printed onto strips of nitrocellulose and cellulose membranes and characterized by their triggered obstruction and release of fluid wicking through the membranes...
October 18, 2016: Lab on a Chip
https://www.readbyqxmd.com/read/27659877/physiological-mechanisms-of-pulmonary-hypertension
#15
REVIEW
David H MacIver, Ismail Adeniran, Iain R MacIver, Alistair Revell, Henggui Zhang
Pulmonary hypertension is usually related to obstruction of pulmonary blood flow at the level of the pulmonary arteries (eg, pulmonary embolus), pulmonary arterioles (idiopathic pulmonary hypertension), pulmonary veins (pulmonary venoocclusive disease) or mitral valve (mitral stenosis and regurgitation). Pulmonary hypertension is also observed in heart failure due to left ventricle myocardial diseases regardless of the ejection fraction. Pulmonary hypertension is often regarded as a passive response to the obstruction to pulmonary flow...
October 2016: American Heart Journal
https://www.readbyqxmd.com/read/27576330/subacute-left-ventricular-outflow-tract-obstruction-after-transapical-closure-of-a-mitral-paravalvular-leak-in-the-region-of-the-aortomitral-curtain
#16
Sathish Chikkabyrappa, Doff B McElhinney, Muhamed Saric
We report a rare case of progressive left ventricular outflow tract (LVOT) obstruction after percutaneous device closure of a mechanical prosthetic mitral valve (MV) paravalvular leak (PVL) in the region of aortomitral curtain in a patient who also had small mechanical aortic valve prosthesis with patient-prosthesis mismatch.
November 2016: Echocardiography
https://www.readbyqxmd.com/read/27568118/the-functional-significance-of-paradoxical%C3%A2-low-gradient-aortic%C3%A2-valve%C3%A2-stenosis-hemodynamic-findings-during-cardiopulmonary%C3%A2-exercise%C3%A2-testing
#17
Candelas Pérez Del Villar, Raquel Yotti, María Ángeles Espinosa, Enrique Gutiérrez-Ibañes, Alicia Barrio, María José Lorenzo, Pedro Luis Sánchez Fernández, Yolanda Benito, Raquel Prieto, Esther Pérez David, Pablo Martínez-Legazpi, Francisco Fernández-Avilés, Javier Bermejo
OBJECTIVES: The goal of this study was to determine the functional impact of paradoxical low-gradient aortic stenosis (PLGAS) and clarify whether the relevance of the valvular obstruction is related to baseline flow. BACKGROUND: Establishing the significance of PLGAS is particularly challenging. METHODS: Twenty symptomatic patients (77 ± 6 years of age; 17 female subjects) with PLGAS (mean gradient 28 ± 6 mm Hg; aortic valve area 0.8 ± 0...
January 2017: JACC. Cardiovascular Imaging
https://www.readbyqxmd.com/read/27543649/endoscopic-atrioventricular-valve-surgery-in-adults-with-difficult-to-access-uncorrected-congenital-chest-wall-deformities
#18
Johan van der Merwe, Filip Casselman, Bernard Stockman, Yvette Vermeulen, Ivan Degrieck, Frank Van Praet
OBJECTIVES: This study presents the first report on in-hospital and long-term outcomes of endoscopic port access atrioventricular valve surgery (EPAAVVS) in adult patients with uncorrected congenital chest wall deformities (CCWDs). METHODS: Our current surgical team performed EPAAVVS in 7 consecutive adult patients (mean age 51.3 ± 16.4 years, 14.3% female, 50% older than 60 years, mean EuroSCORE II 0.8 ± 0.1%) with uncorrected CCWDs between 1 November 2009 and 30 November 2015...
December 2016: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/27499619/the-differential-effects-of-inspiratory-expiratory-and-combined-resistive-breathing-on-healthy-lung
#19
Konstantinos Loverdos, Dimitrios Toumpanakis, Eleni Litsiou, Vassiliki Karavana, Constantinos Glynos, Christina Magkou, Stamatios Theocharis, Theodoros Vassilakopoulos
Combined resistive breathing (CRB) is the hallmark of obstructive airway disease pathophysiology. We have previously shown that severe inspiratory resistive breathing (IRB) induces acute lung injury in healthy rats. The role of expiratory resistance is unknown. The possibility of a load-dependent type of resistive breathing-induced lung injury also remains elusive. Our aim was to investigate the differential effects of IRB, expiratory resistive breathing (ERB), and CRB on healthy rat lung and establish the lowest loads required to induce injury...
2016: International Journal of Chronic Obstructive Pulmonary Disease
https://www.readbyqxmd.com/read/27497941/bowel-obstruction-and-perforation-due-to-a-large-gallstone-a-case-report
#20
Georgios Sahsamanis, Konstantinos Maltezos, Panagiotis Dimas, Alexandros Tassos, Christos Mouchasiris
INTRODUCTION: Gallstone bowel obstruction is a rare form of mechanical ileus usually presenting in elderly patients, and is associated with chronic or acute cholecystitis episodes. CASE PRESENTATION: We present the case of an 80year old female with abdominal pain, inability to defecate and recurrent episodes of diarrhea for the past 8 months. CT examination uncovered a cholecystoduodenal fistula along with gas in the gall bladder and the presence of a ≥2cm gallstone inside the small bowel lumen causing obstruction...
2016: International Journal of Surgery Case Reports
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