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https://www.readbyqxmd.com/read/29150458/diagnostic-accuracy-of-neonatal-assessment-for-gestational-age-determination-a-systematic-review
#1
REVIEW
Anne Cc Lee, Pratik Panchal, Lian Folger, Hilary Whelan, Rachel Whelan, Bernard Rosner, Hannah Blencowe, Joy E Lawn
CONTEXT: An estimated 15 million neonates are born preterm annually. However, in low- and middle-income countries, the dating of pregnancy is frequently unreliable or unknown. OBJECTIVE: To conduct a systematic literature review and meta-analysis to determine the diagnostic accuracy of neonatal assessments to estimate gestational age (GA). DATA SOURCES: PubMed, Embase, Cochrane, Web of Science, POPLINE, and World Health Organization library databases...
November 17, 2017: Pediatrics
https://www.readbyqxmd.com/read/29145349/current-status-of-endoscopic-gallbladder-drainage
#2
Joey Ho Yi Chan, Anthony Yuen Bun Teoh
The gold standard for treatment of acute cholecystitis is laparoscopic cholecystectomy. However, cholecystectomy is often not suitable for surgically unfit patients who are too frail due to various co-morbidities. As such, several less invasive endoscopic treatment modalities have been developed to control sepsis, either as a definitive treatment or as a temporizing modality until the patient is stable enough to undergo cholecystectomy at a later stage. Recent developments in endoscopic ultrasound-guided gallbladder drainage (EUS-GBD) with endoscopic ultrasound (EUS)-specific stents having lumen-apposing properties have demonstrated potential as a definitive treatment modality...
November 17, 2017: Clinical Endoscopy
https://www.readbyqxmd.com/read/29144490/neonatal-lung-ultrasound-exam-guidelines
#3
D Kurepa, N Zaghloul, L Watkins, J Liu
Point-of-care ultrasound (POC-US) is increasingly used especially in emergency and critical-care medicine. It is focused, quick and does not expose patients to ionizing radiation. It encompasses all organ systems and has well-defined indications. Lung ultrasound (LUS) represents one of the most exciting applications in the field of POC-US. It is particularly important to emphasize the role of LUS in neonatology due to the specific pathology inherent in lung immaturity as well as in the particular sensitivity of neonates to repeated radiation exposure...
November 16, 2017: Journal of Perinatology: Official Journal of the California Perinatal Association
https://www.readbyqxmd.com/read/29144251/evaluation-of-dorsal-midline-discolorations-with-physical-examination-and-ultrasound
#4
Liat Ben-Sira, Penina Ponger, Shlomi Constantini
OBJECTIVE: To assess the association between dorsal midline skin discolorations, tethering of the spinal cord, and the role of ultrasound screening of these stigmata, focusing specifically on vascular lesions. STUDY DESIGN: We conducted a prospective observational study of infants <6 months of age with suspicious dorsal midline skin stigmata. All were evaluated by physical examination and ultrasound scan. A subset also had a magnetic resonance imaging examination...
November 2017: Journal of Pediatrics
https://www.readbyqxmd.com/read/29142842/prevention-and-management-of-bleeding-in-thyroid-surgery
#5
REVIEW
Gabriele Materazzi, Carlo Enrico Ambrosini, Lorenzo Fregoli, Luigi De Napoli, Gianluca Frustaci, Valeria Matteucci, Piermarco Papini, Sohail Bakkar, Paolo Miccoli
Post-thyroidectomy neck hematoma represents a major concern for surgeons because it can result in severe and even life-threatening complications. In fact, postoperative hemorrhage may result in airway compression and respiratory distress, and therefore, effective hemostasis is an important goal in thyroid surgery. Postoperative hematoma occurs at a rate of approximately 0.1% to 1.1%. Almost all cases occur in the first 6 h after surgery and can be the result of several surgeon or patient factors. For many years the clamp-and-tie technique has been the most common way to divide the main vascular pedicles of the thyroid gland...
October 2017: Gland Surgery
https://www.readbyqxmd.com/read/29141266/-impact-of-abdominal-ultrasound-on-the-identification-of-the-site-of-infection-in-the-emergency-department-analysis-whether-it-makes-sense-to-perform-abdominal-ultrasound-examination-for-the-identfication-of-the-site-of-infection-if-medical-history-and-clinical
#6
Barbara Werkmeister, Julia Langgartner, Doris Schacherer, Arno Mohr
Introduction A very high number of patients presenting in emergency departments suffer from an unknown infection or rather fever. If diagnostic imaging is necessary ultrasound can be performed. Whether ultrasound is superior to medical history and clinical examination considering the significantly enhanced technology in recent years and hence has to be performed in patients without abdominal symptoms with non-obvious focus cannot be answered by review of the literature. The objective of this study was to evaluate the relevance of abdominal ultrasound in the determination of the site of infection and to analyse whether an abdominal ultrasound for the identification of the source of infection is dispensable in patients in whom history and clinical examination do not indicate an abdominal focus...
November 2017: Zeitschrift Für Gastroenterologie
https://www.readbyqxmd.com/read/29140326/photoacoustic-endomicroscopy-based-on-a-mems-scanning-mirror
#7
Heng Guo, Chaolong Song, Huikai Xie, Lei Xi
In this Letter, we present a high-resolution photoacoustic endomicroscopy probe based on a microelectromechanical systems (MEMS) scanning mirror. The built-in optical assembly consists of a 0.7 mm graded-index (GRIN) lens for light focusing and a ϕ1  mm MEMS mirror to reflect and scan the beam. A miniaturized unfocused ultrasound transducer with a center frequency of 10 MHz is used for photoacoustic detection. Sharp blades, carbon fibers, and black tapes were utilized to evaluate the performance of the system...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29139101/-endobronchial-ultrasound-ebus-an-update-2017
#8
K Darwiche, F Özkan, C Wolters, S Eisenmann
Endobronchial Ultrasound (EBUS) with the two modalities curved and radial EBUS significantly improved the diagnostics in several pulmonary diseases. The examination and staging of mediastinal and hilar lymph nodes in patients with known or suspected lung malignancy as well as the evaluation of unknown pulmonary or mediastinal lesions can be achieved with minimal invasive means when using EBUS. More invasive surgical procedures for diagnostic purposes can be omitted. The diagnostic yield also increases when EBUS is applied in sarcoidosis or mediastinal lymph node tuberculosis but only to some extend in case of lymphoma...
November 2017: Pneumologie
https://www.readbyqxmd.com/read/29137800/passive-acoustic-mapping-of-cavitation-using-eigenspace-based-robust-capon-beamformer-in-ultrasound-therapy
#9
Shukuan Lu, Hong Hu, Xianbo Yu, Jiangying Long, Bowen Jing, Yujin Zong, Mingxi Wan
Pulse-echo imaging technique can only play a role when high intensity focused ultrasound (HIFU) is turned off due to the interference between the primary HIFU signal and the transmission pulse. Passive acoustic mapping (PAM) has been proposed as a tool for true real-time monitoring of HIFU therapy. However, the most-used PAM algorithm based on time exposure acoustic (TEA) limits the quality of cavitation image. Recently, robust Capon beamformer (RCB) has been used in PAM to provide improved resolution and reduced artifacts over TEA-based PAM, but the presented results have not been satisfactory...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137770/numerical-investigation-of-the-inertial-cavitation-threshold-under-multi-frequency-ultrasound
#10
Dingjie Suo, Bala Govind, Shengqi Zhang, Yun Jing
Through the introduction of multi-frequency sonication in High Intensity Focused Ultrasound (HIFU), enhancement of efficiency has been noted in several applications including thrombolysis, tissue ablation, sonochemistry, and sonoluminescence. One key experimental observation is that multi-frequency ultrasound can help lower the inertial cavitation threshold, thereby improving the power efficiency. However, this has not been well corroborated by the theory. In this paper, a numerical investigation on the inertial cavitation threshold of microbubbles (MBs) under multi-frequency ultrasound irradiation is conducted...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137753/synthesis-of-nanocomposites-of-iron-oxide-gold-fe3o4-au-loaded-on-activated-carbon-and-their-application-in-water-treatment-by-using-sonochemistry-optimization-study
#11
Saideh Bagheri, Hossein Aghaei, Mehrorang Ghaedi, Arash Asfaram, Majid Monajemi, Ali Akbar Bazrafshan
This paper focuses on the finding best operational conditions using response surface methodology (RSM) for Rhodamine123 (R123) and Disulfine blue (DSB) dyes removal by ultrasound assisted adsorption onto Au-Fe3O4 nanoparticles loaded on activated carbon (Au-Fe3O4 NPs-AC). The influences of variables such as initial R123 (X1) and DSB concentration (X2), pH (X3), adsorbent mass (X4) and sonication time (X5) on their removal were investigated by small central composite design (CCD) under response surface methodology...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137752/microwave-and-ultrasound-assisted-synthesis-of-poly-vinyl-chloride-riboflavin-modified-mwcnts-examination-of-thermal-mechanical-and-morphology-properties
#12
Amir Abdolmaleki, Shadpour Mallakpour, Faezeh Azimi
This study focused on the preparation and investigation of physicochemical features of new poly(vinyl chloride) (PVC) nanocomposites (NCs) including different amounts of carboxylated multi-walled carbon nanotubes (MWCNTs-COOH) functionalized with riboflavin (RIB). Firstly, to increase the hydrophilicity of MWCNTs, the surface of them was functionalized by incorporating and formation of ester groups with RIB as a low cost and environmentally friendly biomolecule through ultrasound and microwave irradiations...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29135012/shrinking-microbubbles-with-microfluidics-mathematical-modelling-to-control-microbubble-sizes
#13
A Salari, V Gnyawali, I M Griffiths, R Karshafian, M C Kolios, S S H Tsai
Microbubbles have applications in industry and life-sciences. In medicine, small encapsulated bubbles (<10 μm) are desirable because of their utility in drug/oxygen delivery, sonoporation, and ultrasound diagnostics. While there are various techniques for generating microbubbles, microfluidic methods are distinguished due to their precise control and ease-of-fabrication. Nevertheless, sub-10 μm diameter bubble generation using microfluidics remains challenging, and typically requires expensive equipment and cumbersome setups...
November 14, 2017: Soft Matter
https://www.readbyqxmd.com/read/29133392/closed-loop-control-of-targeted-ultrasound-drug-delivery-across-the-blood-brain-tumor-barriers-in-a-rat-glioma-model
#14
Tao Sun, Yongzhi Zhang, Chanikarn Power, Phillip M Alexander, Jonathan T Sutton, Muna Aryal, Natalia Vykhodtseva, Eric L Miller, Nathan J McDannold
Cavitation-facilitated microbubble-mediated focused ultrasound therapy is a promising method of drug delivery across the blood-brain barrier (BBB) for treating many neurological disorders. Unlike ultrasound thermal therapies, during which magnetic resonance thermometry can serve as a reliable treatment control modality, real-time control of modulated BBB disruption with undetectable vascular damage remains a challenge. Here a closed-loop cavitation controlling paradigm that sustains stable cavitation while suppressing inertial cavitation behavior was designed and validated using a dual-transducer system operating at the clinically relevant ultrasound frequency of 274...
November 13, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29132574/major-abdominal-trauma-critical-decisions-and-new-frontiers-in-management
#15
REVIEW
Megan Brenner, Christopher Hicks
A standardized approach should be used with a patient with abdominal trauma, including primary and secondary surveys, followed by additional diagnostic testing as indicated. Specific factors can make the diagnosis of serious abdominal trauma challenging, particularly in the face of multiple and severe injuries, unknown mechanism of injury, altered mental status, and impending or complete cardiac arrest. Advances in technology in diagnosis and/or treatment with ultrasound, helical computed tomography, and resuscitative endovascular balloon occlusion of the aorta (REBOA) have significantly advanced trauma care, and are still the focus of current and ongoing investigations...
February 2018: Emergency Medicine Clinics of North America
https://www.readbyqxmd.com/read/29131073/an-introduction-to-contrast-enhanced-ultrasound-for-nephrologists
#16
Emily H Chang
Contrast-enhanced ultrasound (CEUS) is an emerging technology with no known nephrotoxicity. CEUS has been utilized in cardiac and abdominal imaging for decades in Asia and Europe and has recently received greater attention in the United States with its approval for characterization of indeterminate liver lesions. Emerging data suggest that CEUS has potential as a diagnostic imaging tool among individuals who have contraindications to CT and MRI. Few nephrologists are aware of CEUS and even fewer are aware of its potential applications among individuals with kidney disease...
November 9, 2017: Nephron
https://www.readbyqxmd.com/read/29129265/does-intra-tumoural-fat-on-mri-predict-visibility-of-small-%C3%A2-3-cm-hepatocellular-carcinomas-during-ultrasound-guided-tumour-ablation
#17
T C H Hui, I K H Huang, W K Lau, U Pua
AIM: To assess if intra-tumoural fat on magnetic resonance imaging (MRI) affects the ultrasonographic (US) visibility of small (≤3 cm) hepatocellular carcinomas (HCC) during radiofrequency ablation (RFA). MATERIALS AND METHODS: Institutional review board approval was obtained. A retrospective review of all patients who underwent image-guided ablation between 1 January 2010 and 31 April 2015 was performed. Patients with HCC who underwent US RFA were included. Inclusion criteria included small tumours (≤3 cm), treatment-naive cases or new focus of HCC in a different and untreated segment, and pre-procedural MRI...
November 10, 2017: Clinical Radiology
https://www.readbyqxmd.com/read/29128955/right-brodmann-area-18-predicts-tremor-arrest-after-vim-radiosurgery-a-voxel-based-morphometry-study
#18
Constantin Tuleasca, Tatiana Witjas, Dimitri Van de Ville, Elena Najdenovska, Antoine Verger, Nadine Girard, Jerome Champoudry, Jean-Philippe Thiran, Meritxell Bach Cuadra, Marc Levivier, Eric Guedj, Jean Régis
INTRODUCTION: Drug-resistant essential tremor (ET) can benefit from open standard stereotactic procedures, such as deep-brain stimulation or radiofrequency thalamotomy. Non-surgical candidates can be offered either high-focused ultrasound (HIFU) or radiosurgery (RS). All procedures aim to target the same thalamic site, the ventro-intermediate nucleus (e.g., Vim). The mechanisms by which tremor stops after Vim RS or HIFU remain unknown. We used voxel-based morphometry (VBM) on pretherapeutic neuroimaging data and assessed which anatomical site would best correlate with tremor arrest 1 year after Vim RS...
November 11, 2017: Acta Neurochirurgica
https://www.readbyqxmd.com/read/29128035/bedside-identification-of-massive-pulmonary-embolism-with-point-of-care-transesophageal-echocardiography
#19
Tomislav Jelic, Melanie Baimel, Jordan Chenkin
BACKGROUND: Pulmonary embolism can be difficult to diagnose, particularly in those who are hemodynamically unstable and cannot be imaged to confirm the diagnosis. Echocardiography can allow for rapid assessment of patients in shock, but requires adequate transthoracic windows to obtain clinically useful information. Emergency physician-performed transesophageal echocardiography (TEE) may be a useful tool when transthoracic echocardiography fails. CASE REPORT: An 86-year-old woman presented to the emergency department after a fall at home...
November 2017: Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29127760/preoperative-breast-mri-examination-for-all-patients-with-histologically-proven-breast-cancer-a-concept-for-a-prospective-multicenter-trial
#20
Christina Kaiser, Christina Kehrer, Mignon-Denise Keyver-Paik, Thomas Hecking, Tiyasha Hosne Ayub, Claudia Leutner, Hans Schild, Walther Kuhn
Background A published retrospective data of our study group demonstrated that premenopausal women, patients with lobular invasive breast cancer or patients with high breast density [American College of Radiology (ACR) classification 3+4] significantly benefit from magnetic resonance imaging (MRI) leading to additional detection of malignant foci of 20.2% in the index and 2.5% in the contralateral breast, which would otherwise not be detected by routine imaging. Critics of preoperative MRI focus on higher false-positive rates leading to unnecessary surgical procedures and mastectomies...
November 11, 2017: Hormone Molecular Biology and Clinical Investigation
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