Automatic segmentation method of pelvic floor levator hiatus in ultrasound using a self-normalizing neural network.

Segmentation of the levator hiatus in ultrasound allows the extraction of biometrics, which are of importance for pelvic floor disorder assessment. We present a fully automatic method using a convolutional neural network (CNN) to outline the levator hiatus in a two-dimensional image extracted from a three-dimensional ultrasound volume. In particular, our method uses a recently developed scaled exponential linear unit (SELU) as a nonlinear self-normalizing activation function, which for the first time has been applied in medical imaging with CNN.

Arterial tortuosity syndrome: 40 new families and literature review.

Purpose: We delineate the clinical spectrum and describe the histology in arterial tortuosity syndrome (ATS), a rare connective tissue disorder characterized by tortuosity of the large and medium-sized arteries, caused by mutations in SLC2A10.

Methods: We retrospectively characterized 40 novel ATS families (50 patients) and reviewed the 52 previously reported patients. We performed histology and electron microscopy (EM) on skin and vascular biopsies and evaluated TGF-β signaling with immunohistochemistry for pSMAD2 and CTGF.

Correlations between Sonographic and Urodynamic Findings after Mid Urethral Sling Surgery.

Purpose: We studied correlations between sonographic and urodynamic findings after suburethral sling surgery.

Materials And Methods: This retrospective study was done in 141 women who underwent multichannel urodynamic testing and translabial 4-dimensional ultrasound after suburethral sling surgery between 2006 and 2016. We determined the sling-pubis gap, ie the distance between the sling and the inferior posterior margin of the pubic symphysis, during the Valsalva maneuver and the urethral motion profile.

Functional pelvic floor anatomy in Nepali women attending a general gynaecology clinic.

Introduction And Hypothesis: Limited existing evidence suggests that there is a high prevalence of female pelvic organ prolapse (POP) amongst Nepali women. However, to date, no comprehensive assessment of pelvic floor functional anatomy has been undertaken in this population. Our study aimed to determine functional pelvic floor anatomy in Nepali women attending a general gynaecology clinic.

Psychological consequences of pelvic floor trauma following vaginal birth: a qualitative study from two Australian tertiary maternity units.

Vaginal birth may result in damage to the levator ani muscle (LAM) with subsequent pelvic floor dysfunction and there may be accompanying psychological problems. This study examines associations between these somatic injuries and psychological symptoms. A qualitative study using semi-structured interviews to examine the experiences of primiparous women (n = 40) with known LAM trauma was undertaken.

The impact of childbirth on pelvic floor morphology in primiparous Black South African women: a prospective longitudinal observational study.

Introduction And Hypothesis: There is a lack of prospective studies evaluating the impact of childbirth on the pelvic floor in non-white populations. We intended to study delivery-related changes in pelvic floor morphology in Black South African primiparae. We also intended to determine the impact of anatomical changes on symptoms in the postpartum period.

Gigadalton-scale shape-programmable DNA assemblies.

Natural biomolecular assemblies such as molecular motors, enzymes, viruses and subcellular structures often form by self-limiting hierarchical oligomerization of multiple subunits. Large structures can also assemble efficiently from a few components by combining hierarchical assembly and symmetry, a strategy exemplified by viral capsids. De novo protein design and RNA and DNA nanotechnology aim to mimic these capabilities, but the bottom-up construction of artificial structures with the dimensions and complexity of viruses and other subcellular components remains challenging.

Biotechnological mass production of DNA origami.

DNA nanotechnology, in particular DNA origami, enables the bottom-up self-assembly of micrometre-scale, three-dimensional structures with nanometre-precise features. These structures are customizable in that they can be site-specifically functionalized or constructed to exhibit machine-like or logic-gating behaviour. Their use has been limited to applications that require only small amounts of material (of the order of micrograms), owing to the limitations of current production methods.

Single-Molecule Observation of the Photoregulated Conformational Dynamics of DNA Origami Nanoscissors.

We demonstrate direct observation of the dynamic opening and closing behavior of photocontrollable DNA origami nanoscissors using high-speed atomic force microscopy (HS-AFM). First the conformational change between the open and closed state controlled by adjustment of surrounding salt concentration could be directly observed during AFM scanning. Then light-responsive moieties were incorporated into the nanoscissors to control these structural changes by photoirradiation.

Corrigendum: Candidate Gene Resequencing in a Large Bicuspid Aortic Valve-Associated Thoracic Aortic Aneurysm Cohort: as an Important Contributor.

[This corrects the article on p. 400 in vol. 8, PMID: 28659821.

Risk factors for prolapse recurrence: systematic review and meta-analysis.

Introduction And Hypothesis: Female pelvic organ prolapse (POP) is a common condition, with a lifetime risk for surgery of 10-20%. Prolapse procedures are known to have a high reoperation rate. It is assumed that etiological factors for POP may also be risk factors for POP recurrence after surgery.

UROLITHIASIS IN FREE-RANGING AND CAPTIVE OTTERS (LUTRA LUTRA AND AONYX CINEREA) IN EUROPE.

Between 1996 and 1998, 477 dead otters from different Central European countries were examined for urolithiasis, including 449 free-ranging Eurasian otters (Lutra lutra) as well as 17 Eurasian otters and 11 Asian small-clawed otters (Aonyx cinerea) from captivity. In the free-ranging specimens, uroliths (sand or stones) were found in 105 animals (23.4%), with no significant difference (P = 0.

Digitation to Void: What Is the Significance of This Symptom?

Objective: Digitation to void is defined as the need to apply manual pressure on the perineum or the vagina to assist with voiding. It has been associated with prolapse; however, there is little objective data concerning this symptom. Our aim was to determine the correlation between digitation to void, symptoms and signs of pelvic organ prolapse (POP), and urodynamic data.

Obesity: how much does it matter for female pelvic organ prolapse?

Introduction And Hypothesis: The objective was to determine the association between body mass index (BMI) and symptoms and signs of female pelvic organ prolapse (POP).

Methods: An observational cross-sectional study of 964 archived datasets of women seen for symptoms and signs of lower urinary tract and pelvic organ dysfunction between September 2011 and February 2014 at a tertiary urogynaecology centre in Australia was carried out. An in-house standardised interview, the International Continence Society Pelvic Organ Prolapse Quantification (ICS POP-Q) and 4-D translabial ultrasound, followed by analysis of ultrasound volumes for pelvic organ descent and hiatal area on Valsalva, were performed, blinded against other data.

Nonmyocyte ERK1/2 signaling contributes to load-induced cardiomyopathy in Marfan mice.

Among children with the most severe presentation of Marfan syndrome (MFS), an inherited disorder of connective tissue caused by a deficiency of extracellular fibrillin-1, heart failure is the leading cause of death. Here, we show that, while MFS mice (Fbn1C1039G/+ mice) typically have normal cardiac function, pressure overload (PO) induces an acute and severe dilated cardiomyopathy in association with fibrosis and myocyte enlargement. Failing MFS hearts show high expression of TGF-β ligands, with increased TGF-β signaling in both nonmyocytes and myocytes; pathologic ERK activation is restricted to the nonmyocyte compartment.

Vaginal laxity: what does this symptom mean?

Introduction And Hypothesis: Vaginal laxity is a poorly understood symptom of pelvic floor dysfunction. The purpose of this study was to investigate associations between the symptom of vaginal laxity and its bother on the one hand, and demographic data, other symptoms, and findings on examination on the other hand.

Methods: This was a retrospective observational study at a tertiary urogynecological unit.

Is a "dragging sensation" a symptom of female pelvic organ prolapse?

Introduction And Hypothesis: Pelvic organ prolapse (POP) commonly presents with a "vaginal lump or bulge" and/or a "dragging sensation." The first symptom correlates strongly with clinical and imaging data. However, a "dragging sensation" may be less specific.

How We Make DNA Origami.

DNA origami has attracted substantial attention since its invention ten years ago, due to the seemingly infinite possibilities that it affords for creating customized nanoscale objects. Although the basic concept of DNA origami is easy to understand, using custom DNA origami in practical applications requires detailed know-how for designing and producing the particles with sufficient quality and for preparing them at appropriate concentrations with the necessary degree of purity in custom environments. Such know-how is not readily available for newcomers to the field, thus slowing down the rate at which new applications outside the field of DNA nanotechnology may emerge.

Candidate Gene Resequencing in a Large Bicuspid Aortic Valve-Associated Thoracic Aortic Aneurysm Cohort: as an Important Contributor.

Bicuspid aortic valve (BAV) is the most common congenital heart defect. Although many BAV patients remain asymptomatic, at least 20% develop thoracic aortic aneurysm (TAA). Historically, BAV-related TAA was considered as a hemodynamic consequence of the valve defect.

Interethnic variation in pelvic floor morphology in women with symptomatic pelvic organ prolapse.

Introduction And Hypothesis: There is a lack of epidemiological studies evaluating female pelvic organ prolapse in developing countries. Current studies have largely focused on women of white ethnicity. This study was designed to determine interethnic variation in pelvic floor functional anatomy, namely, levator hiatal distensibility and pelvic organ descent, in women with symptomatic pelvic organ prolapse in a multi-ethnic South African population.