Clinical Application of a Modern High‐Definition Head‐Mounted Display in Sonography

Because of the remarkably improved image quality and wearability of modern head‐mounted displays, a monitoring system using a head‐mounted display rather than a fixed‐site monitor for sonographic scanning has the potential to improve the diagnostic performance and lessen the examiner's physical burden during a sonographic examination. In a preclinical setting, 2 head‐mounted displays, the HMZ‐T2 (Sony Corporation, Tokyo, Japan) and the Wrap1200 (Vuzix Corporation, Rochester, NY), were found to be applicable to sonography. In a clinical setting, the feasibility of the HMZ‐T2 was shown by its good image quality and acceptable wearability. This modern device is appropriate for clinical use in sonography.     

Atypical Spontaneous Intracranial Hypotension With a Head‐Shaking Headache

Spontaneous intracranial hypotension (SIH) is typically characterized by orthostatic headache; however, various atypical manifestations of SIH have been reported recently. We report here the case of a 46‐year‐old man with headache secondary to SIH, which was nonorthostatic, triggered only when the patient shook his head. We suggest that SIH should be suspected in patients with headache induced by head‐shaking, even without orthostatic features, especially when the headache is accompanied by other symptoms commonly associated with SIH.     

A Cost‐effective,Gelatin‐Based Phantom Model for Learning Ultrasound‐Guided Fine‐Needle Aspiration Procedures of the Head and Neck

The rise in popularity of ultrasound imaging has seen a corresponding increase in demand for effective training tools such as phantom models. They are especially useful for teaching and practice of invasive procedures, such as fine‐needle aspiration of lesions of the head and neck. We have created 2 gelatin models out of inexpensive, commonly available materials that can be used in sequence to learn head and neck fine‐needle aspiration. Fundamental skills can be learned first on the flat, rectangular model, whereas the second, cylindrical model more closely represents human anatomy and can be used to develop more advanced technique.     

Patient‐derived monoclonal antibodies directed towards beta2 glycoprotein‐1 display lupus anticoagulant activity

Summary. Background: Patients with antiphospholipid syndrome (APS) display a heterogeneous population of antibodies with beta₂ glycoprotein‐1 (β₂GP1) as the major antigen. Objectives: We isolated and characterized human mAbs directed against β₂GP1 from the immune repertoire of APS patients. Methods: Variable heavy chain repertoires from B cells from two APS patients with anti‐β₂GP1 antibodies were cloned into the pHEN1‐VLrep vector. Constructed full‐length IgG antibodies were tested for lupus anticoagulant (LAC) activity and binding to β₂GP1 and its domains. Results: Two clones of each patient were selected on the basis of the reactivity of single chain Fv (scFv) fragments displayed on phages towards full‐length β₂GP1 and its isolated domain I. The affinity of selected antibodies for β₂GP1 was lost when transforming from phages to monovalent scFvs, and was regained when antibodies were constructed as complete IgG, indicating a role for bivalency in binding to β₂GP1. Both selected clones from patient 2 recognized domain I of β₂GP1, and for both clones selected from patient 1, binding required the presence of both domain I and domain II. All mAbs displayed LAC activity in both activated partial thromboplastin time‐based and dilute Russell’s viper venom test‐based clotting assays and in thrombin generation. Conclusions: In this study, we show successful cloning of patient‐derived mAbs that require domain I of β₂GP1 for binding, and that display LAC activity that is dependent on their affinity for β₂GP1. These antibodies can help us to gain more insights into the pathogenesis of APS, and may facilitate standardization of APS diagnosis.     

Review article: Non‐fatal strangulation: Hidden injuries,hidden risks

Non‐fatal strangulation (NFS) can be a cause of severe injury. However, the prevalence and rates of injuries from NFS are unknown, as few victims present to medical attention after strangulation. As up to 40% of fatal strangulations have no external signs, and the majority of surviving victims have few or minor injuries, finding those people severely injured remains challenging. The majority of the evidence regarding NFS is largely based on case reports and case series with no robust studies estimating rates of injuries or the best investigation tools. The injuries that are reported make clear that strangulation is a potentially lethal form of injury that should not be ignored in those presenting having been strangled, or in those presenting with neurological symptoms, including strokes, seizures and vascular abnormalities. The safety implications of strangulation are also important as it can be a prelude to homicide. A search of the literature was carried out with the following terms: Nonfatal strangulation (10), Nonfatal strangulation (17), ‘Strangulation injuries’ (19), ‘Manual strangulation’ (92) – laboratory testing eliminated, and ‘choking game’. The PubMed database was used first, followed by the collections of Monash University and the Strangulation Institute (as some articles were too old to find electronically). This article summarises the injuries that can occur following strangulation and discusses the quality of the evidence thus far.     

18F‐FDG PET/CT and MRI in the follow‐up of head and neck squamous cell carcinoma

We evaluated the diagnostic performance of ¹⁸F‐FDG PET/CT and MRI for the assessment of head and neck squamous cell carcinoma (HNSCC) relapse. Since early treatment might prevent inoperable relapse, we also evaluated THE performance of early unenhanced ¹⁸F‐FDG PET/CT in residual tumor detection. The study was prospectively performed on 32 patients who underwent ¹⁸F‐FDG PET/CT and MRI before treatment and at 4 and 12 months after treatment. ¹⁸F‐FDG PET/CT was also performed 2 weeks after the end of radiotherapy. Histopathology or a minimum of 18 months follow‐up were used as gold standard. Before treatment ¹⁸F‐FDG PET/CT and MRI detected all primary tumors except for two limited vocal fold lesions (sensitivity 94%). MRI was more sensitive than ¹⁸F‐FDG PET/CT for the detection of local extension sites (sensitivity 75 vs 58%), but at the cost of a higher rate of false positive results (positive predictive value 74 vs 86%). For relapse detection at 4 months, sensitivity was significantly higher for ¹⁸F‐FDG PET/CT (92%) than for MRI (70%), but the diagnostic performances were not significantly different at 12 months. For the detection of residual malignant tissue 2 weeks post‐radiotherapy, sensitivity and specificity of ¹⁸F‐FDG PET/CT were respectively 86 and 85% (SUV cut‐off value 5.8). ¹⁸F‐FDG PET/CT is effective in the differentiation between residual tumor and radiation‐induced changes, as early as 2 weeks after treatment of a primary HNSCC. For follow‐up, performance of ¹⁸F‐FDG PET/CT and MRI are similar except for a higher sensitivity of ¹⁸F‐FDG PET/CT at 4 months. Copyright © 2011 John Wiley & Sons, Ltd.     

Endothelium‐dependent and endothelium‐independent effects of 1‐nitro‐2‐propylbenzene on rat aorta

A group of nitro compounds contains a benzene ring in a short aliphatic chain with the NO₂ group, property that supposedly favors its vasodilator profile. In this study, we evaluated in isolated rat aorta the effects of 1‐nitro‐2‐propylbenzene (NPB), a nitro compound containing the NO₂ in the aromatic ring. In aorta precontracted with KCl, NPB (1‐3000 μm ) induced full endothelium‐independent relaxation. In endothelium‐intact preparations, phenylephrine‐induced contractions were fully relaxed by NPB, effect unaltered by N(ω)‐nitro‐L‐arginine methyl ester (L‐NAME) or 1H‐[1,2,4]oxadiazolo[4,3‐a]quinoxalin‐1‐one (ODQ). In the concentration range of 30–300 μm , NPB slightly but significantly potentiated the phenylephrine‐induced contraction. Such potentiation was unaltered by the thromboxane‐prostanoid receptor antagonist seratrodast, but was abolished by endothelium removal or by preincubation of endothelium‐intact preparations with L‐NAME, ODQ or by ruthenium red and HC‐030031, blockers of subtype 1 of ankyrin transient receptor potential (TRPA₁) channels. Verapamil exacerbated the potentiating effect of NPB. The potentiating effect was undetectable in preparations precontracted by 9,11‐dideoxy‐11α,9α‐epoxymethanoprostaglandin F2α (U‐46619). Relaxation was reduced by ruthenium red while it was enhanced by HC‐030031. In conclusion, NPB has vasodilator properties but with a mechanism of action distinct from its analogues. Contrary to other nitro compounds, its relaxing effects did not involve recruitment of the guanylyl cyclase pathway. NPB has also endothelium‐dependent potentiating properties on phenylephrine‐induced contractions, a phenomenon that putatively required a role of endothelial TRPA₁ channels. The present findings reinforce the notion that the functional group NO₂ in the aliphatic chain of these nitro compounds determines favorably their vasodilator properties.