[Angioedema in the emergency department].

Acute angioedema is mostly found in the head and neck region. Therefore, it can be life threatening by potentially endangering air way patency. Pathophysiologically angioedemas can be divided into mast cell-mediated or bradykinin-mediated forms.

Piezosurgery-A Safe Technique to Perform Lateral Suboccipital Craniotomy?

Background: Piezosurgery (PS) is a relatively new technique based on microvibrations generated by the piezoelectric effect. It selectively cuts bone tissue and preserves the surrounding soft tissue.

Objective: To evaluate the use of PS for performing lateral suboccipital craniotomy.

Piezosurgery-, neuroendoscopy-, and neuronavigation-assisted intracranial approach for removal of a recurrent petrous apex cholesteatoma: technical note.

Current approaches for resection of petrous bone cholesteatomas (PBCs), such as canal wall up (closed) and canal wall down (open) mastoidectomies, in the pediatric population present recurrence rates ranging between 17% and 70% with a high rate of postoperative complications involving hearing loss and facial nerve weakness. This technical note illustrates an alternative intracranial approach that was used in combination with the techniques of piezoelectric surgery, neuroendoscopy, and neuronavigation for safe and effective removal in a difficult pediatric case of recurrent PBC. The third recurrence of a PBC in a 14-year-old girl was diagnosed by CT and MRI.

Piezosurgery in Modified Pterional Orbital Decompression Surgery in Graves Disease.

Objective: Piezosurgery uses microvibrations to selectively cut bone, preserving the adjacent soft tissue. The present study evaluated the use of piezosurgery for bone removal in orbital decompression surgery in Graves disease via a modified pterional approach.

Methods: A piezosurgical device (Piezosurgery medical) was used in 14 patients (20 orbits) with Graves disease who underwent orbital decompression surgery in additional to drills and rongeurs for bone removal of the lateral orbital wall and orbital roof.

Navigation accuracy after automatic- and hybrid-surface registration in sinus and skull base surgery.

Objective: Computer-aided-surgery in ENT surgery is mainly used for sinus surgery but navigation accuracy still reaches its limits for skull base procedures. Knowledge of navigation accuracy in distinct anatomical regions is therefore mandatory. This study examined whether navigation accuracy can be improved in specific anatomical localizations by using hybrid registration technique.

Prospects and limitations of different registration modalities in electromagnetic ENT navigation.

The present study examined electromagnetic tracking technology for ENT navigation. Five different registration modalities were compared and navigation accuracy was assessed. Four skull models were individually fabricated with a three-dimensional printer, based on patients' computer tomography datasets.

Comparison of 3D C-arm-based registration to conventional pair-point registration regarding navigation accuracy in ENT surgery.

Objective: Navigation surgery on the skull base requires high navigation accuracy. The registration process is related to the main loss in accuracy. This study compared titanium screw registration with an inbuilt registration process of a 3-dimensional (3D) C-arm.

Is there an equivalence of non-invasive to invasive referenciation in computer-aided surgery?

Various navigation systems with non-invasive patient referenciation and registration methods have been developed in times of minimal-invasive and computer-aided surgery. However, hard data proving the equivalence of different referenciation systems are missing. The present study investigated invasive and non-invasive referenciation systems with regard to overall navigation accuracy as well as navigation accuracy at specific anatomic locations.

Device setting modifications for 3D flatpanel imaging in skull base surgery.

To evaluate the image quality and clinical implementation after setting modification of a three-dimensional isocentric C-arm fluoroscopic image intensifier system combined with a digital flatpanel detector as a new tool for sinus and petrous bone surgery. Image acquisition was performed using two cadaveric heads. Experimental design was oriented to the clinically sensible intraoperative setup.

Combined effects of chronic and acute ethanol on pancreatic injury and microcirculation.

Objectives: Aim of the study was to investigate pancreatic microcirculatory and histopathological changes in rats after chronic ethanol liquid diet feeding.

Methods: To investigate the influence of chronic alcohol exposition (CAE) on the pancreas, rats were fed with either Lieber-DeCarli (LDC) control diet or LDC alcohol diet for 2, 4, or 6 weeks and received additionally an acute ethanol administration (AEA) for 90 minutes. Intravital microscopy was performed at baseline, 45 minutes, and 90 minutes after starting AEA.

A Rare Case of Radiologically Not Distinguishable Coexistent Meningioma and Vestibular Schwannoma in the Cerebellopontine Angle - Case Report and Literature Review.

BACKGROUND: The simultaneous occurrence of cerebellopontine angle (CPA) meningioma and vestibular schwannoma (VS) in the absence of neurofibromatosis type 2 or history of irradiation is very rare. We report a case with coexistent CPA meningioma and VS, which were radiologically not distinguishable in preoperative imaging. CASE DESCRIPTION: A 46-year-old female presented with acute hearing loss, tinnitus and gait ataxia.

Influence of different registration modalities on navigation accuracy in ear, nose, and throat surgery depending on the surgical field.

Objectives/hypothesis: Various invasive and noninvasive registration methods have been established in the past for intraoperative navigation. The present study compared the registration and navigation accuracy of three different registration modalities in anatomical locations of special interest for ear, nose, and throat surgery.

Study Design: Prospective experimental phantom study.