Double Bladder Sign: Three Cases of an Ultrasonographic Sign that Indicates Ovarian Torsion.

Ovarian torsion is a surgical emergency that can be difficult to diagnose and can therefore lead to delayed treatment and loss of ovarian function. While the diagnosis of ovarian torsion is based clinically, several sonographic findings can suggest ovarian torsion, including an enlarged ovary, presence of an ovarian cyst or mass, or abnormal ovarian blood flow. Less commonly described is the finding of an abnormal ovarian location in a clinical setting concerning for torsion. We present three cases of ovarian torsion where an ultrasonographic finding of a "double bladder sign" aided in early detection of ovarian torsion.

An Evaluation of Risk Attitudes and Risk Tolerance in Emergency Medicine Residents.

Introduction Previous studies have shown that risk attitudes and tolerance for uncertainty are significant factors in clinical decision-making, particularly in the practice of defensive medicine. These attributes have also been linked with rates of physician burnout. To date, the risk profile of emergency medicine (EM) physicians has not yet been described. Our goal was to examine the risk profile of EM residents using a widely available risk tolerance and attitude assessment tool. Methods First-, second-, and third-year residents of Thomas Jefferson University Hospital's EM residency program completed the commercially available, unmodified Risk Type Compass, a validated instrument offered by Multi-Health Systems (MHS Inc, New York, USA). Scored reports included information on residents' risk type (one of eight personality types that reflect their temperament and disposition); risk attitudes (domains where residents are more likely to engage in risky behaviors); and an overall risk tolerance indicator (RTi) (a numerical estimate of risk tolerance). RTi scores are reported as means with 95% confidence intervals (CIs). Results There was no significant change in RTi scores in residents across different years of their post-graduate year (PGY) training. PGY-one residents trended towards risk aversion; PGY-two residents were more risk-taking; and PGY-three residents scored in the middle. Conclusion Our pilot assessment of risk types in EM residents highlighted shifts across the years of training. Variations between members of each PGY cohort outweighed any outright differences between classes with regards to absolute risk tolerance. There was an increase in the frequency of health and safety risk-taking attitude with higher PGY class, and this was also the risk attitude that was the prominent domain for resident risk tolerance. The study was limited by sample size and single cross-sectional evaluation.

Ultrasound-guided regional anesthesia simulation: use of meat glue in inexpensive and realistic nerve block models.

BACKGROUND: Ultrasound-guided regional anesthesia (UGRA) is increasingly used by emergency physicians to provide safe and effective pain relief for patients. However, one of the factors limiting its widespread use is the lack of realistic models available for learners to train on. There are currently no inexpensive nerve block models available that are injectable and that closely mimic nerves, fascial planes, muscles, and other landmarks. Our aim is to create inexpensive, injectable nerve block models that can be used as effective medical training tools for UGRA. METHODS: By using a lean cut of pork such as pork loin, yarn soaked in ultrasound gel to simulate peripheral nerves, and drinking straws filled with gel to represent vascular structures, we created various nerve block models. Meat glue applied between sections of meat appears hyperechoic under ultrasound, thereby mimicking fascial planes and has the added benefit of helping to secure the components of the model together. Using these elements, we were able to create realistic peripheral nerve, fascia iliaca compartment, serratus anterior plane, and interscalene brachial plexus models. RESULTS: One of the necessary skills in performing UGRA involves placing the needle tip along a fascial plane and visualizing hydrodissection of this plane with the local anesthetic. When meat glue (transglutaminase) is applied between layers of meat such as pork loin, the meat binds together and creates a hyperechoic line that mimics a fascial plane. When meat glue is applied to two apposing fascial layers naturally occurring on the meat, the fascial plane can be injected, and fluid can be seen hydrodissecting in this space. We created several nerve block models using meat glue and other components to mimic normal landmarks. CONCLUSIONS: We have developed inexpensive and easily reproducible models that create the realistic appearance of tissues, nerves, and fascial planes under ultrasound. They can also accurately simulate hydrodissection of fluid in fascial planes. We hope these nerve block models will allow for the education in UGRA to be more widespread and accessible to learners from all specialties.

Glycal Metallanitrenes for 2-Amino Sugar Synthesis: Amidoglycosylation of Gulal-, Allal-, Glucal-, and Galactal 3-Carbamates.

The rhodium(II)-catalyzed oxidative cyclization of glycal 3-carbamates with in situ incorporation of an alcohol nucleophile at the anomeric position provides access to a range of 2-amino sugars having 1,2-trans-2,3-cis stereochemistry, a structural motif present in compounds of medicinal and biological significance such as the streptothricin group of antibiotics and the Chitinase inhibitor allosamidin. All of the diastereomeric d-glycal 3-carbamates have been investigated, revealing significant differences in anomeric stereoselectivity depending on substrate stereochemistry and protecting groups. In addition, some substrates were prone to forming C3-oxidized dihydropyranone byproducts under the reaction conditions. Allal- and gulal 3-carbamates provided uniformly high stereo- and chemoselectivity, while for glucal substrates, acyclic, electron-withdrawing protecting groups at the 4 O and 6 O positions were required. Galactal 3-carbamates have been the most challenging substrates; formation of their amidoglycosylation products is most effective with an electron-withdrawing 6 O-Ts substituent and a sterically demanding 4 O-TBS group. These results suggest a mechanism whereby conformational and electronic factors determine the partitioning of an intermediate acyl nitrenoid between alkene addition, leading to amidoglycosylation, and C3-H insertion, providing the dihydropyranone byproduct. Along the amidoglycosylation pathway, high anomeric selectivity results when a glycosyl aziridine intermediate is favored over an aziridine-opened oxocarbenium donor.

Ice-man Down: Using Simulation to Practice the Safe Extrication of Collapsed Hockey Players in a Confined Space.

Sporting event emergencies are common among both spectators and players, with unique sets of challenges associated with patient extrication in unfamiliar and chaotic environments. It is critical for sports physicians and trainers to deliberately train and prepare for emergent situations with limited resources during athletic events. One of the most difficult, yet commonly encountered challenges is determining when and how to safely remove an injured player's helmet and sporting equipment, particularly if a spinal injury is highly suspected. We created a high-fidelity simulation case to practice the safe extrication of a hockey player who collapses on the bench in the player's box, a space-restricted environment. The patient is a 25-year-old male hockey player who becomes unresponsive after a syncopal episode in the player's box, and subsequently transferred to a medical center for further evaluation. Critical actions include extrication of the player at the scene, diagnosis of syncope, placement of the unconscious player on a backboard with cervical-spine precautions, removal of the player's faceguard, removing the player off the ice, checking the electrocardiogram and glucose level, and transferring the player to a controlled environment. The learning objectives were to identify, evaluate, and manage the reversible causes of syncope, and demonstrate appropriate techniques for the optimal removal of sports equipment. Learner assessment was based on participation in the scenario and debriefing learners after the simulation. Post-simulation debriefing revealed that participants highly appreciated practicing not-so-commonly encountered hockey-related emergencies. Athletic trainers and emergency providers were able to effectively practice their management of the unresponsive hockey player. The participants were also able to deliberately practice their teamwork and communications skills with their peers. Learning points include proper c-spine immobilization techniques in a tight space and indication for gear-removal in an unconscious patient. As hockey continues to gain popularity, this simulation case will prepare athletic trainers and emergency providers to better address the reversible causes for syncope in hockey players, as well as safely and effectively extricate injured players from space-limiting sporting environments.

Reversible Cerebral Vasoconstriction Disorder in a Patient with a Chief Complaint of Headache.

As emergency medicine physicians, we have formulated an approach to managing patients with a chief complaint of headache that starts with considering the story the patient relays in the context of a wide differential. Here we will describe a case that presented to our emergency department in hopes to broaden your differential. Reversible cerebral vasoconstriction syndrome (RCVS), well described in the neurology literature, is characterized by severe headaches that may or may not be accompanied by neurological symptoms and is definitively diagnosed by diffuse constriction of cerebral arteries on cerebral angiogram. Here we present a case of a patient who presented to the emergency department with intermittent severe persistant headaches and was diagnosed with reversible cerebral vasoconstriction syndrome.

Air and its Sonographic Appearance: Understanding the Artifacts.

BACKGROUND: Although air has traditionally been considered a barrier to sonographic imaging, when encountered in unusual settings it can serve as an important indicator of various pathologic states as well. Clinician recognition and thorough understanding of the characteristic pattern of artifacts generated by air are critical for making a number of important diagnoses. CASE SERIES: We present five emergency department cases in which air was visualized in a pathologic location. Pneumothorax, pneumoperitoneum, necrotizing fasciitis, or Fournier's gangrene, and subcutaneous emphysema and pneumomediastinum, can be rapidly and easily identified on ultrasound by the presence of air artifacts. The relevant sonographic findings are described and discussed in this article. WHY SHOULD AN EMERGENCY PHYSICIAN BE AWARE OF THIS?: Due to its inherent impedance mismatch with other human tissues, air has a characteristic appearance on ultrasound that includes irregular hyperechoic structures, "dirty shadowing," A-lines, and decreased visualization of deeper structures. Knowledge of the sonographic appearance of air artifacts can assist the physician in making a diagnosis, selecting appropriate additional imaging, and enlisting specialist consultation.