Impedance Analysis and Noise Measurements on Multi Walled Carbon Nanotube Networks.

The electrical impedance characteristics of multi-walled carbon nanotube (MWCNTs) networks were studied as a function of CNT concentrations in the frequency range of 1 kHz-1 MHz. The novelty of this study is that the MWCNTs were not embedded in any polymer matrix and so the response of the device to electrical measurements are attributed to the CNTs in the network without any contribution from a polymer host matrix. Devices with low MWCNT packing density (0.31-0.85 µg/cm2) exhibit a frequency independent plateau in the low-frequency regime. At higher frequencies, the AC conductivity of these devices increases following a power law, characteristic of the universal dynamic response (UDR) phenomenon. On the other hand, devices with high MWCNT concentrations (>1.0 µg/cm2) exhibit frequency independent conductivity over the entire frequency range (up to 1 MHz), indicating that conduction in these devices is due to direct contact between the CNTs in the network. A simple single-relaxation time electrical equivalent circuit with an effective resistance and capacitance is used to describe the device performance. The electrical noise measurements on devices with different MWCNT packing densities exhibit bias-dependent low-frequency 1/f noise, attributed to resistance fluctuations.

Aiding Universal Health Coverage through Humanitarian Outreach Services and Global Health Diplomacy in Resource-Poor Settings.

According to the Lancet Commission Report on Global Surgery, it was estimated that in 2010 about 16.9 million lives were lost due to the unavailability of Surgical services. It was further calculated that 77.2 million DALYs could simply have been averted by providing basic surgical inspection and triage. Aiding Universal Health Coverage (UHC) through Humanitarian Outreach Services in Resource-Poor Settings is both challenging and difficult to execute. However, to promote and ensure the right to health even by vulnerable groups, the role of global health diplomacy (GHD) and humanitarian diplomacy is pivotal. GHD advances the health of the poor, contribute peacekeeping and promote health security as it is also concerned with the design, and delivery of global health interventions and programs in accordance with diplomatic criteria. The synergistic Humanitarian diplomacy is more focused in persuading decision-makers and opinion leaders to act, at all times, in the interest of vulnerable people and with full respect for our fundamental principles. Since the inclusion of surgical care in the universal basic health care services play a critical role in addressing the rising epidemic of injuries, non-communicable diseases and improving quality of life, there is a great need to address the inequities in pediatric surgical services in resource-poor settings. Hence the successful practice of GHD and humanitarian diplomacy is indispensable for establishing global partnerships, securing funding and strengthening systems to promote cost-effective and essential surgical care to achieve UHC and economic development.

Using a Novel Approach to Estimate Packing Density and Related Electrical Resistance in Multiwall Carbon Nanotube Networks.

In this work, we use contrast image processing to estimate the concentration of multi-wall carbon nanotubes (MWCNT) in a given network. The fractal dimension factor (D) of the CNT network that provides an estimate of its geometrical complexity, is determined and correlated to network resistance. Six fabricated devices with different CNT concentrations exhibit D factors ranging from 1.82 to 1.98. The lower D-factor was associated with the highly complex network with a large number of CNTs in it. The less complex network, having the lower density of CNTs had the highest D factor of approximately 2, which is the characteristic value for a two-dimensional network. The electrical resistance of the thin MWCNT network was found to scale with the areal mass density of MWCNTs by a power law, with a percolation exponent of 1.42 and a percolation threshold of 0.12 µg/cm2. The sheet resistance of the films with a high concentration of MWCNTs was about six orders of magnitude lower than that of less dense networks; an effect attributed to an increase in the number of CNT-CNT contacts, enabling more efficient electron transfer. The dependence of the resistance on the areal density of CNTs in the network and on CNT network complexity was analyzed to validate a two-dimension percolation behavior.

Herding cats and other epic challenges: Creating meaningful stakeholder engagement in community mental health research.

Stakeholder-centered approaches, that restrict patient barriers to clinical community mental health research, affect outcomes. It is suggested that a restructuring of clinical research organizational behavior and attitudes may overcome this problem. It is further advocated that consultation with an engagement of study patient stakeholders encourages their interest in the study, and is essential for successful research. This editorial considers the concept of stakeholder participation and management in the clinical research environment. It further offers practical suggestions for fostering meaningful stakeholder engagement.

Examination to assess the clinical examination and documentation of spine pathology among orthopedic residents.

BACKGROUND CONTEXT: The Accreditation Council for Graduate Medical Education (ACGME) guidelines requires residency programs to teach and evaluate residents in six overarching "core competencies" and document progress through educational milestones. To assess the progress of orthopedic interns' skills in performing a history, physical examination, and documentation of the encounter for a standardized patient with spinal stenosis, an objective structured clinical examination (OSCE) was conducted for 13 orthopedic intern residents, following a 1-month boot camp that included communications skills and curriculum in history and physical examination. Interns were objectively scored based on their performance of the physical examination, communication skills, completeness and accuracy of their electronic medical record (EMR), and their diagnostic conclusions gleaned from the patient encounter. PURPOSE: The purpose of this study was to meaningfully assess the clinical skills of orthopedic post-graduate year (PGY)-1 interns. The findings can be used to develop a standardized curriculum for documenting patient encounters and highlight common areas of weakness among orthopedic interns with regard to the spine history and physical examination and conducting complete and accurate clinical documentation. STUDY SETTING: A major orthopedic specialty hospital and academic medical center. METHODS: Thirteen PGY-1 orthopedic residents participated in the OSCE with the same standardized patient presenting with symptoms and radiographs consistent with spinal stenosis. Videos of the encounters were independently viewed and objectively evaluated by one investigator in the study. This evaluation focused on the completeness of the history and the performance and completion of the physical examination. The standardized patient evaluated the communication skills of each intern with a separate objective evaluation. Interns completed these same scoring guides to evaluate their own performance in history, physical examination, and communications skills. The interns' documentation in the EMR was then scored for completeness, internal consistency, and inaccuracies. RESULTS: The independent review revealed objective deficits in both the orthopedic interns' history and the physical examination, as well as highlighted trends of inaccurate and incomplete documentation in the corresponding medical record. Communication skills with the patient did not meet expectations. Further, interns tended to overscore themselves, especially with regard to their performance on the physical examination (p<.0005). Inconsistencies, omissions, and inaccuracies were common in the corresponding medical notes when compared with the events of the patient encounter. Nine of the 13 interns (69.2%) documented at least one finding that was not assessed or tested in the clinical encounter, and four of the 13 interns (30.8%) included inaccuracies in the medical record, which contradicted the information collected at the time of the encounter. CONCLUSIONS: The results of this study highlighted significant shortcomings in the completeness of the interns' spine history and physical examination, and the accuracy and completeness oftheir EMR note. The study provides a valuable exercise for evaluating residents in a multifaceted, multi-milestone manner that more accurately documents residents' clinical strengths and weaknesses. The study demonstrates that orthopedic residents require further instruction on the complexities of the spinal examination. It validates a need for increased systemic support for improving resident documentation through comprehensive education and evaluation modules.

Applied clinical anatomy: the successful integration of anatomy into specialty-specific senior electives.

PURPOSE: A strong foundation in anatomical knowledge is essential for physicians in all fields. Despite this established importance, anatomy continues to be primarily taught only during the pre-clinical years of medical school. Senior medical students have more mature clinical reasoning and analytical skills; therefore, advanced anatomy courses have great potential to integrate basic and clinical sciences to better prepare senior medical students for residency. METHODS: At our institution, five electives have been implemented that integrate anatomical education in clinical contexts in the fields of emergency medicine, musculoskeletal medicine, radiology, surgery, and obstetrics and gynecology. These 4-week courses are all offered in the spring of the final year of medical school. The course curricula, content, and evaluation data are described for each of the courses. RESULTS: The five electives have been extremely popular at our institution, and all have been consistently filled each year by students entering diverse disciplines. Course evaluations have been positive and students specifically note how these courses allow them the opportunity to integrate basic anatomical knowledge into clinical contexts. Students have marked improvement in anatomical knowledge after completion of these electives. CONCLUSIONS: Advanced anatomy courses that integrate anatomical education with clinical reasoning are important curricular innovations that are popular with students and lead to important improvements in anatomical knowledge. Anatomists can lead the charge for better integration of basic sciences into senior medical school curricula.

Assessing musculoskeletal examination skills and diagnostic reasoning of 4th year medical students using a novel objective structured clinical exam.

BACKGROUND: Medical students have difficulty performing and interpreting musculoskeletal physical examinations and interpreting the findings. Research has focused on students' knowledge deficits, but there are few direct assessments of students' ability to perform a hypothesis-driven physical examination (HDPE). We developed a novel musculoskeletal Objective Structured Clinical Exam (OSCE) focusing on HDPE skills for disorders of the shoulder, back and knee, and used it to explore medical student diagnostic reasoning. METHODS: A multidisciplinary group of musculoskeletal specialists developed and gathered validity evidence for a three station OSCE focusing on the HDPE of the shoulder, back and knee, emphasizing the ability to anticipate (identify pre-encounter) expected physical exam findings, and subsequently perform discriminatory physical examination maneuvers. The OSCE was administered to 45 final year medical students. Trained faculty observed and scored students' ability to anticipate exam findings and perform diagnostic examination maneuvers on simulated patients. Encounters were digitally recorded and scored again by another trained faculty member. Inter-rater reliability for each maneuver was estimated using type-2 intra-class correlations (ICC). Percentages of perfect scores for anticipation and performance were calculated. Pearson's correlation between anticipation and performance scores was computed for each maneuver and their relationship to diagnostic accuracy was tested with logistic regression. RESULTS: Inter-rater reliability was good (ICC between .69 and .87) for six exam maneuvers. Maneuver performance was overall poor, with no discriminatory maneuver performed correctly by more than two thirds of students, and one maneuver only performed correctly by 4 % of students. For the shoulder and knee stations, students were able to anticipate necessary discriminatory exam findings better than they could actually perform relevant exam maneuvers. The ability to anticipate a discriminatory finding correlated with the ability to perform the associated maneuver correctly, with the exception of the ability to perform maneuvers needed to diagnose a torn anterior cruciate ligament of the knee. Neither the ability to anticipate or perform was predictive of identifying correct diagnoses for the different cases. CONCLUSIONS: A novel musculoskeletal OSCE, based on principles of the hypothesis-driven physical examination, was able to identify significant deficiencies in examination skills needed to diagnose common disorders of the shoulder, back and knee amongst graduating medical students. In addition, the OSCE demonstrated that accurate anticipation of discriminatory examination findings correlates with ability to perform the associated maneuver; however, the ability to anticipate exceeds the ability to perform. Students do not appear to be using the physical exam to inform their diagnostic reasoning. The findings of this study have implications for both assessment and teaching of the musculoskeletal exam.

Retroperitoneal course of iliohypogastric, ilioinguinal, and genitofemoral nerves: A study to improve identification and excision during triple neurectomy.

Triple neurectomy of the iliohypogastric (IHN), ilioinguinal (IIN), and genitofemoral (GFN) nerves is an available treatment option for chronic groin pain when conservative measures are ineffective. This research study attempted to define the variability of IHN, IIN, and GFN by categorizing variation and establishing a relationship to clinically significant landmarks. 22 cadavers (43 specimens) were dissected. Age, gender, ethnicity, BMI, and pertinent medical history were recorded for each specimen. Nerve emergence, insertion, and split points were measured in relation to clinically significant landmarks. Retroperitoneal trajectories of IHN, IIN, and GFN were analyzed and categorized based on nerve branching patterns. IIN and IHN had three branching patterns - type A (47%) in which the IIH and IIN exit as separate branches; type B (26%) in which the IIH and IIN exit as a single bundle and split; and type C (28%) in which the IIH and IIN exit and do not split. The GFN had three branching patterns--type 1 (50%) in which the GFN exited from the psoas major and then split into the genital and femoral branches; type 2 (30%) in which the GFN exited and did not split; and type 3 (20%) in which the GFN exited the psoas major already split into the genital and femoral branches. Variations in the IHN, IIN, and GFN nerves outlined in this study will provide surgeons with clinically useful information aiding in successful and efficient localization of these nerves during retroperitoneal procedures, including laparoscopic triple neurectomy.

Branching patterns of the superficial peroneal nerve: implications for ankle arthroscopy and for anterolateral surgical approaches to the ankle.

Ankle arthroscopic procedures offer less postoperative morbidity with faster healing times than open surgical procedures but still have associated risks. Complication rates as high as 17% have been reported. One of the most commonly reported complications is iatrogenic damage to the superficial peroneal nerve, which can result in numbness, tingling, or painful neuralgia. In the present study, we attempted to better assess the location of the superficial peroneal nerve at the ankle to improve preoperative planning and reduce complication rates. Fifty ankle specimens were dissected. A concerted effort was made to classify the location of the superficial peroneal nerve according to the Takao branching pattern, zones of the ankle, and distance to anatomic landmarks. Through our dissections, we found that most ankles have 2 nerve branches at the level of the ankle joint (Takao type II) and that the location of the superficial peroneal nerve branches at the ankle correlated directly with the ankle width. Additionally, 68% of specimens contained a nerve branch located in zone 1, where the anterolateral portal is placed, and 12% had a branch in zone 5, the location of the anteromedial portal site. The results of the present study have confirmed the wide variation in nerve location at the level of the ankle joint and serve to highlight the need for extreme caution during surgical procedures at the ankle.

Transfer rates and use of post-acute care after surgery at critical access vs non-critical access hospitals.

IMPORTANCE: There is growing interest in the use of health care resources by critical access hospitals (CAHs), key providers of medical care for many rural populations. OBJECTIVE: To evaluate discharge practice patterns and use of post-acute care after surgical admissions at CAHs. DESIGN, SETTING, AND PARTICIPANTS: We used data from the Nationwide Inpatient Sample (2005-2009) and American Hospital Association to perform a retrospective cohort study of patients undergoing common inpatient surgical procedures at CAHs or non-CAHs. EXPOSURES: The CAH status of the admitting hospital. MAIN OUTCOMES AND MEASURES: Hospital transfer, discharge with post-acute care, or routine discharge. RESULTS: Among the 1283 CAHs and 3612 non-CAHs included in the American Hospital Association annual survey, 34.8% and 36.4%, respectively, reported data to the Nationwide Inpatient Sample. For each of 6 common inpatient surgical procedures, a greater proportion of patients from CAHs were transferred to another hospital (P < .01); however, patients discharged from CAHs were less likely to receive post-acute care for all but 1 of the procedures examined (P < .01, except transurethral resection of prostate, P = .76). After adjustment for patient and hospital factors, the higher likelihood of transfer by CAHs vs non-CAHs persisted for 3 procedures: hip replacement (odds ratio, 1.90; 95% CI, 1.01-3.57), colorectal cancer resection (3.37; 2.23-5.09), and cholecystectomy (1.67; 1.27-2.19) (P < .05 for each), but differences in the use of post-acute care did not. In subset analyses, Medicare beneficiaries treated in CAHs were less likely to be discharged with post-acute care after hip fracture repair (odds ratio, 0.65; 95% CI, 0.47-0.89) and hip replacement (0.70; 95% CI, 0.51-0.96). CONCLUSIONS AND RELEVANCE: Hospital transfers occur more often after surgical admissions at CAHs. However, the proportion of patients at CAHs using post-acute care is equal to or lower than that of patients treated in non-CAHs. These results will affect the ongoing debate concerning CAH payment policy and its implications for health care delivery in rural communities.

Branching patterns and localization of the common fibular (peroneal) nerve: an anatomical basis for planning safe surgical approaches.

PURPOSE: Given the severity and incidence of injury to the common fibular (peroneal) nerve (CFN), there is a need to further clarify its anatomical location and branching patterns. This project attempts to consolidate current anatomical understanding of this nerve and provide physicians with reproducible measurements regarding the CFN and its branches. METHODS: Dissections were performed on 50 specimens (28 cadavers), both fresh and preserved. The CFN was dissected from its emergence from the fibular tunnel to its anterior tibial recurrent nerve (ATRN), superficial fibular nerve (SFN), and deep fibular nerve (DFN) branches. The CFN branching patterns were assessed and all variations were categorized into four types. RESULTS: Several significant relationships were identified between observable traits and key anatomical characteristics of the CFN. A significant correlation was found between fibular length and distance from the tip of the fibula to the DFN/ATRN branch, as well as between fibular length and distance from the tibial tuberosity to the SFN/DFN and DFN/ATRN branches. An association was identified between length of exposed sub-cutaneous CFN and height. Thickness of the biceps femoris tendon correlated significantly with BMI. CONCLUSIONS: These findings allow physicians to better assess a patient's individual CFN anatomy based on correlations with measureable physical traits and will contribute to anatomic education and successful completion of various surgical, anesthetic, and physical therapy procedures.

Varied anatomy of the thumb pulley system: implications for successful trigger thumb release.

PURPOSE: The anatomical arrangement of the thumb pulley system continues to be revised through ongoing investigative research, changing our previous assumptions. This study demonstrates the components and anatomical features of this pulley system in an effort to improve surgical outcomes and to clarify current misconceptions. METHODS: Researchers procured 75 hand specimens from 41 adult cadavers through our institution's anatomical donations program. Dissections of the thumb and thenar compartment identified the various pulleys. A detailed analysis of the thumb pulleys was performed through various measurements. RESULTS: Four different pulley categories were identified: type I (n = 5), type II (n = 29), type III (n = 29), and type IV (n = 12). The variable annular pulley was present in 70 of 75 hands (93%) in 1 of 3 arrangements: transverse, oblique, or fused with the A1 pulley. CONCLUSIONS: The pulley system of the thumb is composed of 4 components, as opposed to the traditional view of only 3. Along with the A1 pulley, the additional variable annular pulley might contribute to stenosis in trigger thumb. This might necessitate a more extensive surgical incision and its partial release to relieve triggering. CLINICAL RELEVANCE: Understanding the anatomical configuration of the thumb pulley system will aid in the surgical attempt to resolve triggering while avoiding complications such as bowstringing of the flexor pollicis longus tendon and iatrogenic nerve injury.

Optical correlator based target detection, recognition, classification, and tracking.

A dedicated automatic target recognition and tracking optical correlator (OC) system using advanced processing technology has been developed. Rapidly cycling data-cubes with size, shape, and orientation are employed with software algorithms to isolate correlation peaks and enable tracking of targets in maritime environments with future track prediction. The method has been found superior to employing maximum average correlation height filters for which the correlation peak intensity drops off in proportion to the number of training images. The physical dimensions of the OC system may be reduced to as small as 2 in. × 2 in. × 3 in. (51 mm × 51 mm × 76 mm) by modifying and minimizing the OC components.

Musculoskeletal education in US medical schools: lessons from the past and suggestions for the future.

Despite the prevalence of musculoskeletal disorders in the United States, physicians have received inadequate training during medical school on how to examine, diagnose, and manage these conditions. This article provides an overview of the existing literature on undergraduate medical musculoskeletal education, including learning objectives, researched methodology, and currently utilized assessment tools. A discussion of challenges to and suggested approaches for the implementation of medical school musculoskeletal curricula is presented.

Acromioclavicular joint cyst formation.

Acromioclavicular joint (ACJ) cysts are an uncommon and unusual sequela associated with shoulder pathophysiology. The majority of literature on ACJ cysts consists of individual case reports with no definitive literature review currently available. In addition to a comprehensive literature review, four clinical cases are presented in this report. First described by Craig (1984), a total of 41 cases have been previously reported in the literature. Of these cases, five occurred with the rotator cuff musculature intact. The remaining 36 cases of ACJ cysts occurred in patients with a complete tear/avulsion of the rotator cuff. Previous attempts at compiling a complete record of all reported cases have combined several distinct conditions into a single category. This article presents two distinct etiologies for the pathogenesis of ACJ cyst formation. In the presence of an intact rotator cuff, a Type 1 cyst can form superficially and be limited to the ACJ. Following a massive or traumatic tear of the rotator cuff, mechanical instability of the humeral head can cause a deterioration of the inferior acromioclavicular capsule (cuff tear arthropathy) and an overproduction of synovial fluid. Overtime, a "geyser" of fluid can form between the glenohumeral and the ACJ, forming a Type 2 cyst. This differentiation and categorization is essential for appropriate classification and treatment.