Brenda K. Zierler

Management of Massive and Submassive Pulmonary Embolism, Iliofemoral Deep Vein Thrombosis, and Chronic Thromboembolic Pulmonary Hypertension A Scientific Statement From the American Heart Association

Venous thromboembolism (VTE) is responsible for the hospitalization of >250 000 Americans annually and represents a significant risk for morbidity and mortality. Despite the publication of evidence-based clinical practice guidelines to aid in the management of VTE in its acute and chronic forms, the clinician is frequently confronted with manifestations of VTE for which data are sparse and optimal management is unclear. In particular, the optimal use of advanced therapies for acute VTE, including thrombolysis and catheter-based therapies, remains uncertain. This report addresses the management of massive and submassive pulmonary embolism (PE), iliofemoral deep vein thrombosis (IFDVT),and chronic thromboembolic pulmonary hypertension (CTEPH). The goal is to provide practical advice to enable the busy clinician to optimize the management of patients with these severe manifestations of VTE. Although this document makes recommendations for management, optimal medical decisions must incorporate other factors, including patient wishes, quality of life, and life expectancy based on age and comorbidities. The appropriateness of these recommendations for a specific patient may vary depending on these factors and will be best judged by the bedside clinician.

Current trends in interprofessional education of health sciences students: A literature review

There is a pressing need to redesign health professions education and integrate an interprofessional and systems approach into training. At the core of interprofessional education (IPE) are creating training synergies across healthcare professions and equipping learners with the collaborative skills required for todays complex healthcare environment. Educators are increasingly experimenting with new IPE models, but best practices for translating IPE into interprofessional practice and team-based care are not well defined. Our study explores current IPE models to identify emerging trends in strategies reported in published studies. We report key characteristics of 83 studies that report IPE activities between 2005 and 2010, including those utilizing qualitative, quantitative and mixed method research approaches. We found a wide array of IPE models and educational components. Although most studies reported outcomes in student learning about professional roles, team communication and general satisfaction with IPE activities, our review identified inconsistencies and shortcomings in how IPE activities are conceptualized, implemented, assessed and reported. Clearer specifications of minimal reporting requirements are useful for developing and testing IPE models that can inform and facilitate successful translation of IPE best practices into academic and clinical practice arenas.

Ultrasonography and Diagnosis of Venous Thromboembolism

Abstract—Venous thromboembolism (VTE) consists of two related conditions: pulmonary embolism (PE) and deep vein thrombosis (DVT). Objective testing for VTE is crucial because the clinical diagnosis is nonspecific and insensitive, and the consequences of a missed diagnosis are serious. The purpose of this review is to discuss the utility of venous ultrasonography as the foundation for diagnosis of acute lower extremity DVT. The effectiveness and practicality of venous ultrasonography as a stand-alone examination versus theoretically attractive, but perhaps less practical, combined approaches of ultrasonography with clinical probability assessment and D-dimer testing in the diagnosis of acute DVT is also addressed. Finally, the role of venous ultrasonography in a diagnostic algorithm for suspected PE is discussed.

Interprofessional education in team communication: working together to improve patient safety

Background Communication failures in healthcare teams are associated with medical errors and negative health outcomes. These findings have increased emphasis on training future health professionals to work effectively within teams. The Team Strategies and Tools to Enhance Performance and Patient Safety (TeamSTEPPS) communication training model, widely employed to train healthcare teams, has been less commonly used to train student interprofessional teams. The present study reports the effectiveness of a simulation-based interprofessional TeamSTEPPS training in impacting student attitudes, knowledge and skills around interprofessional communication. Methods Three hundred and six fourth-year medical, third-year nursing, second-year pharmacy and second-year physician assistant students took part in a 4 h training that included a 1 h TeamSTEPPS didactic session and   three 1 h team simulation and feedback sessions. Students worked in groups balanced by a professional programme in a self-selected focal area (adult acute, paediatric, obstetrics). Preassessments and postassessments were used for examining attitudes, beliefs and reported opportunities to observe or participate in team communication behaviours. Results One hundred and forty-nine students (48.7%) completed the preassessments and postassessments. Significant differences were found for attitudes toward team communication (p<0.001), motivation (p<0.001), utility of training (p<0.001) and self-efficacy (p=0.005). Significant attitudinal shifts for TeamSTEPPS skills included, team structure (p=0.002), situation monitoring (p<0.001), mutual support (p=0.003) and communication (p=0.002). Significant shifts were reported for knowledge of TeamSTEPPS (p<0.001), advocating for patients (p<0.001) and communicating in interprofessional teams (p<0.001). Conclusions Effective team communication is important in patient safety. We demonstrate positive attitudinal and knowledge effects in a large-scale interprofessional TeamSTEPPS-based training involving four student professions.

Measuring the impact of interprofessional education on collaborative practice and patient outcomes.

Interest in interprofessional education (IPE) and collaborative practice continue to grow (Frenk et al., 2010; Cox & Naylor, 2013) but whether IPE improves clinical outcomes is uncertain. A recent ...

Shear stress regulates smooth muscle proliferation and neointimal thickening in porous polytetrafluoroethylene grafts.

High shear stress appears to decrease wall thickening in diseased arteries and vascular grafts. To determine if increased shear stress diminishes smooth muscle (SMC) proliferation, we studied the effect of increased blood flow on neointimal thickening in porous polytetrafluoroethylene grafts implanted in baboons. An aorto-aortic 5-mm graft was placed in tandem with a pair of aorto-iliac 5-mm grafts, so that the proximal graft supplied all flow to both distal grafts. At 12 weeks, calculated luminal shear stress in proximal grafts was twice that in distal grafts (24 +/- 8 versus 11 +/- 5 dynes/cm2; p less than 0.05). All grafts were completely endothelialized. The neointimal cross-sectional area in proximal grafts was about half as large as in distal grafts (3.36 +/- 1.61 versus 5.93 +/- 0.61 mm2; p less than 0.05). Proximal grafts also had significantly less SMC proliferation (0.14 +/- 0.05% versus 0.24 +/- 0.10%; p less than 0.05) and SMC volume (6.1 +/- 4.0 versus 12.4 +/- 2.6 mm3/cm graft; p less than 0.01) when compared with distal grafts. We conclude that the elevation in shear stress in the proximal graft, which remained within the physiological range, inhibits SMC proliferation and neointimal thickening in these grafts.

Determinants of chronic venous disease after acute deep venous thrombosis

PURPOSE The purpose of this investigation was to evaluate the relationship between the presenting features of an acute deep venous thrombosis (DVT), the subsequent natural history of the thrombus, and the ultimate outcome as defined according to the Society for Vascular Surgery and the North American Chapter of the International Society for Cardiovascular Surgery reporting standards in venous disease. METHODS Patients with an acute DVT were followed with serial clinical and ultrasound examinations. Thrombus extent within 7 venous segments was scored retrospectively according to the reporting standards (scores ranged from 0 to 3), and segmental reflux was scored as present (1) or not present (0). The initial and final thrombus scores, the rates of recanalization and rethrombosis, and the total reflux scores were then calculated from these grading scales and related to ultimate chronic venous disease (CVD) classification. RESULTS Sixty-eight patients with an acute DVT in 73 limbs were followed for 18 to 110 months (mean, 55 +/- 26 months). At the completion of the follow-up period, 20 extremities (27%) were asymptomatic (class 0), 13 (18%) had pain or prominent superficial veins (class 1), 25 (34%) had manifested edema (class 3), 13 (18%) had developed hyperpigmentation (class 4), and 2 (3%) had developed ulceration (class 5). In a univariate analysis, CVD classification was correlated with the reflux score (P =.003) but not with the initial or final thrombus score or with the rate of recanalization or rethrombosis. In a multivariate model of features documented at presentation, only the tibial thrombosis score was a significant predictor of CVD classification (R2 =.06). Outcome was better predicted (R2 =.29) with a model that included variables defined during follow-up the final reflux score, the final popliteal score, and the rate of recanalization. CONCLUSION The ability to predict the severity of CVD after an acute DVT is currently limited, although the natural history appears more important than the presenting features of the event. The extent of reflux, the presence of persistent popliteal obstruction, and the rate of recanalization are related to ultimate CVD classification, but other determinants remain to be identified.

Challenges to Using an Electronic Personal Health Record by a Low-income Elderly Population

Background Electronic personal health records (PHRs) are increasingly recognized and used as a tool to address various challenges stemming from the scattered and incompatible personal health information that exists in the contemporary US health care system. Although activity around PHR development and deployment has increased in recent years, little has been reported regarding the use and utility of PHRs among low-income and/or elderly populations. Objective The aim was to assess the use and utility of PHRs in a low-income, elderly population. Methods We deployed a Web-based, institution-neutral PHR system, the Personal Health Information Management System (PHIMS), in a federally funded housing facility for low-income and elderly residents. We assessed use and user satisfaction through system logs, questionnaire surveys, and user group meetings. Results Over the 33-month study period, 70 residents participated; this number was reduced to 44 by the end of the study. Although the PHIMS was available for free and personal assistance and computers with Internet connection were provided without any cost to residents, only 13% (44/330) of the eligible residents used the system, and system usage was limited. Almost one half of the users (47%, 33/70) used the PHIMS only on a single day. Use was also highly correlated with the availability of in-person assistance; 77% of user activities occurred while the assistance was available. Residents’ ability to use the PHR system was limited by poor computer and Internet skills, technophobia, low health literacy, and limited physical/cognitive abilities. Among the 44 PHIMS users, 14 (32%) responded to the questionnaire. In this selected subgroup of survey participants, the majority (82%, 9/11) used the PHIMS three times or more and reported that it improved the quality of overall health care they received. Conclusions Our findings suggest that those who can benefit the most from a PHR system may be the least able to use it. Disparities in access to and use of computers, the Internet, and PHRs may exacerbate health care inequality in the future.

Accuracy of duplex scanning for measurement of arterial volume flow

This study examined the accuracy of duplex ultrasound measurements of volume flow in a baboon model. Volume flow (Vf) through the external iliac artery was calculated from measurements of blood velocity averaged over several cardiac cycles (time-averaged velocity [TAV]) and vessel cross-sectional area (A) measured from the B-mode image: Vf = TAV x A. Fourteen anesthetized baboons were studied with a duplex scanner with a 7 MHz imaging transducer and 5 MHz pulsed Doppler. B-mode ultrasound measurements of external iliac artery diameters (2.5 +/- 0.2 mm) were used for calculation of cross-sectional area. Timed blood collections obtained through a cannula inserted into the common femoral artery and TAV measurements were obtained simultaneously during 6 to 15-second intervals. These measurements were repeated three to five times per animal with different flow rates each time. Flow rates ranged from 56 to 280 ml/min (170 +/- 54 ml/min). Average velocity was 55 +/- 17 cm/sec. There was no significant difference between the two methods of volume flow measurement (Student t test). Linear regression analysis revealed a high degree of correlation (r = 0.90, slope 0.95, and p = 0.0001). The absolute percentage error was 13% +/- 8%. Volume flow measured by duplex scanning correlates highly with timed blood collections. This method has potential application for the evaluation of diseased arteries and bypass grafts whose rates of flow and waveform patterns are similar to those of this experiment.

Interprofessional Education and Practice Guide No. 3: Evaluating interprofessional education.

Abstract We have witnessed an ongoing increase in the publication of evaluation work aimed at measuring the processes and outcomes related to a range of interprofessional education (IPE) activities and initiatives. Systematic reviews of IPE have, however, suggested that while the quality of evaluation studies is improving, there continues to be a number of empirical weaknesses with this work. In an effort to enhance the quality of IPE evaluation studies, this guide provides a series of ideas and suggestions about how to undertake a robust evaluation of an IPE event. The guide presents a series of key lessons for colleagues to help them undertake a good quality IPE evaluation, covering a range of methodological, practical and ethical issues. These include: the formation of evaluation questions, use of evaluation models and theoretical perspectives, advice about the selection of qualitative, quantitative and mixed methods evaluation designs, managing evaluation resources, and ideas about disseminating evaluation results to the broader IPE community. It is anticipated that this guide will assist IPE colleagues in undertaking high-quality evaluation in order to provide valuable evidence for different stakeholders, and also help inform the scholarly knowledge for the interprofessional field.