Should Obtaining Informed Consent Be Considered an Entrustable Professional Activity? Insights From Whether and How Attendings Entrust Surgical Trainees

PURPOSE

Because residents are frequently delegated the task of obtaining consent early in their training, the American Association of Medical Colleges describes "obtaining informed consent" as a core entrustable professional activity (EPA) for medical school graduates. However, prior studies demonstrated that residents frequently perform this task without receiving formal instruction or assessment of competency. This study sought to understand how attending physicians decide to delegate obtaining informed consent for surgical procedures to trainees.

METHOD

The authors conducted a survey of attending surgeons at a university-based health care system of 6 affiliated teaching hospitals (October-December 2020) to collect data about current entrustment practices and attendings' knowledge, experience, and attitudes surrounding the informed consent process. Summary statistics and bivariate analyses were applied.

RESULTS

Eighty-five attending surgeons participated (response rate, 49.4%) from diverse specialties, practice types, and years in practice. Fifty-eight of 85 (68.2%) stated they "never" granted responsibility for the consent conversation to a trainee and 74/81 (91.4%) reported they typically repeated their own consent conversation whenever a trainee already obtained consent. The most common reasons they retained responsibility for consent were ethical duty (69/82, 84.1%) and the patient relationship (65/82, 79.3%), while less than half (40/82, 48.8%) described concerns about trainee competency. Reflecting on hypothetical clinical scenarios, increased resident competency did not correspond with increased entrustment (P = 0.27 - 0.62). Nearly all respondents (83/85, 97.7%) believed residents should receive formal training, however, only 41/85 (48.2%) felt additional training and assessment of residents might change their current entrustment practices.

CONCLUSIONS

Attendings view informed consent as an ethical and professional obligation that typically cannot be entrusted to trainees. This practice is discordant with previous literature studying residents' perspectives. Furthermore, resident competency does not play a predominant role in this decision, calling into question whether informed consent can be considered an EPA.

Surgical Residents' Awareness of the Costs of Common Operating Room Supplies

BACKGROUND

The Accreditation Council for Graduate Medical Education mandates that residency programs incorporate cost awareness into patient care. This presents a challenge for surgical residents because they must understand operating room costs in addition to other expenses. Trainees' understanding of operating room supply costs is not well understood.

METHODS

A survey was distributed to surgical residents (N = 73) at an urban, university-based residency program. Residents estimated the costs of 21 single-use operating room items. Descriptive statistics and a regression analysis were calculated.

RESULTS

The response rate was 62%. Respondents accurately estimated costs for a median of 7/21 items, with error ranging from 26% to 5438%. They substantially underestimated the three highest-cost items. Increasing post-graduate year did not improve estimation accuracy (β = .233, P = .138).

DISCUSSION

Residents have a poor understanding of single-use item costs, and this does not improve with post-graduate training, suggesting inefficiencies. There is opportunity to educate residents and ultimately decrease surgical health care costs.

Update on the Financial Well-Being of Surgical Residents in New England

BACKGROUND

Poor personal financial health has been linked to key components of health including burnout, substance abuse, and worsening personal relationships. Understanding the state of resident financial health is key to improving their overall well-being.

STUDY DESIGN

A secondary analysis of a survey of New England general surgery residents was performed to understand their financial well-being. Questions from the National Financial Capability Study were used to compare to an age-matched and regionally matched cohort.

RESULTS

Overall, 44% (250 of 570) of surveyed residents responded. Residents more frequently reported spending less than their income each year compared to the control cohort (54% vs 34%, p < 0.01). However, 17% (39 of 234) of residents reported spending more than their income each year. A total of 65% of residents (152 of 234), found it "not at all difficult" to pay monthly bills vs 17% (76 of 445) of the control cohort (p < 0.01). However, 32% (75 of 234) of residents reported it was "somewhat" or "very" difficult to pay monthly bills. Residents more frequently reported they "certainly" or "probably" could "come up with" $2,000 in a month compared to the control cohort (85% vs 62% p < 0.01), but 16% (37 of 234) of residents reported they could not. In this survey, 21% (50 of 234) of residents reported having a personal life insurance policy, 25% (59 of 234) had disability insurance, 6% (15 of 234) had a will, and 27% (63 of 234) had >$300,000 worth of student loans.

CONCLUSIONS

Surgical residents have better financial well-being than an age-matched and regionally matched cohort, but there is still a large proportion who suffer from financial difficulties.

How I Learned is How I Teach - Perspectives on How Faculty Surgeons Approach Informed Consent Education

OBJECTIVE

To understand the variability of surgical attending experience and perspectives regarding informed consent and how it impacts resident education DESIGN: A novel survey was distributed electronically to explore faculty surgeon's personal learning experience, knowledge, clinical practice, teaching preferences and beliefs regarding informed consent. Chi-square and Kruskal-Wallis testing was performed to look for associations and a cluster analysis was performed to elucidate additional patterns among.

SETTING

Single, tertiary, university-affiliated health care system (Yale New Haven Health in Connecticut), including 6 teaching hospitals.

PARTICIPANTS

Clinical faculty within the Department of Surgery.

RESULTS

A total of 85 surgeons responded (49% response rate), representing 17 specialties, both private practice and university and/or hospital-employed, with a range of years in practice. Across all ages, specialties, the most common method for both learning (86%) and teaching (82%) informed consent was observation of the attending. Respondents who stated they learned by observing attendings were more likely to report that they teach by having trainees observe them (OR 8.5, 95% CI 1.3-56.5) and participants who recalled learning by having attendings observe them were more likely to observe their trainees (OR 4.1, 95% CI 1.5-11.2).Cluster analysis revealed 5 different attending phenotypes with significant heterogeneity between groups. A cluster of younger attendings reported the least diverse learning experience and high levels of concern for legal liability and resident competency. They engaged in few strategies for teaching residents. By comparison, the cluster that reported the most diverse learning experience also reported the richest diversity of teaching strategies to residents but rarely allowed residents to perform consent with their patients. Meanwhile, 2 other cluster provided a more balanced experience with some opportunities for practice with patients and some diversity of teaching- these clusters, respectively, consist of older, experienced general surgeons and surgeons in trauma and/or critical care.

CONCLUSIONS

Surgeon's demographics, personal experiences, and specialty appear to significantly influence their teaching styles and the educational experience residents receive regarding informed consent.

Learning Environment is the Prevailing Factor in Surgical Residents' Favorite Rotations

OBJECTIVE

Understand the characteristics of residents' favorite rotations to improve the ability of educators to maximize positive learning experiences.

DESIGN

Novel cross-sectional survey developed through thematic analysis of focus groups with residents using 4-point Likert scales ranked from "Not at all important" to "Extremely important."

SETTING

Single university-affiliated urban hospital PARTICIPANTS: Clinical surgical residents BACKGROUND: Resident assessments of learning experiences vary between rotations leading to the development of "favorite" rotations.

MATERIALS AND METHODS

A novel survey instrument containing 31 characteristics divided into 4 thematic categories was developed following analysis of surgical resident focus groups. Clinical surgical residents were asked how important each characteristic was for determining their favorite rotation on a 4-point Likert Scale from "not at all important" to "extremely important." Two-sided independent sample T-tests were used.

RESULTS

The response rate was 59% (33/56) with proportional representation of postgraduate levels. Overall, 67% (22/33) of residents reported their favorite rotation was in their preferred specialty, 70% (23/33) reported their favorite rotation required >70 hours per week in the hospital, and 97% (32/33) of residents reported their favorite rotation required <2 days of clinic. Overall, the average ranking of the categories from most to least important was content (mean = 2.84, SD = 0.48), learning environment (mean = 2.67, SD = 0.57), working environment (mean = 2.38, SD = 0.56), and accomplishment (mean = 2.31, SD = 0.57). The only category with a statistically significant difference between junior and senior resident was content with seniors ranking it most important (mean = 3.35, SD = 0.93) compared to junior residents who ranked it least important (mean = 2.21, SD = 1.25), p = 0.01. Personal characteristics such as "Attendings cared about my learning" (mean = 3.56, SD = 0.50) and "I felt good at my job" (mean = 3.45, SD = 0.67), tended to be more important than structural characteristics such as "call schedule" (mean = 2.71, SD = 0.86), "formal didactics" (mean = 2.67, SD = 1.04), and "work-life balance" (mean = 2.70, SD = 0.99).

CONCLUSIONS

This study demonstrates a novel understanding of the factors that contribute to resident preferences for certain rotations. Junior and senior residents attribute importance differently, which may provide the basis for level-appropriate improvements. Personal factors tended to be more contributory than structural factors, highlighting additional dimensions to examine when considering how to optimize certain rotations.

Effect of Surgical Team Communication on Adherence to Opioid Discharge Guidelines in Post-Operative Inpatients

OBJECTIVE

Current opioid prescribing guidelines state that post-operative inpatients who do not receive opioids in the 24 hours preceding discharge do not require an opioid prescription on discharge. This study was designed to assess providers' understanding of opioid discharge guidelines and explore drivers of adherence.

DESIGN

An electronic survey was released which assessed knowledge of opioid discharge guidelines and probed surgical team communication. Kruskal-Wallis tests were used to determine differences between provider types. Spearman's correlation evaluated relationships between estimated and observed adherence to guidelines.

SETTING

Yale New-Haven Hospital, (tertiary, university-based) PARTICIPANTS: Surgical residents, advanced practice providers (APPs) and attendings who discharged inpatients with opioids between November 2017-August 2019 RESULTS: The response rate was 36% (90/253), including 36% (49/136) of residents, 23% (13/56) of APPs, and 46% (28/61) of attendings. Seventy eight percent of participants believed patients who met the guideline should "never" or "sometimes" receive opioids on discharge. There was a significant difference between attending preferences and what residents (H²₂ = 202.7, p = 0.0001) and APPs (H²₂ = 24.6, p = 0.003) believed were the attending's preferences. Eleven percent of attendings preferred their patients to "most of the time" or "always" receive opioids on discharge, while 45% of residents and 54% of APPs reported the same. Overall, 57% of attendings reported they "most of the time" or "always" communicated their discharge preferences while 12% of residents (H²₂ = -20.4, p = 0.0003) and 8% of APPs (H²₂ = -23.5, p = 0.003) reported the same. There was no correlation between all groups' estimated adherence to the guidelines and observed adherence (r_s = 0.135, p = 0.206).

CONCLUSIONS

This study demonstrates that surgical residents, APPs, and attendings are aware of the guideline but breakdowns in communication between the attending and the surgical team may contribute to deviation from this guideline. Improving communication may lead to improved adherence to post-operative opioid discharge prescribing guidelines.

Video Coaching in Surgical Education: Utility, Opportunities, and Barriers to Implementation

OBJECTIVE

This review discusses the literature on Video-Based Coaching (VBC) and explores the barriers to widespread implementation.

DESIGN

A search was performed on Scopus and PubMed for the terms "operation," "operating room," "surgery," "resident," "house staff," "graduate medical education," "teaching," "coaching," "assessment," "reflection," "camera," and "video" on July 27, 2021, in English. This yielded 828 results. A single author reviewed the titles and abstracts and eliminated any results that did not pertain to operative VBC or assessment. All bibliographies were reviewed, and appropriate manuscripts were included in this study. This resulted in a total of 52 manuscripts included in this review.

SETTING/PARTICIPANTS

Original, peer-reviewed studies focused on VBC or assessment.

RESULTS

VBC has been both subjectively and objectively found to be a valuable educational tool. Nearly every study of video recording in the operating room found that subjects, including surgical residents and seasoned surgeons alike, overwhelmingly considered it a useful, non-redundant adjunct to their training. Most studies that evaluated skill acquisition via standardized assessment tools found that surgical residents who underwent a VBC program had significant improvements compared to their counterparts who did not undergo video review. Despite this evidence of effectiveness, fewer than 5% of residency programs employ video recording in the operating room. Barriers to implementation include significant time commitments for proposed coaching curricula and difficulty with integration of video cameras into the operating room.

CONCLUSIONS

VBC has significant educational benefits, but a scalable curriculum has not been developed. An optimal solution would ensure technical ease and expediency, simple, high-quality cameras, immediate review, and overcoming entrenched surgical norms and culture.

The Reporting of Race and Ethnicity in Surgery Literature

Importance

The reporting of race provides transparency to the representativeness of data and helps inform health care disparities. The International Committee of Medical Journal Editors (ICMJE) developed recommendations to promote quality reporting of race; however, the frequency of reporting continues to be low among most medical journals.

Objective

To assess the frequency as well as quality of race reporting among publications from high-ranking broad-focused surgical research journals.

Design, Setting, and Participants

A literature review and bibliometric analysis was performed examining all human-based primary research articles published in 2019 from 7 surgical journals: JAMA Surgery, Journal of the American College of Surgeons, Annals of Surgery, Surgery, American Journal of Surgery, Journal of Surgical Research, and Journal of Surgical Education. The 5 journals that stated they follow the ICMJE recommendations were analyzed against the 2 journals that did not explicitly claim adherence.

Main Outcomes and Measures

Measured study outcomes included race reporting frequency and use of the ICMJE recommendations for quality reporting of race.

Results

A total of 2485 publications were included in the study. The mean (SD) frequency of reporting of race and ethnicity in publications of ICMJE vs non-ICMJE journals was 32.8% (8.4) and 32.0% (20.9), respectively (P = .72). Adherence to ICMJE recommendations for reporting race was more frequent in ICMJE journals than non-ICMJE journals (mean [SD] of 73.1% [17.8] vs 37.0% [10.2]; P < .001).

Conclusions and Relevance

The frequency of race and ethnicity reporting among surgical journals is low. A journal's statement of adherence to ICMJE recommendations did not affect the frequency of race and ethnicity reporting; however, there was an increase in the use of ICMJE quality metrics. These findings suggest the need for increased and more standardized reporting of racial and ethnic demographic data among surgical journals.

Residency Program Use of Social Media in the COVID-19 Era: An Applicant's Perspective

General surgery residency programs' use of social media has exploded since early spring 2020, as it became clear that the COVID-19 pandemic would prevent away rotations and in-person interviews. Faced with the prospect of ranking programs they cannot visit, applicants are becoming reliant on programs' use of social media to showcase program culture, now a key recruitment tool. However, proper etiquette for applicant engagement with programs' social media accounts is unclear. Who administers these accounts - residents, program directors, program coordinators, or marketing staff? The subjectivity of criteria for "potentially unprofessional" content may pose disproportionate risks to female applicants and applicants of color. From this applicant's perspective, programs' recent use of social media has been informative and humanizing. It is our hope that departments, programs, and residents continue to post on social media throughout the application cycle. However, we applicants would benefit from clear guidance and expectations as to how to engage with residency programs via social media.

Characterizing the social media footprint of general surgery residency programs

Background

The medical community has increasingly embraced social media for a variety of purposes, including trainee education, research dissemination, professional networking, and recruitment of trainees and faculty. Platform choice and usage patterns appear to vary by specialty and purpose, but few studies comprehensively assess programs’ social media presence. Prior studies assessed general surgery departments’ Twitter use but omitted additional social media platforms and residency-specific accounts.

Objective

This study sought to broadly characterize the social media footprint of U.S. general surgery residency programs.

Methods

Using a protocolized search of program websites, social media platforms (Twitter, Facebook, Instagram, LinkedIn), and internet search, cross-sectional data on social media usage in March 2020 were collected for programs, their affiliated departments, their program directors (PDs), and their assistant/associate PDs (APDs).

Results

318 general surgery residency programs, 313 PDs, and 296 APDs were identified. 47.2% of programs had surgery-specific accounts on ≥1 platform. 40.2% of PDs and APDs had ≥1 account on Twitter and/or LinkedIn. Program type was associated with social media adoption and Twitter utilization, with lower usage among university-affiliated and independent programs (p<0.01).

Conclusions

Most general surgery residencies, especially non-university-based programs, lacked any department or residency accounts across Twitter, Facebook, and Instagram by March 2020. These findings highlight opportunities for increased social media engagement and act as a pre-pandemic baseline for future investigations of how the shift to virtual trainee education, recruitment, conferences, and clinical care affect social media use.

Driving Safety Among Surgical Residents in the Era of Duty Hour Restrictions

OBJECTIVE

Fatigued driving is a known contributor to adverse motor vehicle events (AMVEs), defined as crashes and near misses. Surgical trainees work long and irregular hours; the safety of work-related driving since the introduction of work hour regulations has not yet been studied in this population. We aimed to assess the impact of fatigue on driving safety and explore perceptions of a funded rideshare program.

DESIGN

An electronic survey was delivered and inquired in retrospective fashion about fatigue and sleepiness while driving, occurrences of AMVEs, and projected use of a funded rideshare program as a potential solution to unsafe driving. Chi-square testing determined categorical differences between response choices.

SETTING

Yale University School of Medicine, Department of Surgery, New Haven, CT-a general surgery program with 4 urban clinical sites positioned along a roughly twenty mile stretch of interstate highway in Southeastern Connecticut.

PARTICIPANTS

General Surgery residents at the Yale University School of Medicine.

RESULTS

Of 58 respondents (81% response rate), 97% reported that fatigue compromised their safety while driving to or from work. Eighty-three percent reported falling nearly or completely asleep, and 22% reported AMVEs during work-related driving. Junior residents were more likely than Seniors to drive fatigued on a daily-to-weekly basis (69% vs 47%, p = 0.02) and twice as likely to fall asleep on a weekly-to-monthly basis (67% vs 33%, p = 0.02). Despite this, only 7% of residents had ever hired a ride service when fatigued, though 88%, would use a free rideshare service if provided.

CONCLUSIONS

Work-related fatigue impairs the driving safety of nearly all residents, contributing to frequent AMVEs. Currently, few residents hire rideshare services. Eliminating the cost barrier by funding a rideshare and encouraging its routine use may protect surgical trainees and other drivers.

Surgical Education in the Time of COVID: Understanding the Early Response of Surgical Training Programs to the Novel Coronavirus Pandemic

OBJECTIVE

Describe the early impact of the COVID-19 pandemic on general surgery residency training nationwide.

DESIGN

A 31-question electronic survey was distributed to general surgery program directors. Qualitative data underwent iterative coding analysis. Quantitative data were evaluated with summary statistics and bivariate analyses.

PARTICIPANTS

Eighty-four residency programs (33.6% response rate) with representation across US geographic regions, program affiliations, and sizes.

RESULTS

Widespread changes were observed in the surgical training environment. One hundred percent of programs reduced the number of residents on rounds and 95.2% reduced the size of their in-hospital resident workforce; on average, daytime staffing decreased by nearly half. With telehealth clinics (90.5%) and remote inpatient consults (26.2%), both clinical care and resident didactics (86.9%) were increasingly virtual, with similar impact across all program demographics. Conversely, availability of some wellness initiatives was significantly higher among university programs than independent programs, including childcare (51.2% vs 6.7%), housing (41.9% vs 13.3%), and virtual mental health services (83.7% vs 53.3%).

CONCLUSIONS

Changes in clinical care delivery dramatically reduced in face-to-face learning opportunities for surgical trainees during the COVID-19 pandemic. While this effect had equal impact across all program types, sizes, and geographies, the same cannot be said for wellness initiatives. Though all programs initiated some strategies to protect resident health, the disparity between university programs and independent programs may be cause for action.

What's it Worth?: The Costs and Benefits of an Initiative to Decrease Post-Call Fatigued Driving Among Surgery Residents

BACKGROUND

In 2017 the ACGME enacted new regulations requiring sponsoring institutions to ensure "safe transportation options for residents who may be too fatigued to safely return home." We investigate here the impact of a pilot "Safe Ride" program designed to mitigate the risks of fatigued driving.

METHODS

During a 2-month pilot period at a single university-affiliated general surgery residency with four urban clinical sites, all residents (n = 72) were encouraged to hire a rideshare (e.g., Uber, Lyft) to and from 24-h clinical shifts if they felt too fatigued to drive safely. The cost of the rideshare was fully reimbursed to the resident. The impact of this intervention was evaluated using utilization data and a post-intervention resident survey.

RESULTS

A total of 16.6% of trainees utilized a rideshare at least one time. Sixty-three post-call rides were taken, predominantly by junior residents (92.4%) and for commutes greater than 15 miles (91%). The cost for the 60-day pilot was $3030. Comparing pre-intervention to post-intervention data, there was a significant improvement in the reported frequency of falling asleep or nearly asleep while driving (P < 0.001). Trainees nearly unanimously (98%) supported efforts to make the program permanent.

DISCUSSION

Driving while fatigued is common among surgical residents, with increased risk among junior residents, during longer commutes and following longer shifts. A reimbursed rideshare program effectively targets these risk factors and was associated with a significant decrease in rates of self-reported fatigued driving. Future efforts should focus on strategies to promote use of reimbursed rideshare programs while remaining cost efficient.

Creating an Opioid Recommendation Card for Trainees: Methods, Use, and Impact

BACKGROUND

In academic hospitals, surgical residents write most of the postoperative prescriptions; yet, few residents are trained on postoperative analgesia. This leads to wide variability in practices and often excess opioid prescribing. We sought to create an opioid guideline pocket card for surgical residents to access when prescribing opioids postoperatively and to evaluate the impact of this initiative.

METHODS

A comprehensive literature review was conducted to generate evidence-based procedure-specific opioid recommendations; additional recommendations were formulated via consensus opinion from surgical divisions at an academic institution. A pocket-sized guideline card was developed to include these procedure-specific recommendations as well as opioid guidelines for discharges after inpatient stays, non-opioid analgesic recommendations, access to opioid safety and disposal instructions for patients discharge, an equianalgesic dosing chart, and instructions for naloxone use. The card was distributed to all General Surgery house staff at a university-affiliated hospital in the spring of 2018. Following the distribution, trainees were surveyed on their use of the card. Descriptive statistics were used to analyze the survey.

RESULTS

Of 85 trainees, 62 (72.9%) responded to the survey in full; 58% use the card regularly. Of the 27 junior resident respondents, 70.4% use the card at least monthly including 48.1% who use the card daily-to-weekly. Overall, 81.6% of residents changed their opioid-prescribing practices because of this initiative and 89.8% believe the card should continue to be distributed and used.

DISCUSSION

An evidence-based guideline card for postoperative analgesia is highly valued and utilized by surgical trainees, especially those most junior in their training.

"Let's Get the Consent Together": Rethinking How Surgeons Become Competent to Discuss Informed Consent

OBJECTIVE

Eliciting informed consent is a clinical skill that many residents are tasked to conduct without sufficient training and before they are competent to do so. Even senior residents and often attending physicians fall short of following best practices when conducting consent conversations.

DESIGN

This is a perspective on strategies to improve how residents learn to collect informed consent based on current literature.

CONCLUSIONS

We advocate that surgical educators approach teaching informed consent with a similar framework as is used for other surgical skills. Informed consent should be defined as a core clinical skill for which attendings themselves should be sufficiently competent and residents should be assessed through direct observation prior to entrustment.

Can hybridization cause local extinction: a case for demographic swamping of the Australian native Senecio pinnatifolius by the invasive Senecio madagascariensis?

Hybridization between native and invasive species can have several outcomes, including enhanced weediness in hybrid progeny, evolution of new hybrid lineages and decline of hybridizing species. Whether there is a decline of hybridizing species largely depends on the relative frequencies of parental taxa and the viability of hybrid progeny. Here, the individual- and population-level consequences of hybridization between the Australian native Senecio pinnatifolius and the exotic Senecio madagascariensis were investigated with amplified fragment length polymorphism (AFLP) markers, and this information was used to estimate the annual loss of viable seeds to hybridization. A high frequency (range 8.3-75.6%) of hybrids was detected in open pollinated seeds of both species, but mature hybrids were absent from sympatric populations. A hybridization advantage was observed for S. madagascariensis, where significantly more progeny than expected were sired based on proportional representation of the two species in sympatric populations. Calculations indicated that S. pinnatifolius would produce less viable seed than S. madagascariensis, if hybridization was frequency dependent and S. madagascariensis reached a frequency of between 10 and 60%. For this native-exotic species pair, prezygotic isolating barriers are weak, but low hybrid viability maintains a strong postzygotic barrier to introgression. As a result of asymmetric hybridization, S. pinnatifolius would appear to be under threat if S. madagascariensis increases numerically in areas of contact.

The effect of elevated hydrostatic pressure on the spectral absorption of deep-sea fish visual pigments

The effect of hydrostatic pressure (0.1-54 MPa, equivalent to pressures experienced by fish from the ocean's surface to depths of ca. 5,400 m) on visual pigment absorption spectra was investigated for rod visual pigments extracted from the retinae of 12 species of deep-sea fish of diverse phylogeny and habitat. The wavelength of peak absorption (lambda(max)) was shifted to longer wavelengths by an average of 1.35 nm at 40 MPa (a pressure approximately equivalent to average ocean depth) relative to measurements made at one atmosphere (ca. 0.1 MPa), but with little evidence of a change in absorbance at the lambda(max). We conclude that previous lambda(max) measurements of deep-sea fish visual pigments, made at a pressure close to 0.1 MPa, provide a good indication of lambda(max) values at higher pressures when considering the ecology of vision in the deep-sea. Although not affecting the spectral sensitivity of the animal to any important degree, the observed shift in lambda(max) may be of interest in the context of understanding opsin-chromophore interaction and spectral tuning of visual pigments.

Effects of various treatments on the quantitative recovery of endotoxin from water-soluble metalworking fluids

Three extraction methods were compared for their effectiveness in the quantitative removal of endotoxin from unused and used bulk water-soluble metalworking fluid (MWF) samples. Soluble, synthetic, and semisynthetic fluids were studied. The three modes of extraction consisted of (1) pyrogen-free water (PFW); (2) PFW and Tween 20 (polyoxyethylene sorbitan monolaurate); and (3) PFW, Tween 20, and sonication. Results suggest that vigorous recovery methods yield higher amounts of endotoxin from MWF samples than mild recovery methods in PFW alone. Additional studies are required to aid in the understanding of the factors that significantly affect endotoxin extraction yields from these fluids.

Preliminary report on the results of the second phase of a round- robin endotoxin assay study using cotton dust

In an on-going endotoxin assay study, a two-part interlaboratory endotoxin assay study has been completed. The purpose of the study was to compare the variation in assay results between different laboratories, and, if the variation was high, to see if a common protocol would reduce the variation. In both parts of the study, membrane filters laden with the same approximate amount and type of cotton dust were sent for analysis to laboratories that "routinely" perform endotoxin analyses. First, each of these laboratories performed the analysis using the methodology common to its laboratory. In the second part of the study, membrane filters with cotton dust were again sent to the same laboratories where the analyses were performed as before but with a common extraction protocol. The preliminary results from the first phase of the study have been collected and showed that intra-laboratory variations were small, but large and significant interlaboratory variation was observed. The results were reported elsewhere. The preliminary results from the second part of the study consisting of the data currently collected are presented here. Again, intra-laboratory variations were small, but, also again, large and significant inter-laboratory variation was observed. However, in this part of the study, the range between the highest and lowest average results was narrower than in the first part of the study. Influence of the assay kit type was examined. The variation within assay kit type was small but significant differences in results were observed between assay kit types. The findings suggest that endotoxin concentration in samples can be ranked within laboratories, but not necessarily between laboratories. However, some of the variation between laboratories has been reduced by a common extraction protocol which suggests the possibility of further standardization that may lead to better comparability between laboratories.

Validation of retroviral detection for rodent cell-derived products and gene therapy applications

The availability of sensitive assays for detecting infectious murine retroviruses has become critical for the development and acceptance of a number of biopharmaceuticals, including monoclonal antibody-derived products and gene therapy vectors. Comparative studies demonstrated that the PG4 S+L- retrovirus infectivity test routinely yields higher titres than the mink cell test for xenotropic, amphotrophic and MCF murine retroviruses. A validation study for the PG4 S+L- assay demonstrated very good linearity (r2 of 0.95 to 0.99), reproducibility within a study (+/-0.35 log10 units), and precision between tests (+/-0.45 log10 units). Interference (or selectivity) in the presence of a non-specific antibody was insignificant (less than 0.2 log10 units). Sensitivity levels established from measurements as virus titres approach zero demonstrated a threshold value of 2-3 focus forming units (FFU)/ml. Two methods for increasing assay sensitivity were used including: (i) increased product samplings combined with a Poisson distribution analysis, and (ii) a 14-day co-cultivation with Mus dunni cells. Each of these methods was shown to increase sensitivity by at least one log10 unit. Murine retroviruses may also be detected by a less sensitive immunofluorescence assay (IFA) using specific monoclonal antibodies; this assay is essential for detecting certain recombinant ecotropic MuLVs. In summary, murine retroviral detection ranked by sensitivity is mink S+L- < IFA with monoclonal antibodies < PG4 S+L- < Mus dunni co-cultivation followed by PG4 S+L-.

Allograft safety: viral inactivation with bone demineralization

A study was performed to validate the effectiveness of a bone demineralization process with respect to its inactivation of viruses. The viruses selected for study included human immunodeficiency virus (HIV), duck hepatitis B virus (a model for human hepatitis B), bovine viral diarrheal virus (a model for human hepatitis C), human cytomegalovirus, and human poliovirus (a model for small nonenveloped viruses, e.g., hepatitis A). This study was performed in compliance with Good Laboratory Practice regulations using validation methodology similar to that used to ensure the safety of blood derivatives and other products. Use of the bone demineralization process described in this report resulted in a reduction in infectivity of greater than one million (10(6)) for all viruses and as much as one trillion (10(12)) for the poliovirus.