A multisite feasibility randomized clinical trial of mindfulness-based resilience training for aggression, stress, and health in law enforcement officers

BACKGROUND

Law enforcement officers (LEOs) are exposed to significant stressors that can impact their mental health, increasing risk of posttraumatic stress disorder, burnout, at-risk alcohol use, depression, and suicidality. Compromised LEO health can subsequently lead to aggression and excessive use of force. Mindfulness training is a promising approach for high-stress populations and has been shown to be effective in increasing resilience and improving mental health issues common among LEOs.

METHODS

This multi-site, randomized, single-blind clinical feasibility trial was intended to establish optimal protocols and procedures for a future full-scale, multi-site trial assessing effects of mindfulness-based resilience training (MBRT) versus an attention control (stress management education [SME]) and a no-intervention control, on physiological, attentional, and psychological indices of stress and mental health. The current study was designed to enhance efficiency of recruitment, engagement and retention; optimize assessment, intervention training and outcome measures; and ensure fidelity to intervention protocols. Responsiveness to change over time was examined to identify the most responsive potential proximate and longer-term assessments of targeted outcomes.

RESULTS

We observed high feasibility of recruitment and retention, acceptability of MBRT, fidelity to assessment and intervention protocols, and responsiveness to change for a variety of putative physiological and self-report mechanism and outcome measures.

CONCLUSIONS

Results of this multi-site feasibility trial set the stage for a full-scale, multi-site trial testing the efficacy of MBRT on increasing LEO health and resilience, and on decreasing more distal outcomes of aggression and excessive use of force that would have significant downstream benefits for communities they serve.

TRIAL REGISTRATION

ClinicalTrials.gov, NCT03784846 . Registered on December 24th, 2018.

Psychometric properties of the Buss-Perry Aggression Questionnaire-short form among law enforcement officers

Repeatedly capturing national headlines, excessive law enforcement officer (LEO) use of force in critical incident encounters is one of the most divisive human rights issues in the United States. Valid and reliable measures of potential precursors to LEO excessive use of force, such as aggression, are needed. The Buss-Perry Aggression Questionnaire-short form (BPAQ-SF) is a validated measure of aggression across various populations; however, evaluation of this easily administered measure in high-stress, frontline populations such as LEOs is limited. The primary goal of this study was to evaluate the validity, reliability, and sensitivity to change the BPAQ-SF in a sample of LEOs. A confirmatory factor analysis suggested that the hierarchical solution provides a mixed fit to the data: SBχ²(25.84)  = 62.50, p = .0001; comparative fit index = .94, non-normed fit index = .92, root mean square error of approximation = .19 (90% confidence interval = .17-.21), standardized root mean squared residual = .08. The BPAQ-SF demonstrated good internal consistency (α = .84) and test-retest reliability (r = .86), correlations in the expected direction with predictors of and buffers against aggression, and sensitivity to change among LEOs who participated in an intervention targeting aggression. Results support and extend previous findings suggesting that the BPAQ-SF is a valid and reliable measure of aggression among LEOs.

Relative Impact of Mindfulness, Self-Compassion, and Psychological Resilience on Mental Health Outcomes in Racially Minoritized Adults

Racially minoritized adults lack equal representation in research and experience disparities in healthcare. Little is known about which trait-level factors may help mitigate negative and promote positive psychological health among adults from these communities. The aim of this study was to assess the differential impact of dispositional mindfulness, self-compassion, and resilience in predicting depression, anxiety, stress, and life satisfaction in a sample of racially minoritized adults. This study is a cross-sectional analysis of 169 participants (37.3% female and 62.7% male) between the ages of 18 and 64 (M = 37.05; SD = 11.94). Separate hierarchical multiple regression models examined the relative influence of mindfulness facets (acting with awareness (AA); nonjudging of inner experience (NJ), and nonreactivity of inner experience (NR)), self-compassion, and resilience in predicting depression, anxiety, stress, and life satisfaction. Self-compassion, resilience, AA, and NR predicted depression; self-compassion, resilience, and NR predicted anxiety; self-compassion, resilience, and NR predicted stress; and self-compassion predicted satisfaction with life. Self-compassion, resilience, AA, NJ, and NR differentially predicted depression, anxiety, stress, and life satisfaction; however, only self-compassion consistently predicted all outcomes. Future research may incorporate an intersectional methodology and account for differences among different racially minoritized groups.

The impact of ethnic discrimination on chronic pain: the role of sex and depression

ABSTRACTPerceived ethnic discrimination (PED) is predictive of chronic pain-related outcomes. Less is known about pathways through which these constructs interact. The goal of this study was to test whether PED was predictive of chronic pain-related outcomes (pain interference, pain intensity, and symptoms related to central sensitization), whether depression mediated the relationship between PED and pain outcomes, and if these relationships were maintained across sex in a sample of racially and ethnically minoritized adults (n = 77). PED significantly predicted pain interference, pain intensity, and symptoms related to central sensitization. Sex accounted for a significant proportion of the variance in pain interference only. Depression explained the relationship between PED and pain interference and pain intensity. Sex moderated the indirect pathway, such that for men, the relationship between PED and pain interference and pain intensity was explained via depression. Depression partially explained the relationship between PED and symptoms related to central sensitization. Sex did not moderate this mediational effect. This study provided a unique contribution to the pain literature by providing a contextual analysis of PED and pain. Addressing and validating experiences of lifetime discrimination may be a clinically relevant tool in the management of chronic pain for of racially and ethnically minoritized adults.

Acceptance and Commitment Therapy Processes Differentially Predict Aspects of Mental Health

Psychological flexibility relates to various aspects of mental health, including psychological distress and adaptive mental health. The CompACT has been developed to assess psychological flexibility by quantifying psychological flexibility as a multidimensional whole, and by three processes of psychological flexibility including, Openness to Experience (OE), Behavioral Awareness (BA), and Valued Action (VA). The current study examined the unique predictive property of each three process of the CompACT with aspects of mental health. Participants (N = 593) were a diverse sample of United States adults. Our results found OE and BA significantly predicted depression, anxiety, and stress. OE and VA significantly predicted satisfaction with life, and all three processes significantly predicted resilience. Our results support multidimensional assessment of psychological flexibility when examining aspects of mental health.

A Confirmatory Factor Analysis of the PROMIS Sleep Disturbance Among Law Enforcement Officers

Law enforcement officers (LEOs) are at increased risk for sleep disorders relative to the general population. Common LEO occupational stressors, including critical incidents and shift work, predict sleep disturbance, which in turn negatively impacts health, performance, and community safety. The Patient-Reported Outcomes Measurement Information System-Sleep Disturbance 4-item (PROMIS SD4) was developed to assess self-reported sleep quality, satisfaction, and difficulties falling asleep. Previous studies suggest PROMIS-SD short-forms (4-, 6-, and 8-item) have good psychometric properties; however, evaluation of this easily-administered measure in high-stress, frontline populations is limited. The primary goal of this study was to evaluate the validity and reliability of the PROMIS-SD4 in a sample of LEOs (N = 111). A confirmatory factor analysis suggests that the original one-factor solution, with a correlated error-term, provides an excellent fit to the data, SBχ²(2) = 1.62, p = .23, CFI = .99, RMSEA = .12, SRMR = .01. The PROMIS SD4 demonstrated good reliability (α = .85) and evidence of convergent validity correlations in the expected direction with domains of psychological distress, positive health outcomes, reactivity, and body experience (all p's < .05). Results suggest that the PROMIS-SD4 is a valid and reliable measure of sleep disturbance among LEOs.

The Relationships Between Reduced Alcohol Use and Decreased Burnout Following Mindfulness-Based Resilience Training in Law Enforcement Officers

Objective: This study is a secondary analysis of data collected in an earlier clinical trial of mindfulness-based resilience training (MBRT) (ClinicalTrials.gov registration number 02521454), where the MBRT condition demonstrated a significant reduction in self-reported burnout and trend-level reductions in alcohol use in law enforcement officers (LEOs). Given that MBRT is not designed to be a substance use intervention and does not contain explicit substance-related content, this study sought to clarify these findings by exploring whether improved burnout mediates reduced alcohol use. Method: Participants (n = 61) were sworn LEOs (89% male, 85% White, 8% Hispanic/Latinx) recruited from departments in a large urban metro area of the northwestern United States, and were randomized to either MBRT (n = 31) or no intervention control group (n = 30) during the trial. Results: MBRT group assignment predicted reduced burnout (b = 0.43, standard error [SE] = 0.14, p = 0.004), which subsequently predicted reduced alcohol use (b = 1.69, SE = 0.81, p = 0.045). Results suggest that reduced alcohol use was indirectly related to a reduction in burnout post-MBRT. Conclusion: Given that MBRT does not explicitly address substance use, these findings were interpreted to suggest that officers in the training acquired a new set of coping skills to deal with the operational and organizational stressors of police work.

Translation, Cross-Cultural Adaptation, and Psychometric Validation of the English Version of the Postural Awareness Scale

PURPOSE

The Postural Awareness Scale (PAS) was developed among a sample of German speakers to measure self-reported awareness of body posture. The first aim of this study was to conduct an English translation and cross-cultural adaptation of the PAS. The second aim was to assess psychometric properties of the English version of the PAS.

METHODS

Forward and backward translations were conducted. The translated scale was then pretested in a small sample of English-speaking adults (n = 30), followed by cognitive interviews. Finally, consensus of the translated scale was achieved among an expert committee (n = 5), resulting in the Postural Awareness Scale-English Version (PAS-E). Psychometric properties of the PAS-E were investigated among a sample of individuals with chronic pain (n = 301) by evaluating factor structure, reliability, and construct validity. Analyses of variance were conducted to calculate differences in PAS-E scores between specific subgroups (pain conditions, sex, and history of mindfulness practice). Linear regression analyses investigated whether the scores on the PAS-E predicted levels of pain, stress, and mood.

RESULTS

The results obtained from an exploratory factor analysis showed a two-factor solution and were supported by a confirmatory factor analysis. The scale demonstrated good internal consistency and satisfactory construct validity. No significant differences related to sex at birth or pain duration were found.

CONCLUSION

PAS-E demonstrated good psychometric properties, and therefore, can and should be used both for research and clinical practice.

Reexamining the Role of Diet in Dermatology

Dermatologists often are asked by patients to provide dietary recommendations. It was previously thought that many skin conditions were unaffected by diet; however, increasing associations between specific nutritional practices and dermatologic conditions are being recognized. The role of diet in acne has been well studied, but rigorous studies on dietary interventions for other common skin conditions are lacking. Understanding the current nutritional strategies employed by patients as well as the existing literature behind these practices is crucial for dermatologists to provide recommendations for patients regarding diet and skin disease.

Mindful Nonreactivity Moderates the Relationship between Chronic Stress and Pain Interference in Law Enforcement Officers

INTRODUCTION

With high levels of both chronic stress and chronic pain, law enforcement provides a unique population in which to study the potential mitigating impact of cognitive and affective reactivity on the stress-pain link. The primary aim of the present study was to examine the moderating role of mindful nonreactivity in the relationship between chronic stress and pain interference in law enforcement officers (n = 60).

METHODS

A regression analysis was conducted to determine if chronic stress predicted pain interference, and subsequently, to compute an estimate of the interaction effect of the chronic stress and mindful nonreactivity on pain interference.

RESULTS

Results demonstrated the overall model was significant, F (3,55) = 5.29, p =.003, R2 = .47. When controlling for mindful nonreactivity, chronic stress significantly predicted pain interference, b = .76, t (55) = 3.40, p = .001, such that every one unit increase in chronic stress was associated with a .76 unit increase in pain interference. Results also demonstrated a significant interaction effect of mindful nonreactivity and chronic stress on pain interference, b = -.04, t (55) = -2.86, p = .006. The Johnson-Neyman technique was conducted and revealed among individuals with low levels of mindful nonreactivity, chronic stress significantly predicted pain interference. However, for individuals with greater levels of mindful nonreactivity, chronic stress no longer predicted pain interference.

CONCLUSIONS

Findings contribute to a growing understanding of how mindfulness can mitigate harmful effects of stress.

Relative Impact of Mindfulness, Self-Compassion, and Psychological Flexibility on Alcohol Use and Burnout Among Law Enforcement Officers

Objectives: In the present study, we investigated the relative impact of improvements in mindfulness, self-compassion, and psychological flexibility in predicting decreased burnout and alcohol use in a sample of law enforcement officers (LEOs) participating in a mindfulness-based intervention (MBI). Design: This study is a secondary analysis of pre/post data collected as part of a larger randomized controlled trial of mindfulness-based resilience training (MBRT). Subjects: This secondary analysis comprises pre/post data from 28 LEOs recruited from a metropolitan area and its outlying regions in the Pacific Northwest. Intervention: MBRT is a MBI tailored specifically to the culture and needs of LEOs and other first responders. Outcome measures: All included data were obtained through self-report measures. Mindfulness was assessed by the Five Facet Mindfulness Questionnaire-Short Form, self-compassion was assessed by the Self-Compassion Scale-Short Form, psychological flexibility was assessed by the Acceptance and Action Questionnaire-II, alcohol use was measured by the PROMIS® (v1.0) Alcohol Use-Short Form, and burnout was assessed by the Oldenburg Burnout Inventory. Results: In the first regression, only increases in mindfulness significantly predicted decreased postintervention problematic alcohol use. In the second regression, only increases in self-compassion significantly predicted decreased postintervention burnout. Conclusions: This study builds upon a growing body of literature on the relative impact of mindfulness, self-compassion, and psychological flexibility in predicting outcomes among high-stress cohorts. Results suggest that different components of MBIs may be emphasized to achieve unique benefits. The Clinical Trial Registration number for the parent study is NCT02521454.

Mindfulness-based resilience training for aggression, stress and health in law enforcement officers: study protocol for a multisite, randomized, single-blind clinical feasibility trial

BACKGROUND

Law enforcement officers (LEOs) are exposed to significant stressors, elevating their risk for aggression and excessive use of force, as well as mental health consequences, including post-traumatic stress disorder, burnout, alcohol misuse, depression, and suicide. Mindfulness training is a promising approach with high-stress populations that has been shown effective for increasing resilience and improving negative mental health outcomes common among LEOs.

METHOD

Implemented at two sites, the proposed study is designed to establish optimal protocols and procedures for a future full-scale, multisite trial assessing effects of mindfulness-based resilience training versus an attention control (stress management education) and a no-intervention control on physiological, behavioral, and psychological outcomes. To prepare for this future clinical trial, the current study is designed to: enhance efficiency of recruitment, engagement, and retention; optimize laboratory, assessment, and data management procedures; optimize intervention training and ensure fidelity to intervention protocols; and assess participant experience and optimize outcome measures across two sites. Herein, we describe the protocol and methodology of this multisite, randomized, single-blind clinical feasibility trial.

DISCUSSION

The long-term objective of this line of research is to develop an intervention that will reduce violence and increase resilience and mental health among LEOs, as well as yield significant benefits for the communities and residents they serve.

TRIAL REGISTRATION

ClinicalTrials.gov, NCT03784846. Registered on 24 December 2018.

Combined Therapy Potential of Apocynin and Tert-butylhydroquinone as a Therapeutic Agent to Prevent Secondary Progression to Traumatic Brain Injury

Traumatic brain injury is caused by physical collision (primary injury). It changes the brain's biochemistry and disturbs the normal brain function such as memory loss and consciousness disturbance (secondary injury). The severity can be measured with the Glasgow Coma Scale. The secondary injury will cause oxidative stress that leads to the nervous cells death, so treatment is needed before it gets worse. Primary injury results in excess of reactive oxidative stress (ROS) which is known from NADPH oxidase 2 (Nox2). Excessive ROS is deadly to the nerve cells. Excessive ROS will activate nuclear factor erythroid 2-like 2 (Nrf2). Nrf2 will bind to antioxidant response elements, to protect multi organs against ROS, including this brain injury. However, this does not last long, so it requires handling excess ROS. Apocynin can inhibit the activation of Nox2, and reduce the neuron injuries in the hippocampus. It also protects the tissues from oxidative stress. While Nrf2 can be activated by tert-butylhydroquinone, to protect cells. The combination may reduce the secondary brain injury, improve the neurologic recovery, cognitive function, and reduce the secondary cortical lesion.

Mindfulness Training, Implicit Bias, and Force Response Decision-making

OBJECTIVE

The goal of this study was to assess the preliminary efficacy of a Mindfulness-Based Training (Mindfulness-based Resilience Training; MBRT) in improving weapon identification among Law Enforcement Officers (LEOs).

METHODS

Participants (N = 61) were randomly assigned to either MBRT or a no-intervention control group (NIC). A self-report questionnaire assessing mindfulness and a computerized measure assessing implicit stereotype reliance were administered at baseline, post-training, and three months following intervention completion. We also collected information about meditation practice outside of the training for LEOs in the MBRT group.

RESULTS

Inferential analyses yielded improvements in mindfulness in the MBRT group compared to NIC. Analyses did not provide evidence for implicit stereotype reliance at baseline and therefore did not yield a significant impact of MBRT versus NIC on implicit stereotype reliance, ps > .05; however, participants across both conditions exerted more control when responding to Black male targets compared to White male targets, F(1,74) = 3.98, p = .05, 95% CI [-.05, -.01], d = .36.

CONCLUSIONS

Our results do not provide evidence for the impact of MBRT on weapon identification, but do suggest that LEOs exerted more effort when responding to images of Black males compared to White males. We discuss recommendations for future clinical trials assessing implicit stereotype reliance, viz., that researchers utilize measures more sensitive to a wider range of LEO samples and with higher ecological validity, and we discuss potential reasons why our results do not align with past research.

Mindfulness-based Wellness and Resilience intervention among interdisciplinary primary care teams: a mixed-methods feasibility and acceptability trial

AIMS

The primary objective of this study was to evaluate feasibility and acceptability of Mindfulness-based Wellness and Resilience (MBWR): a brief mindfulness-based intervention designed to enhance resilience and is delivered to interdisciplinary primary care teams.

BACKGROUND

Burnout is a pervasive, international problem affecting the healthcare workforce, characterized by emotional exhaustion, depersonalization, and decreased professional effectiveness. Delivery models of mindfulness-based resilience interventions that enhance feasibility for onsite delivery, consider cultural considerations specific to primary care, and utilize team processes that are integral to primary care are now needed.

METHODS

We conducted a mixed-methods feasibility and acceptability trial of MBWR. Primary feasibility and acceptability outcomes were assessed by number of participants recruited, percent of MBWR treatment completer, and attrition rate during the 8-week intervention, and four items on a Likert-type scale. Secondary outcomes of perceived effects were measured by focus groups, an online survey, and self-reported questionnaires, including the Brief Resilience Scale, the Five Facet Mindfulness Questionnaire-Short Form, and the Self-Compassion Scale-Short Form. Participants included 31 healthcare providers on interdisciplinary primary care teams employed a safety-net medical center. In the MBWR group, 68% identified as Latinx, compared to 64% in the control group.

FINDINGS

All criteria for feasibility were met and participants endorsed high levels of satisfaction and acceptability. The results of this study suggest that MBWR provides multiple perceived benefits to the individual healthcare provider, cohesion of the healthcare team, and enhanced patient care. MBWR may be a feasible and acceptable method to integrate mindfulness, resilience, and teamwork training into the primary care setting.

Acceptance and Commitment Therapy for the Treatment of Chronic Pain and Coexisting Depression: A Single-Case Study

Pain resulting from chronic medical conditions (CMCs) can create debilitating effects globally across domains of functioning in the lives of those it impacts. There currently remain no treatment options to eliminate associated pain entirely, leaving care efforts often to manage the disabling effects and consequential depression. Acceptance and commitment therapy (ACT) has recently been introduced as an alternative treatment approach, emphasizing the commitment to engage in actions that contribute to a fulfilling life even in the face of disability through the fostering of psychological flexibility. For patients who do not respond to traditional psychological approaches, ACT may offer a sensible substitute. This single-case study delineates ACT for chronic pain and comorbid depression using standardized and patient-centered outcome measures across areas of general symptom functioning, therapeutic processes, and flexibility surrounding pain associated with CMCs. Clinical significance and reliable change were calculated using the reliable change index, in conjunction with patient-reported behavioral engagement and subjective assessment. Results indicate significant improvement across areas of depression, psychological flexibility, and flexibility in relating to pain endured from CMCs. The patient reported perceived improvement in quality of life and no longer viewed herself as a “professional patient.” This case study illustrates the potential of shifting from restraining and extinguishing symptoms to fostering a stance of willingness to reengage in a valued life while continuing to live with CMCs.

Extranodal lymphoma of the tongue, a very rare entity-report of two cases with literature review

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The extranodal lymphoma of the base of the tongue is extremely rare.

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Among the lymphoma of the tongue; B cell lymphoma is more common than T cell lymphoma.

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It should be included in the differentials in patients with tumors arising from this site.

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Early detection and treatment can often result in a complete cure and a better long-term survival.

Background

Lymphomas are malignant neoplasms of the lymphocyte cell lines affecting the lymph nodes, spleen and other nonhemopoietic tissues. Of the extranodal lymphomas found in the head and neck region, 3–5% of malignant lymphomas arise in the oral and paraoral region, mainly from Waldeyer's ring. The involvement of the base of the tongue is extremely rare.

Summarised Case

Case 1: 64 year old female who presented initially with an enlarged occipital lymph node which gradually became generalized cervical lymphadenopathy with initial histology confirmed reactive lymphoid hyperplasia. Biopsy of left postero-lateral tongue lesion eventually showed high grade T cell lymphoma.

Case 2: 85 year old male presented with history of dysphagia for one year who was found to have a lesion extending from his base of tongue into the nasopharynx. Histology showed a diffuse B cell lymphoma.

Discussion

Both patients were noted to have lesion of the tongue, but tongue lesions are noted in the literature to be extremely rare. When tongue lymphomas do occur, most are of B-cell origin; the diffuse large-cell variety is the most common. Extranodal lymphomas of the T cell phenotype tend more to be sinonasal in origin than of the tongue, with T cell lymphomas of the tongue being even rarer than B cell lymphomas.

Conclusion

With regards to tumours arising in the tongue, squamous cell carcinomas are still classified as the most common. Lymphomas however, should still be kept in consideration as a differential diagnosis with regards to lesions arising from this site.

DISPOSITIONAL MINDFULNESS MODERATES THE RELATIONSHIP BETWEEN OCCUPATIONAL STRESSORS AND PERCEIVED STRESS AMONG LAW ENFORCEMENT PERSONNEL

Law enforcement personnel (LEPs) experience occupational stressors that can result in poor health outcomes and have a negative impact on the communities they serve. Dispositional mindfulness, or receptive awareness and attention to present moment experience, has been shown to negatively predict perceived stress and to moderate the relationship between stressors and negative stress-related outcomes. The current study is an investigation of the moderating role of specific facets of dispositional mindfulness (i.e., nonreactivity, nonjudging, and acting with awareness) in the relationship between occupational stressors and perceived stress in a sample of LEPs. As hypothesized, nonreactivity significantly moderated the relationship between operational stressors and perceived stress, such that LEPs low in nonreactivity exhibited a significant relationship between stressors and perceived stress, whereas those high in nonreactivity did not. Nonjudging also moderated the relationship between organizational stressors and perceived stress; however, unexpectedly, LEPs high in nonjudging evidenced a significant relationship between stressors and perceived stress, whereas those low in nonjudging did not. Potential implications of these findings for LEP stress reduction interventions are discussed.

Study protocol of a multicenter randomized controlled trial of mindfulness training to reduce burnout and promote quality of life in police officers: the POLICE study

BACKGROUND

Police officers experience a high degree of chronic stress. Policing ranks among the highest professions in terms of disease and accident rates. Mental health is particularly impacted, evidenced by elevated rates of burnout, anxiety and depression, and poorer quality of life than the general public. Mindfulness training has been shown to reduce stress, anxiety, burnout and promote quality of life in a variety of settings, although its efficacy in this context has yet to be systematically evaluated. Therefore, this trial will investigate the efficacy of a mindfulness-based intervention versus a waitlist control in improving quality of life and reducing negative mental health symptoms in police officers.

METHODS

This multicenter randomized controlled trial has three assessment points: baseline, post-intervention, and six-month follow-up. Active police officers (n = 160) will be randomized to Mindfulness-Based Health Promotion (MBHP) or waitlist control group at two Brazilian major cities: Porto Alegre and São Paulo. The primary outcomes are burnout symptoms and quality of life. Consistent with the MBHP conceptual model, assessed secondary outcomes include perceived stress, anxiety and depression symptoms, and the potential mechanisms of resilience, mindfulness, decentering, self-compassion, spirituality, and religiosity.

DISCUSSION

Findings from this study will inform and guide future research, practice, and policy regarding police offer health and quality of life in Brazil and globally.

TRIAL REGISTRATION

ClinicalTrials.gov NCT03114605 . Retrospectively registered on March 21, 2017.

ROLE OF RESILIENCE IN MINDFULNESS TRAINING FOR FIRST RESPONDERS

First responders are exposed to critical incidents and chronic stressors that contribute to a higher prevalence of negative health outcomes compared to other occupations. Psychological resilience, a learnable process of positive adaptation to stress, has been identified as a protective factor against the negative impact of burnout. Mindfulness-Based Resilience Training (MBRT) is a preventive intervention tailored for first responders to reduce negative health outcomes, such as burnout. This study is a secondary analysis of law enforcement and firefighters samples to examine the mechanistic role of psychological resilience on burnout. Results indicated that changes in resilience partially mediated the relationship between mindfulness and burnout, and that increased mindfulness was related to increased resilience (b = .41, SE = .11, p < .01), which in turn was related to decreased burnout (b = -.25, SE = .12, p = .03). The bootstrapped confidence interval of the indirect effect did not contain zero [95% CI; -.27, -.01], providing evidence for mediation. Limitations and implications are discussed.

A Qualitative Study of Mindfulness Among Veterans With Posttraumatic Stress Disorder: Practices Differentially Affect Symptoms, Aspects of Well-Being, and Potential Mechanisms of Action

This qualitative study explored and compared the subjective experiences of 102 veterans with posttraumatic stress disorder (PTSD) who were randomly assigned to 1 of 4 arms: ( a) body scan, ( b) mindful breathing, ( c) slow breathing, or ( d) sitting quietly. Qualitative data were obtained via semistructured interviews following the intervention and analyzed using conventional content analysis. The percentage of participants within each intervention who endorsed a specific theme was calculated. Two-proportion z tests were then calculated to determine if the differences among themes endorsed in specific groups were statistically significant. Six core themes emerged from analysis of participant responses across the 4 groups: ( a) enhanced present moment awareness, ( b) increased nonreactivity, ( c) increased nonjudgmental acceptance, ( d) decreased physiological arousal and stress reactivity, ( e) increased active coping skills, and ( f) greater relaxation. More participants in the mindfulness intervention groups reported improvement in PTSD symptoms when compared to participants in non-mindfulness groups. Different types of intervention targeted different symptoms and aspects of well-being. Furthermore, type of intervention may have also differentially targeted potential mechanisms of action. This article highlights the importance of employing both quantitative and qualitative research methods when investigating the dynamic process of mindfulness and may inform how practices can be tailored to the needs of the veteran with PTSD.

The Body Scan and Mindful Breathing Among Veterans with PTSD: Type of Intervention Moderates the Relationship Between Changes in Mindfulness and Post-treatment Depression

Mindfulness-based stress reduction (MBSR) is a promising intervention for veterans with post-traumatic stress disorder (PTSD) and depression; however, a more detailed examination of the different elements of MBSR and various facets of mindfulness to determine what works best for whom is warranted. One hundred and two veterans with PTSD were randomly assigned to one of four arms: (a) body scan (BS; n= 27), (b) mindful breathing (MB; n=25), (c) slow breathing (SB; n=25), or (d) sitting quietly (SQ; n=25). The purpose of this study was to (a) examine two separate components of MBSR (i.e., body scan and mindful breathing) among veterans with PTSD when compared to a nonmindfulness intervention (SB) and a control group (SQ), (b) assess if changes in specific mindfulness facets were predictive of post-treatment PTSD and depression for individuals who participated in a mindfulness intervention (BS vs. MB), and (c) investigate if type of mindfulness intervention received would moderate the relationship between pre- to post-treatment changes in mindfulness facets and post-treatment outcomes in PTSD and depression. Participants in the mindfulness groups experienced significant decreases in PTSD and depression symptom severity and increases in mindfulness, whereas the nonmindfulness groups did not. Among veterans who participated in a mindfulness group, change in the five facets of mindfulness accounted for 23 % of unique variance in the prediction of post-treatment depression scores. Simple slope analyses revealed that type of mindfulness intervention moderated the relationship among changes in facets of mindfulness and post-treatment depression.

A validated cadaveric model of trochlear dysplasia

PURPOSE

Despite the high prevalence of trochlear dysplasia among patients with patellar instability, it is not well studied and is infrequently addressed surgically. The lack of a validated cadaveric model of trochlear dysplasia may be a contributing factor. The goal of this study was to develop a simple, reproducible, and realistic cadaveric model of trochlear dysplasia by surgically modifying cadaveric femora with normal anatomy and then to validate this model through the use of mechanical and fluoroscopic measurements.

METHODS

The floor of the trochlear groove was surgically elevated using an inflatable bone tamp in eight cadaveric femora. The trochlear depth (TD) was measured with a custom-designed measuring device, and radiographic markers of dysplasia (sulcus angle, crossing sign, and prominence) were assessed before and after surgical modification.

RESULTS

The average TD was 3.6±1.4, 4.6±1.1, and 5.1±1.0 mm prior to reverse trochleoplasty (RT) and 1.0±1.8, 2.3±1.3, and 3.3±2.5 mm following RT at 0°, 20°, and 40° of flexion, respectively. These direct measurements of TD were confirmed with fluoroscopy. The sulcus angle averaged 141° prior to RT and 157° after RT. The average prominence across all specimens was 3.3±0.7 mm before RT, and 5.5±1.5 mm after RT. Finally, the crossing sign was found to be absent in all knees prior to RT and present in 7 of the 8 after RT.

CONCLUSIONS

The results of this study show that elevation of the trochlear floor with an inflatable bone tamp can reproducibly create a simulated dysplastic trochlea. This model may be useful in biomechanical studies of treatments for patellofemoral instability.

Is abdominal aortic calcification score a cost-effective screening tool to predict atherosclerotic carotid plaque and cardiac valvular calcification in patients with end-stage renal disease?

Abdominal aortic calcification (AAC), cardiac valvular calcification (CVC), and atherosclerotic carotid plaque (CP) are known cardiovascular risk factors. The accuracy of the AAC score in predicting CP and CVC in patients with end-stage renal disease (ESRD) is assessed in this study. Twenty-two consecutive prevalent dialysis patients (group 1) and 26 consecutive nondialysis stage V chronic kidney disease patients (group 2) were assessed for their demographic and laboratory variables. Lateral radiograph of the lumbosacral spine was used to assess the AAC score. CP and CVC were assessed using carotid sonography and echocardiogram, respectively. Prevalence of AAC, CP, and CVC in groups 1 and 2 was, respectively, 72.7%, 81.8%, and 72.7% and 76.9%, 80.8%, and 57.7%. AAC was strongly associated with CP and CVC in both groups (P < 0.001). Tests of accuracy for the AAC score as a predictor of CP and CVC showed sensitivity, specificity, positive predictive value, negative predictive value, likelihood ratio of a positive test, and likelihood ratio of a negative test, respectively, in group 1: 83%, 75%, 93%, 50%, 3.32, and 0.23 and 85%, 77%, 87%, 70%, 4.5, and 0.29, and in group 2: 90%, 95%, 83%, 69%, 3.9, 0.41, and 82%, 91%, 77%, 71%, 4.1, and 0.21. Reproducibility of the AAC score among observers was acceptable. The AAC score can predict CP and CVC with moderate accuracy in ESRD patients. However, as our study was underpowered, the findings need validation in larger, adequately powered studies.

Use of Toll-Like Receptor 3 Agonists Against Respiratory Viral Infections

Respiratory RNA viruses are constantly evolving, thus requiring development of additional prophylactic and therapeutic strategies. Harnessing the innate immune system to non-specifically respond to viral infection has the advantage of being able to circumvent viral mutations that render the virus resistant to a particular therapeutic agent. Viruses are recognized by various cellular receptors, including Toll-like receptor (TLR) 3 which recognizes double-stranded (ds)RNA produced during the viral replication cycle. TLR3 agonists include synthetic dsRNA such as poly (IC), poly (ICLC) and poly (AU). These agents have been evaluated and found to be effective against a number of viral agents. One major limitation has been the toxicity associated with administration of these drugs. Significant time and effort have been spent to develop alternatives/modifications that will minimize these adverse effects. This review will focus on the TLR3 agonist, poly (IC)/(ICLC) with respect to its use in treatment/prevention of respiratory viral infections.

Contrasting effects of exercise, AICAR, and increased fatty acid supply on in vivo and skeletal muscle glucose metabolism

The increased energy required for acute moderate exercise by skeletal muscle (SkM) is derived equally from enhanced fatty acid (FA) oxidation and glucose oxidation. Availability of FA also influences contracting SkM metabolic responses. Whole body glucose turnover and SkM glucose metabolic responses were determined in paired dog studies during 1) a 30-min moderate exercise (maximal oxygen consumption of approximately 60%) test vs. a 60-min low-dose 5-aminoimidazole-4-carboxamide-1-beta-d-ribofuranoside (AICAR) infusion, 2) a 150-min AICAR infusion vs. modest elevation of FA induced by a 150-min combined intralipid-heparin (IL/hep) infusion, and 3) an acute exercise test performed with vs. without IL/hep. The exercise responses differed from those observed with AICAR: plasma FA and glycerol rose sharply with exercise, whereas FA fell and glycerol was unchanged with AICAR; glucose turnover and glycolytic flux doubled with exercise but rose only by 50% with AICAR; SkM glucose-6-phosphate rose and glycogen content decreased with exercise, whereas no changes occurred with AICAR. The metabolic responses to AICAR vs. IL/hep differed: glycolytic flux was stimulated by AICAR but suppressed by IL/hep, and no changes in glucose turnover occurred with IL/hep. Glucose turnover responses to exercise were similar in the IL/hep and non-IL/hep, but SkM lactate and glycogen concentrations rose with IL/hep vs. that shown with exercise alone. In conclusion, the metabolic responses to acute exercise are not mimicked by a single dose of AICAR or altered by short-term enhancement of fatty acid supply.

Short-term cognitive behavioral partial hospital treatment: a pilot study

OBJECTIVE

Brief, cost-contained, and effective psychiatric treatments benefit patients and public health. This naturalistic pilot study examined the effectiveness of a 2-week, cognitive-behavioral therapy (CBT) oriented partial hospital program.

METHODS

Study participants were 57 patients with mood, anxiety, and/or personality disorders receiving treatment in a private psychiatric partial hospital (PH) setting. A flexible treatment model was used that adapts evidence-based CBT treatment interventions to the PH context with emphases on psychoeducation and skills training. Participants completed self-report measures at admission and after 1 and 2 weeks, to assess stabilization and functional improvements, with added attention to the acquisition of cognitive and behavioral skills. The data were analyzed using repeated measures analyses of variance and correlation.

RESULTS

Participants reported a decrease in symptoms and negative thought patterns, improved satisfaction with life, and acquisition and use of cognitive and behavioral skills. Skill acquisition was correlated with symptom reduction, reduced negative thought patterns, and improved satisfaction with life.

CONCLUSIONS

Results of this pilot study suggest that a 2-week PH program can be effective for a heterogeneous patient population with mood, anxiety, and/or personality disorders. These findings are promising given the prevalence of treatments of such brief duration in private sector PH programs subject to the managed care marketplace. Future studies are planned to test this flexible PH treatment model, with particular attention to the effectiveness of the CBT approach for the treatment of different disorders and to whether effectiveness is sustained at follow-up. Further study should also examine whether skill acquisition is a mechanism of change for symptom reduction and functional improvements.

Impact of in vivo fatty acid oxidation blockade on glucose turnover and muscle glucose metabolism during low-dose AICAR infusion

AMPK plays a central role in influencing fuel usage and selection. The aim of this study was to analyze the impact of low-dose AMP analog 5-aminoimidazole-4-carboxamide-1-beta-d-ribosyl monophosphate (ZMP) on whole body glucose turnover and skeletal muscle (SkM) glucose metabolism. Dogs were restudied after prior 48-h fatty acid oxidation (FA(OX)) blockade by methylpalmoxirate (MP; 5 x 12 hourly 10 mg/kg doses). During the basal equilibrium period (0-150 min), fasting dogs (n = 8) were infused with [3-(3)H]glucose followed by either 2-h saline or AICAR (1.5-2.0 mg x kg(-1) x min(-1)) infusions. SkM was biopsied at completion of each study. On a separate day, the same protocol was undertaken after 48-h in vivo FA(OX) blockade. The AICAR and AICAR + MP studies were repeated in three chronic alloxan-diabetic dogs. AICAR produced a transient fall in plasma glucose and increase in insulin and a small decline in free fatty acid (FFA). Parallel increases in hepatic glucose production (HGP), glucose disappearance (R(d tissue)), and glycolytic flux (GF) occurred, whereas metabolic clearance rate of glucose (MCR(g)) did not change significantly. Intracellular SkM glucose, glucose 6-phosphate, and glycogen were unchanged. Acetyl-CoA carboxylase (ACC approximately pSer(221)) increased by 50%. In the AICAR + MP studies, the metabolic responses were modified: the glucose was lower over 120 min, only minor changes occurred with insulin and FFA, and HGP and R(d tissue) responses were markedly attenuated, but MCR(g) and GF increased significantly. SkM substrates were unchanged, but ACC approximately pSer(221) rose by 80%. Thus low-dose AICAR leads to increases in HGP and SkM glucose uptake, which are modified by prior FA(ox) blockade.

Effects of different aspirin formulations on platelet aggregation times and on plasma salicylate concentrations

BACKGROUND

Early aspirin treatment is widely used to inhibit platelet activity and to reduce morbidity and mortality in patients presenting with an acute myocardial infarction or a stroke. A number of different aspirin formulations have been used for this purpose; however, a comparison of their effectiveness in inhibiting early platelet aggregation has not been determined.

METHODS

In this study, we determined plasma salicylate concentrations and platelet inhibitory activities at various times after ingestion of three commonly used aspirin formulations: soluble aspirin (Alka-Seltzer), 325 mg, chewed baby aspirin, 324 mg, and whole compressed non-enteric coated aspirin, 324 mg. Twenty-four healthy volunteers, 18-39 years of age, participated in the prospective single-blinded triple-crossover study. Plasma salicylate concentrations and inhibition of arachidonic acid-induced platelet aggregation were determined on post-dose blood samples collected at 2.5, 5.0, 7.5, 10, 15, 20, 25, 30, and 40 min. All subjects crossed over to the other two formulations with at least 2 weeks between ingestions.

RESULTS

The median platelet inhibition times for the chewed, soluble, and whole aspirin formulations were 7.5, 7.5, and 10.0 min, respectively. Soluble and chewed aspirin were found to inhibit platelet aggregation faster than whole aspirin (p<0.001); however, there were no significant differences in platelet aggregation times between the soluble and chewed formulations (p<0.163). Inhibition of platelet aggregation was found to occur at an average plasma salicylate concentration of 2.46 microg/mL, regardless of method of ingestion.

CONCLUSION

The results indicate that soluble and chewed aspirin inhibit platelet aggregation in a shorter period of time than does whole aspirin. The results suggest that chewing baby aspirin or taking soluble buffered aspirin may be the preferred route of administration for early platelet inhibition.

Leptospirosis--an overview

One of the important causes of acute febrile illness in a country where malaria, typhoid and dengue are also not uncommon, leptospirosis, a zoonotic disease spread by rodents, is endemic in Tamil Nadu, Kerala and Andamans; and is now being increasingly reported from other parts of India, perhaps with better facility to diagnose the disease. Disease of profound importance in view of its grave outcome, in its icteric form (Weil's disease), may have a mortality of as high as 40%. Worst prognosticator is the presence of multi-organ failure (MOF), as in any other septicemia. Andaman hemorrhagic fever (AHF), a type peculiar to Andamans, is now being described elsewhere in the country also. IgM ELISA, Dot-ELISA, dip-stick method and slide agglutination test (SAT) are newer screening methods for diagnosis of leptospirosis, but are only genus-specific. Identifying specific serovar is possible by Micro-agglutination test (MAT) and culture method only. Anicteric type of disease, however, is easily treatable with penicillin and has a good prognosis. Oral doxycycline can be used for prophylaxis during the risk of exposure.

An evolutionary approach to the architecture of effective healthcare delivery systems

PURPOSE

Aims to show that material flow concepts developed and successfully applied to commercial products and services can form equally well the architectural infrastructure of effective healthcare delivery systems.

DESIGN/METHODOLOGY/APPROACH

The methodology is based on the "power of analogy" which demonstrates that healthcare pipelines may be classified via the Time-Space Matrix.

FINDINGS

A small number (circa 4) of substantially different healthcare delivery pipelines will cover the vast majority of patient needs and simultaneously create adequate added value from their perspective.

RESEARCH LIMITATIONS/IMPLICATIONS

The emphasis is firmly placed on total process mapping and analysis via established identification techniques. Healthcare delivery pipelines must be properly engineered and matched to life cycle phase if the service is to be effective.

PRACTICAL IMPLICATIONS

This small family of healthcare delivery pipelines needs to be designed via adherence to very specific-to-purpose principles. These vary from "lean production" through to "agile delivery".

ORIGINALITY/VALUE

The proposition for a strategic approach to healthcare delivery pipeline design is novel and positions much currently isolated research into a comprehensive organisational framework. It therefore provides a synthesis of the needs of global healthcare.

A broader view of trauma: A biopsychosocial-evolutionary view of the role of the traumatic stress response in the emergence of pathology and/or growth

The main goal of this paper is to articulate a biopsychosocial evolutionary approach to understanding the traumatic stress response. The secondary goal of this paper is to draw out the general clinical implications of this approach. I articulate seven interconnected and overlapping empirically grounded theoretical conclusions: (1) Stress is best understood as a prerational form of biopsychological feedback regarding the organism's relationship with its environment; (2) The normal outcome of traumatic stress is growth, rather than pathology; (3) Most psychopathology is a function of the maladaptive modulation of the stress response; (4) Trauma always leaves the individual transformed on a biological, as well as psychological, level; (5) The general biological process underlying stress responses is universal, but the specific dynamics are always a function of the unique sociocultural environment and psychological makeup of the individual; (6) The biology underlying stable psychopathological symptoms may change even as the psychological symptoms remain the same; and (7) Rationality is humanity's evolutionarily newest and most sophisticated stress-reduction behavioral mechanism, and the most important aspect of restoring psychological health to the trauma victim.

Learning from different cultures--a cultural diversity project in end-of-life care

In January 1997, Midwest Bioethics Center (MBC) launched PATHWAYS to Improve End-of-Life Care, a three-year multifaceted community initiative to improve care of the dying in the Kansas City metropolitan area. Pathways focused on professional education and development, institutional reform, and public engagement, using thirteen different strategies to accomplish dozens of projects. Ultimately, more than 2,000 professionals and other community leaders were involved and more than 600 organizations participated. This article describes a cultural diversity project on end-of-life care that developed from this program.

Methylation and mutational analysis of p27(kip1) in prostate carcinoma

BACKGROUND

We have previously identified 12p12-13 as a region of frequent genetic loss in prostate carcinoma. A candidate tumor suppressor gene at this locus is the cyclin dependent kinase inhibitor p27(kip1), which has been implicated as a marker of aggressive prostate carcinoma. Herein, we examine metastatic prostate tumors, xenografts, and cell lines for gene inactivation via mutational inactivation or promoter hypermethylation.

METHODS

Mutation analysis was performed on metastatic prostate tumors of 18 patients, eight prostate carcinoma cell lines, and 18 xenografts by PCR amplification of the entire open reading frame of p27(kip1). PCR products were sequenced directly using internal primers. Methylation analysis was performed on four cell lines and nine xenografts using direct sequencing of cloned PCR products of bisulfite treated DNA. Presence of a CpG was consistent with methylation of that cytosine in the original sample.

RESULTS

With the exception of the previously reported homozygous deletion, no additional mutations were identified. Methylated CpG residues were identified in three xenografts (LuCAP23, LuCAP35, and PC82) and the methylated residues clustered at six sites; the cytosines 69, 149, 191, 286, 349, and 487 base pairs 5' of the ATG start codon. However, no sample demonstrated promotor methylation in all sequenced clones and the number of methylated base pairs ranged from seven to three, not the level usually associated with gene silencing.

CONCLUSIONS

Mutational inactivation of p27(kip1) is a rare event in metastatic prostate carcinoma. While CpG methylation does occur, it is an infrequent event and does not appear to be the mechanism of p27(kip1) down regulation in prostate carcinoma.

Role of Ethics Committees, Ethics Networks, and Ethics Centers in Improving End-of-Life Care

This article chronicles the work of Midwest Bioethics Center, several community-state partnerships, and other local and national initiatives to determine their proper role and appropriate contribution. Professional education and development, institutional reform, and community engagement are areas of concern because ethics committees, networks, and centers sponsor workshops and conferences on palliative care for healthcare professionals, hold public forums, develop advance care planning projects, and provide expertise to legislators and other policymakers. The leading edge of the work being done by ethics committees, networks, and centers appears to be using continuous quality improvement methods, specifically the development of quality indicators, to promote accountability in end-of-life care reform efforts. This work is something that ethics committees can and should take on.

Insulin secretion in growth hormone-deficient adults: effects of 24 months' therapy and five days' acute withdrawal of recombinant human growth hormone

Beta-cell function in growth hormone (GH)-deficient (GHD) adults is poorly documented. Beta-cell function was therefore studied in 10 GHD adults (age, 40+/-3 years; weight, 79.3+/-4.8 kg; body mass index [BMI], 27.5+/-1.3 kg x m(-2)) before and after 6- and 24-month recombinant human GH (rhGH) therapy (0.24 IU x kg(-1) x wk(-1)) compared with 10 age-, sex-, weight-, and BMI-matched control subjects. With rhGH therapy, fat-free mass (FFM) increased (48.2+/-4.9, 52.5+/-4.8, and 59+/-6.8 kg, respectively) and fat mass (FM) decreased (33.8%+/-2.8%, 28.0%+/-3.0%, and 29.4%+/-2.5%, respectively), as did serum cholesterol. Oral glucose tolerance initially deteriorated at 6 months, but improved toward the control value by 24 months. Fasting insulin (FI) increased significantly, as did the acute insulin response to oral glucose (deltaAIR(OGTT)/deltaG) at 30 minutes (FI: pretreatment 9.8+/-0.8, 6 months, 14.0+/-1.8, 24 months 12.5+/-1.6 v control 11.4+/-1.9 mU x L(-1); deltaAIR(OGTT)/deltaG: pretreatment 201+/-24, 6 months 356+/-41, 24 months 382+/-86 v control 280+/-47 mU x mmol(-1)). However, the acute insulin response to intravenous (IV) glucose (AIR(G)) and IV glucagon at euglycemia and hyperglycemia did not change with rhGH therapy and were similar to the control group values. Importantly, the expected reciprocal relationships (as observed for the control group) between the various insulin secretory parameters and insulin sensitivity (SI) either were not present or were statistically weak in GHD subjects, despite the 35% decrease in SI by 24 months of rhGH therapy. In particular, over time, there was an attenuation of insulin secretion with respect to the ongoing insulin resistance with rhGH therapy, particularly for AIR(G) at 24 months. After 5 days of rhGH withdrawal, insulin secretion decreased and SI improved in GHD subjects. It is concluded that the current long-term rhGH treatment regimens appear to impact on insulin secretion such that the normal relationships between insulin secretion and SI are altered despite the favorable impact on body composition and serum lipid profiles.

My mother's gift--the link between honesty and hope

Doctors and other care providers often refuse to be direct and straightforward with patients needing end-of-life care because they do not want to take away hope. But the resiliency of hope is not linked with continuing life. Using introspection, a review of the literature, and a sampling of opinions gleaned from members and friends of the Midwest Bioethics Center, the author of this article concludes that all patients should be given full and forthright knowledge about the prognoses--not in spite of the patient's need for hope, but in hope's service.

PATHWAYS to improve end-of-life care--a community approach

Midwest Bioethics Center responded to the SUPPORT study with a strategic initiative called PATHWAYS to Improve End-of-Life Care: A Community Approach. This article introduces that initiative and reviews its substantial contributions in the broad sense. The effects of this program, although its evaluation has yet to be completed, are far-reaching because PATHWAYS tackled the problem of dying, not as a medical problem, but as a problem for the community as a whole.

Defects of insulin action and skeletal muscle glucose metabolism in growth hormone-deficient adults persist after 24 months of recombinant human growth hormone therapy

We have previously reported that GH-deficient (GHD) adults are severely insulin resistant. In the present study, we determined the effects of 6 months (n = 7) and 24 months (long-term; n = 11) of recombinant human GH (rhGH) therapy (approximately 0.22 IU/kg.week) on body composition and fasting biochemical (including lipid) parameters, and baseline and insulin-stimulated: 1) rates of hepatic glucose production, total glucose disposal (Rd), total glycolysis (GF) and glucose storage (GS); and 2) skeletal muscle glucose processing [using the euglycemic-hyperinsulinemic (approximately 60 mU/L) clamp technique with tritiated glucose infusion coupled with skeletal muscle biopsies]. To allow baseline comparison, these measurements were also obtained from 10 control subjects matched to the pretreated GHD adults for age, sex, and body mass index. Long-term rhGH therapy in GHD adults induced significant improvements in fat mass, abdominal fat mass and fat free mass, and reductions in fasting cholesterol and low-density lipoprotein-cholesterol levels (P < 0.05-0.01 vs. pretreatment values). However, there was a significant increase in fasting insulin (13.1 +/- 0.9 vs. 8.6 +/- 1.1 mU/L; P < 0.01) and connecting peptide (0.56 +/- 0.05 vs. 0.41 +/- 0.06 nmol/L; P < 0.05). Although rates of baseline hepatic glucose production, GF, and GS were unchanged, the insulin-stimulated increment (delta) in Rd, GF, and GS remained markedly attenuated in the long-term rhGH-treated GHD adults [pretreatment: delta Rd 16.6 +/- 3.4, delta GF 3.0 +/- 1.2, delta GS 13.6 +/- 3.0 vs. 24 months of rhGH: delta Rd 17.2 +/- 3.3, delta GF 3.1 +/- 0.9, delta GS 14.1 +/- 2.5 vs. controls: delta Rd 42.6 +/- 4.3, delta GF 9.2 +/- 1.9, delta GS 35.9 +/- 4.5 mumol/kg fat free mass.min; P < 0.05-0.01 vs. controls]. Additionally, there was a sustained reduction in the insulin-stimulated skeletal muscle glycogen synthase fractional velocity (pretreatment: 0.29 +/- 0.03 vs. 24 months of rhGH: 0.24 +/- 0.03 vs. controls: 0.48 +/- 0.04; both P < 0.05 vs. controls), which was accompanied by a sustained 44% decrease in baseline glycogen content and a 70% increase in baseline im glucose concentrations in the presence of low-to-normal glucose 6-phosphate levels and persisting euglycemia. Stepwise regression analysis revealed that body weight and fasting free fatty acid and high-density lipoprotein (HDL)-cholesterol accounted for 82% of the variance in the insulin sensitivity index in long-term rhGH-treated adults, and that the 24-month fasting insulin-like growth factor 1 was a negative predictor of the change in insulin sensitivity (r = -0.82; P < 0.01). In conclusion, despite improvements in body composition and lipid profiles, the severe defects of in vivo insulin sensitivity and skeletal muscle intracellular glucose phosphorylation and glycogen synthase activity, which are associated with modestly elevated insulin-like growth factor 1 levels, normal free fatty acid levels, and the development of hyperinsulinemia, persist with long-term rhGH therapy.

Peritoneal fluid analysis in peripartum mares

OBJECTIVE

To characterize, in mares, changes in peritoneal fluid that occurred within the first 7 days after routine foaling.

DESIGN

Prospective observational trial.

ANIMALS

15 mares.

PROCEDURE

Abdominocentesis was performed within 10 days before foaling and again 12 hours, 3 days, and 7 days after each horse foaled. Data recorded for each sample included total nucleated cell count, differential cell count, specific gravity, fibrinogen concentration, and total protein concentration. Smears of each sample were examined by a single clinical pathologist.

RESULTS

There were not any significant differences over time in specific gravity, total protein concentration, fibrinogen concentration, total nucleated cell count, or number of small mononuclear cells. Mean numbers of neutrophils and large mononuclear cells in samples collected after foaling were significantly higher than mean numbers in samples collected before foaling. For 11 of 14 horses, all samples were characterized cytologically as transudates without cytologic abnormalities.

CLINICAL IMPLICATIONS

Results of analysis of peritoneal fluid from peripartum mares suggest that nucleated cell count, protein concentration, and specific gravity of peritoneal fluid from mares that have recently foaled should be normal. Thus, peritoneal fluid abnormalities detected in mares within a week after foaling should usually be attributed to a systemic or gastrointestinal problem and not to the foaling process itself.

Insulin resistance in growth hormone-deficient adults: defects in glucose utilization and glycogen synthase activity

Fourteen GH-deficient (GHD) adults were compared with 12 age-, sex-, and body mass index-matched control subjects using a baseline tritiated glucose equilibration period and euglycemic-hyperinsulinemic (approximately 55 mU/L) clamp in conjunction with paired muscle biopsies for measurement of glycogen synthase fractional velocity (FV0.1). Despite similar basal rates of total glucose disposal (Rd), there was a 64% reduction in the insulin-stimulated rise (delta) in Rd in the GHD adults compared to that in controls [16.6 +/- 2.8 vs. 44.7 +/- 6.0 mumol/kg fat free mass (FFM)/min; P < 0.001], which was mainly due to a decreased glucose storage (GS) rate (delta GS, 12.6 +/- 2.9 vs. 39.5 +/- 7.5 mumol/kg FFM/min; P < 0.01). Furthermore, the insulin sensitivity indexes of Rd (0.39 +/- 0.07 vs. 0.85 +/- 0.11; P < 0.05) and GS (0.25 +/- 0.07 vs. 0.72 +/- 0.13 mumol/kg FFM/min per mU/L; P < 0.02) were reduced in GHD adults compared to the control values. The insulin sensitivity of the glycolytic pathway was also reduced by approximately 50% in GHD adults (P = 0.07 vs. controls). Insulin-stimulated FV0.1 was decreased in GHD adults (0.31 +/- 0.02 vs. 0.47 +/- 0.03; P < 0.005) despite similar basal FV0.1. Using multiple and stepwise regression analysis, duration of GH deficiency, fasting triglycerides and fasting insulin accounted for 67% of the variance in the insulin sensitivity index of Rd. In conclusion, the severe insulin resistance in GHD adults is mainly due to the inhibition of the GS pathway and glycogen synthase activity in peripheral tissues, which is related to the duration of GH deficiency, fasting triglycerides, and fasting insulin.