A Rare Case of Severe Stevens-Johnson Syndrome Triggered by Topical Ofloxacin.

BACKGROUND Stevens-Johnson syndrome (SJS) is a rare dermatologic disorder that is characterized by nonspecific flu-like prodrome with fever, malaise, myalgia, cough, rhinitis, and sore eyes, followed by a characteristic rash and mucocutaneous manifestations. It is triggered by medications in up to 80% of cases in adults. In each of these cases, the medication is oral or parenteral. Severe and progressive SJS can result in life-threatening complications. Adult-onset medication-induced SJS presents within 8 weeks of exposure to the offending substance, lasting 8 to 12 days. Recovery of denuded skin generally is complete within a month. There is no consensus on treatment, but supportive care with corticosteroids is often the initial intervention. CASE REPORT A 36-year-old woman with a flare of allergic rhinitis and tearing resistant to over-the-counter options was treated with topical ophthalmic ofloxacin. She began experiencing a diffuse mucocutaneous rash, with oral desquamation, tongue swelling, vaginal desquamation, and rash of the palms and soles within 24 h, which suggested the possibility of SJS. A skin biopsy was obtained, and pathology confirmed this suspicion. She was treated with parenteral antibiotics, corticosteroids, and supportive care, and after 10 days was discharged from the hospital. She had a complete recovery in 30 days. CONCLUSIONS The clinical course of SJS induced by the ophthalmic application of medication can be just as severe as the oral or parenteral routes. This is, to the best of our knowledge, the first documented case of SJS being triggered by topical ofloxacin.

Percutaneous endovascular management of ascending aortic pseudoaneurysm after heart transplantation in a pediatric patient.

Ascending aortic pseudoaneurysm is a rare complication after HT. Surgery is the most conventional management, but in some patients, it is risky. We report the case of a ten-year-old child who underwent HT and developed an ascending aortic pseudoaneurysm in the aortic anastomosis. He was successfully treated with two covered stents through endovascular management. Endovascular therapy is an alternative management in high-risk patients. To our knowledge, this is the first report about endovascular therapy of an AAP after HT in a pediatric patient.

Medically Necessary Orthopaedic Surgery During the COVID-19 Pandemic: Safe Surgical Practices and a Classification to Guide Treatment.

BACKGROUND: Coronavirus disease 2019 (COVID-19) has rapidly evolved as a viral pandemic. Countries worldwide have been affected by the recent outbreak caused by the SARS (severe acute respiratory syndrome)-CoV-2 virus. As with prior viral pandemics, health-care workers are at increased risk. Orthopaedic surgical procedures are common in health-care systems, ranging from emergency to elective procedures. Many orthopaedic surgical procedures are life or limb-saving and cannot be postponed during the COVID-19 pandemic because of potential patient harm. Our goal is to analyze how orthopaedic surgeons can perform medically necessary procedures during the pandemic and to help guide decision-making perioperatively. METHODS: We performed a review of the existing literature regarding COVID-19 and prior viral outbreaks to help guide clinical practice in terms of how to safely perform medically necessary orthopaedic procedures during the pandemic for both asymptomatic patients and high-risk (e.g., COVID-19-positive) patients. We created a classification system based on COVID-19 positivity, patient health status, and COVID-19 prevalence to help guide perioperative decision-making. RESULTS: We advocate that only urgent and emergency surgical procedures be performed. By following recommendations from the American College of Surgeons, the Centers for Disease Control and Prevention, and the recent literature, safe orthopaedic surgery and perioperative care can be performed. Screening measures are needed for patients and perioperative teams. Surgeons and perioperative teams at risk for contracting COVID-19 should use appropriate personal protective equipment (PPE), including N95 respirators or powered air-purifying respirators (PAPRs), when risk of viral spread is high. When preparing for medically necessary orthopaedic procedures during the pandemic, our classification system will help to guide decision-making. A multidisciplinary care plan is needed to ensure patient safety with medically necessary orthopaedic procedures during the COVID-19 pandemic. CONCLUSIONS: Orthopaedic surgery during the COVID-19 pandemic can be performed safely when medically necessary but should be rare for COVID-19-positive or high-risk patients. Appropriate screening, PPE use, and multidisciplinary care will allow for safe medically necessary orthopaedic surgery to continue during the COVID-19 pandemic. LEVEL OF EVIDENCE: Prognostic Level V. See Instructions for Authors for a complete description of levels of evidence.

Assessment of trauma scoring systems in patients subjected to exploratory laparotomy / Avaliação dos escores de trauma em pacientes submetidos à laparotomia exploradora

ABSTRACT Objective: to assess the epidemiological profile of patients undergoing exploratory trauma laparotomy based on severity and prognosis criteria, and to determine the predictive accuracy of trauma scoring systems in terms of morbidity and mortality. Methods: retrospective cohort study and review of medical records of patients undergoing exploratory laparotomy for blunt or penetrating trauma at the Hospital de Pronto Socorro de Porto Alegre, from November 2015 to November 2019. Demographic data, mechanism of injury, associated injuries, physiological (RTS and Shock Index), anatomical (ISS, NISS and ATI) and combined (TRISS and NTRISS) trauma scores, intraoperative findings, postoperative complications, length of stay and outcomes. Results: 506 patients were included in the analysis. The mean age was 31 ± 13 years, with the majority being males (91.3%). Penetrating trauma was the most common mechanism of injury (86.2%), predominantly by firearms. The average RTS at hospital admission was 7.5 ± 0.7. The mean ISS and NISS was 16.5 ± 10.1 and 22.3 ± 13.6, respectively. The probability of survival estimated by TRISS was 95.5%, and by NTRISS 93%. The incidence of postoperative complications was 39.7% and the overall mortality was 12.8%. The most accurate score for predicting mortality was the NTRISS (88.5%), followed by TRISS, NISS and ISS. Conclusion: the study confirms the applicability of trauma scores in the studied population. The NTRISS seems to be the best predictor of morbidity and mortality.

RESUMO Objetivo: analisar o perfil epidemiológico dos pacientes submetidos a laparotomia exploradora por trauma com base em critérios de gravidade e prognóstico, e determinar a acurácia preditiva dos escores de trauma em termos de morbimortalidade. Métodos: estudo de coorte retrospectiva e revisão de prontuários dos pacientes submetidos a laparotomia exploradora por trauma contuso ou penetrante no Hospital de Pronto Socorro de Porto Alegre no período de novembro de 2015 a novembro de 2019. Foram avaliados dados demográficos, mecanismo do trauma, lesões associadas, índices fisiológicos (RTS e Shock Index), anatômicos (ISS, NISS e ATI) e mistos (TRISS e NTRISS), achados intraoperatórios, complicações pós-operatórias, tempo de internação e desfecho. Resultados: foram incluídos 506 pacientes na análise. A idade média foi de 31 ± 13 anos, com predomínio do sexo masculino (91,3%). O trauma penetrante foi o mecanismo de lesão mais comum (86,2%), sendo a maioria por arma de fogo. A média do RTS na admissão hospitalar foi 7,5 ± 0,7. A média do ISS e do NISS foi 16,5 ± 10,1 e 22,3 ± 13,6, respectivamente. A probabilidade de sobrevida estimada pelo TRISS foi de 95,5%, e pelo NTRISS de 93%. A incidência de complicações pós-operatórias foi de 39,7% e a mortalidade geral de 12,8%. O escore com melhor acurácia preditiva foi o NTRISS (88,5%), seguido pelo TRISS, NISS e ISS. Conclusões: o estudo confirma a aplicabilidade dos escores de trauma na população em questão. O NTRISS parece ser o sistema com melhor acurácia preditiva de morbimortalidade.

Growth prediction in asymptomatic meningiomas: the utility of the AIMSS score.

BACKGROUND: Management of asymptomatic meningiomas represents a challenge due to the absence of a solid consensus on which is the best management strategy. There are various known factors predicting meningiomas growth risk. However, the Asian Intracranial Meningioma Scoring System (AIMSS) is the only described score to quantify such risk thus emerging as a potential tool for management decisions. This study aims to validate this score on our series of asymptomatic meningiomas. METHOD: We performed a retrospective review of asymptomatic meningiomas diagnosed at our institution between January 2008 and October 2016 and followed by an annual cerebral Magnetic Resonance Imaging (MRI). For each lesion, the AIMSS score was calculated thus classifying them in low (0-2), intermediate (3-6) or high risk (7-11) of rapid growth (>2cm3/year). We investigated the correlation between the expected Average Growth Rate (AGR) according to the score and the one obtained in our study. The mean growth velocity over the different risk groups was also compared. RESULTS: Overall, 69 asymptomatic meningiomas found incidentally in 46 patients were included in the study; 31 were assigned to the low-risk group, 34 to the intermediate-risk group and 4 to the high-risk group. Attending to the AGR, 0% showed rapid growth in the low-risk group, 12% in the intermediate-risk group, and 25% in the high-risk group. The mean growth velocity showed a significant difference over the different risk groups (p < 0,001). CONCLUSIONS: According to our finding, the AIMSS score is a valid tool to estimate the risk of rapid growth of asymptomatic meningiomas. It is especially useful distinguishing between low- and intermediate-risk meningiomas. This feature would allow physicians to adjust the periodicity of radiological and clinical controls. Adding more known risk factors of rapid growth to the score might improve its predictive capabilities with the high-risk group.

Hipertensión pulmonar en niños / Pulmonary hypertension in Peruvian children

Resumen Introducción: Poco se ha estudiado acerca del comportamiento de la hipertensión pulmonar en pediatría en población peruana, incluso en el mundo, la información es deficiente, de ahí la necesidad de desarrollar estudios y registros para la orientación del diagnóstico y tratamiento oportuno. Material y métodos: Estudio retrospectivo, observacional, transversal, en el que se incluyeron pacientes de 3 meses hasta 15 años de edad, con diagnóstico de hipertensión pulmonar, sometidos a estudio hemodinámico por cateterismo cardíaco en INCOR, entre enero de 2015 a diciembre de 2016 (2 años). Resultados: Se diagnosticaron 57 pacientes con hipertensión pulmonar, 51% varones, de los cuales 22% procedían de una altura mayor 2.500 metros sobre el nivel del mar. Grupo etario predominante 1-3 años. Clase funcional II 49%. Síndrome de Down (16%). La comunicación interventricular / ducto arterioso persistente (CIV / PCA) fue la cardiopatía más frecuente. El grupo 1(NICE2013) fue el más frecuente con 51 casos (89,5%); dentro de éste resalta el grupo asociado a cardiopatías congénitas (48 casos), mientras que en el grupo 2 se clasificaron 6 casos (10,5%). La presión arterial pulmonar media más frecuente fue mayor 40 mm Hg, con aumento de RVPi y RVP/ RVS, leve a moderado. Se realizaron pruebas de vasorreactividad en 14 pacientes (24%), la cual fue positiva en 12 de 14 casos. En el 52% de los casos se decidió la reparación quirúrgica del defecto. Conclusión: Este estudio constituye el primer registro de hipertensión pulmonar en niños peruanos en el que se halló que aquellos con esta enfermedad presentan características propias, según los distintos grupos; así mismo, la asociación a cardiopatías congénitas fue importante. Se recomienda el tratamiento oportuno y pronóstico, ya que el compromiso vascular puede estar presente en estadios clínicamente no significativos.

Abstract Introduction: There have been few studies on the behaviour of pulmonary hypertension in paediatrics in the Peruvian population. Even in the world, there is insufficient information. Thus, there is a need to develop studies and registers in order to focus on a timely diagnosis and treatment. Material and methods: A retrospective, observational and cross-sectional study was performed. Patients from 3 months to 15 years of age and with a diagnosis of pulmonary hypertension, and subjected to a haemodynamic study by cardiac catheterisation in INCOR (National Cardiovascular Institution) were included between January 2015 and December 206 (2 years). Results: Out of a total of 57 patients diagnosed with pulmonary hypertension, 51% were males of whom 22% came from an altitude greater than 2,500 metres above sea level. The age group were predominantly from 1 -3 years. Just under half (49% were functional class II, and 16% had Down's syndrome. Left ventricular growth (LVG) +/- Patent ductus arteriosus (PDA) was the most frequent cardiac disease. Group 1 1(NICE 2013) was the most frequent with 51 (89.5%) cases. Within this, the group associated to congenital heart disease (48 cases) is highlighted, while 6 cases (10.5%) were classified in Group 2. The most frequent mean pulmonary arterial pressure was greater than 40 mm Hg, with a mild to moderate increase in indexed pulmonary vascular resistance (iPVR and pulmonary vascular resistance (PVR)/ pulmonary vascular resistance (PVS). Vasoreactivity tests were performed on 14 (24%) patients, which was positive in 12 of the 14 cases. Surgical repair of the defect was decided in 52% of cases. Conclusion: This study forms the first register of pulmonary hypertension in Peruvian children, in which it was found that children with this disease have their own characteristics, according to the different groups. Likewise, the relationship with congenital cardiac disease was important. Timely and prognostic treatment is recommended, since the vascular compromise can be present clinically non-significant states.

Sexual dysfunction in Spanish women with breast cancer.

PURPOSE: To determine whether there are changes in sexuality after breast cancer, to better understand the sexual function of women with breast cancer, and to investigate the potential relationship between sexual dysfunction and socio-demographic and clinical variables. METHODS: A cross-sectional study. This study included 514 women with breast cancer between 21- and 66-years-old. The cases were gathered between June 2016 and January 2017. The instruments used were the questionnaire on Women's Sexual Function and a questionnaire to collect socio-demographic and clinical data. RESULTS: The average age (± standard deviation, SD) of participants was 46.34 ± 8.28 years. Their average age at date of diagnosis was 42.26 ± 8.56 years, and the average time suffering from cancer was 4.05 ± 5.23 years. There were significant differences (p = 0.002) in the presence of sexual dysfunction before (32.1%) and after (91.2%) cancer. The primary sexual dysfunctions were due to penetration pain (50.6%), lubrication (50.6%), dysfunctional desire (44.6%), and dysfunctional excitement (44.6%). Two-thirds of participants were satisfied with their sexual relations. The women who presented most sexual dysfunction were those that had a bilateral mastectomy (p = 0.009) and those who received chemotherapy, radiotherapy and hormonal-therapy (p < 0.001). CONCLUSION: Sexual function was changed in women with breast cancer. The main problems included penetration pain, desire, lubrication, and dysfunctional excitement. It is important that Health professionals recognize which circumstances influence the sexual function of women with breast cancer and to make interventions that facilitate sexual adjustment.

[Comparative study of habits in students before and during the university in northwest area of Madrid]. / Estudio comparativo de hábitos entre estudiantes universitarios y preuniversitarios de la zona noroeste de Madrid.

INTRODUCTION: In most Western countries young people adopt lifestyles that adversely affect their health, thus increasing the risk of premature onset of chronic diseases. Therefore, the aim of this study was to compare patterns of habits in pre-university and university students in west-central area of Madrid. MATERIALS AND METHODS: Descriptive longitudinal study with randomly selected students from Madrid in Madrid universities and schools-institutes. Accepting to participate 1590 students of both sex: 653 males (4,1%) and 937 women (58,9%). To facilitate the study were classified into ≤ 17 years (pre university) and ≥ 18 years (university). RESULTS: BMI, physical activity, alcohol consumption and negative habits with regard to food consumption was studied. Almost 80% have normal weight, are more active pre-university. CONCLUSIONS: Gender differences were observed, which should guide the actions of intervention in terms of physical activity or habits. It seems essential to make nutritional programs as well as psychosocial intervention in adolescents and youth to prevent and / or reduce alcohol consumption.

Introducción: En la mayoria de los paises occidentales los jovenes, adoptan estilos de vida que afectan negativamente a su salud, incrementando de esta manera el riesgo de la aparicion prematura de enfermedades cronicas. Objetivo: Comparar los patrones de habitos en estudiantes preuniversitarios y universitarios en la zona noroeste de Madrid. Material y método: Estudio longitudinal descriptivo con estudiantes madrilenos de universidades madrilenas y colegios-institutos de la zona centro-oeste de Madrid capital, aceptando participar 1590 alumnos de ambos sexos preuniversitarios y universitarios: 653 varones (41,1%) y 937 mujeres (58,9%). Se clasifico a los estudiantes en grupos etarios, ≤ 17 anos y ≥ 18 anos Resultados: Se estudia el IMC, la actividad fisica, el consumo de alcohol y los habitos negativos en cuanto al consumo de alimentos. Casi el 80% presenta normo peso, son mas activos los preuniversitarios. Conclusión: Se han constatado diferencias entre sexos, que deben guiar las actuaciones de intervencion en cuanto a la actividad fisica o habitos, por lo que parece fundamental realizar programas de intervencion nutricional y psicosocial en los adolescentes y jovenes para prevenir y/o reducir el consumo de alcohol.

Wave reflection at a stent.

A simple analytical expression has been derived to calculate the characteristics of a wave that reflects at a stent implanted in a uniform vessel. The stent is characterized by its length and the wave velocity in the stented region. The reflected wave is proportional to the time derivative of the incident wave. The reflection coefficient is a small quantity of the order of the length of the stent divided by the wavelength of the unstented vessel. The results obtained coincide with those obtained numerically by Charonko et al. The main simplifications used are small amplitude of the waves so that equations can be linearized and that the length of the stent is small enough so that the values of the wave functions are nearly uniform along the stent. Both assumptions hold in typical situations.

Effects of digital tourniquet ischemia: a single center study.

BACKGROUND: There is little information regarding the detrimental effects of tourniquet ischemia, although it is a widely used technique in extremity surgery. We endeavored to study some of the physiologic changes involved in the finger during the ischemic phase and throughout the recovery phase after tourniquet release. MATERIALS AND METHODS: This was a single-center, prospective observational study involving healthy adults designed to assess the appropriate application time of a digital T-ring tourniquet without a pH or acidosis <7.0 to avoid any potential risk to local tissues. RESULTS: There was no pH difference before tourniquet application between men and women, but after tourniquet application, the women's fingers became more acidotic at 10 and 20 minutes than the mens', but after 30 minutes the acidosis of the two groups was similar. Participants who weighed less had a more acidotic pH level than heavier participants. LIMITATIONS: This study was performed in a laboratory setting on healthy people rather than on those with existing medical conditions, so clinical recommendations cannot be explicitly made. CONCLUSION: Tourniquet application time is precious. While operating under tourniquet control, the extremity becomes increasingly acidotic. Tourniquet ischemia longer than 20 minutes causes local acidosis and muscle fatigue. Women and persons who weighed less could reach acidotic pH values faster than men or heavier patients. If applications longer than 20 minute are expected, the tourniquet should be released at 20 minutes, allowing the finger to reperfuse for 3-5 minutes to clear the acidosis before reapplication of tourniquet.

Retroperitoneal fibrosis: single-centre experience from 1992 to 2010, current status of knowledge and review of the international literature.

OBJECTIVE: The aims of this study were to investigate retroperitoneal fibrosis in a Spanish hospital and present a review of the international literature to attempt to elucidate a diagnostic and therapeutic approach to this unusual pathology. MATERIAL AND METHODS: A database search was performed in the pathology department and in the documentation service using the key words "retroperitoneal fibrosis" and "Ormond's disease", limiting the search to the years 1990-2010. Cases in which secondary retroperitoneal fibrosis was considered were excluded. In addition, a PubMed literature search was performed using the terms "retroperitoneal fibrosis" and "Ormond's", limiting the search to 1985-2011. RESULTS: Twenty-two patients were diagnosed with idiopathic retroperitoneal fibrosis (IRF) or Ormond's disease. The most common symptom at the time of diagnosis was flank pain. With regard to laboratory findings, five patients (22.7%) had anaemia and eight (36.3%) had renal failure. Computed tomography (CT) was performed in 20 patients (90.9%) and the most common finding observed was retroperitoneal mass. Eighteen patients were started on corticosteroids, in six cases in association with azathioprine. Three patients had recurrence at 12, 24 and 72 months, respectively, and 15 patients required emergency surgery. Nine open surgical procedures were performed. CONCLUSIONS: At present, IRF is considered an autoimmune disease that presents with local and systemic signs and symptoms. CT and magnetic resonance imaging are the two tests of choice in IRF diagnosis and follow-up. [(18)F]Fluorodeoxyglucose positron emission tomography is starting to be used for assessment and treatment response. A combination of medical and surgical treatment is usually applied. It is essential to administer corticosteroids alone or in association with other immunosuppressive drugs such as azathioprine. Laparoscopic ureterolysis, or robotic ureterolysis, if available, is the technique of choice.

Surgical treatment in a case of giant scrotal lymphedema.

OBJECTIVE: Scrotal lymphedema (SL) is a rare clinical pathology with multiple etiologies. We report a case of idiopathic giant scrotal lymphedema and review the existing medical literature in Medline from the last ten years. METHODS: We report the case of a male patient with a giant scrotal lymphedema (43×40 cm) of unknown etiology developed over four years. RESULTS: The patient was treated by scrotal excision and reconstruction with skin graft plasty, with a successful result. CONCLUSIONS: Scrotal Lymphedema is a rare entity, especially in industrialized countries. If the lymphedema is severe, surgery is the most appropriate therapeutic option, whatever the cause is. Complete resection up to healthy tissue and surgical reconstruction is the choice. Thin skin grafts are necessary for reconstruction when it affects the entire scrotum.

Sertoli cell tumor, a rare testicular tumor, our experience and review of the literature.

OBJECTIVE: We report two new cases of Sertoli cell testicular tumors, and a Cochrane and Medline search of cases published worldwide. METHODS: We reviewed our series of testicular tumors, the stromal tumor incidence, clinical presentation, treatment and prognosis, and the experience reflected in the literature. RESULTS: The prevalence of testicular tumors in our health area is of 0.09%, and 2.3% of them are Sertoli cell neoplasms. This figure is slightly higher than the found in other series in which Sertoli tumors range from 0.4% to 1.5% of testicular malignancies in adults and reach 4% in children. CONCLUSIONS: Sertoli cell tumor has an incidence not exceeding 4%. The most common symptom is a painless mass; in cases with endocrine manifestation, up to 10% are malignant depending on the age of the patient.

Increased serum sFas and TNFalpha following isolated severe head injury in males.

OBJECTIVES: Severe traumatic brain injury (TBI) is associated with a 30-70% mortality rate. Nevertheless, controversy has been raised concerning the prognostic value of biomarkers following severe TBI. Therefore, our aim was to determine whether sFas or TNFalpha serum levels correlate with primary outcome following isolated severe TBI. METHODS: Seventeen consecutive male patients, victims of isolated severe TBI (Glasgow Coma Scale score 3-8) and a control group consisting of 6 healthy male volunteers were enrolled in this prospective study. Clinical outcome variables of severe TBI comprised: survival, time for intensive care unit (ICU) discharge, and neurological assessment by Glasgow Outcome Scale at ICU discharge. Venous blood samples were taken at admission in the ICU. Serum sFas and TNFalpha concentrations were measured by ELISA assays. RESULTS: At admission in the ICU (mean time 10.2 h after injury), mean sFas and TNFalpha concentrations were significantly increased in the TBI (0.105 and 24.275 rhog/l, respectively) compared with the control group (0.047 and 15.475 rhog/l, respectively). However, no significant correlation was found between higher serum sFas or TNFalpha concentrations and fatal outcome. CONCLUSIONS: Increased serum sFas and TNFalpha levels following isolated severe TBI did not predict fatal outcome.

Assessment of some blood parameters as potential markers of hepatic copper accumulation in cattle.

The increasing frequency of copper (Cu) toxicosis episodes in cattle in recent years, mainly associated with excess Cu supplementation, underscores the need to identify animals in the clinically silent phase of hepatic Cu accumulation. The aim of the study reported here was to evaluate the suitability of various blood parameters as potential early markers of hepatic Cu accumulation in cattle. Paired liver and blood samples from 70 calves aged 6 to 10 months were obtained at slaughter in a region in northwestern Spain where animals usually have hepatic Cu concentration higher than safe values. Neither serum Cu concentration nor ceruloplasmin (CP) concentration, the 2 parameters most commonly used for diagnosis of Cu deficiency, were significantly associated with hepatic Cu concentration. However, whole-blood Cu concentration had a slight but significant correlation with hepatic Cu concentration (r = 0.269, P = 0.026). The use of calculated blood parameters, such as the serum or whole-blood non-CP Cu fraction, or the CP-to-serum Cu ratio, increased the correlation with the hepatic Cu concentration (r = 0.393, P = 0.001, in the case of whole-blood, non-CP Cu concentration), but the strength of the association remained insufficient for accurate prediction of hepatic Cu values. Likewise, hepatic enzyme (aspartate transaminase and gamma-glutamyltransferase) activities were significantly or nearly correlated significantly with hepatic Cu concentration, but the strength of the association remained too low for accurate prediction. It is concluded that direct analysis of Cu concentration in liver biopsy specimens--preferably postmortem liver samples obtained at slaughter--is the best technique currently available for detecting chronic subclinical Cu accumulation in cattle at risk for supraoptimal Cu exposure.