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1.
Osteoporos Int ; 32(11): 2361-2364, 2021 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-33950266

RESUMEN

Vertebral fractures (VF) related to osteoporosis (i.e., severe OP) increase the risk of disability and mortality, but they are often neglected. We observed a severe OP misdiagnosis in 28.9% of inpatients with previous spinal imaging positive for VFs. Diagnosing severe OP is crucial to reduce the health care costs of inpatients. INTRODUCTION: Vertebral fractures (VFs) related to osteoporosis (OP) increase the risk of additional fractures and death. In inpatients, VFs are often neglected with consequent delay in OP treatments, prolongation of hospitalization, and reduction of life expectancy. The aim of this study was to evaluate the prevalence of a misdiagnosed severe OP (i.e., with VF) in general medicine inpatients. METHODS: We evaluated inpatients of a Medicine Unit between January 2019 and December 2019 without severe OP diagnosis, who had spinal imaging. For each patient, we collected demographic data, previous or current OP treatment, and presence/number of VFs. Descriptive data were presented by medians (interquartile range [IQR]) for continuous data or as numbers (percentages) for categorical data. Differences between subgroups were analyzed with chi-square or Kruskal-Wallis tests as appropriate. p-values <0.05 were considered statistically significant. RESULTS: 793 subjects were admitted to inpatient's clinic: 235 (135 females and 100 males with a median age of 76.0 [64.0-83.0] years) were enrolled. One or more vertebral fractures were present in 28.9% (68/235) subjects; 47% (32/68) had two or more vertebral fractures. The majority of patients (55/68) with VFs had not previously received a severe OP diagnosis. CONCLUSIONS: Severe OP was misdiagnosed in at least 8.6% of inpatients. The prevalence dramatically increases (about 29%) in subjects with previous spinal imaging showing one or more VFs. More attention should be given to this co-morbidity, which is known to be an additional risk factor for disability and mortality.


Asunto(s)
Osteoporosis , Fracturas Osteoporóticas , Fracturas de la Columna Vertebral , Absorciometría de Fotón , Anciano , Anciano de 80 o más Años , Estudios Transversales , Errores Diagnósticos , Femenino , Humanos , Pacientes Internos , Medicina Interna , Masculino , Persona de Mediana Edad , Osteoporosis/diagnóstico , Osteoporosis/epidemiología , Fracturas Osteoporóticas/diagnóstico , Fracturas Osteoporóticas/epidemiología , Fracturas Osteoporóticas/etiología , Prevalencia , Fracturas de la Columna Vertebral/diagnóstico por imagen , Fracturas de la Columna Vertebral/epidemiología
2.
Reumatismo ; 73(2): 71-88, 2021 Aug 03.
Artículo en Inglés | MEDLINE | ID: mdl-34342209

RESUMEN

Over the last few years, the landscape of treatments for axial spondyloarthritis (SpA) has been rapidly evolving, urging international scientific societies to draft or update existing clinical practice guidelines (CPGs) on the management of axial SpA. The Italian Society for Rheumatology (SIR) committed to provide revised and adapted evidence- and expert-based recommendations for the management of patients with axial SpA in Italy. A systematic approach to the adaptation of existing CPGs - the ADAPTE methodology - was adopted to obtain updated recommendations suitable for the Italian context. A systematic literature search was performed in Medline and Embase databases to find international CPGs and consensus statements with recommendations for the management of axial SpA published in the previous five years. A working group composed of rheumatologists with proven experience in the management of axial SpA and methodologists identified the key research questions which guided study selection and data extraction. Guideline quality was assessed using the Appraisal of Guidelines Research and Evaluation (AGREE) II tool. The Italian recommendations were developed by endorsing or adapting and rewording some existing recommendations. The draft of the recommendations was sent to a multidisciplinary group of external reviewers for comment and rating. Six original CPGs were selected and used to create this SIR CPG, which includes a final set of 14 recommendations covering the management of patients with axial SpA across the following domains: assessment, pharmacological and non-pharmacological treatment, and follow-up. The dissemination and implementation of these SIR recommendations are expected to support an evidencebased clinical approach to the management of patients with axial SpA in Italy.


Asunto(s)
Reumatología , Espondiloartritis , Consenso , Humanos , Italia , Reumatólogos , Espondiloartritis/diagnóstico , Espondiloartritis/terapia
3.
Reumatismo ; 73(2): 89-105, 2021 Aug 03.
Artículo en Inglés | MEDLINE | ID: mdl-34342210

RESUMEN

Fibromyalgia or fibromyalgia syndrome (FMS) is defined as a central sensitization syndrome characterized by the dysfunction of neurocircuits detecting, transmitting and processing nociceptive stimuli; the prevalent manifestation is musculoskeletal pain. In addition to pain, there are multiple accompanying symptoms, in common with other algo-dysfunctional syndromes, which are reflected in a broad spectrum of somatic, neurocognitive and neuro-vegetative manifestations. An evidence-based approach is essential in FMS management, in order to improve patient health and to reduce its social burden. Since in the last ten years new international guidelines for clinical practice (Clinical Practice Guidelines or CPGs) concerning FMS diagnosis and pharmacological/ non-pharmacological management have been published, the Italian Society of Rheumatology (SIR) has decided to adapt them to the Italian national setting. The framework of the Guidelines International Network Adaptation Working Group was adopted to identify, appraise (AGREE II), synthesize, and customize the most recent CPGs on FMS to the needs of the Italian healthcare context. A working group of rheumatologists from SIR epidemiology unit and FMS experts identified relevant clinical questions to guide the systematic review of the literature. The target audience of these CPGs included physicians and healthcare professionals who manage FMS. The adapted recommendations were finally assessed by an external multidisciplinary panel. From the systematic search in databases (Pubmed/Medline, Embase) and grey literature, 6 CPGs were selected and appraised by two independent raters. The combination of the scientific evidence underlying the original CPGs with expert opinion lead to the development of 17 recommendations. The quality of evidence for each recommendation was reported and their potential impact on clinical practice was assessed. These SIR recommendations are expected to be a valuable aid in the diagnosis and treatment of FMS, as they will contribute to disseminate the best practice on the basis of the current scientific evidence.


Asunto(s)
Fibromialgia , Reumatología , Fibromialgia/diagnóstico , Fibromialgia/terapia , Humanos , Italia
4.
Reumatismo ; 72(1): 1-15, 2020 Apr 10.
Artículo en Inglés | MEDLINE | ID: mdl-32292016

RESUMEN

OBJECTIVE: to provide evidence-based up-to-date recommendations for the management of patients with a definite diagnosis of polymyalgia rheumatica (PMR). METHODS: A systematic literature review was performed to find the existing clinical practice guidelines (CPGs) on PMR and the framework of the Guidelines International Network Adaptation Working Group was used to appraise (AGREE II), synthesize, and customize the recommendations according to the needs of the Italian healthcare context. Rheumatologists on behalf of the Italian Society of Rheumatology (SIR) and from the SIR Epidemiology Unit joined the working group and identified the key health questions on PMR to guide the systematic literature review. Physicians, including general practitioners and specialists, and health professionals who manage PMR in the clinical practice were the target audience. The final recommendations were rated externally by a multi-disciplinary and multi-professional group of stakeholders. RESULTS: From the systematic search in databases (Medline, Embase) and grey literature, 3 CPGs were identified and appraised by two independent raters. Combining the statements and the evidence from these CPGs, 9 recommendations were developed by endorsement or adaptation in response to the initial key health questions. The quality of evidence was graded and the working group discussed the final recommendations in view of their implementation in the Italian healthcare context. CONCLUSIONS: In absence of national guidelines so far, these recommendations are the first to provide guidance for the management of patients with a diagnosis of PMR in Italy and they are expected to ensure the best evidence-based clinical practice for this disease.


Asunto(s)
Polimialgia Reumática/diagnóstico , Polimialgia Reumática/terapia , Reumatología/normas , Antiinflamatorios no Esteroideos , Técnicas de Laboratorio Clínico , Diagnóstico por Imagen/métodos , Europa (Continente) , Terapia por Ejercicio , Estudios de Seguimiento , Glucocorticoides/administración & dosificación , Glucocorticoides/uso terapéutico , Humanos , Inmunosupresores/uso terapéutico , Italia , Metotrexato/uso terapéutico , Polimialgia Reumática/tratamiento farmacológico , Derivación y Consulta , Sociedades Médicas , Participación de los Interesados
7.
Reumatismo ; 71(S1): 5-21, 2019 Sep 23.
Artículo en Inglés | MEDLINE | ID: mdl-31948191

RESUMEN

Osteoarthritis (OA) is the most common musculoskeletal disease leading to functional decline and loss in quality of life. Knees, hands and hips are frequently affected joints with a relevant clinical and socio-economic burden. An evidence-based approach to OA management is essential in order to improve patients' health and to decrease social burdens. Since new international clinical practice guidelines (CPGs) focused on diagnosis or pharmacological/non-pharmacological treatment have become available in the last ten years, the Italian Society for Rheumatology (SIR) was prompted to revise and customize them for a multidisciplinary audience of specialists involved in the management of OA. The framework of the Guidelines International Network Adaptation Working Group was adopted to identify, appraise (AGREE II), synthesize, and customize the existing CPGs on OA to the needs of the Italian healthcare context. The task force, consisting of rheumatologists from the SIR epidemiology research unit and a committee with experience of OA, identified key health questions to guide a systematic review of published guidelines. The target audience included physicians and health professionals who manage OA. An external panel of stakeholders rated the guidelines. From a systematic search in databases (Pubmed/Medline, Embase) and grey literature, 11 CPGs were selected and appraised by two independent raters. Combining evidence and statements from these CPGs and clinical expertise, 16 guidelines were developed and graded according to the level of evidence. Agreement and potential impact on clinical practice were assessed. These revised guidelines are intended to provide guidance for diagnosis and treatment of OA and to disseminate best evidence-based strategies management of the disease.


Asunto(s)
Articulaciones de la Mano , Osteoartritis de la Cadera/diagnóstico , Osteoartritis de la Cadera/terapia , Osteoartritis de la Rodilla/diagnóstico , Osteoartritis de la Rodilla/terapia , Osteoartritis/diagnóstico , Osteoartritis/terapia , Humanos
8.
Reumatismo ; 71(S1): 50-79, 2019 Sep 23.
Artículo en Inglés | MEDLINE | ID: mdl-31948193

RESUMEN

Gout is a chronic disease with an increased risk of premature death related to comorbidities. Treatment of gout has proved suboptimal and clinical practice guidelines (CPGs) are expected to have a key role in achieving improvement. Since new evidence has become available, the Italian Society for Rheumatology (SIR) has been prompted to update the 2013 recommendations on the diagnosis and management of gout. The framework of the Guidelines International Network Adaptation Working Group was adopted to identify, appraise (AGREE II), synthesize, and customize the existing gout CPGs to the needs of the Italian healthcare context. The task force consisting of rheumatologists from the SIR Epidemiology Unit and a committee with experience on gout identified key health questions to guide a systematic literature review. The target audience includes physicians and health professionals who manage gout in practice, and the target population includes adult patients suspected or diagnosed as having gout. These recommendations were finally rated by an external multi-disciplinary commission. From a systematic search in databases (Medline, Embase) and grey literature, 8 CPGs were selected and appraised by two independent raters. Combining evidence and statements from these CPGs and clinical expertise, 14 recommendations were developed and graded according to the level of evidence. The statements and potential impact on clinical practice were discussed and assessed. These revised recommendations are intended to provide guidance for the diagnosis and the treatment of gout and to disseminate the best evidence-based healthcare for this disease.


Asunto(s)
Gota/diagnóstico , Gota/terapia , Humanos
9.
Reumatismo ; 71(S1): 22-49, 2019 Sep 23.
Artículo en Inglés | MEDLINE | ID: mdl-31948192

RESUMEN

Rheumatoid arthritis (RA) is a chronic inflammatory autoimmune disorder characterised by chronic joint inflammation, leading to functional disability and increased risk of premature death. Clinical practice guidelines (CPGs) are expected to play a key role in improving management of RA, across the different phases of the disease course. Since new evidence has become available, the Italian Society for Rheumatology (SIR) has been prompted to update the 2011 recommendations on management of RA. The framework of the Guidelines International Network Adaptation Working Group was adopted to identify, appraise (AGREE II), synthesize, and customize the existing RA CPGs to the Italian healthcare context. The task force consisting of rheumatologists from the SIR Epidemiology Research Unit and a committee with experience in RA identified key health questions to guide a systematic literature review. The target audience includes physicians and health professionals who manage RA in practice, and the target population includes adult patients diagnosed as having RA. An external multi-disciplinary committee rated the final version of the CPGs. From the systematic search in databases (Medline, Embase) and grey literature, 6 CPGs were selected and appraised by two independent raters. Combining evidence and statements from these CPGs and clinical expertise, 8 (Management) +6 (Safety) recommendations were developed and graded according to the level of evidence. The statements and potential impact on clinical practice were discussed and assessed. These revised recommendations are intended to provide guidance for the management of RA and to disseminate the best evidence-based clinical practices for this disease.


Asunto(s)
Artritis Reumatoide/diagnóstico , Artritis Reumatoide/terapia , Humanos
10.
J Biol Regul Homeost Agents ; 28(3): 507-13, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-25316138

RESUMEN

The pulmonary fibrosis extent in systemic sclerosis (SSc) has a prognostic value. Chest Computed Tomography (CT) is the gold standard to detect an interstitial lung disease (ILD). Semi-quantitative scores and quantitative methods can estimate the ILD. The first ones have a considerable inter-intraobserver variability, while quantitative scores, based on distribution of lung attenuation parameters (also called CT indexes), can be obtained through expensive and not so user-friendly software. The aim of this work is to investigate whether a DICOM-viewer open-source software (OsiriX) can obtain CT indexes correlating with semi-quantitative scores. Sixty-three chest CTs of ILD-SSc patients were assessed with two semi-quantitative methods (visual extent and limited/extensive ILD grading) and then blindly processed with OsiriX to obtain the distribution parameters of lung attenuation (kurtosis, skewness and mean). Semiquantitative assessment and CT indexes were compared through the Spearman rank test and Mann-Whitney test. All CT indexes showed a statistically significant correlation of moderate degree with the visual extent semi-quantitative assessment (p-value less than 0.05). Skewness was the lung attenuation distribution parameter with the strongest correlation (r =-0.378, p-value = 0.0023). Moreover, CT indexes of patients with an extensive and limited disease were statistically different (p less than 0.01). CT indexes correlating with a radiological semi-quantitative ILD assessment can be obtained through OsiriX. CT indexes can be considered very helpful to discriminate patients with extensive and limited ILD.


Asunto(s)
Procesamiento de Imagen Asistido por Computador/métodos , Enfermedades Pulmonares Intersticiales/diagnóstico por imagen , Esclerodermia Sistémica/diagnóstico por imagen , Programas Informáticos , Tomografía Computarizada por Rayos X/métodos , Anciano , Femenino , Humanos , Masculino , Persona de Mediana Edad
11.
Drugs Today (Barc) ; 57(9): 543-550, 2021 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-34586102

RESUMEN

Rheumatoid arthritis (RA) is a chronic autoimmune disease characterized by joint inflammation and progressive disability when inflammation cannot be sufficiently controlled. Despite treatment with conventional synthetic disease-modifying antirheumatic drugs (csDMARDs) and biological DMARDs (bDMARDs), up to 30% of RA patients do not reach or fail to maintain a good response over time. The recent introduction of Janus kinase inhibitors (JAKis) has widened the rheumatologist's armamentarium. Filgotinib, a selective JAK1 inhibitor, has been approved by the European Medicines Agency (EMA) for treatment of RA. Phase II and III studies highlighted filgotinib safety and efficacy in RA patients naive to DMARDs or with inadequate response to csDMARDs and bDMARDs. Filgotinib is administered orally at 200 mg every day. For patients older than 75 years or with moderate to severe renal impairment, a dose of filgotinib 100 mg every day is recommended.


Asunto(s)
Antirreumáticos , Artritis Reumatoide , Antirreumáticos/efectos adversos , Artritis Reumatoide/tratamiento farmacológico , Humanos , Piridinas/uso terapéutico , Triazoles/uso terapéutico
12.
Reumatismo ; 62(3): 221-4, 2010.
Artículo en Italiano | MEDLINE | ID: mdl-21052570

RESUMEN

Over the last ten years, the treatment of seronegative spondyloarthropathies has changed dramatically with the introduction of the anti-tumor necrosis factor alpha (TNFα) agents. Nevertheless, there is a growing number of studies describing several adverse reactions in patients treated with biological agents. In the present report we describe the case of a 22-year-old male patient with ankylosing spondylitis who developed a "paradoxic" adverse reaction, while receiving infliximab.


Asunto(s)
Anticuerpos Monoclonales/efectos adversos , Artritis/inducido químicamente , Inmunosupresores/efectos adversos , Espondilitis Anquilosante/tratamiento farmacológico , Factor de Necrosis Tumoral alfa/antagonistas & inhibidores , Anticuerpos Monoclonales/uso terapéutico , Artritis/sangre , Fiebre/inducido químicamente , Humanos , Inmunosupresores/administración & dosificación , Inmunosupresores/uso terapéutico , Infliximab , Masculino , Metotrexato/administración & dosificación , Metotrexato/uso terapéutico , Espondilitis Anquilosante/sangre , Adulto Joven
13.
Reumatismo ; 61(4): 309-15, 2009.
Artículo en Italiano | MEDLINE | ID: mdl-20143008

RESUMEN

There is a growing number of papers investigating the diagnostic potential of ultrasonography in the assessment of patients with psoriatic arthritis and supporting its higher sensitivity over clinical examination in the diagnosis of synovitis, enthesitis and tenosynovitis. Less attention has been paid on both skin and nail, frequently involved in this condition. The aim of this paper is to show the potential of ultrasound in a multi-target assessment (joints, tendons, entesis, skin and nails) in patients with psoriatic arthritis, using the last generation ultrasound equipment.


Asunto(s)
Artritis Psoriásica/diagnóstico por imagen , Humanos , Articulaciones/diagnóstico por imagen , Ligamentos Articulares/diagnóstico por imagen , Uñas/diagnóstico por imagen , Piel/diagnóstico por imagen , Tendones/diagnóstico por imagen , Ultrasonografía
14.
Reumatismo (Milano) ; 72(1): [1-15], 2020.
Artículo en Inglés | BIGG | ID: biblio-1117229

RESUMEN

To provide evidence-based up-to-date recommendations for the management of patients with a defi-nite diagnosis of polymyalgia rheumatica (PMR).Methods: A systematic literature review was performed to find the existing clinical practice guidelines (CPGs) on PMR and the framework of the Guidelines International Network Adaptation Working Group was used to appraise (AGREE II), synthesize, and customize the recommendations according to the needs of the Italian healthcare context. Rheumatologists on behalf of the Italian Society of Rheumatology (SIR) and from the SIR Epidemiology Unit joined the working group and identified the key health questions on PMR to guide the systematic literature review. Physicians, including general practitioners and specialists, and health profession-als who manage PMR in the clinical practice were the target audience. The final recommendations were rated externally by a multi-disciplinary and multi-professional group of stakeholders.Results: From the systematic search in databases (Medline, Embase) and grey literature, 3 CPGs were identi-fied and appraised by two independent raters. Combining the statements and the evidence from these CPGs, 9 recommendations were developed by endorsement or adaptation in response to the initial key health questions. The quality of evidence was graded and the working group discussed the final recommendations in view of their implementation in the Italian healthcare context. Conclusions: In absence of national guidelines so far, these recommendations are the first to provide guid-ance for the management of patients with a diagnosis of PMR in Italy and they are expected to ensure the best evidence-based clinical practice for this diseas


Asunto(s)
Humanos , Polimialgia Reumática/diagnóstico , Polimialgia Reumática/prevención & control , Polimialgia Reumática/terapia , Italia
15.
Int J Clin Pharmacol Res ; 14(1): 11-26, 1994.
Artículo en Inglés | MEDLINE | ID: mdl-7927957

RESUMEN

Three-hundred-and-fifteen patients, aged 60 or more years, affected by degenerative joint disease (DJD) in the active stage, the majority with concomitant pathological conditions of various organs and systems and undergoing various combined drug treatments, were treated with 300 mg b.i.d. etodolac in order to assay its efficacy and safety profile in an aged population more exposed to the occurrence of adverse events. In a subset of these patients, the impact of etodolac treatment on cognitive function and mood was studied. All clinical assessments revealed highly significant improvement after etodolac treatment. Significant improvement was found also for what concerns mood, whereas only the less aged patients showed improvement in cognitive abilities after treatment with etodolac. Only 30 patients (9.5%) showed side-effects, resulting in suspension of treatment in 10 cases (3.17%). In all cases, adverse reactions subsided with no consequences. Laboratory tests performed at the end of the study yielded mean values comprised within the normal range and were not statistically different from the same examinations performed before starting treatment. Occult blood in stool turned positive after treatment with etodolac only in six patients (2%). In conclusion, etodolac proved to be effective and well-tolerated in the treatment of risk-aged patients with active DJD.


Asunto(s)
Envejecimiento/efectos de los fármacos , Etodolaco/uso terapéutico , Osteoartritis/tratamiento farmacológico , Administración Oral , Afecto/efectos de los fármacos , Anciano , Anciano de 80 o más Años , Antiinflamatorios no Esteroideos/uso terapéutico , Cognición/efectos de los fármacos , Etodolaco/efectos adversos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Análisis de Regresión
16.
J Hypertens Suppl ; 6(1): S91-3, 1988 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-3063797

RESUMEN

Hypertensive emergencies, and to a certain extent their treatment, contribute to morbidity and mortality in elderly patients. We studied 22 hospitalized patients, aged 70-90 years, all of whom had moderate essential hypertensive. During acute hypertension, mean systolic and diastolic blood pressure rose to 230 +/- 24 and 120 +/- 22 mmHg, respectively. Symptoms of reduced tissue perfusion/oxygenation and/or organ failure occurred, forcing us to begin antihypertensive therapy. We administered 50 mg of the angiotensin converting enzyme (ACE) inhibitor captopril sublingually, and within 15 min, systolic blood pressure decreased by an average 60 +/- 16 mmHg and diastolic blood pressure by an average 25 +/- 14 mmHg. There was no significant change in the heart rate. In addition, we treated 22 comparable patients with 10 mg nifedipine sublingually and observed, in four cases, a greater fall in blood pressure (up to 90 mmHg) together with tachycardia. These results show the beneficial effects of captopril in the treatment of hypertensive emergencies in elderly patients. The absence of dangerous side effects indicates that ACE inhibitors can be used as first-choice drugs for the treatment of acute hypertensive crises, even in old age.


Asunto(s)
Captopril/uso terapéutico , Hipertensión/tratamiento farmacológico , Nifedipino/uso terapéutico , Administración Sublingual , Anciano , Anciano de 80 o más Años , Inhibidores de la Enzima Convertidora de Angiotensina/administración & dosificación , Inhibidores de la Enzima Convertidora de Angiotensina/uso terapéutico , Presión Sanguínea/efectos de los fármacos , Captopril/administración & dosificación , Ensayos Clínicos como Asunto , Urgencias Médicas , Femenino , Frecuencia Cardíaca/efectos de los fármacos , Humanos , Masculino , Nifedipino/administración & dosificación , Nifedipino/efectos adversos , Distribución Aleatoria , Factores de Tiempo
17.
Artículo en Inglés | WPRIM | ID: wpr-998739

RESUMEN

@#Introduction: Nurses play critical roles in disaster management and are required to demonstrate leadership by dealing with disaster events effectively. This study aimed to identify the nurse leadership indicators at each phase of disaster management. Methods: A qualitative descriptive study was conducted in two phases between November 2017 -January 2018 at two regional hospitals and one central hospital in Yogyakarta. The first phase involved semi-structured in-depth interviews with seven emergency nurses, and the second was a focus group discussions with five nurses’ managers or lecturers. Participants were selected using a purposive sampling technique. Data Analyze used a modified version framework method. Results: We found 49 indicators of nurse leadership in disaster management. We grouped indicators into two major groups: common indicators (27 indicators) and specific indicators (22 indicators). Four themes were obtained according to the disaster management phases: nurse leadership in the mitigation phase, the preparedness phase, the response phase, and the recovery/rehabilitation phase. Each theme contains three main sub-themes (3Cs): character, competence, and the central role of the leader. Conclusion: Using the International Council of Nurses (ICN) framework’s disaster phase as a conceptual basis, 49 nurse leadership indicators were identified as potential information for future items candidates of the instrument for measuring nurse leadership in disaster management.

18.
Biol Bull ; 185(3): 393-404, 1993 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-29300627

RESUMEN

We studied the mineral composition of statoliths in 154 species belonging to 55 genera of Mysidae. Fluorite (CaF2) was found in 86% of Recent species, vaterite (CaCO3) in 9%, and no crystalline component in 5%. Seven samples of fossil statoliths from Upper Miocene deposits were exclusively calcite (CaCO3). Vaterite has the peak of occurrence in fresh water, fluorite in the photic zone of marine waters, and organic statoliths in oceanic deep waters. With respect to population numbers in the different aquatic biota, vaterite prevails in freshwater species and fluorite is dominant among species in all brackish to marine environments. The occurrence of CaCO3 in fresh to brackish waters coincides with fossil records and biogeographical observations. The Ponto-Caspian region is the center of abundance for Recent CaCO3-precipitating species. The rich brackish to freshwater fauna in this region probably has its roots in the brackish Paratethys, where a rich fossil material of calcareous mysid statoliths is known from Upper Miocene sediments. Morphological and scarce palaeontological evidence suggests that the earliest (Carboniferous to Jurassic) Mysidacea were mainly oceanic shrimps without statocysts; these were followed by (bentho) pelagic animals with nonmineralic organic statoliths. With the colonization of coastal to littoral areas by benthopelagic to benthic forms, mineralic statoliths were formed by precipitation of fluorite. Among the modern Mysidae, a special development occurred (in the Miocene) in the Ponto-Caspian region where CaCO3 statoliths appeared in brackish to freshwater forms. As in vertebrates, the patterns of mineral composition of static bodies in the Mysidae reflect both anatomical and ecophysiological differences.

19.
J Morphol ; 215(1): 31-49, 1993 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-29865427

RESUMEN

Statoliths of 61 Recent species representing all subfamilies of Mysidae were studied with special emphasis on internal structure. In addition 5 samples of fossil statoliths from Miocene deposits were examined. Species of Boreomysinae and Rhopalophthalminae show simple roughly spherical organic statoliths, with setae originating from the sensory cushion and anchored in the statolith with distal branches extending shortly below the surface. All other subfamilies possess mineralized statoliths of greater structural complexity, with differentiation in core and mantle, where each part may consist of up to three layers. Habitus is hemispherical to discoidal. External gross structures are dorsal tegmen, ventral fundus, and the ambitus forming the outer toroidal to semi-toroidal circumference. Setae penetrate the mantle through mineralic canals and insert on the surface of the core. As suggested by congeneric species of Schistomysis, there is no principal structural difference between statoliths mineralized with fluorite compared to vaterite. However, vaterite statoliths tend to be more often of moruloid appearance and are exceptional by showing a central conical hole (the hilum) or a central cavity in certain forms. These structures are typical of fossil calcite statoliths. In vaterite and fluorite statoliths, the mantle shows radially arranged (= spherulitic) crystal aggregates. Such arrangements are badly preserved in fossil calcite statoliths. In large extant statoliths, concentric structures, mainly in the form of superficial striation and/or concentric microstrata, are visible in coexistence with radial aggregates. Stratification is possibly due to stratified deposition of the nonmineralized gland product, while the spherulitic structure is indicative of subsequent radial growth of crystal aggregates. The structure of accessory fluorite statoliths in the statocyst of Mesopodopsis slabberi leads to the hypothesis that mantle material is formed by secretions of the caudal statocyst gland. After demineralization of fluorite, vaterite and calcite statoliths, an organic template remains showing most essential morphological features of the statolith. From this we conclude that the structure of the statolith is (almost) entirely matrix mediated. © 1993 Wiley-Liss, Inc.

20.
Cell Mol Biol (Noisy-le-grand) ; 38(8): 877-84, 1992 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-1477604

RESUMEN

The behaviour of sodium transport systems across the cell membrane has been poorly investigated in elderly hypertension. Sodium efflux driven by Na+/K+/Cl-cotransport activity was therefore investigated (using a novel NMR-spectroscopy method) in 5 elderly hypertensive males (mean age 78 +/- 5 years) and 5 normotensive controls (mean age 79 +/- 3 years). In order to exclude any change in cotransport activity secondary to metabolic abnormalities, both patients and controls were non-obese and had normal glucose and lipid metabolisms. The Na+/K+/Cl-cotransport evaluation was performed after three months of pharmacological wash-out, under a diet containing 120 mEq of Na+/day. The resulting data showed that Na+ efflux due to outward Na+/K+/Cl-cotransport was higher in hypertensive group than in the normotensive one (0.50 +/- 0.10 mmol Na+/l cells/hr. vs 0.33 +/- 0.03 mmol Na+/l cells/hr., respectively, p < 0.05). Intracellular Na+ content was similar in both groups. At variance with previous data from the literature, our findings indicate that the Na+/K+/Cl-cotransport activity is elevated in elderly hypertensives.


Asunto(s)
Proteínas Portadoras/sangre , Eritrocitos/metabolismo , Hipertensión/sangre , Sodio/sangre , Anciano , Aldosterona/sangre , Presión Sanguínea , Colesterol/sangre , Creatinina/sangre , Humanos , Insulina/sangre , Cinética , Espectroscopía de Resonancia Magnética/métodos , Masculino , Valores de Referencia , Renina/sangre , Simportadores de Cloruro de Sodio-Potasio , Triglicéridos/sangre
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