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2.
JAMA ; 311(18): 1889-900, 2014 May 14.
Artículo en Inglés | MEDLINE | ID: mdl-24825644

RESUMEN

IMPORTANCE: Alcohol use disorders cause substantial morbidity and early mortality yet remain greatly undertreated. Medications are considerably underused. OBJECTIVE: To conduct a systematic review and meta-analysis of the benefits and harms of medications (US FDA-approved and others) for adults with alcohol use disorders. DATA SOURCES: PubMed, Cochrane Library, PsycINFO, CINAHL, EMBASE, FDA website, and clinical trials registries (January 1, 1970, to March 1, 2014). STUDY SELECTION: Two reviewers selected randomized clinical trials (RCTs) with at least 12 weeks' duration that reported eligible outcomes and head-to-head prospective cohort studies reporting health outcomes or harms. DATA EXTRACTION AND SYNTHESIS: We conducted meta-analyses using random-effects models and calculated numbers needed to treat for benefit (NNTs) or harm (NNHs). MAIN OUTCOMES AND MEASURES: Alcohol consumption, motor vehicle crashes, injuries, quality of life, function, mortality, and harms. RESULTS: We included 122 RCTs and 1 cohort study (total 22,803 participants). Most assessed acamprosate (27 studies, n = 7519), naltrexone (53 studies, n = 9140), or both. The NNT to prevent return to any drinking for acamprosate was 12 (95% CI, 8 to 26; risk difference [RD], -0.09; 95% CI, -0.14 to -0.04) and was 20 (95% CI, 11 to 500; RD, -0.05; 95% CI, -0.10 to -0.002) for oral naltrexone (50 mg/d). The NNT to prevent return to heavy drinking was 12 (95% CI, 8 to 26; RD -0.09; 95% CI, -0.13 to -0.04) for oral naltrexone (50 mg/d). Meta-analyses of trials comparing acamprosate to naltrexone found no statistically significant difference between them for return to any drinking (RD, 0.02; 95% CI, -0.03 to 0.08) or heavy drinking (RD, 0.01; 95% CI, -0.05 to 0.06). For injectable naltrexone, meta-analyses found no association with return to any drinking (RD, -0.04; 95% CI, -0.10 to 0.03) or heavy drinking (RD, -0.01; 95% CI, -0.14 to 0.13) but found an association with reduction in heavy drinking days (weighted mean difference [WMD], -4.6%; 95% CI, -8.5% to -0.56%). Among medications used off-label, moderate evidence supports an association with improvement in some consumption outcomes for nalmefene (heavy drinking days per month: WMD, -2.0; 95% CI, -3.0 to -1.0; drinks per drinking day: WMD, -1.02; 95% CI, -1.77 to -0.28) and topiramate (% heavy drinking days: WMD, -9.0%; 95% CI, -15.3% to -2.7%; drinks per drinking day: WMD, -1.0; 95% CI, -1.6 to -0.48). For naltrexone and nalmefene, NNHs for withdrawal from trials due to adverse events were 48 (95% CI, 30 to 112) and 12 (95% CI, 7 to 50), respectively; risk was not significantly increased for acamprosate or topiramate. CONCLUSIONS AND RELEVANCE: Both acamprosate and oral naltrexone were associated with reduction in return to drinking. When directly compared with one another, no significant differences were found between acamprosate and naltrexone for controlling alcohol consumption. Factors such as dosing frequency, potential adverse events, and availability of treatments may guide medication choice.


Asunto(s)
Trastornos Relacionados con Alcohol/tratamiento farmacológico , Acamprosato , Fructosa/efectos adversos , Fructosa/análogos & derivados , Fructosa/uso terapéutico , Reducción del Daño , Humanos , Naltrexona/efectos adversos , Naltrexona/análogos & derivados , Naltrexona/uso terapéutico , Pacientes Ambulatorios , Ensayos Clínicos Controlados Aleatorios como Asunto , Taurina/efectos adversos , Taurina/análogos & derivados , Taurina/uso terapéutico , Topiramato
3.
J Crohns Colitis ; 7(9): e344-50, 2013 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-23453888

RESUMEN

BACKGROUND AND AIMS: This study aimed to characterize the relationships between illness perceptions, body image and self-consciousness, sexual health (sexual problems and sexual satisfaction), anxiety and depression, and marital and family functioning in patients with IBD. METHODS: Seventy-four IBD patients (44 CD, 13 males, 61 females, mean age 38 years) completed an online questionnaire. Illness perceptions explored with the Brief Illness Perceptions Questionnaire, and anxiety and depression measured using the Hospital Anxiety and Depression Scale, Sexual Problems Scale, Sexual Satisfaction Scale, Marital Functioning Scale, Family Functioning Scale, and Body Image and Self-Consciousness During Intimacy Scale. RESULTS: Exploratory Structural Equation Modeling (SEM) provided a final model with an excellent fit (χ(2) (25)=27.84, p=.32, χ(2)/N=1.11, CFI>0.99, RMSEA<0.04, SRMR<0.07, GFI>0.93). Illness perceptions had a significant direct influence on depression (ß=0.49, p<0.001), anxiety (ß=0.55, p<0.001), and family functioning (ß=-0.17, p<0.001). Several mediating pathways were also found involving sexual problems, sexual satisfaction, and body image and self-consciousness during intimacy. Being female was associated with increased sexual problems but increased sexual satisfaction. CONCLUSIONS: The findings provide further evidence for the adverse impact of patient IBD-related illness perceptions on anxiety and depression. The findings also provide the preliminary evidence for the impact of illness perceptions and psychological comorbidity in relation to sexual health and relationship and family functioning. These aspects of psychological processing provide a framework and direction for further research into the nature of IBD and its influence on the patient and their family.


Asunto(s)
Imagen Corporal/psicología , Enfermedades Inflamatorias del Intestino/psicología , Relaciones Interpersonales , Autoimagen , Sexualidad , Adulto , Ansiedad/complicaciones , Ansiedad/psicología , Depresión/complicaciones , Depresión/psicología , Disfunción Eréctil/complicaciones , Disfunción Eréctil/psicología , Femenino , Humanos , Enfermedades Inflamatorias del Intestino/complicaciones , Masculino , Modelos Psicológicos , Percepción , Escalas de Valoración Psiquiátrica , Factores Sexuales , Encuestas y Cuestionarios
6.
Ophthalmologe ; 103(6): 501-5, 2006 Jun.
Artículo en Alemán | MEDLINE | ID: mdl-16763867

RESUMEN

PURPOSE: This study reports on the long-term results of macular hole surgery with peeling of the ILM. METHODS: A total of 88 consecutive patients (71 female, 17 male, mean age 67 years) were prospectively evaluated. All patients underwent a standard pars plana vitrectomy with removal of the ILM and an intraocular gas tamponade. Preoperatively, as well as on each follow-up visit, a clinical examination including measurement of best corrected visual acuity, Goldman perimetry, and OCT was performed. RESULTS: The mean postoperative follow-up was 49 months; 83 (94%) patients were pseudophakic at the last examination. Anatomic closure was achieved in 84 (95%) patients. No late reopening of the macular hole was observed. Best corrected visual acuity improved in 82 patients (93%), remained unchanged in 2, and deteriorated in 4 patients. Best corrected visual acuity improved from a median of 0.2 preoperatively to a median of 0.6 postoperatively (p<0.001). Duration of symptoms as well as low preoperative visual acuity had no significant impact on anatomic and functional success. CONCLUSIONS: Macular hole surgery leads to good functional and anatomical results, even in the long term. A long history of visual impairment and low visual acuity before surgery are not contraindications to surgical intervention.


Asunto(s)
Perforaciones de la Retina/cirugía , Trastornos de la Visión/prevención & control , Vitrectomía , Anciano , Femenino , Humanos , Estudios Longitudinales , Masculino , Estudios Prospectivos , Recuperación de la Función , Perforaciones de la Retina/complicaciones , Resultado del Tratamiento , Trastornos de la Visión/etiología
10.
Artículo en Inglés | MEDLINE | ID: mdl-12208304

RESUMEN

Because of their small size and expensive mode of flight, hummingbirds display some of the highest known mass-specific rates of aerobic metabolism among vertebrates. High enzymatic flux capacities through pathways of carbohydrate and long-chain fatty acid oxidation indicate that either substrate can fuel flight. Although hummingbirds are known to rely on fat to fuel migratory flight, short foraging bouts are fueled by the oxidation of carbohydrate, not fat. This allows birds refueling at meadows during migration to deposit fat at higher rates and avoids the energetic inefficiency that results from synthesizing fat from dietary sugar, and then breaking down the fat to fuel foraging flight. On cold mornings in subalpine meadows, refueling hummingbirds achieve net energy gain despite the high energetic costs of thermoregulation and flight. In doing so, they sustain the highest known time-averaged metabolic rates among vertebrates. However, low sucrose concentrations, provided in volumes large enough to allow the maintenance of energy balance at low temperature, result in energy deficit and mass loss. The problem of disposing of dietary water at low ambient temperature when intake rates are elevated suggests that the kidneys may be involved in establishing the upper limit to intake rates and, therefore, maximum sustained metabolic rates. It is suggested that hummingbird behaviour and metabolism have coevolved to maximize net energy gain. Further, the energetics of hummingbird thermoregulation and flight may have influenced the evolution of sucrose content in floral nectar.


Asunto(s)
Aves/fisiología , Animales , Conducta Animal , Regulación de la Temperatura Corporal/fisiología , Dieta , Metabolismo Energético , Conducta Alimentaria , Vuelo Animal/fisiología , Músculos/fisiología
11.
Br J Ophthalmol ; 86(4): 390-3, 2002 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-11914205

RESUMEN

BACKGROUND/AIM: In 1991 there was a series of successful closures of a macular hole after vitrectomy and membrane peeling. Today this technique has become a standard procedure. The aim of this study was to evaluate the role of optical coherence tomography in diagnosing and staging, as well as in predicting, the functional and anatomical outcome after macular hole surgery. METHOD: In a prospective study 94 consecutive patients (20 male, 74 female) with a mean age of 67.6 (SD 6.0) years and a macular hole stage II (n = 8), III (n = 72), and IV (n = 14) according to the classification by Gass were examined with optical coherence tomography (OCT) before pars plana vitrectomy. Macular hole diameters were determined at the level of the retinal pigment epithelium (base diameter) and at the minimal extent of the hole (minimum diameter). Calculated hole form factor (HFF) was correlated with the postoperative anatomical success rate and best corrected visual acuity. The duration of symptoms was correlated with base and minimum diameter of the macular hole. RESULTS: In eyes without anatomical closure of the macular hole after one surgical approach (13/94) the base diameter (p1) and the minimum diameter (p2) were significantly larger than in cases with immediate postsurgical closure (p1 = 0.003; p2 = 0.028). There was a significant negative correlation between both the base and the minimum diameter of the hole and the postoperative visual function (p1 = 0.016; p2 = 0.002). In all patients with HFF >0.9 the macular hole was closed following one surgical procedure, whereas in eyes with HFF <0.5 anatomical success rate was 67%. Better postoperative visual outcome correlated with higher HFF (p = 0.050). There was no significant correlation between the duration of symptoms and base or minimum diameters (p1 = 0.053; p2 = 0.164), respectively. CONCLUSION: Preoperative measurement of macular hole size with OCT can provide a prognostic factor for postoperative visual outcome and anatomical success rate of macular hole surgery. The duration of symptoms did not correlate with the diameters measured. Base and minimum diameters especially seem to be of predictive value in macular hole surgery.


Asunto(s)
Perforaciones de la Retina/cirugía , Anciano , Anciano de 80 o más Años , Femenino , Estudios de Seguimiento , Humanos , Masculino , Persona de Mediana Edad , Cuidados Preoperatorios/métodos , Pronóstico , Estudios Prospectivos , Perforaciones de la Retina/patología , Perforaciones de la Retina/fisiopatología , Tomografía/métodos , Agudeza Visual , Vitrectomía/métodos
12.
Ophthalmologe ; 98(11): 1060-4, 2001 Nov.
Artículo en Alemán | MEDLINE | ID: mdl-11729737

RESUMEN

BACKGROUND: The aim of our study was a detailed morphological and functional assessment of macular foramen stages II-IV by scanning laser ophthalmoscopy (SLO) and fundus perimetry including a correlation with clinical findings. METHODS AND MATERIALS: Included in this prospective study were 78 patients where SLO imaging and fundus perimetry were performed with the SLO-105 (Rodenstock) prior to pars plana vitrectomy for macular foramen on one eye. Both the size and shape the of macular foramen were assessed. Deep (0 dB) and relative (12 dB) scotomata were tested using the Goldmann II stimulus in the 20 degrees field of the SLO. Imaging was performed with the infrared laser and confocal aperture C2. RESULTS: The size of macular foramen ranged from 140 microns to 800 microns (median: 420 microns) and 20 (26%) had irregular, polycyclic borders. In 21 patients (27%) a bright sector could be seen just outside the hole. Deep scotomata were notably smaller than the visible macular hole in 4 patients (6%) and 18 deep scotomata (25%) extended beyond the hole. There was a weak inverse correlation between the size of deep, relative scotomata and the diameter of the macular holes with the visual acuity (r = -0.46; r = -0.39 or r = -0.53), but no correlation with the duration of symptoms could be demonstrated. CONCLUSION: Polycyclic borders were seen as a new feature of some idiopathic macular foramen. This may be due to asymmetric traction or adhesions on the macular area. Also, deep scotomata either smaller or larger than the visible macular hole were found.


Asunto(s)
Oftalmoscopios , Perforaciones de la Retina/diagnóstico , Anciano , Anciano de 80 o más Años , Fondo de Ojo , Humanos , Rayos Láser , Persona de Mediana Edad , Pronóstico , Estudios Prospectivos , Perforaciones de la Retina/cirugía , Escotoma/diagnóstico , Agudeza Visual , Pruebas del Campo Visual , Vitrectomía
13.
Am J Ophthalmol ; 132(3): 363-8, 2001 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-11530049

RESUMEN

PURPOSE: To report the incidence of macular changes following pars plana vitrectomy with peeling of the internal limiting membrane (ILM) for idiopathic macular hole. DESIGN: Prospective consecutive series. METHODS: In a prospective study 105 eyes of 105 patients underwent vitrectomy for idiopathic macular holes. Surgery consisted of a standard three-port vitrectomy, induction of a posterior hyaloid detachment, removal of epiretinal membranes including the ILM, fluid-air exchange and intraocular gas tamponade (15% hexafluoroethane (C2F6) gas mixture) followed by head-down positioning for at least five days. No adjuvants were used during surgery. In addition to the clinical examination, static microperimetry using a Rodenstock scanning laser ophthalmoscope (SLO-105) was performed pre- and 6 or 12 weeks postoperatively. The stimulus size was 0.2 degrees (Goldmann II), intensities employed were 0 and 12 dB. For all tests, 20-degree fields were used. RESULTS: Anatomic closure of macular holes was achieved in 92 (87.6%) of 105 patients by one operation. Eight patients underwent a successful second procedure. The closure rate after two operations was 95.2%. Best corrected visual acuity increased from a median of 0.2 (range 0.05 to 0.5) preoperatively to a median of 0.5 (range 0.05 to 1.0) postoperatively. Anatomical macular changes were found in 8 (7.6%) patients: There were two cases of macular edema following secondary cataract extraction and six cases of retinal pigment epithelium changes. Formation of postoperative epiretinal membranes or late reopenings were not noted. Small, mostly asymptomatic paracentral scotomata were seen in 59 (56.2%) of 105 patients. CONCLUSION: Anatomical changes of the macula following vitrectomy with removal of the ILM are infrequent. However, paracentral scotomata observed in our series might be caused by a trauma to the nerve fibers during ILM peeling. To achieve reliable results a standardized procedure for microperimetry should be developed.


Asunto(s)
Catarata/etiología , Membrana Epirretinal/cirugía , Mácula Lútea/patología , Edema Macular/etiología , Perforaciones de la Retina/cirugía , Escotoma/etiología , Vitrectomía/efectos adversos , Anciano , Anciano de 80 o más Años , Membrana Basal/cirugía , Catarata/terapia , Femenino , Humanos , Edema Macular/cirugía , Masculino , Persona de Mediana Edad , Procedimientos Quirúrgicos Oftalmológicos , Estudios Prospectivos , Escotoma/cirugía , Agudeza Visual
14.
Am J Ophthalmol ; 132(3): 431-3, 2001 Sep.
Artículo en Inglés | MEDLINE | ID: mdl-11530071

RESUMEN

PURPOSE: To demonstrate possible retinal damage caused by indocyanine green dye for staining of the internal limiting membrane in surgery for idiopathic macular hole. METHODS: Consecutive interventional case series. We report on the ultrastructural findings of the internal limiting membrane in 10 eyes of 10 patients. RESULTS: All specimens revealed not only the internal limiting membrane, but also some small amounts of retinal elements, such as the plasma membrane of Müller cells and other undetermined structures. This indicates a cleavage plane not exactly at the inner undulating aspect of the internal limiting membrane but within the innermost retinal layers. CONCLUSION: Dilutions of indocyanine green as recommended in the literature may alter the structure of the retina to some degree. Possible factors responsible for this inadvertent action may include (1) concentration, (2) osmolarity pH, (3) time of tissue contact, and (4) mechanical factors from more forceful traction during peeling. Although functional consequences of these findings remain unclear as yet, factors that may induce damage to the innermost retina should be elucidated.


Asunto(s)
Colorantes/administración & dosificación , Membrana Epirretinal/cirugía , Lesiones Oculares/etiología , Verde de Indocianina/administración & dosificación , Retina/lesiones , Membrana Basal/cirugía , Membrana Basal/ultraestructura , Membrana Epirretinal/patología , Lesiones Oculares/patología , Humanos , Retina/ultraestructura , Perforaciones de la Retina/cirugía , Rotura , Coloración y Etiquetado/métodos
15.
Assessment ; 8(2): 213-9, 2001 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-11428700

RESUMEN

A 180-item short form of the MMPI-2 (MMPI-2-180) was recently developed by Dahlstrom and Archer and has been proposed for clinical use under special circumstances. This study investigated the psychometric characteristics of the MMPI-2-180 in order to delineate its strengths, limitations, and appropriate scope of clinical application. Using a neuropsychological referral sample (N = 205), we examined accuracy of the short-form as it pertains to the following (a) the prediction of basic scale scores and profile code types, (b) the identification of high-point scales, and (c) the classification of scores as pathological (T > or = 65) or normal range. The results indicate that the MMPI-2-180 provides an unreliable basis for predicting clinical code types, identifying the high-point scale, or predicting the scores on most of the basic scales. In contrast, scores on the MMPI-2-180 are accurate predictors of whether the full-scale scores fall within the pathological range (T > or = 65). These findings suggest that (a) standard interpretive procedures involving profile configuration should not be used, in most cases, with the 180-item short-form results, (b) properly interpreted, this shortened version provides potentially useful information regarding the probable presence of various problem areas, and (c) this information is very limited when contrasted with that obtained using the complete or abbreviated (i.e., 370 item) version of the MMPI-2.


Asunto(s)
Lesiones Encefálicas , MMPI , Determinación de la Personalidad , Psicometría , Adulto , Anciano , Anciano de 80 o más Años , Humanos , Masculino , Persona de Mediana Edad , Neuropsicología
16.
Br J Ophthalmol ; 85(5): 549-51, 2001 May.
Artículo en Inglés | MEDLINE | ID: mdl-11316714

RESUMEN

AIM: To prospectively evaluate peripheral visual fields after vitrectomy for idiopathic macular holes. METHODS: Goldmann perimetry was performed in 105 patients before, as well as 6 weeks and 12 months after macular hole surgery. RESULTS: Only one patient (< 1%) with a stage III macular hole developed an asymptomatic postoperative visual field defect. The scotoma was wedge-shaped, peripherally located in the temporal quadrant, and remained unchanged during the following 12 months. CONCLUSION: Peripheral visual field defects after macular hole surgery can be a complication of very low incidence. A rather low pressure set during air-fluid exchange as well as special aspects of the surgical technique may be responsible for this low incidence of peripheral visual field defects.


Asunto(s)
Complicaciones Posoperatorias/fisiopatología , Perforaciones de la Retina/cirugía , Campos Visuales/fisiología , Vitrectomía/métodos , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Perforaciones de la Retina/clasificación , Escotoma/etiología , Escotoma/fisiopatología , Pruebas del Campo Visual
17.
Br J Ophthalmol ; 85(2): 231-3, 2001 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-11159494

RESUMEN

AIMS: To report the occurrence of paracentral scotomata after pars plana vitrectomy for idiopathic macular holes. METHODS: In 15 patients static microperimetry using a Rodenstock scanning laser ophthalmoscope (SLO-105) was performed preoperatively and 6 or 12 weeks postoperatively (stimulus size 0.2 degrees (Goldmann II), employed intensity 0 and 12 dB, 20 degrees fields in all tests). Surgery consisted of standard three port vitrectomy including removal of epiretinal membranes and the inner limiting membrane. RESULTS: Postoperative paracentral scotomata were detected in areas that were tested normally before surgery. They were mostly located temporally and/or inferiorly and often appeared like nerve fibre bundle defects. The greatest dimension varied from 1.2 degrees to 4.0 degrees (360-1200 microm), smallest dimension from 0.25 degrees to 2.0 degrees (75-600 microm). In three patients more than one scotoma was observed. CONCLUSION: Small, mostly asymptomatic, paracentral scotomata as a complication after vitrectomy for idiopathic macular hole have not been reported in the literature so far. Whether they are caused by trauma to the nerve fibres during surgery or other factors remains unknown.


Asunto(s)
Perforaciones de la Retina/cirugía , Escotoma/etiología , Vitrectomía/efectos adversos , Anciano , Femenino , Estudios de Seguimiento , Humanos , Masculino , Persona de Mediana Edad , Oftalmoscopía/métodos , Escotoma/diagnóstico , Pruebas del Campo Visual/métodos
18.
Assessment ; 8(4): 425-9, 2001 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-11785586

RESUMEN

The F(p) scale of the MMPI-2 is widely used to help identify exaggeration of psychological problems in psychiatric, forensic, and neuropsychological settings. The scale was constructed by selecting all MMPI-2 items (N = 27) that were endorsed by less than 20% of a sample of VA psychiatric inpatients and 20% of the normative sample used in restandardizing the MMPI-2. Although F(p) is used to measure symptom exaggeration and malingering, 4 of its 27 items load on the Lie (L) scale, which is known to be a measure of defensiveness and symptom underreporting. These four items, which express a denial of occasional anger, irritability, and procrastination, could conceivably measure an uncommon expression of defensiveness. This study used 150 neuropsychological referrals to test the hypotheses that (a) the four L scale items measure defensiveness, not exaggeration, and (b) the elimination of these items improves the utility of F(p) in assessing symptom exaggeration. The results indicate that the four L scale items are associated with defensiveness, not with symptom exaggeration. One third of the patients had an average T-score artifact of 9.5 points on F(p) as a result of endorsing these L scale items, with a range of 0T to 21T. Using the K scale as a criterion for level of problem disclosure, a shortened version of F(p) (omitting the four L scale items) was superior to F(p) as a measure of symptom exaggeration (r = -.46 vs. -.36, r2 = 21% vs. 13% of the variance). The implications for clinical practice are discussed.


Asunto(s)
MMPI , Simulación de Enfermedad/diagnóstico , Trastornos de la Personalidad/diagnóstico , Adulto , Anciano , Anciano de 80 o más Años , Trastorno Depresivo Mayor/diagnóstico , Humanos , Masculino , Persona de Mediana Edad , Reproducibilidad de los Resultados , Trastornos por Estrés Postraumático/diagnóstico
19.
Gen Comp Endocrinol ; 120(2): 235-47, 2000 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-11078634

RESUMEN

The adrenocortical response to stress has been shown to be important in energy management of vertebrates. Although hummingbirds (Trochilidae) are useful models for studying energy balance, they are not amenable to traditional methods of studying hormones. In this study we report noninvasive methods for measuring and manipulating corticosterone (CORT), the principal stress glucocorticoid in birds. CORT was measured in cloacal fluid (CF) collected from unrestrained rufous hummingbirds (Selasphorus rufus). We demonstrate that CF CORT can be measured by radioimmunoassay without extraction. CF creatinine, when used as a reference measure for CF CORT, corrects for changes in hydration state. As in other birds, CORT in both plasma and CF rose in response to capture and handling stress and decreased after the termination of that stress, except that changes in CF concentration were delayed with respect to changes in plasma. When CORT, complexed with cyclodextrin to improve solubility, was added to artificial nectar, CF CORT concentrations changed in a predictable, dose-dependent fashion. Measuring CORT in CF is advantageous because it allows frequent and repeated sampling without itself provoking a detectable stress response and because baseline samples need not be obtained within the very short time between the onset of a stressor and the appearance of CORT in the plasma, as is true for blood sampling. Administration of exogenous CORT in the food offers a noninvasive, nonstressful, temporally sensitive method for experimentally manipulating hormone levels in an avian model that has already been used extensively for studies of energetics.


Asunto(s)
Aves/fisiología , Cloaca , Corticosterona/fisiología , Animales , Conducta Animal/fisiología , Peso Corporal , Corticosterona/orina , Creatinina/sangre , Ingestión de Energía , Metabolismo Energético/fisiología , Alimentos , Privación de Alimentos , Secreciones Intestinales/química , Masculino , Radioinmunoensayo/veterinaria
20.
Ophthalmologe ; 97(12): 821-6, 2000 Dec.
Artículo en Alemán | MEDLINE | ID: mdl-11227151

RESUMEN

BACKGROUND: Vitreoretinal adhesions play a crucial role in the development of a macular hole. To visualize vitreoretinal adhesion we used optical coherence tomography to investigate fellow eyes of patients with macular holes. METHODS: In a prospective study we scanned the retina in 188 patients with a macular hole stage III or IV (Gass classification). The foveal shape and vitreous were classified into grades. RESULTS: Of the 188 patients 45% showed no vitreous reflex, 45% a partial vitreous detachment with foveolar adhesions, and 10% a vitreous detachment with complete separation from the fovea. While eyes with normal foveolar shape displayed partial vitreous detachment in 33%, this figure rose to 66% in eyes with a macular hole stage I. CONCLUSION: Diffuse thickening of the fovea is followed by an intraretinal split and formation of a cyst. The shape of the foveolar adhesion suggests that continuing anteroposterior vitreal traction leads to a retinal break and formation of a full-thickness macular hole.


Asunto(s)
Retina/patología , Perforaciones de la Retina/diagnóstico , Tomografía , Cuerpo Vítreo/patología , Anciano , Femenino , Fóvea Central/patología , Humanos , Masculino , Persona de Mediana Edad , Adherencias Tisulares , Desprendimiento del Vítreo/diagnóstico
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