ABSTRACT
Objetivo: Determinar la exactitud y el comportamiento de las retinografías realizadas en atención primaria como herramienta de diagnóstico precoz del glaucoma crónico (GAA) en población con factores de riesgo. Diseño: Estudio observacional, descriptivo y transversal con 2 observadores en paralelo de forma ciega: 2 médicos de atención primaria (MAP) y un oftalmólogo de atención especializada Emplazamiento: Centro de atención primaria urbano, consultas externas del servicio de oftalmología (hospitalario). Participantes: Ciento noventa y seis pacientes de ambos sexos, entre 40-70 años, diabéticos, hipertensos, no diagnosticados de glaucoma, captados mediante llamada telefónica tras revisión de listados de pacientes. Dos de los pacientes no acudieron a las citaciones para las pruebas oftalmológicas, considerándose como pérdidas. Mediciones: Para la variable cuantitativa diagnóstico de glaucoma por retinografía: exactitud calculada por la sensibilidad y especificidad, comportamiento por los valores predictivos positivo y negativo, cociente de probabilidad positivo y negativo, concordancia interobservador por índices kappa y cociente de correlación intraclase (CCI). Resultados: Se obtuvo una sensibilidad del 21% (IC 95%: 0-43%), especificidad del 93% (IC 95%: 89-97%), valor predictivo negativo del 94% (IC 95%: 90-97%) y positivo del 20% (IC 95%: 0-40%); cociente de probabilidad positivo de 3,07 (IC 95%: 0,98-9,62) y negativo de 0,84 (IC 95%: 0,64-1,11). El CCI fue de 0,653 (IC 95%: 0,495-0,769), y el índice kappa, de 0,140 (ET: 0,106). Conclusiones: La retinografía no presenta un comportamiento adecuado como herramienta de diagnóstico precoz de GAA desde atención primaria según el modelo planteado en nuestro estudio. Serían necesarios ajustes que subsanasen su baja sensibilidad, como usar otras pruebas combinadas y mejorar el entrenamiento de los MAP (AU)
Objective: The aim of this study is to determine usefulness, validity of retinographies performed in Primary Care as a tool for early diagnosis of open-angle chronic glaucoma (OAG). Design: An observational, descriptive and cross-sectional study with two blinded parallel observers: 2 general practitioners and 1 ophthalmologist. Location: Urban Primary Care Health Centre, and the Ophthalmology Department outpatient clinic. Participants: A total of 196 patients of both genders, between 40-70 years, with diabetes and hypertension, and undiagnosed with glaucoma, were recruited by phone call after checking patient lists. Two patients that did not arrive for their appointments for the ophthalmology tests were considered as losses. Measurements: For the quantitative diagnostic variable of glaucoma: Accuracy calculated from the sensitivity and specificity, safety from the positive and negative predictive values and the positive and negative probability ratio; interobserver concordance by Kappa index ratio and the intraclass correlation (IC). Results: The retinography for OAG screening has a sensitivity of 21% (95% CI: 0-43%), a specificity of 93% (95% CI: 89-97%), a negative predictive value of 94% (95% CI: 90-97%), and positive of 20% (95% CI: 0-40%); positive probability ratio of 3.07 (95% CI: 0.98-9.62) and negative 0.84 (95% CI: 0.64-1.11). The IC was 0.653 (95% CI: 0.495-0.769) and kappa index of 0.140 (0.106 ET). Conclusions: According to this proposed model, retinography is not a useful tool for the early diagnosis of OAG in Primary Care, as it is not safe enough. Before it can be used, it would need adjustments for its low sensitivity, and the use other combined tests. The training of general practitioners would also need to be improved (AU)
Subject(s)
Humans , Male , Female , Middle Aged , Glaucoma, Open-Angle/prevention & control , Retina , Mass Screening/methods , Risk Factors , Primary Health Care/methods , Early Diagnosis , Cross-Sectional Studies , Sensitivity and SpecificityABSTRACT
OBJECTIVE: The aim of this study is to determine usefulness, validity of retinographies performed in Primary Care as a tool for early diagnosis of open-angle chronic glaucoma (OAG). DESIGN: An observational, descriptive and cross-sectional study with two blinded parallel observers: 2 general practitioners and 1 ophthalmologist. LOCATION: Urban Primary Care Health Centre, and the Ophthalmology Department outpatient clinic. PARTICIPANTS: A total of 196 patients of both genders, between 40-70years, with diabetes and hypertension, and undiagnosed with glaucoma, were recruited by phone call after checking patient lists. Two patients that did not arrive for their appointments for the ophthalmology tests were considered as losses. MEASUREMENTS: For the quantitative diagnostic variable of glaucoma: Accuracy calculated from the sensitivity and specificity, safety from the positive and negative predictive values and the positive and negative probability ratio; interobserver concordance by Kappa index ratio and the intraclass correlation (IC). RESULTS: The retinography for OAG screening has a sensitivity of 21% (95%CI: 0-43%), a specificity of 93% (95%CI: 89-97%), a negative predictive value of 94% (95%CI: 90-97%), and positive of 20% (95%CI: 0-40%); positive probability ratio of 3.07 (95%CI: 0.98-9.62) and negative 0.84 (95%CI: 0.64-1.11). The IC was 0.653 (95%CI: 0.495-0.769) and kappa index of 0.140 (0.106ET). CONCLUSIONS: According to this proposed model, retinography is not a useful tool for the early diagnosis of OAG in Primary Care, as it is not safe enough. Before it can be used, it would need adjustments for its low sensitivity, and the use other combined tests. The training of general practitioners would also need to be improved.
