Poligrafía domiciliaria: ¿Es una técnica válida para el diagnóstico del síndrome de apneas obstructivas del sueño?

BACKGROUND: Polygraphy is an alternative diagnoses technique in the sleep apnea syndrome (SAS), although is infrequent to perform the studies at patients home. This study aims to compare the diagnoses validity of home polygraphy with conventional polysomnography in patients with moderate and high clinical suspicion of SAS, as well as valorating the grade of satisfaction. PATIENTS AND METHODS: On a selected sample, a randomized blinded study was performed analizing the degree of satisfaction of the patient by an analogic visual scale and the diagnostic validity of home polygraphy versus standard polysomnography comparing the apnea hypopnea index (AHI) obtained from both tests. RESULTS: Thirty four patients are studied (25 men and 8 women), middle age ( }SD) of 53,4 } 11 years old and a body mass index of 33 } 5 kg/m2. For an AHI .10 obtained after polysomnography, polygraphy represents a sensitivity of 90,3%, especificity of 50%, a positive predictive value of 96,5% and a negative predictive value of 25%, finding an area under the ROC curve of 0,863. In a severe SAS (AHI.30) polygraphy obtains a sensitivity of 88,2% (72,9-100) and a especificity of 100% with an area under the ROC curve of 1. AHI obtained after polygraphy compared with polysomnography (33,70 }22,38 and 36,36 }22,09 respectively) shows a high correlation with a value of r:0,975 (p