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Vol. 39. Issue 12.
Pages 537-543 (December 2003)
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Vol. 39. Issue 12.
Pages 537-543 (December 2003)
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Estudio de la validez de un equipo de poligrafía respiratoria (BREAS SC–20) para el diagnóstico del síndrome de apneas-hipopneas durante el sueño
Validation Study of a Polygraphic Screening Device (BREAS SC20) in the Diagnosis of Sleep Apnea-Hypopnea Syndrome
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R. Núñeza, J. Rey de Castroa, E. Socarrása, J.M. Callejaa, R. Rubioa, F. Aizpurub, J. Durán-Cantollaa,
Corresponding author
joaquin.duran@wanadoo.es

Correspondencia: Unidad Respiratoria de Trastornos del Sueño. Servicio Respiratorio. Hospital Txagorritxu. José Achotegui, s/n. 01009 Vitoria-Gasteiz. Álava. España
a Unidad de Sueño. Servicio de Neumología. Hospital Txagorritxu. Vitoria-Gasteiz. Álava
b Unidad de Investigación. Hospital Txagorritxu. Vitoria-Gasteiz. Álava. España
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Objetivo

Validar el polígrafo respiratorio (PR) (BREAS SC-20; Breas Medical S.L., Mölnlyke, Suecia), frente a la polisomnografía convencional (PSG), para el diagnóstico del síndrome de apneashipopneas durante el sueño. Para ello se diseñó un estudio de validez de dicha prueba diagnóstica en una unidad de sueño de un hospital terciario.

Pacientes y Métodos

Se incluyó en el estudio a 70 pacientes consecutivos con sospecha clínica de síndrome de apneas-hipopneas atendidos en el laboratorio de sueño del Hospital Txagorritxu de Vitoria desde noviembre de 2001 hasta agosto de 2002. Se determinaron parámetros antropométricos, la comorbilidad y la escala de Epworth. El índice de apneas-hipopneas (IAH) por hora de sueño se determinó por PSG, y el índice de episodios respiratorios por hora de registro (IER) mediante poligrafía respiratoria.

Resultados

Resultaron válidos 60 estudios (un 77% de los pacientes eran varones; edad media ± desviación estándar: 51,6 ± 13,2; índice de masa corporal: 30,3 ± 5; IAH: 31,0 ± 27,6). El coeficiente de correlación intraclase fue de 0,92 entre el IAH por PSG y el IER manual. La media global de las diferencias del IAH-IER manual fue de 2,92 ± 9,75. El área bajo la curva ROC fue, para el punto de corte de IAH=5, de 0,924. El mejor punto de corte para un IAH=5 fue 3,6 en el IER (sensibilidad del 98%). La poligrafía respiratoria clasificó correctamente al 90-95% de los pacientes.

Conclusiones

El BREAS SC-20 es un sistema válido para la identificación de pacientes con sospecha clínica de síndrome de apneas-hipopneas durante el sueño.

Palabras clave:
Apnea del sueño
Métodos diagnósticos
Validación
Estudios simplificados
Objective

To validate the BREAS SC20 (Breas Medical AB, Mölnlyke, Sweden) polygraphic screening device, comparing it with conventional polysomnography (PSG), in the diagnosis of sleep apnea-hypopnea syndrome. A validity study of the diagnostic test was carried out at the sleep clinic of a tertiary hospital.

Patients and Methods

Seventy patients clinically suspected of sleep apnea-hypopnea syndrome and treated at the sleep laboratory of the Hospital Txagorritxu, Vitoria, Spain, from November, 2001 until August, 2002 were consecutively enrolled in the study. Patient characteristics, comorbidities, and results on the Epworth sleepiness scale were recorded. The apnea-hypopnea index (AHI) per hour of sleep was determined by PSG; the respiratory events index (REI) per hour of screening was determined by the polygraphic screening device.

Results

Sixty studies were valid (77% were men; mean [SD] age: 51.6 [13.2]; body mass index: 30.3 [5]; AHI: 31.0 [27.6]). The intraclass correlation coefficient between the AHI by PSG and the manual REI was 0.92. The mean difference between the AHI and the manual REI was 2.92 (9.75). The area under the receiver operating characteristic curve was 0.924 for the cut point AHI = 5. The optimal cut point for an AHI = 5 was 3.6 in the REI (98% sensitivity). The respiratory screening device correctly classified 90% to 95% of the patients.

Conclusions

The BREAS SC20 is a valid system for identifying patients clinically suspected of sleep apnea-hypopnea syndrome.

Keywords:
Sleep apnea
Diagnostic methods
Validation
Simplified studies
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