RESUMEN
BACKGROUND AND OBJECTIVES: Despite a confirmed association between obstructive sleep apnea (OSA) and stroke, the pathogenesis of OSA in stroke has not been hitherto clarified. The aim of this study was to evaluate the relationship between respiratory abnormalities and atherogenic pro-inflammatory markers, interleukin-1beta (IL-1ß), interleukin-6 (IL-6), and tumor necrosis factor-alpha (TNF-α) in acute ischemic stroke patients. METHODS: Nocturnal polygraphy was performed in 50 consecutive patients with acute ischemic stroke in the first week after the event. Levels of inflammatory markers (IL-6, IL-1ß and TNF-α) were determined from morning blood samples and comparatively analyzed between cases with and without severe OSA and with age-matched controls. RESULTS: All patients with acute ischemic stroke, 31 men, mean age (64.3 ± 7.7 years), had apnea-hypopnea index (AHI) > 5 and 35 (70%) had severe OSA (AHI ≥ 30). Hypertension was more frequent in patients with severe OSA (85.7%) when compared to controls (40.0%) (P = 0.002). Stroke outcome, assessed by the Barthel index, tended to be more severe (P = 0.06) in cases with severe OSA. Patients with mild/moderate OSA and with severe OSA showed higher levels of IL-6 when compared to controls (P = 0.01 and P = 0.000, respectively). Among cases with acute stroke and severe OSA, IL-6 levels were correlated with lower oxyhemoglobin desaturation (r=-0.30; P = 0.001) and with the desaturation index (r = 0.15; P = 0.02). CONCLUSIONS: IL-6, an atherogenic marker, shows a commensurate increase in stroke patients with OSA. It is correlated with oxyhemoglobin desaturation and with desaturation index and may be a surrogate measure to evaluate continuous positive airway pressure therapy.
Asunto(s)
Isquemia Encefálica/complicaciones , Inflamación/etiología , Apnea Obstructiva del Sueño/etiología , Accidente Cerebrovascular/complicaciones , Anciano , Biomarcadores/sangre , Isquemia Encefálica/sangre , Isquemia Encefálica/fisiopatología , Estudios Transversales , Femenino , Humanos , Hipertensión/sangre , Hipertensión/complicaciones , Hipertensión/fisiopatología , Inflamación/sangre , Inflamación/fisiopatología , Interleucina-1beta/sangre , Interleucina-6/sangre , Masculino , Persona de Mediana Edad , Polisomnografía , Índice de Severidad de la Enfermedad , Apnea Obstructiva del Sueño/sangre , Apnea Obstructiva del Sueño/fisiopatología , Accidente Cerebrovascular/sangre , Accidente Cerebrovascular/fisiopatología , Encuestas y Cuestionarios , Factor de Necrosis Tumoral alfa/sangreRESUMEN
BACKGROUND AND PURPOSE: the objective was to evaluate the presence of Restless Legs Syndrome (RLS) in acute stroke, its association with sleep disturbances and clinical outcome during long-term follow-up. METHODS: this was a longitudinal study (N = 96, 59 men, mean age 64.0 ± 8.9) of cases with acute ischaemic stroke. Patients were asked about the occurrence of RLS symptoms before the cerebrovascular event. RLS was diagnosed using the criteria established by the International RLS Study Group. Stroke outcome was estimated by the Barthel Index and the modified Rankin Scale. Daytime somnolence (Epworth Sleepiness Scale -ESS > 10), poor sleep quality (Pittsburgh Sleep Quality Index -PSQI > 5) and risk of obstructive sleep apnea (OSA) (Berlin questionnaire) were evaluated. RESULTS: twelve patients (12.5%) met the diagnostic criteria for RLS. All cases had symptoms of RLS before stroke. However, none of the cases had a previous medical diagnosis of RLS or were on use of specific medication. In only one case, a family history of RLS was found. In all patients, RLS symptoms started after the age of 40 (mean age 64 ± 6.7). Daytime sleepiness (44.8%) and poor quality sleep (62.8%) were present. Patients with RLS (12.5%) presented greater neck circumference (P = 0.04) and worse sleep quality (P = 0.007). Risk of OSA (56.2%) was associated with hypertension [OR = 0.12; CI=0.03-0.42]. Stroke outcome was significantly worse at three and 12 months (ancova, P < 0.005) in patients with RLS, remaining after adjustment for diabetes and body mass index (P < 0.05). CONCLUSIONS: patients with acute stroke and RLS have worse clinical outcome, at three and 12 months of follow-up.