The Sleep of the Ring: Comparison of the OURA Sleep Tracker Against Polysomnography.

Objective/Background: To evaluate the performance of a multisensor sleep-tracker (OURA ring) against polysomnography (PSG) in measuring sleep and sleep stages. Participants: Forty-one healthy adolescents and young adults (13 females; Age: 17.2 ± 2.4 years). Methods: Sleep data were recorded using the OURA ring and standard PSG on a single laboratory overnight. Metrics were compared using Bland-Altman plots and epoch-by-epoch (EBE) analysis. Results: Summary variables for sleep onset latency (SOL), total sleep time (TST), and wake after sleep onset (WASO) were not different between OURA ring and PSG. PSG-OURA discrepancies for WASO were greater in participants with more PSG-defined WASO (p < .001). Compared with PSG, OURA ring underestimated PSG N3 (~20 min) and overestimated PSG REM (~17 min; p < .05). PSG-OURA differences for TST and WASO lay within the ≤ 30 min a-priori-set clinically satisfactory ranges for 87.8% and 85.4% of the sample, respectively. From EBE analysis, OURA ring had a 96% sensitivity to detect sleep, and agreement of 65%, 51%, and 61%, in detecting "light sleep" (N1), "deep sleep" (N2 + N3), and REM sleep, respectively. Specificity in detecting wake was 48%. Similarly to PSG-N3 (p < .001), "deep sleep" detected with the OURA ring was negatively correlated with advancing age (p = .001). OURA ring correctly categorized 90.9%, 81.3%, and 92.9% into PSG-defined TST ranges of < 6 hr, 6-7 hr, > 7 hr, respectively. Conclusions: Multisensor sleep trackers, such as the OURA ring have the potential for detecting outcomes beyond binary sleep-wake using sources of information in addition to motion. While these first results could be viewed as promising, future development and validation are needed.

Tumor hipofisario familiar de compromiso somatomamotrópico / Familiar pituitary tumor with somatotropic compromise

Se describe por vez primera el adenoma hipofisario de estirpe familiar, con afección aparente sobre el somatomamotropo responsable de la secreción de hormona de crecimiento y prolactina, cuya transmisión fue de carácter antosómico domiante. Destacó que un par de miembros sin tumor demostrable, cursaron con datos clínicos (fenotipo) de acromegaloidismo. Al investigarse antígenos de histocompatibilidad resaltó que tanto los pacientes con tumor y otros sintomáticos pero sin tumor compartieron los mismos haplotipos, por lo que es muy posible que la investigación de antígenos HLA en los pacientes con tumor hipofisiario ayude a reconocer mejor su naturaleza y frecuencia