RESUMEN
PURPOSE: Obesity is associated with both obstructive sleep apnea (OSA) and obesity hypoventilation. Differences in adipose tissue distribution are thought to underlie the development of both OSA and hypoventilation. We explored the relationships between the distribution of upper airway, neck, chest, abdominal and muscle fat in very obese individuals. METHODS: We conducted a cross-sectional cohort study of individuals presenting to a tertiary sleep clinic or for assessment for bariatric surgery. Individuals underwent magnetic resonance (MR) imaging of their upper airway, neck, chest, abdomen and thighs; respiratory polygraphy; 1 week of autotitrating CPAP; and morning arterial blood gas to determine carbon dioxide partial pressure and base excess. RESULTS: Fifty-three individuals were included, with mean age of 51.6 ± 8.4 years and mean BMI of 44.3 ± 7.9 kg/m2; there were 27 males (51%). Soft palate, tongue and lateral wall volumes were significantly associated with the AHI in univariable analyses (p < 0.001). Gender was a significant confounder in these associations. No significant associations were found between MRI measures of adiposity and hypoventilation. CONCLUSIONS: In very obese individuals, our results indicate that increased volumes of upper airway structures are associated with increased severity of OSA, as previously reported in less obese individuals. Increasingly large upper airway structures that reduce pharyngeal lumen size are likely to lead to OSA by increasing the collapsibility of the upper airway. However, we did not show any significant association between regional fat distribution and propensity for hypoventilation, in this population.
Asunto(s)
Tejido Adiposo/diagnóstico por imagen , Imagen por Resonancia Magnética , Síndrome de Hipoventilación por Obesidad/complicaciones , Obesidad Mórbida/complicaciones , Apnea Obstructiva del Sueño/complicaciones , Estudios Transversales , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios ProspectivosRESUMEN
The potential harmful effects of ionising radiation continue to be highlighted. Radiation reduction techniques have largely consisted of low-dose techniques rather than a shift to non-ionising methods of imaging. CT scanning is frequently employed for imaging the craniofacial skeleton despite being one of the key anatomical regions for radiation protection in view of the radiosensitive lens and thyroid gland. We describe a low flip angle gradient echo MRI sequence which provides high image contrast between bone and other tissues but reduces the contrast between individual soft tissues. This permits the "black bone" to be easily distinguished from the uniformity of the soft tissues. While maintaining a repetition time of 8.6 ms and an echo time of 4.2 ms, the flip angle which provided optimised suppression of both fat and water was identified to be 5°. The biometric accuracy of this sequence was confirmed using a phantom to obtain direct anatomical measurements and comparable CT scanning. The average discrepancy between black bone MRI measurements and direct anatomical measurements was 0.32 mm. Black bone MRI therefore has the potential to reduce radiation exposure by replacing CT scanning when imaging the facial skeleton, with particular scope for imaging benign conditions in the young.
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Imagen por Resonancia Magnética/métodos , Cráneo/anatomía & histología , Artefactos , Biometría , Huesos/anatomía & histología , Tejido Conectivo/anatomía & histología , Humanos , Variaciones Dependientes del Observador , Fantasmas de ImagenRESUMEN
OBJECTIVE: To examine the relationships between early hyperlactataemia, acidosis, organ failure, and mortality in children admitted to intensive care. DESIGN: Prospective observational study. Children with lactate levels > 2 mmol/l were eligible for enrolment. Post-operative patients and those with inherited metabolic disease were excluded. Seven hundred and five children admitted to intensive care were screened, and 50 children with hyperlactataemia (incidence 7%), aged 20.3 months (0.1-191) were enrolled and followed up. The Paediatric Risk of Mortality (PRISM) score, Multiorgan System Failure (MOSF) score, length of ICU stay, and outcome were recorded. Data were collected for lactate (mmol/l), pH, and base excess (BE) until 24 h after admission. Data are reported as median (range) and were analysed by the Mann-Whitney, Fisher's Exact, and Kruskal-Wallis tests, and chisquared test for trend. RESULTS: Overall mortality in the screening group was 70/705 (10%). In the study group (n = 50) median PRISM score was 19 (4-49), median MOSF score 2 (1-4), and observed mortality 32/50 (64%). Median duration of ICU stay was 6 days (2-32) in survivors, and median time until death 3 days (0-13) in nonsurvivors. Eleven nonsurvivors (34%) died within 24 h. In the screening group, hyperlactataemia on admission identified mortality with likelihood ratio = 15. In the study group, neither the admission lactate (3.8 vs 4.6 mmol/l, P = 0.27), pH (7.32 vs 7.30, P = 0.6), nor BE (-7.5 vs -8, P = 0.45) differed significantly between survivors and nonsurvivors. Neither the admission nor peak lactate increased with increasing MOSF score (P = 0.5 and 0.54). The median peak lactate level was 5 mmol/l (2-9.3) in survivors compared to 6.8 mmol/l (2.3-22) in nonsurvivors (P = 0.02), and the cumulative average lactate level was 2.4 mmol/l (1-4.9) in survivors, compared to 4.5 mmol/l (1.6-21) in nonsurvivors (P = 0.0003). Persistent hyperlactataemia 24 h after admission identified mortality with likelihood ratio = 7. CONCLUSION: Hyperlactataemia on admission to intensive care is associated with a high mortality in children. Nonsurvivors within this group may be distinguished by the peak lactate level, or by persistent hyperlactataemia after 24 h of treatment.
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Acidosis Láctica/etiología , Acidosis Láctica/mortalidad , Acidosis Láctica/sangre , Adolescente , Niño , Preescolar , Enfermedad Crítica , Femenino , Humanos , Incidencia , Lactante , Recién Nacido , Ácido Láctico/sangre , Tiempo de Internación , Londres/epidemiología , Masculino , Estudios ProspectivosRESUMEN
UNLABELLED: Disseminated herpes simplex virus infection is a potentially fatal condition which may be difficult to differentiate from bacterial sepsis. We report the case of a neonate with overwhelming herpes simplex (type 2) viraemia who presented with 'septic shock'. CONCLUSION: A low procalcitonin level (1.6 ng/ml), inconsistent with bacteraemia, suggests an alternative aetiology and may strengthen the case for antiviral therapy.
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Calcitonina/sangre , Herpes Genital/sangre , Precursores de Proteínas/sangre , Sepsis/sangre , Biomarcadores , Péptido Relacionado con Gen de Calcitonina , Resultado Fatal , Femenino , Humanos , Recién Nacido , Choque Séptico/sangreRESUMEN
PIP: The old New Jersey abortion statute held that abortion before the quickening of the child was not indictable. The Young Women's Christian Association (YWCA) of Princeton, New Jersey, is a consolidation of 2 suits in the District Court questioning the constitutionality of the New Jersey statute. The court ruled that the women plaintiffs were without standing to raise the question of constitutionality. The court also ruled that because of the prosecutions for committing illegal abortions, the abortions, the physicians had a sufficient legal interest to argue that the statute deprives the physician of the right to practice medicine according to the highest standards of medical practice and violates the right to privacy of the patients.^ieng