Plasma obestatin and autonomic function are altered in orexin-deficient narcolepsy, but ghrelin is unchanged

Narcolepsy-cataplexy is characterised by orexin deficiency, sleep disturbance, obesity and dysautonomia. Ghrelin and obestatin affect both energy intake and sleep. Our aim was to investigate ghrelin, obestatin and metabolic/autonomic function in narcolepsy-cataplexy. Eight narcolepsy-cataplexy patients (seven CSF orexin-deficient) and eight matched controls were studied. The subjects had a fixed energy meal with serial blood samples and measurement of heart rate variability (HRV). Fasting plasma obestatin was more than threefold higher in narcolepsy subjects (narcolepsy 89.6 ± 16 pg/ml vs. control 24.9 ± 3 pg/ml, p < 0.001). There was no change in HRV total power, but post-prandial low-frequency (LF) power and high-frequency (HF) power were lower in the narcolepsy group [area under the curve (AUC): HF power narcolepsy 1.4 × 10(5) ± 0.2 × 10(5) vs. control 3.3 × 10(5) ± 0.6 × 10(5 )ms(2)/h, p < 0.001]. On multiple regression analyses, the only significant predictor of plasma obestatin was HF power, which was inversely correlated with obestatin (β = -0.65 R (2) = 38 %, p = 0.009). Fasting and post-prandial plasma ghrelin were similar in both groups (narcolepsy 589.5 ± 88 pg/ml vs. control 686.9 ± 81 pg/ml, p = 0.5; post-prandial AUC-narcolepsy 161.3 ± 22 ng/ml/min vs. control 188.6 ± 62 ng/ml/min, p = 0.4). Only the narcolepsy group had significant suppression of plasma ghrelin after the meal (ANOVA, p = 0.004). In orexin-deficient narcolepsy, fasting plasma ghrelin is unaltered, and post-prandial suppression is preserved. Fasting plasma obestatin is increased and correlates with autonomic dysfunction. As obestatin affects NREM sleep, we suggest that increased plasma levels contribute to the disrupted sleep-state control in narcolepsy.

Predictors of a nursing home placement from a non-acute geriatric hospital

BACKGROUND

Identifying patients who need Nursing Home (NH) care following a hospital admission is important.

OBJECTIVE

To identify the factors that predispose to an NH discharge.

DESIGN

Prospective observational study with blinded end-point evaluation.

SETTING

A non-acute geriatric hospital.

SUBJECTS

Two hundred consecutive elderly patients who were admitted for rehabilitation following treatment for an acute illness.

MAIN OUTCOME MEASURES

Discharge to an NH or home.

RESULTS

Thirty-five out of the 150 live discharges (23.3%) were to an NH. NH discharges had a longer length of stay (38.5 versus 19.8 days; p < 0001). They were more likely to have visual impairment (p = 0.0009), confusion (p < 0.0001), wandering behaviour (p = 0.003), incontinence (p < 0.0001 or unsafe gait (p = 0.0005), to be on tranquillizers (p = 0.003), to be at risk of falls (p = 0.02) and to have sustained a fall while in hospital (p = 0.001). Multiple logistic regression identified confusion (p = 0.001), incontinence (p = 0.02), falls in hospital (p = 0.01), gait abnormalities (p < 0.001), tranquillizers (p < 0.001), impaired distant vision (p = 0.01) and living alone (p < 0.001) as independently associated with the risk of an NH discharge. This risk proportionately increased with the number of risk factors present: 4.28% for 0-2 factors, 25.8% for 3-4 factors and 81.8% for 5-6 factors (p < 0.0001).

CONCLUSION

These factors should be the target of specific rehabilitation in an attempt to reduce the risk of discharge to a nursing home and improve patient outcome.