Retropharyngeal Hematoma as an Unusual Presentation of Myelodysplastic Syndrome: A Case Report.

BACKGROUND Retropharyngeal hematoma is a relatively rare diagnosis that requires a high clinical suspicion and stabilization of the airway to prevent rapid deterioration. We report a case of a spontaneous retropharyngeal hematoma in an elderly patient with myelodysplastic syndrome and associated thrombocytopenia. CASE REPORT A 90-year-old man with myelodysplastic syndrome was brought to the Emergency Department with complaints of difficulty swallowing and muffled voice for 24 hours. Upon arrival, his vital signs and physical exam were unremarkable, except that when he was asked to take a sip of water, he could not swallow it. Complete blood count was remarkable for leukocytosis of 14.3×10³/mcL, hemoglobin of 9.0 gm/dL, and platelet count of 26×10³/mcL. Chest X-ray and lateral soft-tissue neck X-rays were grossly unremarkable. The patient was admitted for further evaluation and was scheduled for esophagogastroduodenoscopy. During intubation for esophagogastroduodenoscopy, the patient was noted to have significant airway narrowing. A subsequent CT scan revealed a 3×2×2 cm supraglottic hypodensity, thought to represent a retropharyngeal hematoma. The patient was transferred to the Intensive Care Unit (ICU) and received platelet transfusions. The ICU course was complicated by anemia, which necessitated transfusion of packed red blood cells. On hospital day 7, the patient reported resolution of his symptoms and was discharged home. CONCLUSIONS This case adds to the growing body of literature on spontaneous retropharyngeal hematomas. High clinical suspicion is warranted in patients who present with acute dysphagia, odynophagia, and dysphonia. Prompt imaging and airway management are vital in managing patients with this condition.

Sleep debt at the community level: impact of age, sex, race/ethnicity and health.

OBJECTIVES: Insufficient sleep has become recognized as a pervasive problem in modern society. Sleep debt is a novel measure of sleep adequacy that may be useful in describing those at risk for inadequate sleep. Our objective was to investigate factors that may be associated with sleep debt at the population level, as well as build upon previous data that showed that minority groups may be more likely to have sleep debt. DESIGN: A cross-sectional population phone survey included questions regarding amount of sleep required and amount of sleep achieved. Sleep debt was calculated by subtracting sleep achieved from sleep required. SETTING: This study was designed by the Philadelphia Health Management Corporation and conducted over landlines and cell phones. PARTICIPANTS: The Random Digit Dialing method was used to randomly choose 8,752 adults older than 18 years from several counties in and around Philadelphia to answer questions about sleep. MEASUREMENTS: Logistic regression was performed to test associations between sleep debt and various sociodemographic factors in different population subgroups to identify those at risk for sub-optimal sleep duration. RESULTS: Sleep debt was seen to decrease with age, a novel finding that is in contrast with literature suggesting that older adults have poor sleep. Greater sleep debt was also associated with female gender, Hispanic/Latino ethnicity, <40 years of age, self-reported poor health, and increased stress. CONCLUSIONS: Although older adults may sleep less as they age, they may also require less sleep to feel rested, resulting in less sleep debt. This and other demographic factors, such as female gender and Hispanic/Latino ethnicity, can be used to identify those at higher risk of inadequate sleep and potentially manage their sleep debt.

Fibroblast growth factor 21 and thyroid hormone show mutual regulatory dependency but have independent actions in vivo.

Thyroid hormone (TH) regulates fibroblast growth factor 21 (FGF21) levels in the liver and in the adipose tissue. In contrast, peripheral FGF21 administration leads to decreased circulating levels of TH. These data suggest that FGF21 and TH could interact to regulate metabolism. In the present study, we confirmed that TH regulates adipose and hepatic FGF21 expression and serum levels in mice. We next investigated the influence of TH administration on key serum metabolites, gene expression in the liver and brown adipose tissue, and energy expenditure in FGF21 knockout mice. Surprisingly, we did not observe any significant differences in the effects of TH on FGF21 knockout mice compared with those in wild-type animals, indicating that TH acts independently of FGF21 for the specific outcomes studied. Furthermore, exogenous FGF21 administration to hypothyroid mice led to similar changes in serum and liver lipid metabolites and gene expression in both hypothyroid and euthyroid mice. Thus, it appears that FGF21 and TH have similar actions to decrease serum and liver lipids despite having some divergent regulatory effects. Whereas TH leads to up-regulation in the liver and down-regulation in brown adipose tissue of genes involved in the lipid synthesis pathway (eg, fatty acid synthase (FASN) and SPOT14), FGF21 leads to the opposite changes in expression of these genes. In conclusion, TH and FGF21 act independently on the outcomes studied, despite their ability to regulate each other's circulating levels. Thus, TH and FGF21 may modulate the availability of each other in critical metabolic states.

Testosterone influences spatial strategy preferences among adult male rats.

Males outperform females on some spatial tasks, and this may be partially due to the effects of sex steroids on spatial strategy preferences. Previous work with rodents indicates that low estradiol levels bias females toward a striatum-dependent response strategy, whereas high estradiol levels bias them toward a hippocampus-dependent place strategy. We tested whether testosterone influenced the strategy preferences in male rats. All subjects were castrated and assigned to one of three daily injection doses of testosterone (0.125, 0.250, or 0.500 mg/rat) or a control group that received daily injections of the drug vehicle. Three different maze protocols were used to determine rats' strategy preferences. A low dose of testosterone (0.125 mg) biased males toward a motor-response strategy on a T-maze task. In a water maze task in which the platform itself could be used intermittently as a visual cue, a low testosterone dose (0.125 mg) caused a significant increase in the use of a cued-response strategy relative to control males. Results from this second experiment also indicated that males receiving a high dose of testosterone (0.500 mg) were biased toward a place strategy. A third experiment indicated that testosterone dose did not have a strong influence on the ability of rats to use a nearby visual cue (floating ball) in the water maze. For this experiment, all groups seemed to use a combination of place and cued-response strategies. Overall, the results indicate that the effects of testosterone on spatial strategy preference are dose dependent and task dependent.

FGF21 regulates PGC-1α and browning of white adipose tissues in adaptive thermogenesis.

Certain white adipose tissue (WAT) depots are readily able to convert to a "brown-like" state with prolonged cold exposure or exposure to ß-adrenergic compounds. This process is characterized by the appearance of pockets of uncoupling protein 1 (UCP1)-positive, multilocular adipocytes and serves to increase the thermogenic capacity of the organism. We show here that fibroblast growth factor 21 (FGF21) plays a physiologic role in this thermogenic recruitment of WATs. In fact, mice deficient in FGF21 display an impaired ability to adapt to chronic cold exposure, with diminished browning of WAT. Adipose-derived FGF21 acts in an autocrine/paracrine manner to increase expression of UCP1 and other thermogenic genes in fat tissues. FGF21 regulates this process, at least in part, by enhancing adipose tissue PGC-1α protein levels independently of mRNA expression. We conclude that FGF21 acts to activate and expand the thermogenic machinery in vivo to provide a robust defense against hypothermia.