One Night (one + night)

Distribution by Scientific Domains


Selected Abstracts


Angioedema from angiotensin-converting enzyme (ACE) inhibitor treated with complement 1 (C1) inhibitor concentrate

ACTA ANAESTHESIOLOGICA SCANDINAVICA, Issue 1 2006
E. W. Nielsen
Background:, Up to seven in every 1000 patients experience angioedema from angiotensin-converting enzyme (ACE) inhibitors, even after many years of use. In 2003, every 20th Norwegian used an ACE inhibitor. Case report:, A 61-year-old woman with chronic obstructive pulmonary disease and a past acute myocardial infarction had used 7.5 mg of ramipril daily for the past 7 years. She also used acetylsalicylic acid, simvastatin, theophylline and salmeterol. One night she woke up with edema of the tongue. On hospital arrival, 250 mg of hydrocortisone and 5 mg of dexchlorpheniramine were given intravenously (i.v.) and 0.3 mg of epinephrine was given subcutaneously (s.c.). The edema of the tongue progressed over the next 8 h and made the tongue protrude. Fiberscopy revealed glassy edema of the arytenoids. Inspiratory stridor was heard and the patient could not speak. She became increasingly uneasy and restless. Berinert® complement 1 (C1) inhibitor concentrate (1500 units) was administered i.v. Over the following 20 min, stridor gradually subsided, the patient calmed and she was able to talk. Discussion:, ACE inhibitor-provoked angioedema shares many clinical features with hereditary angioedema (HAE), including a limited effect of steroids, antihistamines and epinephrine. HAE, caused by excess bradykinin formation as a result of C1 inhibitor deficiency, usually has its laryngeal edema effectively reversed by C1 inhibitor in less than 0.5 h. Although patients experiencing ACE inhibitor-provoked angioedema have normal C1 inhibitor values, as in our patient, excess bradykinin is probably important as ACE breaks down bradykinin. It is unknown why ACE inhibitor-provoked angioedema appears in some and sometimes after many years of use. Conclusion:, We believe that C1 inhibitor was effective in reversing the ACE inhibitor-induced angioedema in our patient. [source]


No persisting effect of partial sleep curtailment on cognitive performance and declarative memory recall in adolescents

JOURNAL OF SLEEP RESEARCH, Issue 1-Part-I 2010
MARTA KOPASZ
Summary Growing evidence indicates that sleep facilitates learning and memory processing. Sleep curtailment is increasingly common in adolescents. The aim of this study was to examine the effects of short-term sleep curtailment on declarative memory consolidation in adolescents. A randomized, cross-over study design was chosen. Twenty-two healthy subjects, aged 14,16 years, spent three consecutive nights in the sleep laboratory with a bedtime of 9 h during the first night (adaptation), 4 h during the second (partial sleep curtailment) and 9 h during the third night (recovery). The control condition consisted of three consecutive nights with bedtimes of 9 h. Both experimental conditions were separated by at least 3 weeks. The acquisition phase for the declarative tests was between 16:00 and 18:00 hours before the second night. Memory performance was examined in the morning after the recovery night. Executive function, attention and concentration were also assessed to control for any possible effects of tiredness. During the 4-h night, we observed a curtailment of 50% of non-rapid eye movement (non-REM), 5% of slow wave sleep (SWS) and 70% of REM sleep compared with the control night. Partial sleep curtailment of one night did not influence declarative memory retrieval significantly. Recall in the paired-associate word list task was correlated positively with percentage of non-REM sleep in the recovery night. Declarative memory consolidation does not appear to be influenced by short-term sleep curtailment in adolescents. This may be explained by the high ability of adolescents to compensate for acute sleep loss. The correlation between non-REM sleep and declarative memory performance supports earlier findings. [source]


The effects of one night of sleep deprivation on known-risk and ambiguous-risk decisions

JOURNAL OF SLEEP RESEARCH, Issue 3 2007
BENJAMIN S. MCKENNA
Summary Sleep deprivation has been shown to alter decision-making abilities. The majority of research has utilized fairly complex tasks with the goal of emulating 'real-life' scenarios. Here, we use a Lottery Choice Task (LCT) which assesses risk and ambiguity preference for both decisions involving potential gains and those involving potential losses. We hypothesized that one night of sleep deprivation would make subjects more risk seeking in both gains and losses. Both a control group and an experimental group took the LCT on two consecutive days, with an intervening night of either sleep or sleep deprivation. The control group demonstrated that there was no effect of repeated administration of the LCT. For the experimental group, results showed significant interactions of night (normal sleep versus total sleep deprivation, TSD) by frame (gains versus losses), which demonstrate that following as little as 23 h of TSD, the prototypical response to decisions involving risk is altered. Following TSD, subjects were willing to take more risk than they ordinarily would when they were considering a gain, but less risk than they ordinarily would when they were considering a loss. For ambiguity preferences, there seems to be no direct effect of TSD. These findings suggest that, overall, risk preference is moderated by TSD, but whether an individual is willing to take more or less risk than when well-rested depends on whether the decision is framed in terms of gains or losses. [source]


Night-to-night alterations in sleep apnea type in patients with heart failure

JOURNAL OF SLEEP RESEARCH, Issue 3 2006
R. TKACOVA
Summary In patients with heart failure, apnea type can shift overnight from mainly obstructive to mainly central in association with reductions in PCO2 and increases in periodic breathing cycle length, indicative of a fall in cardiac output. We hypothesized that the predominant apnea type could also vary from one night to another in association with alterations in PCO2 and cycle length. We studied 12 men with heart failure in whom the predominant apnea type changed from one night to the next over periods of at least 1 month, and two groups with either predominantly obstructive or central sleep apnea (OSA or CSA) in whom apnea type remained stable over time. In patients with unstable apnea type (n = 12, duration between sleep studies 9.0 ± 4.4 months), PCO2 was significantly lower (37.6 ± 1.6 mmHg versus 41.7 ± 1.9 mmHg, P < 0.01), and cycle length significantly longer (61.9 ± 3.4 s versus 51.0 ± 1.9 s, P < 0.001) during nights with predominantly central than nights with predominantly obstructive apnea. In contrast, in both the stable central (n = 8, duration between sleep studies 11.9 ± 5.3 months) and the stable obstructive (n = 8, duration between studies 6.9 ± 5.2 months) sleep apnea groups, neither PCO2 nor cycle length changed significantly between the baseline and follow-up sleep studies. We conclude that in some patients with heart failure, OSA and CSA are part of a spectrum of periodic breathing that can shift over time in association with alterations in PCO2, cycle length and probably cardiac function. [source]


Association of body rolling, leg rolling, and rhythmic feet movements in a young adult: A video-polysomnographic study performed before and after one night of clonazepam

MOVEMENT DISORDERS, Issue 4 2008
Giovanni Merlino MD
Abstract We report clinical and polysomnographic data of a young adult affected by several forms of rhythmic movement disorder (RMD), present in the same night, including a new kind of it, known as rhythmic feet movements. The patient was monitored by means of three consecutive video-polysomnographic recordings, the first two performed to confirm the presence of the sleep disorder and the last one to observe the acute effectiveness of clonazepam on rhythmic movements. We discuss the characteristics of the RMD and the response to the first administration of pharmacological treatment, observed in our patient. © 2007 Movement Disorder Society [source]


The Road to Danger: The Comparative Risks of Driving While Sleepy,,

THE LARYNGOSCOPE, Issue 5 2001
Nelson B. Powell MD
Abstract Objectives/Hypothesis A large sector of the population of the United States has sleep deprivation directly leading to excessive daytime sleepiness. The prevalence of excessive daytime sleepiness in this population ranges from 0.3% to 13.3%. The consequences of even 1 to 2 hours of sleep loss nightly may result in decrements in daytime functions resulting in human error, accidents, and catastrophic events. The magnitude of risks in the workplace or on the highways resulting from sleepiness is not fully understood or appreciated by the general population. Hence, to more clearly emphasize the magnitude of these risks, we question whether mild sleep deprivation may have the same effect as alcohol on reaction times and driving performance. Study Design Nonrandomized prospective cohort investigation. Methods Sixteen healthy matched adult subjects (50% women) were stratified into two groups, sleep deprived and alcohol challenged. The sleep-deprived group was further subdivided into acute (one night without sleep) and chronic (2 h less sleep nightly for 7 d) sleep deprivation. Each group underwent baseline reaction time testing and then drove on a closed course set up to test performance. Seven days later, the group repeated this sequence after either sleep deprivation or alcohol intake. Results There were no significant between-group differences (sleep deprivation or alcohol challenged) in the changes before and after intervention for all 11 reaction time test metrics. Moreover, with few exceptions, the magnitude of change was nearly identical in the two groups, despite a mean blood alcohol concentration of 0.089 g/dL in the alcohol-challenged group. On-track driving performances were similar (P = .724) when change scores (hits and errors) between groups were compared (baseline minus final driving trial). Conclusion This comparative model suggests that the potential risks of driving while sleepy are at least as dangerous as the risks of driving illegally under the influence of alcohol. [source]


Cryptic local populations in a temperate rainforest bat Chalinolobus tuberculatus in New Zealand

ANIMAL CONSERVATION, Issue 4 2000
Colin F. J. O'Donnell
Population structure of the threatened long-tailed bat (Chalinolobus tuberculatus) was studied over five summers between 1993 and 1998, in temperate Nothofagus rainforest in Fiordland, New Zealand. Composition of 95 communal groups was sampled and spatial distribution of individually marked bats investigated. Individual C. tuberculatus moved to new roost sites virtually every day. Long term non-random associations among individuals were found by a cluster analysis that revealed three distinct social groups. Groups contained on average 72.0 (± 26.0) (mean ± SD), 99.3 (± 19.0) and 131.7 (± 16.5) marked individuals/year. Collective foraging ranges of the three groups overlapped but roosting occurred in three geographically distinct adjacent areas. Only 1.6% of individuals switched between groups. Non-reproductive females and males switched between groups more often than reproductive females but individuals switched only once or twice during the study and then just for one night. Juveniles of both sexes were associated with their natal group as 1 year-olds and then later when breeding. Social groups were cryptic because foraging ranges of groups overlapped, bats belonging to each group spread over many roosts each day, and these roost sites changed from day to day. Bats moved infrequently between groups, potentially linking the local population assemblages. Future research should explore whether the population is structured in demes. Population structure did not conform to traditional metapopulation models because groups occurred in homogeneous habitat extending over a large geographical area. Conserving bat populations should entail preserving a representative number of subgroups but development of models for predicting minimum number of effective local populations is still required. [source]


A Nonanuclear Copper(II) Polyoxometalate Assembled Around a ,-1,1,1,3,3,3-Azido Ligand and Its Parent Tetranuclear Complex

CHEMISTRY - A EUROPEAN JOURNAL, Issue 6 2005
Pierre Mialane Dr.
Abstract Reaction of CuII, [,-SiW10O36]8,, and N3, affords three azido polyoxotungstate complexes. Two of them have been characterized by single-crystal X-ray diffraction. Complex KNaCs10[{,-SiW10O36Cu2(H2O)(N3)2}2],26,H2O (1) is obtained as crystals in few hours after addition of CsCl. This linear tetranuclear CuII complex consists in two [,-SiW10O36Cu2(H2O)(N3)2]6, units connected through two WO bridges. When the filtrate is left to stand for one night, a new complex is obtained. From both elemental analysis and IR spectroscopy, it has been postulated that this compound could be formulated K1.5Cs5.5[SiW10O37Cu2(H2O)2(N3)],14,H2O (1,a), showing the loss of one azido ligand per polyoxometalate unit. Finally, when no cesium salt is added to the reaction medium, the nonanuclear complex K12Na7[{SiW8O31Cu3(OH)(H2O)2(N3)}3(N3)],24,H2O (2) is obtained after three days. Compound 2 crystallizes in the R3c space group and consists in three {Cu3} units related by a C3 axis passing through the exceptional ,-1,1,1,3,3,3-azido bridging ligand. Each trinuclear CuII unit is embedded in the [,-SiW8O31]10, ligand, an unprecedented tetravacant polyoxometalate, showing that partial decomposition of the [,-SiW10O36]8, precursor occurs with time in such experimental conditions. Magnetically, complex 1 behaves as two isolated {Cu2(,1,1 -N3)2} pairs in which the metal centers are strongly ferromagnetically coupled (J=+224 cm,1, g=2.20), the coupling through the WO bridges being negligible. The magnetic behavior of complex 2 has also been studied. Relatively weak ferromagnetic couplings (J1=+1.0 cm,1, J2= +20.0 cm,1, g=2.17) have been found inside the {Cu3} units, while the intertrimeric magnetic interactions occurring through the hexadentate azido ligand have been found to be antiferromagnetic (J3=,5.4 cm,1) and ferromagnetic (J4=+1.3 cm,1) with respect to the end-to-end and end-on azido-bridged CuII pairs, respectively. [source]