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Biomedical subjects

C Guilleminault

Publications and source records attributed to C Guilleminault.

At least 37 records · Page 2Linked to original sources
PubMed2001

Variability of respiratory effort in relation to sleep stages in normal controls and upper airway resistance syndrome patients.

OBJECTIVE: Investigation of the role of sleep states on the respiratory effort of controls and subjects with upper airway resistance syndrome (UARS) using nasal cannula/pressure transducer system and esophageal manometry. PATIENTS AND METHODS: One night's monitoring of sleep and breathing, including the determination of peak end inspiratory esophageal pressure (respiratory effort) with esophageal manometry and flow limitation with nasal cannula. Analysis of the data, breath-by-breath, using visual inspection and a computerized program. Setting - a university sleep laboratory. Patients were nine men with UARS and nine control men matched for age, ethnicity, and body mass index. RESULTS: A modulation of respiratory effort by sleep state and stages is seen in all subjects, the lowest noted during REM sleep and the highest associated with Slow Wave Sleep. When total nocturnal breaths are investigated, a significant difference between peak end inspiratory esophageal pressure [(Pes)-considered as an index of respiratory effort] is noted between normal subjects and UARS. Two specific breathing patterns, seen primarily in UARS patients, are NREM sleep stage dependent. Crescendos (defined as more negative peak end inspiratory Pes with each successive abnormal breath) occur mostly during stages 1-2 NREM sleep, while segments consisting of regular and continuous, breath-after-breath, high respiratory efforts are associated with Slow Wave Sleep. Depending on sleep stage, visually scored arousal response displays differences in Pes negativity. The termination of the abnormal breathing pattern, always well defined with Pes, is not necessarily associated with a pattern of 'flow limitation' at the nasal cannula tracing, even when a visually scored EEG arousal is present. CONCLUSIONS: UARS patients have significantly more breaths, with more negative peak end inspiratory Pes, than do control subjects. The modulation of peak end inspiratory Pes (an index of respiratory effort) by sleep stage and state differs in UARS patients and control subjects. The nasal cannula/pressure transducer system may not detect all abnormal breathing pattern during sleep. As indicated by the visual sleep scoring, repetitive arousals may lead to more or less severe sleep fragmentation.

Journal Article↗
PubMed2001

Is there a link between subjective daytime somnolence and sickness absenteeism? A study in a working population.

A number of studies have highlighted the increasing incidence and financial cost of sleep-related disorders in the general population, but little research has been carried out on the impact of subjective daytime somnolence on health status. The existence of a survey of the health of employees of the French National Gas and Electricity Board has allowed us to investigate this question and measure the link between subjective daytime somnolence and sickness absenteeism, used here as a general health indicator. In order to evaluate the quality of sleep over the previous 3 months, a questionnaire was given to each participant. The association between subjective daytime somnolence and absence as a result of sickness was explored using the data of sickness absenteeism provided by the company's social security department during a 12-month follow-up period. Of our 1105 subjects, 6.7% reported severe subjective daytime somnolence of 3 days or more a week and 30% of our study population had at least one spell of sickness absence during the 12-month period of follow-up. A strong association was observed between subjective daytime somnolence and sickness absence, which remained significant even after adjustment for potential confounding variables (age, sex, employment grade, sleep symptoms and self-reported diseases). The odds-ratio for absence as a result of sickness during the follow-up period associated with subjective daytime somnolence of 3 days or more a week was 2.2 (95% CI: 1.3--3.8). Employees suffering from severe subjective daytime somnolence lose more working days for health reasons than their more alert colleagues. This may have long-term implications for employees' health.

Absenteeism↗
PubMed2001

Pattern analysis of sleep-deprived human EEG.

Progress during the past decade in non-linear dynamics and instability theory has provided useful tools for understanding spatio-temporal pattern formation. Procedures which apply principle component analysis (using the Karhunen-Loeve decomposition technique) to the multichannel electroencephalograph (EEG) time series have been developed. This technique shows localized changes of cortical functioning; it identifies increases and decreases of the activity of localized cortical regions over time while the subject performs a simple task or test. It can be used to demonstrate the change in cortical dynamics in response to a continuous challenge. Using 16 EEG electrodes, the technique provides spatio-temporal information not obtained with power spectrum analysis, and includes the weighted information given with omega complexity. As an application, we performed a pattern analysis of sleep-deprived human EEG data in 20 healthy young men. Electroencephalograph recordings were performed on subjects for <2 min, with eyes closed after normal sleep and after 24 h of experimentally-induced sleep deprivation. The significant changes in the eigenvector components indicated the relative changes of local activity in the brain with progressive sleep deprivation. A sleep deprivation effect was observed, which was hemispherically correlated but with opposite directional dynamics. These changes were seen in the temporo-parietal regions bilaterally. The application of the technique showed that the simple test task was performed with a limited unilateral hemispheric involvement at baseline, but needed a much larger cortical participation with decreased frontal activity and increased coherence and bilateral hemispheric involvement. The calculations performed demonstrated that the same weighted changes as those obtained with omega complexity were shown, but the technique had the added advantage of showing the localized directional changes of the principle eigenvector at each studied electrode, pointing out the cortical localized region affected by the sleep deprivation and toward which direction the environmental challenge induced the spatial change. This methodology may allow the evaluation of changes in local dynamics in brain activity in normal and pathological conditions.

Adult↗
PubMed2001

How age and daytime activities are related to insomnia in the general population: consequences for older people.

OBJECTIVES: To determine the role of activity status and social life satisfaction on the report of insomnia symptoms and sleeping habits. DESIGN: Cross-sectional telephone survey using the Sleep-EVAL knowledge base system. SETTING: Representative samples of three general populations (United Kingdom, Germany, and Italy). PARTICIPANTS: 13,057 subjects age 15 and older: 4,972 in the United Kingdom, 4,115 in Germany, and 3,970 in Italy. These subjects were representative of 160 million inhabitants. MEASUREMENTS: Clinical questionnaire on insomnia and investigation of associated pathologies (psychiatric and neurological disorders). RESULTS: Insomnia symptoms were reported by more than one-third of the population age 65 and older. Multivariate models showed that age was not a predictive factor of insomnia symptoms when controlling for activity status and social life satisfaction. The level of activity and social interactions had no influence on napping, but age was found to have a significant positive effect on napping. CONCLUSIONS: These results indicate that the aging process per se is not responsible for the increase of insomnia often reported in older people. Instead, inactivity, dissatisfaction with social life, and the presence of organic diseases and mental disorders were the best predictors of insomnia, age being insignificant. Healthy older people (i.e., without organic or mental pathologies) have a prevalence of insomnia symptoms similar to that observed in younger people. Moreover, being active and satisfied with social life are protective factors against insomnia at any age.

Adolescent↗
PubMed2001

Patient's perception of the facial appearance after maxillomandibular advancement for obstructive sleep apnea syndrome.

PURPOSE: The goal of this study was to evaluate the patient's perception of the facial appearance after maxillomandibular advancement (MMA) surgery for obstructive sleep apnea syndrome (OSAS). PATIENTS AND METHODS: During a 14-month period, 58 patients underwent MMA for OSAS. All of the patients underwent preoperative and postoperative cephalometric analysis. Between 6 and 12 months after surgery, a questionnaire was mailed to each patient. The questionnaire asked the patient to evaluate subjectively their postoperative facial appearance. Visual analog scale ([VAS] 0 to 10) was used to assess the extent of the facial changes. RESULTS: Forty-four (76%) patients (39 men, 6 women) responded to the questionnaire. Cephalometric analysis revealed that 40 patients had maxillomandibular protrusion postoperatively. Forty-two (96%) of the 44 patients reported changes in their facial appearance (VAS, 4.8 +/- 2.5). Twenty-four (55%) patients reported favorable facial changes (ie, they were more attractive [15 patients] and/or more youthful). Fourteen patients gave neutral responses (ie, they were no more or no less attractive). Four patients gave unfavorable responses (ie, they were less attractive after surgery). CONCLUSION: The results suggest that most patients who underwent MMA for OSAS noted moderate changes in their facial appearance. Despite significant maxillomandibular protrusion based on the postoperative cephalometric analysis, more than 90% of the patients gave either positive or neutral responses to the changes in their facial appearance.

Adult↗
PubMed2001

Upper airway resistance syndrome in children: a clinical review.

Upper airway resistant syndrome (UARS) is more common in children than is obstructive sleep apnea syndrome (OSAS). Age will color the symptoms associated with the syndrome. UARS must be looked for in families with adult sleep-disordered breathing. Polygraphic recording during sleep will show flow limitation with usage of nasal cannula/pressure transducer system, but the abnormal breathing during sleep may be indicated also by burst of tachypnea without saturation drops. Esophageal pressure monitoring may be the only way to confirm a suspected diagnosis. A mild developmental anomaly of the craniofacial skeleton is often seen in these children even in the presence of enlarged tonsils and adenoids. Children with sleep-disordered breathing should have a maxillomandibular examination to assess the need for orthodontic treatment to expand the oral cavity.

Adenoids↗
PubMed2001

Excessive daytime sleepiness: a challenge for the practising neurologist.

The complaint of excessive daytime sleepiness, commonly encountered in neurological practice, may arise from a variety of disorders. The list of possibilities spans virtually every major area of medicine, neurology and psychiatry. A clear, detailed history is invaluable in negotiating these numerous diagnostic considerations; however, the symptom may be expressed in terms that do not directly denote somnolence (e.g. 'tiredness' or 'fatigue'). Accurate diagnosis is important, not only because of the negative impacts of sleepiness and its root causes on health and social function, but because excessive sleepiness is generally remediable with appropriate treatment. As our understanding of the neurological underpinnings of alertness and sleepiness deepens, improved treatment methods are bound to emerge.

Attention↗
PubMed2001

The road to danger: the comparative risks of driving while sleepy.

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.

Adult↗
PubMed2001

Uvulopalatopharyngoplasty, maxillomandibular advancement, and the velopharynx.

OBJECTIVE: To evaluate the presence of velopharyngeal insufficiency (VPI) symptoms and the associated changes of the velopharyngeal anatomy in patients who underwent maxillomandibular advancement (MMA) for persistent obstructive sleep apnea (OSA) after uvulopalatopharyngoplasty (UPPP). METHODS: Preoperative and postoperative cephalometric radiographs were analyzed to assess the anatomic changes of the velopharynx. In addition, a questionnaire survey was sent to the patients between 6 to 12 months after MMA. The questionnaires evaluated the presence and extent of VPI symptoms, including nasal regurgitation while eating or drinking as well as hypernasal speech. A 10-cm visual analog scale (VAS 0-10) was included to assess the impact of VPI symptoms on the patient's quality of life. In the patients who reported VPI symptoms, telephone interviews were conducted 1 year after the survey to evaluate the changes in VPI symptoms over time. RESULTS: Fifty-two of the 65 questionnaires were returned. Five patients (9.6%) reported nasal regurgitation of liquids when drinking hastily, with 2 patients reporting the occurrences as occasional and 3 patients reporting as rare. The impact of these symptoms on the patient's quality of life was minimal (VAS 0.6 +/- 0.4). Regurgitation of food or hypernasal speech was not reported. The telephone interviews 1 year later revealed that the symptoms have completely resolved in all 5 patients. Comparison of the preoperative and postoperative cephalometric radiographs demonstrated the pharyngeal depth increase was 48% of the amount of maxillary advancement and the functional pharyngeal length increased 53% of the maxillary advancement. The functional depth of the pharynx after MMA was significantly greater in the patients with VPI symptoms (P=.01). CONCLUSION: The results of this study suggest that patients who undergo MMA for persistent OSA after UPPP have a low risk of developing VPI. If symptoms occur postoperatively, they are mild and have minimal effect on the patient's quality of life; moreover, the symptoms usually resolve over time.

Cephalometry↗
PubMed2001

Radiofrequency treatment of turbinate hypertrophy in subjects using continuous positive airway pressure: a randomized, double-blind, placebo-controlled clinical pilot trial.

OBJECTIVES: To estimate the treatment effect of temperature-controlled radiofrequency (TCRF) reduction of turbinate hypertrophy in patients with sleep-disordered breathing (SDB) treated with nasal continuous positive airway pressure (CPAP), and to assess the impact of study design on this estimate. STUDY DESIGN: Prospective, randomized, double-blind, placebo-controlled clinical pilot trial. METHODS: Twenty-two CPAP-treated patients with SDB with turbinate hypertrophy were randomly assigned to either TCRF turbinate treatment (mean energy 415 +/- 37 J/turbinate; n = 17) or placebo control (n = 5). Changes in nasal obstruction were evaluated between pretreatment and 4 weeks post-treatment. The primary outcome assessed changes in the blinded examiners' findings of nasal obstruction on a visual analogue scale (VAS). Secondary outcomes included blinded patients' and unblinded examiner assessments of nasal obstruction (VAS), nightly CPAP use, adherence, and tolerance, along with sleepiness and general health status scales. The treatment group findings were subtracted from the changes in the placebo group to yield treatment effect. RESULTS: The primary outcome treatment effect by VAS was -0.9 cm (95% confidence interval [CI], -2.4, 0.7), and beyond the placebo effect of -1.5 cm (95% CI: -3.4, 0.3). The secondary treatment effect of the unblinded examiner was -3.0 cm (95% CI, -4.9, -1.1). A beneficial treatment effect was also seen on every secondary outcome except general health status, but only self-reported CPAP adherence (P = .03) was statistically significant. CONCLUSIONS: TCRF turbinate treatment appears to benefit nasal obstruction and CPAP treatment for SDB. Placebo control and double blinding are critical for establishing the true treatment effect. A future definitive trial is feasible to establish statistical significance of these findings.

Adult↗
PubMed2001

New insights into the pathogenesis and treatment of narcolepsy.

Narcolepsy is a complex neurologic disorder, which has significant negative impacts on the lives of those who have it. Although the disorder is treatable, traditional methods do not alleviate symptoms completely and often produce unwanted side effects. Fortunately, recent advances in the understanding of narcolepsy offer the promise of improved treatments in the foreseeable future.

Animals↗
PubMed2001

Sleep and daytime sleepiness in upper airway resistance syndrome compared to obstructive sleep apnoea syndrome.

This study has investigated differences in the nocturnal sleep and daytime sleepiness among patients with obstructive sleep apnoea syndrome (OSAS), upper airway resistance (UARS), sleep hypopnoea syndrome, and normal control subjects, using sleep scoring and spectral activity analysis of the electroencephalogram (EEG). Twelve nonobese males with UARS aged 30-60 yrs were recruited. These subjects were strictly matched for age and body mass index with twelve OSAS patients, 12 sleep hypopnoea syndrome patients, and 12 normal controls, all male. Daytime sleepiness was evaluated using the Epworth Sleepiness Scale (ESS) and the Multiple Sleep Latency Test (MSLT). The macrostructure of sleep was determined using international criteria and spectral analysis of the sleep EEG was obtained from a central lead. The sleep macrostructure of OSAS and UARS patients was significantly different from that of controls. These patients were also sleepier during the daytime than controls. Complaints of tiredness and daytime sleepiness, ESS and MSLT scores were similar in the different patient groups. Mild dysmorphia was present in all three patient groups. However, nocturnal sleep was significantly different among the different groups. OSAS patients had significantly more awake time during sleep than the UARS patients. The spectral activity of the total sleep time of the patient groups also differed significantly from that of controls. When the sleep spectral activity of UARS and OSAS patients were compared, OSAS patients had less slow wave sleep activity than UARS patients. UARS patients had a significantly higher absolute power in the 7-9 Hz bandwidth than OSAS patients. The absolute delta power over the different sleep cycles was also different between controls and patients, and between UARS and OSAS patients. There are clear differences in the macrostructure and spectral activity of sleep between upper airway resistance and obstructive sleep apnoea syndrome patients, demonstrated by differences in the cortical activity recorded in the central lead during sleep. Despite these nocturnal sleep differences, the tests of subjective daytime sleepiness are not significantly different.

Adult↗
PubMed2001

Sleep-disordered breathing and upper-airway anomalies in first-degree relatives of ALTE children.

From 1985 through 1995, 348 infants aged 3 wk-3 mo were referred to the Stanford Sleep Clinic for "apparent life-threatening events" (ALTE). A small group of 48 infants with no history of sleep-disordered breathing (SDB) was also recruited and used as controls (they comprised group C). We conducted a systematic investigation of relatives (parents, siblings, and grandparents) of the infants, including a clinical evaluation, craniofacial investigation, and the completion of an extensive (189-question) validated sleep/wake questionnaire. All data were calculated before the subdivision of ALTE infants into two groups. The subdivision was based on a blind scoring of the infants' polygraphic recordings; 42.5% of the infants were negative for SDB (Group A), whereas 57.5% of the infants were positive for SDB (Group B). Groups A and C were not significantly different from each other. Forty-three percent of the relatives of Group B infants had been treated for SDB (with nasal CPAP, surgical or dental appliance treatments) compared with 7.1% of Group A relatives. Clinical investigation indicated a significantly higher presence of small upper airways in the families of infants with SDB. About twice as many relatives reported the presence of asthma in Group B compared with Group A. Naso-oro-maxillomandibular anatomic traits that may lead to small upper airways in parents may be risk factors for abnormal breathing during sleep in their infants.

Case-Control Studies↗
PubMed2001

Risk factors for sleep bruxism in the general population.

OBJECTIVE: Sleep bruxism can have a significant effect on the patient's quality of life. It may also be associated with a number of disorders. However, little is known about the epidemiology of sleep bruxism and its risk factors in the general population. DESIGN: Cross-sectional telephone survey using the Sleep-EVAL knowledge based system. SETTINGS: Representative samples of three general populations (United Kingdom, Germany, and Italy) consisting of 158 million inhabitants. PARTICIPANTS: Thirteen thousand fifty-seven subjects aged > or = 15 years (United Kingdom, 4,972 subjects; Germany, 4,115 subjects; and Italy, 3,970 subjects). INTERVENTION: None. MEASUREMENTS: Clinical questionnaire on bruxism (using the International Classification of Sleep Disorders [ICSD] minimal set of criteria) with an investigation of associated pathologies (ie, sleep, breathing disorders, and psychiatric and neurologic pathologies). RESULTS: Grinding of teeth during sleep occurring at least weekly was reported by 8.2% of the subjects, and significant consequences from teeth grinding during sleep (ie, muscular discomfort on awakening, disturbing tooth grinding, or necessity of dental work) were found in half of these subjects. Moreover, 4.4% of the population fulfilled the criteria of ICSD sleep bruxism diagnosis. Finally, subjects with obstructive sleep apnea syndrome (odds ratio [OR], 1.8), loud snorers (OR, 1.4), subjects with moderate daytime sleepiness (OR, 1.3), heavy alcohol drinkers (OR, 1.8), caffeine drinkers (OR, 1.4), smokers (OR, 1.3), subjects with a highly stressful life (OR, 1.3), and those with anxiety (OR, 1.3) are at higher risk of reporting sleep bruxism. CONCLUSIONS: Sleep bruxism is common in the general population and represents the third most frequent parasomnia. It has numerous consequences, which are not limited to dental or muscular problems. Among the associated risk factors, patients with anxiety and sleep-disordered breathing have a higher number of risk factors for sleep bruxism, and this must raise concerns about the future of these individuals. An educational effort to raise the awareness of dentists and physicians about this pathology is necessary.

Adolescent↗
PubMed2001

Medications for the treatment of narcolepsy.

Narcolepsy is a syndrome of unknown aetiology characterised by excessive daytime sleepiness (often severe) usually in association with cataplexy (brief episodes of partial or complete muscle paralysis) and often with other uncommon symptoms. Due to limited disease-specific knowledge, medication treatment for this condition has focussed on specific symptom amelioration rather than improving or eliminating underlying disease mechanisms. Such treatment generally consists of stimulants for daytime sleepiness and anticataplectic medication for cataplexy; hence, both types of agents are reviewed in this article. Recent discoveries, including the finding that canine familial narcolepsy is caused by a single gene defect in the hypocretin receptor, coupled with the findings in human narcoleptics of undetectable hypocretin levels in the CSF and of severe hypocretin-containing neuronal atrophy in brains of deceased narcoleptics, have shifted the focus of narcolepsy treatment research to the hypocretin system. The hope is that a single agent can be developed to provide effective treatment for all symptoms of narcolepsy. While the mechanism of action in narcolepsy is unknown, gamma-hydroxybutyrate (GHB) is proving to be such an agent. Interestingly, GHB is not known to impact hypocretin pathways in the brain, yet specific research exploring this possible interaction has not been performed. The market for medications limited to use by narcoleptics is small because of the relatively low prevalence of narcolepsy; however, the prevalence of clinically important daytime sleepiness and/or fatigue is surprisingly high. New agents that effectively manage the sleepiness of narcolepsy thus have a much larger potential for appropriate use in treating sleepiness and fatigue in the general population. This fact has recently been demonstrated by the tremendous success of modafinil, a drug introduced to the market a little over 2 years ago, which was developed to treat sleepiness in narcolepsy but now is used in a much larger patient population.

Journal Article↗
PubMed2001

Sleep-disordered breathing. A view at the beginning of the new Millennium.

Obstructed sleep apnea syndrome and UARS are often missed in clinical practice. The pediatric population presenting with UARS or mild OSAS is the most commonly ignored because the symptoms are insidious. Often, their craniofacial morphology is not as altered as in the adult population because the effects of airway obstruction may not have been fully established. This is, however, the group in which trials aimed at redistributing bone growth and functional readaptations may be attempted. Dentists and orthodontists have the greatest opportunity to see these young individuals and may help identify them and participate in treatment options. Undoubtedly, functional appliances are not the ideal solution, but if used appropriately with the goal of enlarging the upper airway, they may obviate the need for aggressive surgical treatments later in life. Orthopedic palatal and transverse expansion appliances can widen the jaw bases at the level of the basal bone. Orthodontically uprighting lingually tipped teeth to widen the alveolar bone housing the teeth can help improve the oropharyngeal space indirectly by altering the resting posture of the tongue. These measures in conjunction with other simultaneous, noninvasive modalities may prove to be effective.

Adult↗
PubMed2001

[Diurnal consequence of insomnia: impact on quality of life].

Insomnia is not only a disease of sleep, it has also daily consequences: fatigue, irritability, impaired daytime functioning. These complaints are regent reported by the patients, however the objective tests assessing alertness in insomnia are usually not impaired when compared with good sleepers. We wanted to appreciate more accurately the daily consequences of insomnia, in terms of quality of life. 240 severe insomniacs (according to the DSM-IV criterias) and 391 good sleepers received a questionnaire on quality of life items. Depressed and anxious patients were excluded from this group. The questionnaire was built by a multidisciplinary group, based on insomniac's interviews. It was primarily tested in a small sample and then proposed in the entire group. Insomniac's quality of life appeared to be significantly impaired in comparison with good sleepers. They experienced more fatigue and more sleepiness during the daytime. They reported more attention disorders and memory complaints. They seemed to be more irritable and sensitive to the environment. At work they made more mistakes and had more sic leave. They also had poorer relationships with relatives and family than good sleepers.

Adult↗