Presentation on theme: "Obstructive Sleep Apnea and Other Causes of Excessive Daytime Sleepiness."— Presentation transcript:
Obstructive Sleep Apnea and Other Causes of Excessive Daytime Sleepiness
Patient Scenario #1 A 45 year old man sought treatment of his snoring, which had been present for many years. His wife slept in another room because the snoring “shook the walls”. The patient reports excessive sleepiness (Epworth sleepiness scale score 18/24. Normal is 10 or less), morning headaches and problems concentrating at work. He admits to drinking more than five cups of coffee daily. There was no history of recent weight gain or alcohol use.
The Physical Examination Height: 5 feet 10 inches Weight: 190 pounds; Blood Pressure: 150/90 Neck 18 inch circumference HEENT: long, edematous uvula, dependent palate (low lying) Chest: clear Cardiac: normal Extremities: no edema
What is The Next Step? Sleep Apnea is the most common cause of excessive daytime sleepiness and snoring, but there are many other disorders that must be carefully considered.
Evaluating Causes of Excessive Daytime Sleepiness (EDS) Sleep Apnea Syndromes Upper airway resistance syndromes Narcolepsy Periodic leg (limb)movements in sleep Restless leg Syndrome Circadian Sleep Disorders Insomnia Withdrawal from Stimulants Drug dependence/Abuse Medication side effects Idiopathic Hypersomnia Brain tumors Parasomnias History Self-rating scale of Sleepiness Sleep-wake diary Polysomnography DisordersEvaluation All Cases Selected Cases MSLT Drug Screen
Epworth Sleepiness Scale: Measures average sleep propensity (chance of dozing) over 8 common situations that almost everyone encounters. SituationChance of Dozing Sitting and reading Watching T.V. Sitting inactive in a public place (i.e., theater, meeting) As a passenger in a car for 1 hour without a break Lying down to rest in the afternoon when circumstances permit Sitting talking to someone Sitting quietly after lunch without alcohol In a car while stopped for a few minutes in traffic Total (0-10 normal) 3= High chance of dozing; 2=moderate; 1=slight; 0=never
Stanford Sleepiness Scale: Measures subjective feelings of sleepiness Feeling active and vital; alert, wide awake Functioning at a high level, but not peak, able to concentrate Relaxed, awake, not at full alertness, responsive A little foggy, not at peak, let down Fogginess, beginning to lose interest in remaining awake, slowed down Sleepiness, prefer to be lying down, fighting sleep, woozy Almost in reverie, sleep onset soon, lost struggle to remain awake
Obstructive Sleep Apnea (O.S.A) OSA is a common disorder occurring in 4% of men and 2% of women. During sleep, closure of the upper airway results in cessation or diminished airflow despite continued respiratory effort. The termination of the apneic event is associated with a brief awakening. These arousals result in sleep fragmentation which reduces the amount of slow wave and REM sleep and causes varying degrees of daytime sleepiness.
Risk Factors for Sleep Disordered Breathing 1.Excess body weight 2.Large neck circumference 3.Male gender 4.Ethnicity 5.Age 6.Menopause 7.Anatomy of airway=soft and hard palate.
Indicators for a Polysomnography (PSG) Suspicion of disorders that disturb sleep like sleep apnea, periodic limb disorder, REM behavior disorder EDS Obesity Insomnia with daytime sleepiness Nocturnal behavioral disorders
Polysomnography Electrocardiography (EKG) Electroencephalography (EEG) Electro-oculography (EOG) Electromyography (EMG) Pulse Oximetry Respiration: -Effort (chest and abdominal movements) -Airflow Snore sensor/microphone –Heat sensors measure airflow by detecting temperature changes in inspired and expired air Multiple physiologic parameters are measured and compared with the established norms. *Sleep conditions in the laboratory should be as close to the patients baseline sleep as possible.
Human Sleep Architecture Wake NREM sleep Stages 1 and 2 (light sleep) Stages 3 and 4 (deep sleep) REM sleep *Recognition of certain characteristic EEG patterns is essential for staging sleep
Electroencephalographic Lead Placement Central Occipital Mastoid *More electrodes can be added if nocturnal seizure is in the differential
Monitoring Eye Movements Standard : 2 eye channels Detecting horizontal/vertical eye movements Determining various stages of sleep
Electromyography (EMG) Diagnosis of Periodic Limb Movements(PLMS) Chin movement Diagnosis of certain sleep stages
Monitoring Respiration During Sleep 1.Apnea – cessation of airflow at the nose and mouth for 10 seconds or longer 2.Central Apnea – an absence of inspiratory effort 3.Obstructive Apnea – absence of airflow despite persistent respiratory effort 4.Mixed Apnea – initially no inspiratory effort…then terminates as an obstructive event 5.Hypopnea – reduction in airflow by 30% from baseline for > 10 seconds with > 4 % drop in oxygen saturation (controversial) 6.Respiratory Effort Related Arousals(RERAs) – an event not meeting the above criteria, yet produces an arousal from sleep.
Important Sleep Parameters on PSG Sleep stages (percentage) Sleep efficiency Apnea Hypopnea index (AHI), Respiratory Disturbance Index (RDI), paradoxical respiration; desaturations and cardiac arrhythmias
Diagnosis of OSA The Apnea + Hypopnea Index (AHI) a.k.a Respiratory Disturbance Index (RDI) = The Number of Apneas + hypopneas Per Hours of Sleep
Treatment of OSA Obesity- Diet and behavior modification Positional Therapy -non-supine sleep (pillow, etc.) -raise the head of the bed Nasal CPAP, BiPAP, Auto CPAP Oral appliances Soft tissue surgery or UPPP (Uvulopalatopharyngoplasty) Skeletal surgery Tracheotomy
Significance of Sleep Disordered Breathing Risk factor for stroke Risk factor for cardiac arrhythmias Risk factor for CAD and M.I. Risk factor for pulmonary hypertension and right heart dysfunction Cause of hypertension
Patient Scenario #2 A 40 year old man was referred because his wife complained that he kicked in his sleep and constantly disturbed her. The patient remembered awakening several times each night, but never noticed any discomfort at those times. He admitted that at bedtime he did have an irresistible urge to move his legs and he described a feeling of “pins and needles.” However this delayed his sleep only rarely. His Epworth Sleepiness Scale was 15/24 (sleepy). PSG shows: Periodic leg movements in sleep (PLMS) – 20% of these events were associated with arousals.
Periodic Leg Movement in Sleep (PLMS) PLMS are repetitive, stereotypic dorsiflexion movements of the toes, ankles, knees and thighs that recur at regular intervals. They occur most commonly in stages 1 and 2 but can occur less commonly in other stages. Patients are rarely aware of the leg movements themselves and complaints are usually from bed partners.
Periodic Leg Movement Disorder PLMD This is a syndrome of leg movements + symptoms (ie. insomnia or excessive daytime sleepiness. This is a polysomnographic diagnosis; but, it is often incorrectly used interchangeably with Restless Leg Syndrome. International Classification of Sleep Disorders Criteria for PLMS Severity SeverityPLM Index/HourPLM Arousal Index/Hr Mild5 - 24Not specified Moderate Not specified Severe> 50> 25/ hour
Restless Leg Syndrome (RLS) Characterized by abnormal and uncomfortable sensations in the limbs that compel the person to move to relieve the sensation and these movements are exacerbated by rest. The symptoms occur primarily in the evening or at night.
International RLS Study Group Criteria for Diagnosis of RLS Unpleasant limb sensations: desire to move the limbs usually associated with paresthesias/dysesthesias (abnormal/unpleasant sensations) Motor restlessness: patient is compelled to move Symptoms precipitated by rest and relieved by activity: symptoms are worse or exclusively present at rest (i.e., sitting or lying with at least partial and temporary relief by activity Symptoms worse in the evening or at night Sleep disturbance and consequences: difficulty initiating or maintaining sleep; less commonly, excessive daytime sleepiness Involuntary movements during wake or sleep (PLMS) Normal neurologic exam in primary RLS; in secondary forms, possible evidence of neuropathy Clinical course: onset any age, usually chronic and progressive, remissions may occur, can be exacerbated by or exclusively during pregnancy Family history: sometimes present; suggestive of autosomal dominant pattern Primary Features Associated Features
PSG : Quasi-periodic movements of the legs during wakefulness with a prolonged sleep latency. After sleep, PLMs are noted in 70 –90% of Patients PLMs RLS
Differential Diagnosis of RLS Neuropathy Claudication Painful toes and moving leg syndrome (lumbrosacral radiculopathy) Neuroleptic akathesia
Causes of RLS/PLMD Causes and associations of PLMs Any cause of RLS Withdrawal of anti-convulsant, barbiturates, hypnotics Associated with narcolepsy, OSA, CPAP titration Secondary RLS Fe deficiency anemia ESRD Pregnancy Medications -caffeine -TCA’s -SSRI’s -Dopamine blockers Primary RLS Cause unknown ? If there’s an abnormality in Fe (iron) transport into the CNS or a defect in the use of Fe as it relates to dopaminergic neurons.
Treatment options for RLS/ PLMs Nonpharmacologic-avoid etoh, caffeine, do light stretching, exercise, warm baths Dopaminergic agents (ie, Sinemet) -Treats PLMs and improves sleep quality Dopamine agonists Benzodiazepines Narcotics (usually reserved for severe cases)
Patient Scenario #3 A 30 year old woman was evaluated for excessive daytime sleepiness of 5 year duration. There was no history of snoring or observed apnea. The patient recalled having difficulty holding her head up when she laughed or was embarrassed. The patient’s husband reported that sometimes she kicked the covers at night. Rarely, the patient felt she could not move for a while as she was falling asleep at night.
Narcolepsy is related to abnormal regulation of REM sleep and inappropriate intrusion of REM sleep physiology into wakefulness Hypocretin/orexin (2 peptides) secreted by the hypothalamus and other brain areas. 2 major pathways: -hypothalamus cortex -hypothalamus Brain stem -locus ceruleus- NE secreting neurons important in maintaining wakefulness 7 of 9 patients with narcolepsy had low orexin levels in their CSF. Other studies have shown an absence of orexin- secreting neurons in the hypothalamus Antigen DQB1* 0602 is the most sensitive marker for narcolepsy across all ethnic groups
Narcolepsy is a Neurological Disorder Characterized by: PrevalenceSymptoms 100% 70% 66% 60% Excessive daytime sleepiness (EDS); sleep attacks Cataplexy-loss of muscle tone during periods of high emotion Hallucinations: Hypnagogic (dreaming at sleep onset)/hypnopompic (dreaming just after awakening) Sleep paralysis-loss of muscle tone at sleep onset or on awakening Disrupted nocturnal sleep Automatisms Pathognomonic Can be followed years later by the other SX’s
Narcolepsy Prevalence of disorder is % in the general population Adolescence is the common age of onset Second peak at about 40 years of age –(5% of cases start after age 50)
Secondary Narcolepsy Head Trauma Stroke MS Neurodegenerative Disorders Brain tumors CNS infections PSG Findings: Short REM Latency (low sleep efficiency) Sleep fragmentation; reduced slow wave sleep; +/- PLMs
Indications for a Multiple Sleep Latency Test (MSLT) Unexplained hypersomnolence (sleepiness); sleep apnea and other disorders. Narcolepsy: to confirm diagnosis and determine the severity before stimulant therapy. Insomnia with daytime sleepiness. Circadian rhythm disorders
MSLT Consists of 4-5 naps at 2 hour intervals conducted in the daytime commencing hours after waking from the PSG. A mean sleep latency of <5 minutes and 2 or more naps with REM sleep. Testing Scoring and Interpretation
Treatment of Narcolepsy Tx of Daytime Sleepiness Stimulants are working to increase the availability of NE/DA Largest doses should be given 1 – 2 hours before the periods of maximum sleepiness methylphenidate dextroamphetamine selegiline modafinil Tx of Cataplexy/Hallucinations TCA’s Venlafaxine (Effexor) Tegretol GHB (Xyrem) Sleep hygiene Optimizing the amount of sleep If able, regularly schedule naps during the day (if restorative)
Insomnia Patient Scenario #4 A 30 year old Female is referred for complaints of inability to sleep for more than 10 years. The patient reports it usually takes her 2 to 3 hours to fall asleep after going to bed. She also finds herself awakening 3 to 4 times during the night. She reports that it takes at least 30 minutes to fall back asleep after each awakening. Alcohol and over the counter medications sometimes helped. During the day, fatigue, but not definite sleepiness was noted. Her husband denied that she snores, kicks, or jerks during sleep.
Common Causes of Insomnia Psychophysiological Acute (adjustment sleep disorder) Chronic Idiopathic Sleep state misperception Sleep disorders (sleep apnea, PLMD, RLS) Psychiatric disorder(depression, panic attacks) Inadequate sleep hygiene Environmental sleep disorder Drugs (nicotine, ethanol, caffeine) Medical conditions/medications oFibromyalgia and chronic pain syndromes oCOPD and other respiratory disorders oMedications (beta blockers, theophylline) oCircadian disorders Delayed sleep phase syndrome Advance sleep phase syndrome Shift work or jet lag syndrome Primary Insomnia Secondary Insomnia
Insomnia History Nature and Duration of problem Sleep habits –Time in bed, lights out, sleep onset, wake time –Bedroom environment –Timing and duration of naps –Changes on weekends Effects of a new sleep environment (vacation) Medication/beverage history Symptoms of depression. History of leg jerks, restless leg syndrome, snoring, apnea
Diagnosis of the cause of Insomnia based on: Careful History Review of Patient’s sleep diary PSG: Typically normal and may not be beneficial unless there’s a suspicion of another underlying sleep disorder Or Insomnia is severe and doesn’t respond to empiric therapy.
Patient Scenario #4A -Same as previous patient. She averages 4 hours/night of sleep with EDS -On weekends able to sleep in and get 7 to 8 hours of sleep and awake feeling refreshed.
Sleep Disorders Associated with Alterations in Circadian Rhythm Delayed sleep phase syndrome Advance sleep phase syndrome Time zone change (jet lag) syndrome Shift work sleep disorder Irregular sleep wake pattern Non-24-hour sleep –wake disorder
Circadian rhythms are generated by an internal pacemaker in the suprachiasmatic nucleus (SCN) of the hypothalamus The main role of the SCN is to synchronize bodily functions with the light – dark cycle.