obstructive sleep apnea babak saedi.m.d imam khomeini hospital
TRANSCRIPT
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Obstructive Sleep ApneaObstructive Sleep Apnea
Babak Saedi .M.D
Imam Khomeini Hospital
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What is OSA?What is OSA?
Disorder of obstructed breathing occurring during sleep
Apnea: cessation of breathing with respiratory effort lasting greater than 10s
Hypopnea refers to a greater than 50% reduction in air flow
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Epidemiology of OSAEpidemiology of OSA
Prevalence - 2% in women, 4% in men In the elderly, estimates range from 28% to
67% in men and 20% to 54% in women two thirds are obese
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Why is it so Important?Why is it so Important?
Hypertension 25% of hypertensives have OSA (AI>5) Sleep Heart Health Study
6000 patients corrected for bmi, neck, EtOH• Nieto, et al. JAMA 283 (14): 1829-36, April 2000
SDB (including snoring) and Htn correlate 1700 patients
• Bixler, et al Arch IM 160 (15): 2289-95, 2000 Sleep 1980; 3: 221-4 BMJ 1987; 294: 16-19
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Health ImpactHealth Impact
MI REI >20 independent predictor of MI
223 German males with angio confirmed CAD• Schafer, et al. Cardiology 92(2): 79-84, 1999
Increased mortality in CAD patients 5 y study (Sweden)-62 patients; 19 with OSA (RDI
17)• OSA mortality: 37.5%; Non-osa mortality: 9.3%• Peker, et al. Am J Resp Crit Care 162 (1): 81-6, 7/2000
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Health ImpactHealth Impact
CVA REI severity is independent predictor of Stroke
128 patients (UM)- 75 stroke; 53 TIA 62.5% with AHI >10 with stroke vs 12% controls
• Bassetti, C et al. Sleep 22(2): 217-23, 3/1999
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Health ImpactHealth Impact Death
AI<20, at 8y follow-up: 4% mortality AI>20, at 8y follow-up: 37% mortality treatment with trach or CPAP: 0% mortality
Chest 1988; 94: 9-14
NCSDR 1993 38000 CV deaths related to OSA per year
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Societal ImpactSocietal Impact
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2006 American Academy of Sleep Medicine
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Societal ImpactSocietal Impact Increased Traffic Accidents
simulated driving: SDB ~100x more likely to drive off the road Acta Otolaryn 1990; 110: 136ff
7x increased risk of auto accidents Clin Chest Med 1992; 13: 427-34
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PATENT Vs COLLAPSED AIRWAYPATENT Vs COLLAPSED AIRWAY
2006 American Academy of Sleep medicine
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How’s it Diagnosed?How’s it Diagnosed?
History, Physical Examination, and Sleep Study
History Disrupted sleep, restless sleep, awaken with
gasping and choking Loud snoring Tired, inappropriate falling asleep Witnessed apneas
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Who gets it?Who gets it?
Men who snore and who are overweight
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adenotonsillar hypertrophy
nasal obstruction hypothyroidism acromegaly Down syndrome sedative use Alcohol Smoking
micrognathia retrognathia Obesity Neck circumference vocal cord paralysis H&N masses
Risk factors
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HistoryHistory Associated Complaints
Weight changes Thyroid/Growth
Hormone abnormalities GERD
Habits sleep schedule EtOH
PMH/Meds Hypertension Sedatives;
Antihistamines
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SITUATION CHANCE OF DOZING
Sitting and reading
Watching TV
Sitting inactive in a public place (e.g a theater or a meeting)As a passenger in a car for an hour without a breakLying down to rest in the afternoon when circumstances permitSitting and talking to someone
Sitting quietly after a lunch without alcoholIn a car, while stopped for a few minutes in traffic
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Physical ExamPhysical Exam Height and Weight (BMI)
BMI=[703.1 x weight(pounds)] / [Height (in)2] neck size Face-retrognathia Nose Oral cavity- palate, uvula, tonsils/pillars,
tongue, occlusion
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OBESITYOBESITY
Strongest risk factor for OSA
Present in > 60% of patients referred for
a diagnostic sleep evaluation
Wisconsin Sleep Cohort Study A one standard deviation difference in BMI was
associated with a 4-fold increase in disease prevalence
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ObesityObesity
Alters upper airway mechanics during sleep1. Increased parapharyngeal fat deposition:
neck circumference: > 17” males
> 16” females
With subsequent:
smaller upper airway
increase the collapsibility of the pharyngeal airway
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obesityobesity
2. Changes in neural compensatory mechanisms that maintain airway patency:
diminished protective reflexes which otherwise
would increase upper airway dilator muscle activity to maintain airway patency
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obesity obesity
3. waist circumference
Fat deposition around the abdomen produces
reduced lung volumes (functional residual capacity) which can lead to loss of caudal
traction on the upper airway
low lung volumes are associated with diminished oxygen stores
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Physical ExaminationPhysical Examination
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Evaluation Evaluation thyroid function tests
Poly somnography is the gold standard
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History and physical examination identify only 52% of OSA patients, with a specificity of 70%
Clinic of North America 1999
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Fiberoptic NasopharyngolaryngoscopyFiberoptic Nasopharyngolaryngoscopy Determines level of
obstruction Provides estimate of degree
of obstruction Technique
supine (i.e., in a sleeping position)
at FRC-point of maximal relaxation
snore maneuver Mueller maneuver- inspire
against a closed airway
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UpToDate
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How To Treat?How To Treat?
Minimal intervention Drop the Weight!
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Continuous Positive Airway Pressure (CPAP)Continuous Positive Airway Pressure (CPAP)
Continuous Positive Airway Pressure pneumatically splints open the patient’s airway during sleep by delivering pressurized air into the throat
Effective at eliminating apneas and hypopneas
Considered the gold standard in the treatment of OSA
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CPAP Side EffectsCPAP Side Effects
Despite its high efficacy, patients frequently cannot tolerate its usage every night for life and thus long-term acceptance has been found to be low (~50%)
Side effects: Oronasal dryness
Conjuctivitis from air leak
Noise
Claustrophobia
Mask discomfort
Skin abrasions/rash
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Appliance DesignAppliance Design Patients find appliances that
encroach the tongue space and open the bite uncomfortable
No differences in efficacy between greater or lesser mandibular opening in reducing AHI
No difference in treatment success between 1-piece and 2-piece appliances
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Oral Appliance TherapyOral Appliance Therapy There are no strict guidelines in
the design of oral appliances for OSA management and there is a plethora of them in use
There are 1-piece or 2-piece appliances made from soft elastomeric material or hard acrylic
2-piece appliances have the advantage of allowing for titratable mandibular advancement
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Surgical Treatment OptionsSurgical Treatment Options
Septoplasty Turbinoplasty Partial turbinectomy Polypectomy Excision of nasal tumours Adenoid tonsils excision Uvulopalatopharyngoplasty Tonsillectomy Uvulectomy
Partial glossectomy/tongue base reduction
Genioglossal advancement Lingual tonsils excision Hyoid
advancement/suspension Maxillomandibular
advancement Excision of laryngeal
tumours Tracheotomy
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SurgerySurgery
Tracheotomy An incision in the trachea Cures OSA nearly 100% of the time Prior to 1980, it’s all we had; still useful for
severe apneics
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Which Surgical Treatment Option?Which Surgical Treatment Option?
When an obvious anatomical abnormality is detected, the appropriate surgical procedure is performed accordingly
Unfortunately, even with sound imaging modalities, it is still difficult to ascertain the pathophysiology of OSA
It is often a combination of multiple sites affecting the upper airway that contribute to OSA
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Nasal Reconstruction ?
The Journal of Craniofacial Surgery & Volume 21, Number 6, November 2010
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Remove Tissue- Uvulopalatopharyngoplasty(UPPP)
Remove Tissue- Uvulopalatopharyngoplasty(UPPP)
First successful alternative to tracheotomy 12 individuals
preop AI 54 +/- 28 postop AI 28 +/- 28 8/12 with post-op AI<20
• Fujita et al. Otolaryngol HNS 1981; 89:923-34
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Remove Tissue-Other SurgeriesRemove Tissue-Other Surgeries
Laser Midline Glossectomy
Palatal Somnoplasty LAUP Radiofrequency tongue
base reduction Woodson, et al, AAO
2000, Washington DC 18 patients completed
protocol, average 15,696 J• REI decreased from 45.3
to 33.3
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UPPP has been considered to be effective only in approximately 50% of patients with OSA
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Enlarge the Bony Space-Other SurgeriesEnlarge the Bony Space-Other Surgeries
Genioglossus Advancement/ Hyoid Repositioning Success ~80% (11-18mm) Less effective with RDI >60
Maxillo-mandibular Advancement Particularly useful in the
setting of hypopharyngeal obstruction (Fujita 2 or 3)
Best results when performed following “Stage 1” surgery
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Maxillomandibular AdvancementMaxillomandibular Advancement
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Palatal ExpansionPalatal Expansion RPE treatment widens the
maxillary bone via distraction osteogenesis at the midpalatal suture
Increases the volumetric space of the nasal cavity, which helps reduce nasal resistance
Promotes spontaneous repositioning of the tongue to a normal position
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Which Surgical Treatment Option?Which Surgical Treatment Option?
Retropalatal and retroglossal openings are common areas that are obstructed in the upper airway
Maxillomandibular advancement has been shown to be very successful at treating OSA with retropalatal and retroglossal obstructions
However, some believe that maxillomandibular advancement is too invasive and should only be performed following a poor response to a procedure involving uvulopalatopharygoplasty, genioglossal advancement, and hyoid suspension
These clinicians argue that it would be overly aggressive to submit a patient who would have responded to a less invasive surgery to the risks/complications from maxillomandibular advancement
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What is Successful Treatment?What is Successful Treatment? In surgical studies, the definition of success
is mainly based on objective measures Common objective parameters are the
apnea-hypopnea index and lowest oxygen saturation
Current accepted definition for surgical cure: AHI less than 20 with a reduction greater
than 50% Few desaturations less than 90%
Reason for setting the success less than 20 is that several studies have found that an index >20 translates to increased morbidity and mortality
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Risks of Surgical TreatmentRisks of Surgical Treatment
Surgery in the upper airway results in postoperative edema, which has acute adverse effects on breathing
Several medications used during surgery are respiratory depressants and can remain in the body in low amounts for hours/days
OSA can be dangerously aggravated by these drugs thus these patients need prolonged monitoring following surgery
There is also a concern with postoperative analgesics that are respiratory depressants
Other complications: nerve damage, excessive bleeding
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2006 American Academy of Sleep Medicine
Sleep ApneaSleep Apnea
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Otherwise snore and this will happen to you….
Otherwise snore and this will happen to you….
Or sleep alone….
www.corbett.com.au