Thoracic outlet syndrome
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Transcript of Thoracic outlet syndrome
THORACIC OUTLET SYNDROME
Thoracic outlet syndrome (TOS)- a collection of symptoms brought about by abnormal compression of the neurovascular bundle by bony, ligamentous or muscular obstacles in the narrow space between clavicle and 1st rib.
ANATOMY
Interscalene triangle Med : 1st rib Ant : clavicle, scaleneus
anterior Post : scaleneus medius
Costoclavicular space Med : 1st rib Ant : clavicle Post : scaleneus
anterior Lat : costoclavicular
ligament, subclavius muscle
Subcoracoid tunnel
compressed by pectoralis minor tendon, head of humerus or coracoid process.
Subcoracoid tunnel
contents
Brachial plexus Subclavian artery Subclavian vein
Causes Cervical rib Long C7 transverse process Anomalous insertion of scalene muscles Scalene muscle hypertrophy Scaleneus minimus Abnormal bands, ligaments Fracture clavicle/ 1st rib Exostosis Tumours Brachial plexus trauma / diseases
Cervical rib
A cervical rib is a supernumerary (or extra) rib which arises from the seventh cervical vertebra.
Sometimes known as "neck ribs" Congenital abnormality located above the
normal first rib. A cervical rib is present in only about (0.2%) of
people. Half unilateral, common in right side. Usually asymptomatic
Types :
1) Completely bony
2) Completely fibrous
3) Combined
4) Bony swelling
Type 3 is most common. Type 3 – a band stretching from C7 vertebra to
Scalene tubercle on 1st rib. It elevates the neurovascular bundle compressing it in the interscalene triangle.
Cervical rib
Cervical rib
Clinical features
Most commonly seen in middle aged women Usually due to neural compromise.
Interscalene triangle
Artery , Nerves Scaleneus anticus syndrome
Costoclavicular space
Vein Edens syndrome
Subcoracoid area Artery, Vein , Nerves
Hyperabduction syndrome
Interscalene triangle
Costoclavicular space
Hyperabduction syndrome
Arterial compromise
Fatigue Weakness Coldness Upper limb claudication Thrombosis Paraesthesia Gangrene Raynaud's phenomenon due to thrombosis with
distal embolisation
Venous compromise
Edema Venous distension Collateral formation Cyanosis Paget-Schroetter syndrome – effort thrombosis
"Effort" axillary-subclavian vein thrombosis (Paget-Schroetter syndrome) is an uncommon deep venous thrombosis due to repetitive activity of the upper limbs.
Neural compromise
Paraesthesia Pain in shoulder, arm, forearm and fingers Occipital headache – referred from tight
scalene muscles Weakness of forearm, hand.
Clinical tests
Roos Test
Hold both arms in surrendering position (90°overhead with shoulders in external rotation) – reproduction of symptoms within 1 minute . Arm collapses if continued.
modified Roos test / Elevated Arm Stress Test(EAST)– same as above. Symptoms precipitated by opening and closing fists continuously.
Elevated arms stress test
Adson's (Scalene) Test
Radial pulse diminishes and disappears on turning chin to same side.
Decreases space between scaleneus anterior and medius .
Adsons test
Halsted's costoclavicular compression test
45° abduction and extension of arm with downward pressure on shoulders –neck turned to opposite side- reproduce symptoms
Exaggerated military position
Patient shrugs shoulders with deep inhalation while drawing the shoulders backward in an exaggerated military position – radial pulse diminishes.
Military position
Wright's hyperabduction test
Arm hyperabducted to 180°-diminishing radial pulse.
Neurovascular structures compressed in subcoracoid region by pectoralis minor tendon, head of humerus or coracoid process.
Wright's hyperabdution test
Tinel sign – in supra and infraclavicular region Phalens sign – in carpel tunnel syndrome (CTS)
Differential diagnoses
Carpel tunnel syndrome Spinal canal tumors Shoulder myositis Angina pectoris Raynaud's disease Ulnar nerve compression - epicondylitis
Investigations
Chest x ray, cervical spine x ray MRI, cervical myelography
r/o narrowing of intrevertebral foramen, disc compression.
Doppler , vascular imaging(angiogram/venogram) r/o aneurism, thrombosis
Nerve conduction study, electromyography confirm neurogenic TOS, localise the area of
compression- r/o CTS
Double crush syndrome – TOS with other peripheral sites of nerve compression(CTS)
Treatment
Non operative treatment
Posture improving exercises. Breathing exercises. Avoid aggravating activities. Avoid repetitive upper extremity mechanical
work and muscular trauma. Analgesics,muscle relaxants, antidepressants. Physiotherapy .
Surgical treatment
Indications: Symptoms persists with non operative
treatment. Associated vascular compression. Progression of neurological symptoms. Nerve conduction velocity < 60m/s
Trans cervical or trans axillary(Roos) resection of 1st rib often with release of scalene muscles.
Extraperiosteal excision of Cervical rib(to prevent its regeneration) .Often a cervical sympathectomy is also needed.
Roos approach
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