trachea and esophagus ehab zayyan, md, phd. trachea cartilaginous and membranous tube starts from...
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Trachea and esophagus
Ehab ZAYYAN, MD, PhD
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Trachea
• Cartilaginous and membranous tube• Starts from the lower border of the cricoid cartilage (6 th
cervical vertebra)
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• In adults the trachea is
about 11.25 cm long and 2.5 cm in diameter
• Ends at the (Carina) by dividing into two main bronchi at the level of the sternal angle (opposite to 4th and 5th thoracic vertebrae)
• Consists of 16- 20
incomplete cartilage rings (U- shaped)
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• The fibroelastic tube is kept
patent by the presence of U-shaped cartilaginous bar (rings) of hyaline cartilage embedded in its wall. The posterior free ends of the cartilage are connected by smooth muscle, the trachealis muscle.
• The mucous membrane of the trachea is lined with pseudostratified ciliated columnar epithelium and contains many goblet cells and tubular mucous glands.
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Anterior relations of the trachea• Skin• Fascia • Sternothyroid and
sternohyoid muscles• Isthmus of the thyroid• Inferior thyroid veins• Jugular arch• Thyroid ima artery• Left bracheoceohalic
vein
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Posterior relations
• Right and left recurrent laryngeal nerves
• Esophagus• Vertebral column
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Lateral relations
• Thyroid gland lateral lobes• Carotid sheath
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Trachea in the neck
Blood supply• The upper two
thirds is supplied by the inferior thyroid arteries and the lower third is supplied by the bronchial arteries.
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Lymphatic drainage
• pretracheal and paratracheal lymph nodes
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Nerve supply vagus, recurrent laryngeal, sympethatic trunk
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Esophagus
• Muscular tube
• 25 cm long
• From the pharynx to stomach
• Begins at the level of the cricoid cartilage, 6th cervical vertebra
• It descends in the midline slightly to the left.
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Relations of the esophagus in the neck
• Anterior: trachea and RLN• Posterior: prevertebral fascia and vertebral column• Lateral: lobes of the thyroid and carotid sheath
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Esophagus in the neck
• Blood supply: inferior thyroid arteries and veins
• Lymph: deep cervical lymph nodes
• Nerves: RLN and sympathetic trunks
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Midline structures in the neck
• Symphysis menti• Submental triangle• Body of the hyoid bone: at the level of 3rd cervical
vertebra• Thyrohyoid membrane• Upper border of thyroid cartilage: level of 4th cervical
vertebra• Cricothyroid ligament• Cricoid cartilage: level of 6th cervical vertebra• Cricotracheal ligament• First ring of trachea• Isthmus of the thyroid gland• Thyroid ima artery• Jugular arch• Suprasternal notch
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• In young children, the thymus gland may extend above the suprasternal notch as far as the isthmus of the thyroid gland, and the brachiocephalic artery and the left brachiocephalic vein may protrude above the suprasternal notch.
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• Symphysis menti• Submental triangle• Hyoid bone body • Thyrohyoid membrane• Thyroid cartilage • Cricothyroid ligament• Cricoid cartilage • Cricotracheal ligament• First ring of trachea• Thyroid gland isthmus• Thyroid ima artery• Jugular arch• Suprasternal notch
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Compromised airways
Top Emergency !!!!!
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Resuscitation
A: Airways
B: Breathing
C: Circulation
D: Drugs
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Upper respiratory airways
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Urgent airways management
1. Endotracheal intubation
2. Cricothyroidotomy
3. Tracheostomy
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Anatomic axes for endotracheal intubation
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Cricothyroidotomy
• Performed in top urgent situations
• When endotracheal intubation is impossible
• When there is no time even for tracheostomy
• Incision is made through the skin, fasciae and cricothyroid membrane and a tube is inserted
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Complications of cricothyroidotomy
• Esophageal injury (young children!!)
• Larynx injury
• Hemorrhage
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Tracheostomy
• The history of tracheotomy refers to 200 years BC
• In 1800 the most common indication was laryngeal diphtheria
• Infectious causes of tracheotomy are decreasing while congenital causes are increasing
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1966Karakoçan, Elazığ
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Indications of tracheotomy
• Upper respiratory airway obstruction
• Pulmonary care
• Long ventilation
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Upper respiratory airway obstruction
Congenital
• Craniofacial anomalies
• Laryngeal anomalies
• Bilateral vocal cord paralysis
• Tracheal anomalies
• Lymphatic anomalies
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Upper respiratory airway obstructionAcquired
• Infectious - croup - trachitis- epiglottitis- diphteria- deep neck infections
• Trauma - intubation- external trauma- corrosive substance- Burns- F.B
• Tumors- Papillomatosis- Hemangioma- OSAS
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Pulmonary care
• Aspiration (IX or X paralysis)
• Laryngeal cleft
• Tracheoesophageal fistula
• Insufficient cough reflex (hypotonia, CP)
• Chronic infections
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Long term ventilation
• Respiratory distress syndrome• Muscle weakness• Congenital heart diseases• Thorax trauma• Central respiratory insufficiency (intoxication..)
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Surgical technique
• Urgent vs elective
• In urgent cases intubate if possible, and then tracheotomy
• General anesthesia and operation room.
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Extension of the neck
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• Midline vertical incision• Horizontal incision • Stay in the midline• Thyroid isthmus ligation• High or low (above/below the ishmus)• Thru 2nd, 3rd, or 4th ring
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Sutures
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Vertical incision in 3,4,5
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Complications
• Organ injury (larynx, esophagus..)
• Nerve injury
• Hemorrhage (ant jugular veins, thyroid arteries)
• Pneumothorax
• …..
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