Tracheostomy

Tracheostomy is the surgical creation of an opening in the anterior wall of the trachea to establish an airway, communicating the tracheal lumen with the exterior. It is one of the oldest life-saving surgical procedures and a perennial NEET PG favourite — high-yield areas are indications, surgical anatomy (the level of incision), tube types, and the classic triad of complications (haemorrhage, surgical/subcutaneous emphysema, tube displacement).

Definition & terminology

• Tracheotomy = the act of making the incision in the trachea.
• Tracheostomy = creating an opening/stoma; when permanent, the tracheal mucosa is sutured to skin (end tracheostomy after total laryngectomy).
• Stoma = the resultant opening.

In NEET PG the two words are used interchangeably, but remember: after total laryngectomy the patient breathes permanently through an end stoma and there is no connection between the upper airway and the lungs — never attempt orotracheal intubation in such a patient during an emergency.

High-yield: A laryngectomee is a "neck breather." Resuscitation must be via the stoma, NOT the mouth/nose.

Classification

Tracheostomy is classified by timing, technique, and duration.

Basis	Types	Key points
Timing/urgency	Emergency, Urgent (elective on a struggling patient), Elective	Emergency tracheostomy is hazardous; cricothyrotomy is preferred in a crash airway
Technique	Open surgical, Percutaneous dilatational (PDT, Ciaglia), Mini-tracheostomy	PDT done bedside in ICU over a guidewire (Seldinger)
Level	High, Mid (standard), Low	High tracheostomy injures cricoid → subglottic stenosis (avoid)
Duration	Temporary, Permanent	Permanent after laryngectomy or irreversible bulbar palsy

Jackson's classification by level

• High tracheostomy – above the thyroid isthmus (1st ring). Avoided — risk of perichondritis of cricoid and subglottic stenosis. Only exception: carcinoma larynx where you must stay below tumour.
• Mid tracheostomy – through the isthmus or at 2nd–3rd ring (the standard operation).
• Low tracheostomy – below the isthmus (4th ring); deep, near great vessels and pleura → risk of pneumothorax and innominate artery erosion.

High-yield: The trachea is opened at the level of the 3rd and 4th tracheal rings in the standard elective tracheostomy. Avoid the 1st ring and the cricoid.

Surgical anatomy (very high-yield)

Structures encountered from skin to trachea (superficial → deep):

Skin → superficial fascia (with anterior jugular veins) → deep cervical fascia (investing layer) → strap muscles (sternohyoid, sternothyroid — separated in the midline raphe, the "bloodless plane") → pretracheal fascia → thyroid isthmus → trachea

Key relations:

• Thyroid isthmus overlies the 2nd–4th rings → it is retracted upward or divided/ligated.
• Inferior thyroid veins and the thyroidea ima artery (when present, in ~10%, arises from brachiocephalic/arch) lie in the lower midline → source of bleeding.
• Cricoid cartilage is the landmark for the upper limit.
• In children the trachea is soft, mobile and the dome of the pleura and large thymus rise into the neck → higher risk of pneumothorax and difficulty; cricothyrotomy is contraindicated in children <12 yr.

High-yield: In children the trachea is small, soft and mobile, the pleura ascends into the neck, and there is a relatively large thymus and brachiocephalic vessels crossing high — making paediatric tracheostomy technically far more difficult and dangerous.

Indications

A useful classification is into mechanical obstruction, secretion retention/access for ventilation, and prophylactic/airway protection.

1. Respiratory obstruction (upper airway)
   • Infective: acute epiglottitis, Ludwig's angina, laryngotracheobronchitis, diphtheria.
   • Trauma: laryngeal fracture, maxillofacial injury, inhalation/burns.
   • Neoplastic: carcinoma larynx/hypopharynx/tongue base.
   • Bilateral abductor (vocal cord) palsy — classically after thyroid surgery.
   • Congenital: laryngeal web, bilateral choanal atresia.
   • Foreign body (where it cannot be removed promptly).
2. Retained secretions / inability to clear airway
   • Coma, head injury, tetanus, bulbar polio, GBS.
   • Chest wall trauma (flail chest), aspiration.
3. Prolonged ventilatory support — to bypass the need for prolonged orotracheal intubation (reduces laryngeal injury, eases nursing, reduces dead space).
4. Elective, as part of major head & neck surgery (e.g., before commando/laryngectomy procedures).

Functions (why it helps)

• Bypasses upper airway obstruction.
• Reduces anatomical dead space by ~30–50% (≈ 150 mL → ~75 mL) → reduces work of breathing.
• Allows tracheobronchial toilet (suction).
• Protects the airway and permits positive-pressure ventilation via a cuffed tube.

High-yield: Tracheostomy reduces dead space by roughly 30–50%, decreasing the work of breathing — a frequently tested physiological benefit.

Emergency cricothyrotomy vs elective tracheostomy

This comparison is among the most examined points.

Feature	Cricothyrotomy (cricothyroidotomy)	Tracheostomy
Indication	"Can't intubate, can't oxygenate" crash airway	Elective/urgent, planned airway
Site	Through cricothyroid membrane	3rd–4th tracheal rings
Speed	Seconds–rapid, bedside	Slower, ideally in OT
Skill/equipment	Minimal	Surgical set, lighting
Age	Adults; avoid <12 yr (cricoid injury)	Any age
Main late complication	Subglottic stenosis	Tracheal stenosis at stoma
Duration	Temporary (convert to tracheostomy within 24–72 h)	Can be long-term

Crash airway flow: Failed intubation + failed BMV → call for help → attempt supraglottic device → if "cannot oxygenate" → surgical/needle cricothyrotomy → later convert to formal tracheostomy.

High-yield: In a true emergency, cricothyrotomy (through the cricothyroid membrane) is the procedure of choice, NOT emergency tracheostomy. Needle cricothyrotomy with jet insufflation is the emergency option in children <12 yr.

Surgical steps (elective, open)

1. Position: supine, neck extended with sandbag/roll under shoulders (extension brings trachea forward and superficial). Avoid hyper-extension in suspected cervical spine injury.
2. Incision: transverse (cosmetically better) midway between cricoid and suprasternal notch, OR vertical midline in emergencies (less bleeding, faster).
3. Separate strap muscles in the midline.
4. Retract or divide the thyroid isthmus.
5. Confirm trachea by palpating rings; infiltrate lignocaine into the lumen to suppress cough.
6. Tracheal opening: A vertical incision through 3rd–4th rings in children; in adults a Björk flap (inferiorly based flap sutured to skin) or a window — never excise cartilage in children (causes stenosis).
7. Insert appropriately sized tube, inflate cuff, confirm by end-tidal CO₂ / chest rise, secure with tapes (one finger loose).
8. Loose skin closure (tight closure → surgical emphysema).

High-yield: Björk flap = inferiorly based U-shaped tracheal flap sutured to the lower skin margin; facilitates tube reinsertion if accidental decannulation. Avoid in children (stenosis risk).

Types of tracheostomy tubes

Tube type	Features	Use
Cuffed	Balloon seals trachea	Positive-pressure ventilation; prevents aspiration
Uncuffed	No balloon	Long-term/paediatric; less mucosal damage
Fenestrated	Opening on posterior curve	Allows speech & weaning; airflow through larynx
Non-fenestrated	Solid	Standard
Single vs Double lumen	Inner cannula removable for cleaning	Double lumen preferred for hygiene
Metal (Jackson/Fuller's, Negus)	Non-cuffed, durable	Long-term permanent stoma
Portex / PVC	Disposable, with cuff	Standard hospital use
Montgomery T-tube	T-shaped silicone stent	Tracheal stenosis support

Cuff care: use high-volume, low-pressure cuffs; keep cuff pressure < 25–30 cmH₂O (ideally 20–25, below capillary perfusion pressure ~30 mmHg) to prevent tracheal mucosal ischaemia, ulceration and later stenosis.

High-yield: Cuff pressure must stay below tracheal mucosal capillary pressure (~30 mmHg) — over-inflation causes mucosal necrosis → tracheal stenosis/tracheomalacia.

Tube size note: outer diameter should be ~2/3 to 3/4 of the tracheal lumen. In children, uncuffed tubes are used and size is age-based (roughly internal diameter ≈ age/4 + 4 mm, mirroring ET tube sizing).

Complications

Classically divided into immediate (intra-operative), early (intermediate, within hours–days) and late.

Immediate (peri-operative)

• Primary haemorrhage (commonest immediate complication) — from anterior jugular/inferior thyroid veins, thyroid isthmus.
• Apnoea (from loss of hypoxic drive after sudden CO₂ washout).
• Pneumothorax / pneumomediastinum — especially in children (pleural dome high).
• Injury to recurrent laryngeal nerve, oesophagus (posterior wall), cricoid.
• Tube in a false passage / paratracheal placement.

Early / intermediate

• Surgical (subcutaneous) emphysema — from tight skin closure or tight packing; air tracks into tissues. Crepitus on palpation.
• Tube displacement / blockage by crusts or secretions — a true emergency, can be fatal.
• Secondary haemorrhage (infection-related, after a few days).
• Tracheitis, stomal infection, aspiration, atelectasis, lung collapse.
• Tube obstruction by crusting (humidification prevents this).

Late

• Tracheal stenosis — commonest late complication; at the stoma site or, more importantly, at the cuff site (mucosal pressure necrosis).
• Tracheomalacia — softening of cartilage from chronic pressure.
• Tracheo-oesophageal fistula (TEF) — cuff + nasogastric tube pressure erodes the party wall.
• Tracheo-innominate artery fistula (TIF) — rare, catastrophic; presents with a sentinel bleed then massive haemorrhage. Occurs when stoma is too low or tube tip erodes the brachiocephalic (innominate) artery. Hyperinflate cuff / digital compression (Utley manoeuvre) and rush to OT.
• Persistent tracheocutaneous fistula, problematic decannulation, granulation tissue, dysphagia, depressed scar.

High-yield: The triad of early complications = (1) primary haemorrhage, (2) subcutaneous/surgical emphysema, (3) tube displacement/blockage. Late "stenosis triad" = tracheal stenosis, tracheomalacia, TE fistula.

High-yield: A brisk pulsatile bleed weeks after tracheostomy = tracheo-innominate artery fistula until proven otherwise → over-inflate cuff/Utley digital pressure → emergency surgery. Mortality is very high.

Post-operative care

• Humidification of inspired air (the nose's warming/humidifying function is bypassed) — prevents crusting and tube blockage. Most important single measure.
• Regular suction (aseptic, brief, with pre-oxygenation).
• Inner tube cleaning, cuff pressure monitoring.
• Keep a spare tube, tracheal dilator (Trousseau) and same-size tube at the bedside.
• Chest physiotherapy; antibiotics if infected.
• First tube change is usually done after the tract is established (around 3–5 days, often day 5–7) by experienced staff — early dislodgement before tract maturation risks losing the airway into a false passage.

High-yield: Humidification is the most important post-tracheostomy care measure — the upper airway's air-conditioning role is bypassed, so dry air causes crust formation and life-threatening tube blockage.

Decannulation

Removal of the tube once it is no longer needed. Criteria (all should be satisfied):

1. Original indication resolved (obstruction relieved, secretions controlled, off ventilator).
2. Patient can breathe and cough effectively, maintains oxygenation, and protects airway.
3. Adequate cough/swallow reflexes, no significant aspiration.
4. Tube occlusion (capping) test tolerated — typically a fenestrated/smaller tube is corked for 24–48 hours with maintained saturations and comfortable breathing.
5. Patent upper airway confirmed (endoscopy if doubt — exclude stenosis/granulations).

Decannulation flow: Indication resolved → downsize tube → deflate cuff → fenestrated tube → cap (block) for 24–48 h → if tolerated, decannulate → cover stoma with occlusive dressing (usually closes spontaneously in days).

High-yield: Difficult decannulation in a child often points to granulation tissue/suprastomal granuloma or subglottic stenosis — evaluate endoscopically.

Key differentials & related decisions

• Tracheostomy vs prolonged endotracheal intubation: Tracheostomy is preferred when ventilation is expected to be needed beyond ~10–14 days; it reduces laryngeal injury, improves comfort, oral hygiene and weaning. Earlier in selected ICU patients.
• Tracheostomy vs cricothyrotomy: as tabled above (emergency = cricothyrotomy).
• Mini-tracheostomy: small uncuffed tube via cricothyroid membrane purely for suction/secretion clearance, not for ventilation.
• Stridor differentials prompting airway intervention: epiglottitis, croup, foreign body, bilateral abductor palsy, anaphylactic angioedema, retropharyngeal abscess.

Recently asked / exam angle

• Site of tracheostomy → 3rd & 4th tracheal rings (most repeated single-line fact).
• Emergency airway of choice / through cricothyroid membrane → cricothyrotomy; not done in children <12 yr.
• Most common immediate complication → primary haemorrhage; most common late → tracheal stenosis.
• Björk flap definition and purpose.
• Cuff pressure cut-off (<30 cmH₂O / keep below mucosal capillary pressure).
• Tracheo-innominate fistula — sentinel bleed, Utley manoeuvre, low-set tube.
• Dead space reduction percentage.
• Most important post-op care → humidification.
• High tracheostomy avoided because → subglottic stenosis / cricoid perichondritis.
• Laryngectomee resuscitation through the stoma, not the mouth.
• Image-based: identifying the cricothyroid membrane, thyroid isthmus, tube types (fenestrated vs cuffed).

Rapid revision

1. Standard tracheostomy opens the trachea at the 3rd–4th rings; high (1st-ring) tracheostomy is avoided → subglottic stenosis.
2. Emergency airway = cricothyrotomy through the cricothyroid membrane; convert to formal tracheostomy within 24–72 h.
3. Cricothyrotomy contraindicated in children <12 yr → use needle cricothyrotomy with jet ventilation.
4. Order of structures: skin → fascia → strap muscles → thyroid isthmus → trachea.
5. Björk flap = inferiorly based tracheal flap sutured to skin; never excise cartilage in children.
6. Tracheostomy reduces dead space by 30–50%.
7. Keep cuff pressure < 25–30 cmH₂O (below mucosal capillary pressure) to prevent stenosis/tracheomalacia.
8. Most common immediate complication = primary haemorrhage; early triad = haemorrhage, surgical emphysema, tube displacement.
9. Most common late complication = tracheal stenosis (cuff/stoma site); also tracheomalacia and TE fistula.
10. Tracheo-innominate artery fistula → sentinel bleed, then exsanguination; Utley digital compression + cuff hyperinflation + emergency surgery; suspect a low-placed tube.
11. Humidification is the single most important post-operative measure; first tube change around day 3–7 after tract matures.
12. Decannulation: indication resolved + good cough/swallow + tolerate capping for 24–48 h; a laryngectomee is a permanent neck breather — resuscitate via the stoma.