Anesthesia for Total Laryngectomy in Carcinoma Larynx


!! Case Presentation & Pre-Operative Assessment
''What are the presenting complaints and history of this 55-year-old male patient?'' The patient presented with hoarseness of voice for 2 years (insidious onset, progressive) and noisy breathing for 3 months, associated with shortness of breath (NYHA Grade III). He underwent a vocal cord biopsy and tumor debulking under general anesthesia 1 month prior, which subsided the noisy breathing. He is a known smoker (8 pack-years, stopped 2 weeks back) and chronic alcoholic (stopped 2 months back). He is a de-novo hypertensive on Telma-H (Telmisartan + Hydrochlorothiazide).
''What are the relevant findings from the patient's physical examination and investigations?'' Examination revealed a moderately built, nourished patient with a pulse rate of 76/min, BP 140/90 mmHg, and SpO2 of 98% on room air. His BMI is 21.4 kg/m². Airway assessment showed a mouth opening of 3 fingers, adequate MP grade, and normal neck movements. Rigid video laryngoscopy revealed an exophytic growth involving the right true vocal cords. Investigations: Hb 15 g%, elevated WBC (17,500), normal RFT/LFT, ECG normal, 2D echo EF 60%. CECT neck showed a soft tissue density lesion involving glottic and supraglottic regions with extension to the thyroid cartilage.
''What does the term 'total laryngectomy' mean, and what are its indications?'' Total laryngectomy is the surgical removal of the complete laryngeal structures, including the epiglottis, hyoid, and a part of the upper trachea, with the creation of a permanent tracheostome. A part of the total thyroid gland may also be removed. It is generally indicated for T4a or T4b tumors.
''What is the TNM classification for laryngeal cancer?'' - **T (Primary Tumor):** T1 (tumor limited to subglottis), T2 (tumor extends to vocal cords with normal mobility), T3 (tumor extends to larynx with fixed vocal cord mobility), T4a (tumor extends beyond larynx to cartilage), T4b (tumor extends to prevertebral space or carotid artery). - **N (Regional Lymph Nodes):** N0 (no involvement), N1 (single ipsilateral <3cm), N2 (single ipsilateral 3-6cm), N2b (multiple ipsilateral <6cm), N2c (bilateral/contralateral <6cm), N3 (>6cm). - **M (Distant Metastasis):** M0 (no), M1 (present).
''What is the significance of hoarseness of voice and stridor in this patient?'' Hoarseness of voice and stridor indicate involvement of the vocal cords. The patient's stridor is inspiratory, typically seen in obstructive lesions *above* the vocal cords. Differential diagnoses for hoarseness include inflammatory conditions (chronic laryngitis), structural deformities (polyps, nodules), neuromuscular disorders (Parkinson's, multiple sclerosis), and vocal cord paralysis.
''Why is a history of previous radiotherapy significant?'' Previous radiotherapy is a concern because it can cause radiation-induced fibrosis, leading to stiffness, reduced neck mobility, trismus, laryngeal edema, and a "frozen larynx" (fixed vocal cords). All these factors contribute to an anticipated difficult airway.
''What are the ill-effects of smoking and the advantages of its cessation?'' Smoking introduces gaseous (carbon monoxide) and particulate (nicotine) forms. CO increases carboxyhemoglobin, shifting the ODC to the left and reducing oxygen delivery. Nicotine stimulates the sympathetic system. Cessation benefits: 48-72 hours (carboxyhemoglobin normalizes, ciliary function improves), 1-2 weeks (decreased sputum), 4-6 weeks (PFTs improve), 8-12 weeks (reduced post-op morbidity), and >6 months (risk of pulmonary complications equals that of a non-smoker).
''Are pulmonary function tests (PFTs) relevant in this patient?'' No, PFTs are not very useful or accurate in these cases due to the mechanical obstruction of the glottic inlet, which prevents the patient from performing the test adequately. Dynamic assessment using metabolic equivalents (METS) is preferred; patients with >4 METs are considered ideal.

!! Intra-Operative Management & Anesthetic Concerns
''What are the five key questions an anesthesiologist must ask before anesthetizing this patient?'' 1. Will I be able to preoxygenate the patient? 2. Will I be able to use face-mask ventilation? 3. Will I be able to get a good view of the cords? 4. Will I be able to intubate the patient? 5. Will I be able to get easy front-of-neck access?
''How do you pre-oxygenate a patient with laryngeal carcinoma?'' Preoxygenation can be achieved using high-flow nasal oxygen (HFNO), CPAP if available, or a "no-desat" approach using nasal prongs with a conventional face mask. Transnasal Humidified Rapid-Insufflation Ventilatory Exchange (THRIVE) is also a valuable technique. Positioning the patient comfortably is crucial.
''Is pre-operative tracheostomy advised, and why?'' No, pre-operative tracheostomy is generally avoided. Reasons include the need for a longer disease-free tracheal segment for stomal creation to prevent stomal recurrence, poor wound healing in a potentially irradiated field, and the risk of bleeding from major arteries in a scarred, fibrotic area.
''What are the ideal monitors and preparations for this surgery?'' In addition to standard ASA monitors (NIBP, ECG, pulse oximetry), invasive arterial blood pressure monitoring is recommended. Other preparations include: large-bore IV access, temperature monitoring (nasopharyngeal probe), urine output monitoring, long breathing circuits and gas sampling tubes, and active patient warming with warm IV fluids.
''What is the ideal muscle relaxant for intubation in carcinoma larynx?'' Rocuronium is often considered ideal due to its rapid onset and the availability of sugammadex for reversal if multiple attempts or a "cannot intubate, cannot ventilate" (CICV) situation arises. Succinylcholine is an alternative due to its short duration, but rocuronium offers more control in difficult airway scenarios.
''What is the best device for intubation in such cases?'' A hybrid approach using both a video laryngoscope and a fiberoptic bronchoscope is often ideal. The video laryngoscope provides a clear pathway and lifts soft tissues, while the fiberoptic scope can navigate beyond the growth. Awake fiberoptic intubation is risky as the scope can act as a "cork in the bottle," completely obstructing the narrowed lumen. The comfort and skill of the anesthesiologist with the chosen device are also paramount.
''What type of endotracheal tube is preferable, and how is its size assessed?'' A flexometallic (armored) tube is preferable as it prevents kinking during surgery. Tube size can be assessed pre-operatively using rigid video laryngoscopy findings, CT scan measurements of the obstruction, or ultrasonography to measure the distance between the vocal cords.
''Is bag-mask ventilation (BMV) possible in these patients?'' BMV can be difficult if the glottic inlet is nearly closed. If BMV is impossible, the anesthesiologist must immediately proceed to the next step in the difficult airway plan, which could be an alternative intubation technique or front-of-neck access.
''How do you prepare for a potential front-of-neck access (FONA)?'' Preparation involves assessing for any neck scars or history of neck surgeries. The ideal FONA plan should be pre-determined (e.g., cricothyroidotomy vs. tracheostomy). The cricothyroid membrane should be identified, the midline marked, and local anesthetic infiltrated.
''What is the ideal anesthetic technique for maintenance?'' Total Intravenous Anesthesia (TIVA) is ideal for maintenance. If inhalational agents are used, anesthetic gases will leak through the surgical stoma once created, making it difficult to maintain an adequate depth of anesthesia and causing operating room pollution.
''What are the key steps after the larynx is separated?'' After laryngeal separation, thorough suctioning is performed. The original endotracheal tube is withdrawn under vision, and a new flexometallic tube (e.g., 8 mm) is inserted directly into the tracheal stoma and secured to the chest wall with sutures.

!! Post-Operative Care & Special Considerations
''How is post-operative pain managed in these patients?'' Multimodal analgesia is employed, including IV NSAIDs (e.g., paracetamol), low-dose morphine, patient-controlled analgesia (PCA), or transdermal patches. A superficial cervical plexus block can also be considered for effective post-operative pain relief.
''What are the key components of post-operative tracheostomy care?'' Key components include: thorough suctioning with a catheter no more than 2/3 the diameter of the tube, humidification of inspired gases, regular inner cannula care, cuff pressure monitoring, stomal cleaning, and dressing changes.
''What is the role of a nasogastric tube (NGT) in the post-operative period?'' An NGT is typically placed after intubation to facilitate early enteral feeding (usually within 24 hours post-surgery), as the patient will have difficulty swallowing immediately after total laryngectomy.
''What are the components of an ERAS (Enhanced Recovery After Surgery) protocol for laryngectomy?'' ERAS components include pre-operative nutritional assessment, early post-operative enteral feeding (<24 hours), early mobilization, meticulous stoma care, chest physiotherapy and suctioning, removal of indwelling catheters within 24 hours, and thyroxine replacement if the thyroid gland was removed. There are no formal, comprehensive ERAS guidelines specifically for laryngectomy patients.
''How would you manage a post-laryngectomy patient presenting for another surgery or emergency?'' First, assess for the presence of a stoma. If a stoma is present, it indicates a total laryngectomy. Preoxygenate and ventilate through the stoma using a pediatric face mask. Intubation can be achieved with an armored tube, a microlaryngeal tube (MLT), or a Montgomery tube placed directly into the stoma. If no stoma is present (partial laryngectomy), conventional bag-mask ventilation and oral intubation with a small ETT may be possible.
''What are the key considerations when lasers are used in laryngeal surgery?'' The primary concern is an airway fire. Precautions include using laser-safe endotracheal tubes (e.g., Laser-Shield II, Montand tube) and minimizing FiO2. Hazards include laser plumes causing atmospheric contamination, pneumonitis, and gas embolism. A clear airway fire protocol must be in place.
''What is the airway fire protocol?'' In the event of an airway fire: 1. Remove the source of fire (stop laser). 2. Stop ventilation and disconnect the breathing circuit. 3. Flood the airway with water or saline (using a 50 ml syringe) and remove the burning ETT. 4. Re-ventilate with 100% oxygen via mask. 5. Perform laryngoscopy and rigid bronchoscopy to assess damage and remove debris. 6. Re-intubate or perform a tracheostomy if required.
''Why is a team approach important in these surgeries?'' A team approach is vital because the airway is shared with the surgeon. It facilitates clear communication, anticipation of a difficult airway, coordinated strategy implementation in a crisis (e.g., failed intubation), and the surgeon can assist with front-of-neck access if needed.
''What are the anesthetic considerations for a diagnostic biopsy of a laryngeal growth?'' This is a high-risk procedure. Options include: - **Ketamine:** Preserves airway reflexes and muscle tone but may increase bleeding. - **Total IV Anesthesia (TIVA):** Allows for rapid control. - **Local Anesthesia with Spray/Blocks:** Can be done but the anesthesiologist must be prepared for sudden airway obstruction from bleeding, edema, or laryngospasm. Post-biopsy laryngeal edema can worsen obstruction, requiring management with steroids or racemic epinephrine. Senior anesthesiologist involvement is crucial due to the high risk of catastrophe.

!! Interactive MCQ Discussion
''Intrinsic muscles of the larynx are supplied by the recurrent laryngeal nerve, EXCEPT for which one?'' The cricothyroid muscle. It is supplied by the external branch of the superior laryngeal nerve.
''Calculate the pack-years for a patient who smokes 20 cigarettes per day for 20 years.'' 20 pack-years. (Number of packs smoked per day x number of years). 20 cigarettes equal one pack, so 1 pack/day x 20 years = 20 pack-years.
''What is the most common cause of pre-operative anemia in carcinoma larynx patients?'' Iron deficiency anemia.
''What is the ideal device for intubating a patient with carcinoma larynx?'' A hybrid approach using both a video laryngoscope and a fiberoptic bronchoscope is considered ideal by many experts, as it combines the benefits of visualization and navigation. However, the device the anesthesiologist is most comfortable with is the best choice.
''Which of the following factors increase the risk of laryngospasm during anesthesia?'' Laryngeal edema and airway instrumentation (especially in lighter planes of anesthesia). Deep anesthesia decreases the risk.
''A patient with a history of laryngeal cancer and radiation therapy is undergoing surgery. What is a key anesthetic consideration?'' The patient may have laryngeal fibrosis or scarring, leading to a potentially difficult airway.
''What is the ideal tracheal tube after creating a stoma?'' A Montand tube is often cited as ideal, especially if laser is involved. However, any tube (flexometallic, armored) can be placed directly into the stoma under vision.

!! Concluding Remarks & Closing
''What are the final takeaways from this session?'' The session successfully covered the complex perioperative management of a patient undergoing total laryngectomy. Key concepts include meticulous pre-operative assessment for difficult airway, strategic intraoperative planning (including induction technique, device selection, and team communication), and comprehensive post-operative care. The discussion highlighted the importance of adapting guidelines to individual patient needs and the value of senior guidance in high-risk cases.