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RSACP wishes to inform that it shall be discontinuing the dispatch of print copy of JOACP to it's Life members. The print copy of JOACP will be posted only to those life members who send us a written confirmation for continuation of print copy.
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Table of Contents
COMMENTARY
Year : 2014  |  Volume : 30  |  Issue : 2  |  Page : 172-173

Best of both worlds-endotracheal intubation without paralysis


1 Assistant Professor, Department of Anesthesiology and Critical Care Medicine, Hospital of the University of Pennsylvania, Philadelphia, Pennysylvania, USA
2 Department of Anaesthesiology, Post Graduate Institute of Medical Education and Research (PGIMER), Chandigarh, India

Date of Web Publication9-Apr-2014

Correspondence Address:
Basavana G Goudra
3400 Spruce Strett, 680 Dulles, Hospital of the University of Pennsylvania, Philadelphia, Pennysylvania, 19104
USA
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Source of Support: None, Conflict of Interest: None


PMID: 24803751

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How to cite this article:
Goudra BG, Singh PM. Best of both worlds-endotracheal intubation without paralysis. J Anaesthesiol Clin Pharmacol 2014;30:172-3

How to cite this URL:
Goudra BG, Singh PM. Best of both worlds-endotracheal intubation without paralysis. J Anaesthesiol Clin Pharmacol [serial online] 2014 [cited 2020 Aug 8];30:172-3. Available from: http://www.joacp.org/text.asp?2014/30/2/172/130002

The current issue of JOACP contains an interesting paper ''Transtrachel Lidocaine: An Alternative to Intraoperative Propofol Infusion When Muscle Relaxants Are Not Used". [1] In the present era of rising healthcare costs, any new technique that provides high quality of anesthesia without adding to the expenditure is a welcome move. In fact, the study describes a technique that can potentially reduce the costs - both direct and indirect. The direct costs involve savings in terms of medications used (lower amount of propofol, avoidance of muscle relaxants) and indirect costs are avoidance of complications associated with skeletal muscle relaxants. Obviously, the patients need to be adequately anesthetized before attempting endotracheal intubation. We have more than one way to achieve this.

A large proportion of " Monitored anaesthesia care (MAC) requirement" probably goes toward suppressing the response to endotracheal intubation and later "tube tolerance." Muscle relaxation for the sole purpose of tolerating the tube is unnecessary once sufficient MAC is provided to achieve unconsciousness. However, not many of us know how to intubate/anesthetize without muscle relaxants. Since Griffith and Johnson [2] reported the first clinical use of skeletal muscle relaxants, we have come a long way. Many of our residents even think that muscle relaxation is one the requirements for general anesthesia. However, we have innumerable situations (surgeries and procedures), where in muscle relaxation is unnecessary except, may be to facilitate endotracheal intubation. Most of nonabdominal and nonthoracic surgeries fall into this category. Additionally, muscle relaxants do not come cheaply. Increased incidence of postoperative pulmonary complications, residual paralysis, and recurarization are well-known drawbacks. [3]

What are the alternatives to skeletal muscle relaxation in these situations? Remifentanil certainly is a good choice. Innumerable publications have proved its usefulness in this scenario. Apart from rare muscle rigidity (that might even require suxamethonium to allow ventilation) and occasional bradycardia, it consistently allows intubation without relaxants. High dose propofol bolus is another attractive option. Both require propofol and (or) remifentanil infusions for tube tolerance. Even though, both drugs are off patent, they are still considered expensive for routine use, especially as infusions.

The second option might be to use lidocaine in various forms to suppress responses associated with airway instrumentation. Laryngotracheal spray is commonly used both by anesthesiologists and pulmonologists. The plasma concentrations with doses up to 8.2 mg/kg body weight were found to be safe. [4] However, it would still be prudent to keep total dose administered within recommended limits, as transmucosal absorption is variable. Endotracheal administration of lidocaine can also suppress coughing and airway responsiveness, even in asthmatics. Aerosol is another well-accepted mode of airway topicalization useful in airway procedures, with advantage of being completely noninvasive. The success of nebulization relies upon the appropriate concentration of lidocaine (4%) and gas inflow (4-6 L/min). It is a common error to increase the speed of nebulization; gas flow rates are stepped up. This actually decreases the particle size, which not only increases systemic absorption, but also makes the whole process ineffective. [5]

Transtracheal injection, for the purpose of avoiding muscle relaxants, may not be acceptable to patients from all cultures and countries. In USA, any awake needle insertion (apart from intravenous cannulation) would be unacceptable to patients. Moreover, transtracheal injections primarily rely upon patient's coughing effort. Poor cough may lead to unpredictable drug spread and ultimately ineffective anesthesia. Additional blocks are often recommended with transtracheal injections as supraglottic structures are frequently spared, leading to excess gag reflex and procedure failures. [6] Additionally, airway trauma is more frequent in patients intubated without using relaxants. [7]

Other innovative approaches are available for lidocaine administration. Use of hydrophobic lidocaine solutions to inflate the endotracheal tube cuff is one such option. This technique allows gradual migration of up to 2/3 rd of the drug into tracheal mucosa providing clinically significant local anesthetic effect. [7] Tubes capable of instilling local anesthetic into tracheal mucosa both above and below the cuff via a specialized side port (LITA Tube- Sheridan Catheter Corp, NY, USA) can achieve the above goals without the need of any additional intervention. Such modifications may not only be useful in situations like the present trial but can also bring down sedation requirement for tube tolerance in the critically ill patients requiring ventilation. [8] Laryngeal mask airway can help securing airway without muscle relaxation especially in peripheral nerve surgeries, where intraoperative motor nerve monitoring is critical for procedural success.

However, the question regarding the safety of intubation without muscle relaxants needs to be addressed. The adequacy of depth of anesthesia while intubation is attempted without relaxation is beyond doubt. The laryngoscopy and intubation without relaxants require far greater depth of anesthesia (in spite of transtracheal lidocaine or lidocaine spray) than with relaxants.[9] The question is can it be achieved safely? Airway trauma, multiple attempts, inadequate ventilation (due to remifentanil induced rigidity), and patient movement are some of the drawbacks. The inability to intubate on first attempt might be frustrating to a new trainee. As a result, intelligent case selection is important, patients with anticipated difficult intubation/ventilation are not appropriate. The threshold for taking "another look" in case of difficulty on first attempt should be low. Supplemental dose of propofol might do the "trick". Wider availability of video laryngoscopy might help greatly in this regard. Last, timely administration of short-acting muscle relaxant should be considered in unanticipated difficulty. Maintenance of anesthesia without skeletal muscle relaxants is far easier than intubating.

In conclusion, the present study validates that under general anesthesia, neuromuscular blockade is not a must for endotracheal tube tolerance. However, more acceptable and effective methods other than transtracheal injections exist. The choice depends on availability, affordability, and personal expertize.

 
  References Top

1.Sunil Rajan, Nitu Puthenveettil, Jerry Paul. Transtracheal lidocaine: An alternative to intraoperative propofol infusion when muscle relaxants are not used. J Anaesth Clin Pharmacol 2014;30:200-3.  Back to cited text no. 1
    
2.Griffith HR, Johnson GE. The use of curare in general anaesthesia. Anesthesiology 1942;3:418-20.  Back to cited text no. 2
    
3.Grosse-Sundrup M, Henneman JP, Sandberg WS, Bateman BT, Uribe JV, Nguyen NT, et al. Intermediate acting non-depolarizing neuromuscular blocking agents and risk of postoperative respiratory complications: Prospective propensity score matched cohort study. BMJ 2012;345:e6329.  Back to cited text no. 3
    
4.British Thoracic Society Bronchoscopy Guidelines Committee, a Subcommittee of Standards of Care Committee of British Thoracic Society. British Thoracic Society guidelines on diagnostic flexible bronchoscopy. Thorax 2001;56 Suppl 1:i1-21.  Back to cited text no. 4
[PUBMED]    
5.Walsh ME, Shorten GD. Preparing to perform an awake fiberoptic intubation. Yale J Biol Med 1998;71:537-49.  Back to cited text no. 5
    
6.Reasoner DK, Warner DS, Todd MM, Hunt SW, Kirchner J. A comparison of anesthetic techniques for awake intubation in neurosurgical patients. J Neurosurg Anesthesiol 1995;7:94-9.  Back to cited text no. 6
    
7.Yan Z, Tanner JW, Lin D, Chalian AA, Savino JS, Fleisher LA, et al. Airway trauma in a high patient volume academic cardiac electrophysiology laboratory center. Anesth Analg 2013;116:112-7.  Back to cited text no. 7
    
8.Dollo G, Estebe JP, Le Corre P, Chevanne F, Ecoffey C, Le Verge R. Endotracheal tube cuffs filled with lidocaine as a drug delivery system: In vitro and in vivo investigations. Eur J Pharm Sci 2001;13:319-23.  Back to cited text no. 8
    
9.Mallick A, Smith SN, Bodenham AR. Local anaesthesia to the airway reduces sedation requirements in patients undergoing artificial ventilation. Br J Anaesth 1996;77:731-4.  Back to cited text no. 9
    




 

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