The fiberoptic bronchoscope can be a powerful tool in the hands of a skillful operator. Multiple articles and reviews(1) have
outlined its utility in airway examination(2), double lumen tube placement(3), pulmonary lavage(4), etc. Two recent books are
recommended(5,6). The most valuable application is in securing an airway in two classes of patients:
1) individuals who carry the history of difficult intubation or who have conditions known to dispose to difficult intubation (e.g.
Treacher-Collins Syndrome(7), ankylosing spondylitis, achondroplasia(8), etc.
2) patients with compromised airways who may decompensate if trauma occurs during a failed direct or blind intubation
attempt (tumor, trauma(9), abscess(10))
Individuals and departments who wish to develop a fiberoptic capability may consider the drawbacks of such a decision.
These include initial expense, breakdowns, storage, cleaning, training of staff, and certification. We will review some of these
Many of the high quality fiberoptic scopes are designed for use by bronchoscopists who need the ability to achieve sharp
angulation of the tip and to lock the angle while passing biopsy forceps. Both of these features increase the expense and
decrease durability. In the past, attempts to produce a more rugged and affordable scope have compromised optics and
lighting far too much for practicality. However, instruments now on the market have solved virtually all of the earlier problems.
They are moderately priced, have quality optics and lighting, a small diameter (4.0 mm) and are quite durable.
A special area for cleaning scopes must be designated and universal precautions employed to prevent transmission of
disease(11). The following routine is suggested: 1) the instrument is cleaned immediately after the procedure is completed in
order to remove superficial debris, 2) the scope is then soaked for 10 minutes in a cidex bath - with aspiration and injection of
cidex through the suction port, and 3) the scope is rinsed in two separate baths of sterile water, again with aspiration and
injection of cleaning solution. The scope is then wiped dry and stored in a designated cabinet.
A rather awkward issue has recently arisen secondary to medical-legal considerations and the increasing influence of regulatory
bodies. This concerns the matter of certification of individuals who perform fiberoptic procedures. While there are no accepted
standards at the present time, each group or institution should develop their own policies and procedures.
Fiberoptic intubation is simple in principle, but with potential difficulties in practical application. It requires practice
to learn. In addition, whereas it is often arguably the "best" way to proceed, it is infrequently an absolute necessity. The
combination of these factors make it unlikely that more than a small percentage of any group will master its use. For those who
are interested, there is one basic suggestion; use the scope frequently - at least whenever a nasal intubation is planned. Finally,
as one becomes identified as the in-house fiberoptic expert, resist requests of colleagues to "stand-by" while they try a known
difficult intubation by standard methods. Insist on committing to a fiberoptic procedure from the outset.
Familiarity with the scope features and practice in manipulation should be obtained before clinical use. Tip control is
quite simple, up/down motion is adjusted with the deflection lever; right/left motion is accomplished by
clockwise/counter-clockwise rotation of the entire scope-handle and shaft. Trying to effect this rotation by turning the handle
alone (without simultaneous rotation of the shaft with the other hand) produces torque which the smaller scopes may not
tolerate - especially if they are passing through a snug fitting endotracheal tube. This twisting is one of the most common causes
of scope damage. Be sure to rotate the entire scope as a unit. Direction changes should be made with very small
movements of the lever. Do not attempt to deflect the endotracheal tube tip by scope deflections as cable damage may
There are a number of procedural options regarding the route (oral vs nasal), patient condition (awake, anesthetized,
spontaneous vs controlled ventilation) and intubation technique (scope-first vs tube-first). The relevant factors that
determine choice will be evaluated throughout the text. In this author's experience, the most straight forward combination is a
nasal intubation, using the tubefirst technique, in a spontaneously breathing patient. We shall discuss this approach in
Adequate preparation is frequently the key to success. Secretions are the enemy of the endoscopist. An antisialogogue,
administered in sufficient time to work, is imperative. Scopolamine, atropine or glycopyrrolate may be used. We routinely use
glycopyrrolate because it is non-sedative and results in fewer hemodynamic side effects than atropine. The nasal passage (if the
nasal route is chosen) and the oropharynx, cords, and trachea should be topicalized with lidocaine or cocaine. Superior
laryngeal and transtracheal blocks are described elsewhere. Whereas nerve blocks can be valuable under special
circumstances, many experienced clinicians use simple topicalization. I prefer a good atomizer and use 4% lidocaine. One must
limit the total amount used to 5 mg/kg and be alert for signs of toxicity. The patient is asked to breathe deeply, while
inhaling a mist sprayed into the open airway. This can be done repeatedly as other aspects of patient preparation are
underway. The local anesthetic is distributed over the laryngeal surfaces and, in conjunction with sedation, usually produces
very satisfactory intubating conditions. The nasal passage is first topicalized with spray then with cotton swabs coated with 2%
lidocaine jelly. Vasoconstriction is very important and is accomplished by using 5% cocaine as the anesthetic or by adding
phenylephrine to 2% lidocaine jelly. The swab may be passed along the floor of the nasal passage directly back until it hits the
posterior wall of the nasopharynx. The ease of passage gives a feel for the patency. If necessary, the other nostril is treated.
The nasal passage is then dilated starting with small, and then with progressively larger, soft nasal airways coated
with the lidocaine jelly, phenylephrine mixture. This should be done patiently and carefully with additional anesthetic used
as necessary. The largest airway which can be introduced then serves as a guide to the acceptable maximum endotracheal tube
size. The largest nasal airway is left in for a few minutes to compress turbinates in preparation to receive the endotracheal tube.
Sedation is quite desirable during this period of preparation. I find small doses of droperidol and fentanyl to be ideal, even in
children. Of course it must not be overdone, especially when there is doubt of the ability to manage the airway with a mask
should it become necessary. This supplemental sedation should be started early (soon after arrival in O.R.), given slowly, and
titrated to effect.
After sedation, topicalization, and dilatation an appropriate endotracheal tube (softened by heat) is introduced
through the nose and gently advanced just until the bend is made at the posterior nasopharynx. This is signaled by a
sudden "give" after an initial resistance. It is important to stop immediately at this point to avoid passing the tube too far. It is
useful to introduce a flexible suction catheter (14 F) down the tube to clear all secretions. If the suction catheter does not pass
out of the tube, the latter should be repositioned (usually rotated or withdrawn slightly) until it does. After the scope has been
prefocused and lubricated, it is passed through the tube and the glottic opening is sought. The sequence to this point describes
the tube-first technique. The alternative method is called the scope-first technique, wherein the endotracheal tube is first passed
over the scope up to the base of the handle. The scope tip is then passed through the nostril and manipulated through the naso
and oropharynx to the glottic opening. There are both advantages and disadvantages associated with each technique. When
the tube is passed first, it acts as a clean conduit and as a stint for scope support and orientation. On the negative side, there is
a tendency to pass the tube too far. Also, the tip of the endotracheal tube may be buried in pharyngeal tissue. If recognizable
anatomy is not seen, then the tube is slowly withdrawn. It is claimed that this sequence carries the hazard of induced bleeding
which might obscure the field of vision. In my experience this problem virtually disappears with proper dilatation,
vasoconstriction, and tube size selection described above. The scope is manipulated through the cords and advanced well into
the trachea. Then, both the tube and the scope are advanced as a unit until the tube is within trachea. The scope is then
withdrawn with continued visualization to assure that the tube is not inadvertently pulled out of the trachea. Again, this
maneuver differs from the scope-first method wherein the tube is advanced over the scope during tracheal placement. I feel
that advancing the two together reduces (while not eliminating) the probability of kinking or buckling of the scope when bends
must be negotiated during insertion. The problem of kinking can be serious and not only prevents a successful
intubation, but can cause scope damage and airway obstruction. It arises because some of the smaller bronchoscopes
are too compliant to guide a stiff tube through small radius curves, or because of "hang-up" on the cords or arytenoids.
The lists below show the comparative issues when choosing the oral or nasal route, provided the patient's anatomy and surgical
procedure allows such choice.
* Whereas it is preferable to perform oral intubation in patients who are anticoagulated, the nasal route may be safely used,by performing the
nasal preparatory procedures very carefully, and using a small, soft endotracheal tube.
** Two oral airways are available. The Williams Airway Intubator and the Ovassapian Fiberoptic Airway. These are designed differently and
may each be useful in different circumstances.
Fiberoptic intubations are, in my experience, easier when done awake and by the nasal route. In increasing order of
awake - nasal
awake - oral
asleep - nasal - spontaneous ventilation
asleep - nasal - controlled ventilation
asleep - oral - spontaneous ventilation
asleep - oral - controlled ventilation
The procedure is performed under anesthesia some means of assisting or controlling ventilation usually must be instituted. This
may be accomplished with special devices manufactured for the purpose. Anesthesia masks are available equipped with
separate openings for ventilation and tube insertion. We have refined a feasible alternative, wherein ventilation is controlled
or assisted via a nasal airway (with adaptor) introduced through one nostril while the tube-first intubation sequence
proceeds through the other nostril. When the scope is passed through a nasally placed tube there is usually minimal leak
through the annular space thus created. The mouth is easily held shut to form a tight seal and fiberoptic intubation can proceed
under calm and controlled circumstances. We have used this technique multiple times in both emergency settings and in failed
direct intubations in patients who were anesthetized and paralyzed(12).
I. Lubrication and tube size/scope diameter:
Lubrication with a generous coating of mild soap to the scope shaft and removal of the endotracheal tube connector (don't lose
it!) allows a full one half size smaller tube to be used with any given scope. For example, a 4.9 mm O.D. scope rated as
permissible for use with a 6.0 I.D. tube will smoothly pass through a 5.5 I.D. tube using a soap lubricant and removing the
II. Manipulation through the glottic opening:
The scope does not necessarily follow the tip when it is advanced, especially in a supine patient. You may be frustrated to find
that you can see the target but not hit it. This often occurs with the extremely anterior larynx. In this circumstance, the natural
anterior curve of the ETT may be used to direct the scope (provided, of course, the tube has already been advanced through
the nares as suggested) toward the larynx and then a posterior bend applied to actually enter the trachea. Alternately, some
practitioners advocate a patient-sitting position for the entire intubation procedure. This greatly facilitates visualization in most
cases, but the position is not always practical.
III. Avoiding scope damage:
a. Never try to angulate the scope tip while the end is still in the endotracheal tube; the cables may stretch or break.
b. Never try to remove the scope from the tube while locking mechanism is engaged. The locking feature should be eliminated from scopes used for intubation.
c. Scope rotation to effect left/right orientation is rather more difficult using the tube first technique - especially if anatomy or
equipment constraints have resulted in a snug scope/tube fit. Rotation is achieved in this case by turning the tube and scope
In spite of the drawbacks it seems reasonable that, as putative airway "experts", anesthesiologists (or some group
representative) should develop a fiberoptic capability and provide this advanced dimension of patient care.