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Contents
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xi
7.2.5 Case 5: Right Vocal Fold Leukoplakia . . . . . . . . . . . . . 78
7.2.6 Case 6: Right Anterior Vocal Fold Leukoplakia . . . . . 79
7.3 Surgical Steps in Ofce- Based Blue Laser Therapy of
Vocal Fold Leukoplakia . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8 Blue Laser Therapy of Vocal Fold Scars . . . . . . . . . . . . . . . . . . . . 83
8.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
8.2 Case Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
8.2.1 Case 1: Left Fibrotic Vocal Fold Mass . . . . . . . . . . . . . 84
8.2.2 Case 2: Left Vocal Fold Fibrotic Mass . . . . . . . . . . . . . 85
8.2.3 Case 3: Left Vocal Fold Scar . . . . . . . . . . . . . . . . . . . . 86
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
9 Blue Laser Therapy of Laryngeal Stenosis . . . . . . . . . . . . . . . . . . 89
9.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
9.2 Case Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
9.2.1 Case 1: Anterior Commissure Sub-Cordial Web . . . . . 91
9.2.2 Case 2: Posterior Supraglottic Stenosis . . . . . . . . . . . . 93
9.2.3 Case 3: Posterior Glottic Scar . . . . . . . . . . . . . . . . . . . 94
9.2.4 Case 4: Anterior Laryngeal Vocal Fold Web . . . . . . . . 95
9.2.5 Case 5: Subglottic Stenosis . . . . . . . . . . . . . . . . . . . . . 96
9.2.6 Case 6: Tracheotomy Stoma Stenosis . . . . . . . . . . . . . 98
9.2.7 Case 7: Subglottic and Posterior Glottic Stenosis . . . . 99
9.2.8 Case 8: Subglottic Stenosis . . . . . . . . . . . . . . . . . . . . . 100
9.2.9 Case 9: Anterior Glottic Web . . . . . . . . . . . . . . . . . . . . 100
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102
10 Rare Applications of Blue Laser Therapy in Laryngology . . . . . 103
10.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
10.2 Case Presentations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
10.2.1 Case 1: Blue Laser Partial Cordectomy . . . . . . . . . . 103
10.2.2 Case 2: Pharyngeal Neuroendocrine Tumor . . . . . . . 104
10.2.3 Case 3: Left False Vocal Fold Mass . . . . . . . . . . . . . 105
10.2.4 Case 4: Vocal Fold Incision for Homograft Fascia . . .106
10.2.5 Case 5: Extruded Fascia Lata . . . . . . . . . . . . . . . . . . 107
10.2.6 Case 6: Right Laryngocele . . . . . . . . . . . . . . . . . . . . 108
10.2.7 Case 7: Medial Arytenoidectomy . . . . . . . . . . . . . . . 110
10.2.8 Case 8: Right False Vocal Fold Mass . . . . . . . . . . . . 111
Suggested Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113
About the Authors
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Abdul-Latif Hamdan, MD, EMBA, FACS is currently a Professor of Otolaryngology, Head and Neck Surgery, Head of the Division of Laryngology and Director of “Hamdan Voice Unit” at the American University of Beirut Medical Center (AUBMC), and Adjunct Professor at the Department of the Otolaryngology, Head and Neck Surgery, Drexel University College of Medicine. He is the founder of the “Hamdan Voice and Swallowing Unit” at AUBMC, the Lebanese Voice Association, the “Hamdan International Award” at the Voice Foundation, and the Voice Foundation Lebanon chapter. He is the author of 170 publications and 8 books.
Robert Thayer Sataloff, MD, DMA, FACS is Professor and Chair, Department of Otolaryngology-Head and Neck Surgery and Senior Associate Dean for Clinical Academic Specialties, Drexel University College of Medicine. Dr. Sataloff is Director of Otolaryngology and Communication Sciences Research at the Lankenau Institute for Medical Research and Director of Otolaryngology Education at Lankenau Medical Center. He also holds Adjunct Professorships in the Departments of Otolaryngology-Head and Neck Surgery at Thomas Jefferson University, Temple University, and the Philadelphia College of Osteopathic Medicine, and he is on the faculty of the Academy of Vocal Arts. He serves as Conductor of the Thomas Jefferson University Choir. Dr. Sataloff is also a professional singer and singing teacher. He holds an undergraduate degree from Haverford College in Music Theory and Composition; graduated from Jefferson Medical College, Thomas Jefferson University; received a Doctor of Musical Arts in Voice Performance from Combs College of Music; and he completed Residency in Otolaryngology-Head and Neck Surgery and a Fellowship in Otology, Neurotology and Skull Base Surgery at the University of Michigan. Dr. Sataloff is Chair of the Boards of Directors of the Voice Foundation and of the American Institute for Voice and Ear Research. He also has served as Chair of the Board of Governors of Graduate Hospital; President of the American Laryngological Association, the International Association of Phonosurgery, the Pennsylvania Academy of Otolaryngology-Head and Neck Surgery, and the American Society of Geriatric Otolaryngology; and in numerous other leader­ship positions. Dr. Sataloff is Editor-in-Chief of the Journal of Voice; Editor Emeritus of Ear, Nose and Throat Journal; Associate Editor of the Journal of Singing; on the Editorial Board of Medical Problems of Performing Artists, and is an editorial reviewer for numerous otolaryngology journals. He is a member of the Editorial Panel of the AMA Guides to the Evaluation of Permanent Impairment. Dr. Sataloff has written over 1000 publications including 72 books, and he has been awarded more than $5 million in research funding. His H-index
xiii
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is 45 (as of January 2023). He has invented more than 75 laryngeal microsurgi­cal instruments distributed currently by Integra Medical, ossicular replacement prostheses produced by Grace Medical, and a novel laryngeal prosthesis (patent pending). He holds a patent on a unique thyroplasty implant. His medical prac­tice is limited to care of the professional voice and to otology/neurotology/skull base surgery. Dr. Sataloff has developed numerous novel surgical procedures including total temporal bone resection for formerly untreatable skull base malignancy, laryngeal microap and mini-microap procedures, vocal fold lipoinjection, vocal fold lipoimplantation, and others. Dr. Sataloff is recognized as one of the founders of the eld of voice, having written the rst modern com­prehensive article on care of singers, and the rst chapter and book on care of the professional voice, as well as having inuenced the evolution of the eld through his own efforts and through the Voice Foundation for over four decades. Dr. Sataloff has been recognized by Best Doctors in America (Woodward White Athens) every year since 1992, Philadelphia Magazine since 1997, and Castle Connolly’s “America’s Top Doctors” since 2002.
Omar Ramadan, MD , is a fellow at Drexel University College of Medicine in Laryngology/Care of the Professional Voice. He was born and raised in Homs, Syria. He received his medical degree from Al-Baath University. He completed Otolaryngology- Head and Neck Surgery residency at Damascus University. He practiced general otolaryngology in Syria, Jordan, and Kuwait. He completed Rhinology fellowship at St. Elizabeth’s Medical Center in Boston, Massachusetts.
About the Authors
Daniel Eichorn, DO is a resident physician in the Department of Otolaryngology-Head and Neck Surgery, at the Philadelphia College of Osteopathic Medicine. He has been a student of laryngology with Dr. Robert Sataloff.
MaryJ.Hawkshaw, BSN, RN, CORLN, FCPP is a Research Professor and Vice Chair for Academic Initiatives in the Department of Otolaryngology­Head and Neck Surgery at Drexel University College of Medicine. She has been associated with Dr. Robert Sataloff, Philadelphia Ear, Nose & Throat Associates and the American Institute for Voice & Ear Research (AIVER) since 1986. Ms. Hawkshaw graduated from Shadyside Hospital School of Nursing in Pittsburgh, Pennsylvania, and received a Bachelor of Science degree in Nursing from Thomas Jefferson University in Philadelphia. In addi­tion to her specialized clinical activities, she has been involved extensively in research and teaching. She mentors medical students, residents, and laryngol­ogy fellows and has been involved in teaching research, writing, and editing for over three decades. In collaboration with Dr. Sataloff, she has coauthored 185 articles, 108 book chapters, and 20 textbooks. She is on the Editorial Boards of the Journal of Voice and Ear, Nose and Throat Journal. She has served as Secretary/Treasurer of AIVER since 1988 and was named Executive Director of AIVER in January 2000. She has served on the Board of Directors of the Voice Foundation since 1990. Ms. Hawkshaw has been an active mem­ber of the Society of Otorhinolaryngology and Head-Neck Nurses since
1998. She is recognized nationally and internationally for her extensive con­tributions to care of the professional voice.
Introduction
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1
1.1 Vascular Lasers
The safety and efcacy of “vascular lasers” have been established, and two have been used widely in the larynx. They are the pulsed-dye laser (PDL) (585-nm) and the pulsed-KTP laser (532­nm). Manufacture of both has been discontinued. The blue laser (445-nm) is being used clinically and appears to have advantages over the pulsed­dye laser and the pulsed-KTP laser.
1.1.1 Pulsed-Dye Laser
The 585-nm PDL has been used to treat vocal fold disease. It was recognized by 1981 that dye lasers could be used to damage microvasculature [1]. Pulsed-dye lasers can be used through a ex­ible laryngoscope in an ofce setting or in the operating room. Typically, the laser is passed through a 1-mm ber and delivers a spot size of 1–2mm. Typical settings included up to 0.85J/ pulse, with a 450-μs pulse width, a 1Hz repeti­tion rate, and a uency of 19–76Joules per square centimeter (J/cm2). Treatment was tolerated well. In addition to treating abnormal vasculature, the PDL was used for papilloma [2, 3] and dysplasia [4, 5]. PDL is safe and effective for vascular lesions, and it also was useful in treatment in the ofce of carefully selected papilloma and dyspla­sia because it can avoid a general anesthesia. The
patients are treated as outpatients with topical anesthesia. For recurrent laryngeal papilloma, it was useful. KTP (other than pulsed-KTP), Thulium: YAG laser, and the CO2 laser delivered via OmniGuide and FibreLase may cut much more deeply. It is also possible during the same procedure for papilloma to inject Cidofovir with an indirect or direct endoscopic needle. However, as with any other laser, complications occurred. Hemorrhage from the vessels being treated was not rare. The prevalence of this complication was minimized by controlling the distance of the ber from the lesion, and by treating vascular abnor­malities starting with peripheral vessels, and working toward the more engorged portions of the lesions. However, even with the best tech­nique, bleeding occurred occasionally. The PDL was a “no-touch” laser that was useful for laryn­geal treatment both in the ofce and the operating room settings [2, 6–17].
1.1.2 KTP (Potassium, Titanyl, Phosphate) Crystal Laser
The KTP/532 is an Nd-YAG laser. Its potential for use in surgery increased through two impor­tant improvements: doubling of the frequency of the wavelength and point of contact. Frequency doubling offers a technique to change the output wavelength from 1064nm (infrared) to 532nm
© The Author(s), under exclusive license to Springer Nature Switzerland AG 2023 A.-L. Hamdan et al., Blue Laser Surgery in Laryngology,
https://doi.org/10.1007/978-3-031-35283-6_1
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1 Introduction
(green) by means of a special crystal that com­bines 2 infrared photons into 1 green photon. A conical sapphire at the end of an optical ber reects the laser beam to a sharp focal point at its tip. The temperature of the tip rises to several hundred degrees Celsius and, in contact mode, provides almost a pure cutting effect. The KTP laser is transmitted through clear uids and structures. It does not vaporize the tissues well. It usually has a 200-nm spot size when delivered through ber optic channels in endoscopes (available bers range from 0.2 to 0.6 mm in diameter). It can be used through the micro­scope. Perkins developed the KTP laser for oto­sclerosis, before it was used in the larynx [18]. Since 1986, KTP/532 has been used commonly for treatment of laryngeal pathology. Its green beam can be passed through the exible channel of a exible endoscope. There are many indica­tions; however, in our hands, the thermal damage from continuous delivery sometimes is more substantial than with the CO2 laser, and usually we use KTP only in a pulsed mode for vascular lesions. Pulsed- KTP laser has been used for treatment of vascular lesions of the vocal fold, in a manner similar to the pulsed-dye laser (see above). The pulsed- KTP laser has a wavelength of 532 nm. The KTP wavelength at 532 nm appears superior to the pulsed-dye laser which emits at 585nm. The 532-nm KTP wavelength is more strongly absorbed by oxyhemoglobin than the 585 PDL wavelength and is therefore less likely to cause bleeding from the vessels being treated. Often, the KTP laser is used with a lon­ger pulse duration (15ms) than the PDL (5ms) which also may contribute to decreased preva­lence of bleeding. However, its tissue effects are different from the PDL, and it may be more likely to cause injury and stiffness of tissues adjacent to the blood vessels being treated, espe­cially if the surgeon uses it with technique learned during PDL, rather than with the slightly different distances and power densities appropri­ate to KTP use. The KTP laser also can be used either in an outpatient setting or in the operating room. It is delivered through a ber. Typical set­tings are about 525–750mJ/pulse, with a 2-Hz repetition rate using a 0.4-mm ber, resulting in
a uence of about 20–80J/cm2. KTP is used in a “near-touch” mode. However, much skill and experience are required to maintain a constant “near-touch distance” from the target, to achieve maximum vascular effect while minimizing adjacent tissue response. The pulsed- KTP laser has been advocated for treatment of vascular lesions, as well as for treatment of papillomato­sis and dysplasia [19–30]. The pulsed- KTP laser has FDA approval since Nov. 17, 2003.
1.1.3 Blue Laser
The WOLF TruBlue (A.R.C. Laser, Nuremberg, Germany) emits laser light with a wavelength of 445nm. This wavelength is in the blue spectrum; and, compared with other laser devices discussed above, it has the highest absorption in hemoglo­bin and greater absorption in melanin/pigment. The scattering in tissue is pronounced, resulting in advantageous characteristic properties for the wavelength. Surgeons should be familiar with absorption characteristics associated with lasers of various wavelengths (Fig.1.1). Other compa­nies have started to produce blue lasers; but at the time of writing of this book, the authors “experi­ence” has been with the devices identied above.
Due to the high absorption in hemoglobin, melanin and pigment, the Blue can be operated at substantially reduced power densities compared to KTP and diode lasers. So, the energy delivered into adjacent tissue is lower, and thermal stresses and necrosis zones are minimized [31]. It also has almost complete transparency in water, i.e. cellular uids. This results in high selectivity between different types of tissue which ensures a high degree of precision in targeting vessels or pigmented lesions while minimizing laser effect on adjacent tissue.
The typical scattering effect results in rela­tively small penetration depth in tissue. This is a major advantage for the treatment of vocal folds, since tiny vessels, papilloma, or granuloma can be treated selectively, while the underlying tissue of the vocal folds should remain unaffected. CO2 laser also features low penetration depth due to its high absorption in water, but it does not distin-
1.2 Patient Selection andTolerance inOce-Based Laryngeal Laser Surgery
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Fig. 1.1 Absorption characteristics of lasers of various wavelengths. (Courtesy of A.R.C.Laser GmbH)
guish between pigmented and non-pigmented tis­sue; and, unlike Blue laser, CO2 laser causes indiscriminate damage to tissues regardless of pigment. This has resulted in limitations in the use of CO2 on the vocal folds that have been rec­ognized for decades. Care must be exercised not to use Blue laser at power densities that are too low because of recurrence of vessels despite apparent ablation in the operating room [32]. Six Watts with 40 ms pulse duration and 300 ms pulse pause seems to work well for vessels, and higher settings allow the Blue laser to function well as a cutting instrument. It can be used as no­touch or touch.
1.1.4 Summary
Vascular lasers are invaluable for treatment of laryngeal pathology. It is essential for surgeons to be familiar with absorption characteristics of lasers of various wavelengths. Especially for sur-
geons who have used PDL and KTP, it is impor­tant to recognize that lasers of different wavelengths (including Blue lasers) behave dif­ferently, and modications in power density and surgical technique are required. Vascular lasers work well in the operating room and for in-ofce surgery.
1.2 Patient Selection
andTolerance inOce­Based Laryngeal Laser Surgery
Most laryngeal surgery has been performed in an operating room under general anesthesia. Recently, an increasing number of cases is being performed in an ofce setting. This can have many advantages. However, not all patients are suitable for ofce-based laryngeal surgery. Pre- operative screening for health­related issues and morbidities has been advo-
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1 Introduction
cated by many authors to reduce the risk of intraoperative complications and to improve patients’ safety. In 2010, Yung and Courey investigated the hemodynamic changes in 31 patients who underwent in-ofce laryngeal procedures and reported a statistically signi­cant increase in diastolic blood pressure by
18.5 mm, and in heart rate by 14.6 beats per minute. There was also a signicant decrease in oxygen saturation that did not decline below 94%. The authors encouraged hemodynamic monitoring during ofce-based surgery [33]. In 2012, Morrison et al. concurred with the ndings of Yung and Courey and reported a mean increase in systolic blood pressure by
26.2+20.9 and in diastolic blood pressure by
13.9+13.8mmHg in a cohort of 100 patients. The authors noted higher frequency of these hemodynamic changes in patients above the age of 50 years and recommended intraopera­tive monitoring of those patients [34]. Madden etal. established pre- procedure hemodynamic parameters to help identify patients at risk for cardiovascular events during in-ofce laryn­geal surgery by asking patients to complete a screening tool that included questions related to metabolic equivalent tests (METs). Common examples of these tests included walking briskly and being able to climb two ights of stairs [35].
With proper patient selection considering age and associated morbidities, the overall comple­tion of ofce-based laryngeal surgery ranges between 92% and 100% [3, 13, 36]. In 2004, Zeitels et al. reported their experience in 51 patients with laryngeal papilloma and/or dyspla­sia of the vocal folds who were treated in-ofce using the pulsed-dye laser (PDL) and noted incompletion of the procedure in only 5 cases [3]. In 2007, Koufman etal. reviewed their experi­ence in 443 in-ofce laser surgery cases using different types of lasers and reported incomple­tion of the surgery in only one patient who had a vasovagal episode [13]. In 2012, Young et al. conducted a multi-institutional survey that included 154 patients, 19% of whom had laser therapy and reported an overall completion rate of 92%. The patients’ average discomfort score
was 37 on a scale of 0–100, with 100 being the most discomfort. Patients reported that they would undergo the procedure again and would recommend it to another patient in 93% and 96% of the cases, respectively [36].
Understanding the factors that contribute to success or failure of ofce-based laryngeal sur­gery is crucial. These have been analyzed by many investigators and stratied as patient­related factors and procedure-related factors.
1.2.1 Patient-Related Factors
Thorough consideration should be given to patient-related factors in the selection process for ofce-based laryngeal surgery. Based on numerous reports, the most important factor is patient’s tolerance and/or threshold for pain and gagging. Despite the use of good anes­thetic technique in the upper airway, patients with poor tolerance secondary to a strong gag reex and/or low threshold for pain commonly end up having an incomplete procedure. In 2006, Zeitels et al. conducted a prospective review of 72 cases of ofce- based KTP laser therapy for glottal dysplasia or papilloma and reported abandoning the procedure in 2 cases, 1 of which was due to poor patient tolerance [19]. In 2006, Rees et al. conducted a phone survey of 89 patients who had undergone ofce-based PDL surgery mainly for laryngeal papilloma and reported a comfort score of 7.4 with 10 being the worst pain and an adjusted pain level of 2.6/10. Thirteen percent of patients who were surveyed preferred operat­ing room treatment [16]. In 2010, Halum and Moberly investigated pain discomfort during and after surgery in 10 patients who underwent ofce- based laser therapy using PDL or carbon dioxide (CO2) and reported an average pain score of 2.0 on a scale of 0–10. The laryngeal pathology treated most was RRP [37]. In 2013, Centric et al. reviewed their experience in ofce-based PDL therapy of laryngeal lesions in 33 patients and reported a tolerance rate of 97%. One patient with vocal process granu­loma developed an anxiety attack and could
1.2 Patient Selection andTolerance inOce-Based Laryngeal Laser Surgery
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5
not proceed with the surgery. No complications were noted in their study group [5].
Several authors also investigated the demo­graphic characteristics of patients in attempt to improve our understanding of the key suc­cess factors in office-based laryngeal surgery. In 2020, Whited et al. reviewed 292 awake upper airway procedures that included KTP laser application among other types of surger­ies. Patients’ demographic characteristics such as age, gender, and body mass index (BMI) did not affect the completion rate or pain. However when combined with psychiatric ill­nesses they did. The completion rate varied between 98.7% and 99% depending on whether it was a first-time procedure or a repeated procedure [38]. In 2021, Zheng etal. reviewed the factors associated with tolerance in 56 patients with various types of laryngeal pathology who underwent in-office laser sur­gery using the KTP laser [39]. The authors noted that the tolerance scores were lower in patients who were current or former smokers, and in patients with asthma or chronic obstruc­tive pulmonary disease (COPD). That was attributed to increased sensitivity of the laryn­geal mucosa, mucus hypersecretion, and vocal fold dysfunction which is known to be more prevalent in patients with lower airway dis­eases [40–42]. The authors also noted that patients with posterior lesions or multiple lesions had lower scores than those with lesions of the vocal folds or with a single lesion. This was ascribed to the higher density of sensory receptors in the posterior larynx which makes it easier to elicit laryngeal adduc­tor reflex as a protective mechanism [43]. This agrees with the strong negative correlation that was present between tolerance scores and vocal fold movement, swallowing and aber­rant strikes of laser. Moreover, patients with RRP, Reinke’s edema, and dysplasia had lower tolerance score than those with vocal fold pol­yps and cysts probably because these latter are isolated rather than more intensive or diffuse lesions. Interestingly, BMI, age, and gender did not correlate significantly with tolerance.
Pre-operative patient counseling and educa­tion based on the above are very helpful in improving patients’ tolerance and cooperation, although this strategy may not succeed in all cases.
1.2.2 Procedure-Related Factors
In addition to patient-related factors, there are procedure-related factors that affect the success of ofce-based laryngeal surgery. One is the lim­ited angulation of the laser glass ber [44]. In ofce-based laser surgery, the glass ber usually is introduced through the working channel of the exible endoscope and advanced with the endo­scope toward the site of lesion. The laser is then applied in non-contact or contact mode to cau­terize, vaporize, or selectively photoangiolyse the submucosal vasculature of the lesion. The energy delivered during surgery is affected markedly by the direction of the laser beam. It is markedly less when the laser beam is tangential to the lesion rather than perpendicular. Another procedure- related factor that may affect comple­tion of in- ofce laser surgery is the extent of dis­ease. When the lesion extends to the subglottic region, there may be limited access to the dis­ease. In an ofce setting in 2004, Zeitels etal. reviewed 51 patients with laryngeal papilloma or dysplasia of the vocal folds treated in-ofce using the PDL and noted poor exposure as a cause of incomplete surgery [3]. Other proce­dure-related factors include breaking of the laser glass ber. In the review of 443 cases by Koufman etal., 1 patient had a ber tip break [13].
In in-ofce surgery in which the laser ber angle through the exible laryngoscope is not satisfactory, completing the surgery in the oper­ating room at a later date is not the only option. Transoral laser surgery can be performed by passing the laser ber through a curved suction or a cannula. The different angles achieved (compared with the exible endoscope) may permit access to the lesion and completion of surgery.
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1 Introduction
1.2.3 Summary
Vascular lasers can be invaluable in managing laryngeal disorders. The blue laser has many advantages over its predecessors, but surgeons must be familiar with the behavior of lasers of different wavelengths; and surgical technique must be adjusted in accordance with the details of laser performance and tissue interaction. Laser surgery can be performed well in the ofce or in the operating room. Both settings offer advan­tages and disadvantages, and decisions about where surgery should be performed need to be made based on each patient’s conditions, needs, wants, and tolerance.
Acknowledgement The authors are grateful to Nils Hoffmann for assistance with and review of this chapter.
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