Safety and efficacy of topical quinolones.Support bacteria--it's the only culture some people have. --Bumper sticker Introduction Dr. Joseph E. Dohar: At the end of the day, infectious diseases are treated with antibiotics to eradicate the bacteria causing the infections. The only caveat we must consider when taking advantage of the fatal attraction between antibiotics and the bacteria that they kill is that the killing must be done safely! "Do no harm," cried Hippocrates. In this article, we examine the evidence on the safety as well as the efficacy of ototopical quinolone therapies. Ototoxicity Dr. John Rutka: We think of ototoxicity as primarily involving the inner ear, but middle ear toxicity occurs, as well. We have become aware that not only do systemic agents cause ototoxicity, but topical agents are also implicated (table 1). If we were to stop using aminoglycosides aminoglycoside /ami·no·gly·co·side/ (-gli´ko-sid) any of a group of antibacterial antibiotics (e.g., streptomycin, gentamicin) derived from various species of Streptomyces or produced synthetically; they interfere with the function of bacterial ribosomes. and cytotoxic agents, we would probably eliminate much of the ototoxicity that occurs in the Western world. However, we have recently learned that many other compounds are ototoxic, as well, depending on the clinical situation (table 2). For example, the macrolide antibiotic azithromycin azithromycin /az·ith·ro·my·cin/ (az-ith?ro-mi´sin) a macrolideantibiotic derived from erythromycin, effective against a wide range of gram-positive, gram-negative, and anaerobic bacteria. can be quite toxic to the inner ear in patients who are undergoing treatment for human immunodeficiency virus (HIV) infection. Vancomycin is probably not toxic to the inner ear on its own, but when it is combined with an aminoglycoside, its effects are potentiated and it is quite possible that it will cause ototoxicity. In 2004, a consensus panel of the American Academy of Otolaryngology-Head and Neck Surgery published its review of the efficacy and safety of topical antibiotics and made several recommendations (1): * When possible, topical antibiotic preparations that are free of potential ototoxicity are preferable to those that do have the potential for otologic injury in patients with an open middle ear or mastoid. * When a potentially ototoxic antibiotic is chosen, it should be used only in infected ears and it should be discontinued shortly after the infection has resolved. * When a potentially ototoxic antibiotic drop is prescribed for a patient with an open middle ear or mastoid, the patient or parent should be warned of the risk of ototoxicity. The patient or parent should be specifically instructed to call the physician or return to the office if the patient develops: (1) dizziness or vertigo, (2) heating loss or a worsening of hearing if such an impairment was already present, or (3) tinnitus. The treating physician should consider the possibility of ototoxic injury when evaluating these new or exacerbated symptoms. The panel added that if the tympanic membrane is known to be intact and the middle ear and mastoid are closed, the use of a potentially ototoxic preparation presents no risk of ototoxic injury. Our role as physicians requires that we protect patients. If our treatment leads to ototoxicity, we have failed the patient, especially if it could have been prevented. Although many patients adapt well to a unilateral sensorineural hearing loss and compensate for a unilateral vestibular loss, such is not the case when bilateral ototoxicity occurs. When bilateral ototoxicity occurs as a result of ototopical therapy, the consequences can be devastating in terms of total deafness and a debilitating balance disorder. No evidence of quinolone ototoxicity Dr. Rutka: Systemic quinolones are associated with some significant adverse effects and drug interactions. Among the adverse effects are arthropathy Charcot's arthropathy neuropathic a. chondrocalcific arthropathy progressive polyarthritis with joint swelling and bony enlargement, most commonly in the small joints of the hand but also affecting other joints, characterized radiographically by narrowing of the joint space with subchondral erosions and sclerosis and frequently chondrocalcinosis. and chondrotoxicity, Achilles tendon rupture in the elderly,
photosensitivity, and QTc prolongation. Drug interactions include an
increase in the risk of cardiac arrest when a quinolone is used with
theophylline, an increase in the anticoagulation properties of warfarin,
and an increase in phenytoin levels above their therapeutic range.But are topical quinolones ototoxic? I performed an Ovid MEDLINE search using ciprofloxacin as the keyword search term, and I found almost 10,000 articles--9,916 to be precise--published from 1966 through the third week of February 2004 (table 3). I then searched for articles on diagnosis that contained deafness as a keyword, and I found 2,101 articles. But when I searched for peer-reviewed articles that contained both ciprofloxacin and deafness as keywords, I did not find a single article. In other words, there has not been a single report in the world literature in which ciprofloxacin has been implicated as a cause of deafness. Not content with this result, I performed a more focused investigation. I searched for articles with the keywords hair cells, hearing disorders, cochlear, deafness, ototoxicity, or sensorineural hearing loss and found 43,794 articles. Only 25 of these articles included any mention of ciprofloxacin: * 7 were reports of animal studies; only 1 included any mention of ototoxicity, and it concerned mild inner ear toxicity that had been caused by nalidixic acid, which is a ciprofloxacin precursor. * 7 articles reported comparisons of the efficacy of systemic ciprofloxacin and aminoglycosides in humans; no case of ciprofloxacin ototoxicity was reported. * 10 articles included the results of studies of topical ciprofloxacin, and none showed that it was ototoxic. * 1 was a unique human study in which intratympanic ciprofloxacin drops were instilled into the middle ear space of 10 patients with an acoustic neuroma; the authors found no evidence of measurable absorption of the drug in the labyrinthine fluid, cerebrospinal fluid, or serum, which indicates that the chance of ciprofloxacin toxicity is low. (2) Chronic suppurative otitis media (CSOM) Dr. Rutka: In patients with CSOM, randomized controlled trials have shown that antibiotic and antiseptic treatment combined with aural toilet is better than no treatment, but aural toilet alone is not. (3) Also, topical antibiotics and antiseptics are better than systemic antibiotics. Finally, there is no significant difference in effectiveness between a topical antibiotic/antiseptic alone and a combination of a topical and systemic antibiotic. These studies have also shown that quinolones, taken either topically or systemically, appear to be more effective than other types of antibiotics. A surprising finding is that antiseptics may be just as effective as antibiotics. Topical treatment is associated with negligible or no change in hearing. Dr. Patrick J. Antonelli: I agree. The literature clearly shows that the ototopical quinolones are efficacious (table 4). (4-12) References (1.) Roland PS, Stewart MG, Hannley M, et al. Consensus panel on role of potentially ototoxic antibiotics for topical middle ear use: Introduction, methodology, and recommendations. Otolaryngol Head Neck Surg 2004;130(3 suppl):S51-6. (2.) Becvarovski Z, Kartush JM, Bojrab DI. Intratympanic ciprofloxacin and the human labyrinthine sampling model. Laryngoscope 2002; 112:686-8. (3.) Acuin J, SmithA, Mackenzie I. Interventions for chronic suppurative otitis media. Cochrane Database Syst Rev 2000;(2):CD000473, updated Nov. 15, 2004. (4.) Yuen PW, Lau SK, Chau PY, et al. Ofloxacin eardrop treatment for active chronic suppurative otitis media: Prospective randomized study. Am J Otol 1994;15:670-3. (5.) Tutkun A, Ozagar A, Koc A, et al. Treatment of chronic ear disease. Topical ciprofloxacin vs topical gentamicin. Arch Otolaryngol Head Neck Surg 1995;121:1414-16. (6.) Tong MC, Woo JK, van Hasselt CA. A double-blind comparative study of ofioxacin otic drops versus neomycin-polymyxin B-hydrocortisone otic drops in the medical treatment of chronic suppurative otitis media. J Laryngol Otol 1996; 110:309-14. (7.) Fradis M, BrodskyA, Ben-David J, et al. Chronic otitis media treated topically with ciprofloxacin or tobramycin. Arch Otolaryngol Head Neck Surg 1997;123:1057-60. (8.) Miro N. Controlled multicenter study on chronic suppurative otitis media treated with topical applications of ciprofloxacin 0.2% solution in single-dose containers or combination of polymyxin B, neomycin, and hydrocortisone suspension. Otolaryngol Head Neck Surg 2000;123:617-23. (9.) Nawasreh O, Fralhat A. Topical ciprofloxacin versus topical gentamicin for chronic otitis media. East Mediterr Health J 2001;7:2630. (10.) Couzos S, Lea T, Mueller R, et al. Effectiveness of ototopical antibiotics for chronic suppurative otitis media in Aboriginal children: A community-based, multicentre, double-blind randomised controlled trial. Med J Aust 2003;179:185-90. (11.) Jaya C, Job A, Mathai E, Antonisamy B. Evaluation of topical povidone-iodine in chronic suppurative otitis media. Arch Otolaryngol Head Neck Surg 2003;129:1098-1100. (12.) Macfadyen C, Gamble C, Garner P, et al. Topical quinolone vs. antiseptic for treating chronic suppurative otitis media: A randomized controlled trial. Trop Med Int Health 2005;10:190-7.
Table 1. Major groups of traditional ototoxic agents
in humans
Aminoglycosides Cytotoxic agents
Amikacin Bleomycin
Dihydrostreptomycin Carboplatinum
Gentamicin Cisplatinum
Kanamycin Nitrogen mustard
Neomycin Vincristine
Netilmicin
Streptomycin Others
Tobramycin Acetylsalicylic acid
Arsenicals
Loop diuretics
Quinine
Table 2. More recently identified ototoxic agents
Antiseptics/disinfectants Topical antibiotics
Alcohol All aminoglycosides
Chlorhexidine Chloramphenicol
Polymyxin
Macrolide antibiotics
Azithromycin Others
Clarithromycin Iron chelating agents
Erythromycin Nonsteroidal
anti inflammatory drugs
Table 3. Results of the MEDLINE search
Search Search No.
no. target articles
#1 All articles with keyword "ciprofloxacin" 9,916
#2 #1, human studies, English language only 6,341
#3 All articles on diagnosis with keyword "deafness" 2,101
#4 #1 and #3 0
#5 #2 and #3 0
#6 All articles with keywords "hair cells," "hearing 43,794
disorders," "cochlear," "deafness," "ototoxicity,"
or "sensorineural hearing loss"
#7 #1 and #6 25
Table 4. Selected studies of the efficacy of topical quinolones in CSOM
Author Comparator agent No. pts.
Yuen et al, (4) 1994 Oral amoxicillin/clavulanate 56
Tutkun et al, (5) 1995 Gentamicin 44
Tong et al, (6) 1996 Neomycin/polymyxin B/ 52
hydrocortisone
Fradis et al, (7) 1997 Tobramycin 60
Miro, (8) 2000 Neomycin/polymyxin B/ 232
hydrocortisone
Nawasreh and Gentamicin 88
Fraihat, (9) 2001
Couzos et al, (10) 2003 Framycetin (neomycin)/ 147
gramicidin/dexamethasone
Jaya et al, (11) 2003 Povidone-iodine 40
Macfadyen et al, (12) 2005 Boric acid in alcohol 427
Author Findings/comment
Yuen et al, (4) 1994 Ofloxacin superior (cure rates: 76
vs. 26%)
Tutkun et al, (5) 1995 Ciprofloxacin superior (cure rates:
88 vs. 30%)
Tong et al, (6) 1996 Ofloxacin marginally superior (cure
rates: 89 vs. 79%)
Fradis et al, (7) 1997 Ciprofloxacin equivalent (cure rates: 79
vs. 72%)
Miro, (8) 2000 Ciprofloxacin equivalent, but combination
was associated with hearing loss
Nawasreh and Ciprofloxacin superior (cure rates:
Fraihat, (9) 2001 88 vs. 30%)
Couzos et al, (10) 2003 Ciprofloxacin superior (cure rates:
76 vs. 52%)
Jaya et al, (11) 2003 No difference
Macfadyen et al, (12) 2005 Ciprofloxacin superior (cure rates:
59 vs. 32%)
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