Cochlear Implantation in Charcot-Marie-Tooth Patients: Speech Perception and Quality of Life

OBJECTIVES

There is a limited understanding of the impact of cochlear implantation (CI) in patients with Charcot-Marie-Tooth disease (CMT), given the scarcity of reported cases. We aim to evaluate the audiological outcomes and quality of life (QoL) after CI in CMT.

METHODS

Multi-institutional, university-affiliated, tertiary-referral centers, retrospective chart review.Our cohort includes 5 patients with CMT. Patients' charts were reviewed for demographic characteristics, operation notes, and pre- and post-implantation audiology evaluation. Patients completed the Cochlear Implant Quality of Life-10 (CIQOL-10) Global questionnaire.

RESULTS

Pre-implantation, the mean pure tone average was 84.1 ± 7.2 dB, and the mean word recognition score was 2.4% in the implanted ear. AzBio sentence test was performed in quiet, revealing a mean of 4 ± 1.4% in the implanted ear. Post-implantation, PTA results were all within the mild hearing loss range (mean 33.0 ± 5.9 dB). Post-CI, AZ-Bio test results were 5%, 65%, and 74% (for 3 patients), and HINT scores were 55% and 58% (for 2 patients). The mean score of the CIQOL-10 questionnaire was 42.7 ± 10.47 (range 1-100). Patients were most satisfied with their ability to listen to the television or radio, have conversations in a quiet environment, and feel comfortable being themselves.

CONCLUSION

To the best of our knowledge, this is the most extensive series of CI in CMT-associated sensorineural hearing loss and auditory neuropathy. Our cohort suggests that CI is a safe and reliable method for hearing rehabilitation that can achieve good speech performance and improve QoL in CMT patients.

Predicting complications of pediatric temporal bone fractures

OBJECTIVE

Our aim is to characterize complications of pediatric temporal bone fractures and identify predictive risk factors associated with fracture complications.

METHODS

A retrospective review was conducted of all temporal bone fractures diagnosed in children (age less than or equal to 18 years) from a single academic institution between 2003 and 2017. Demographics, mechanism of injury, fracture characteristics, computed tomography evaluation and follow-up duration were recorded on each patient. Outcomes measured include facial nerve injury (FNI), cerebrospinal fluid (CSF) leak, sensorineural hearing loss (SNHL), and conductive hearing loss (CHL).

RESULTS

One-hundred-seventeen patients with 129 temporal bone fractures were included in the study. Most fractures were otic capsule sparing (OCS) (96%, n = 124) and longitudinal (71%, n = 91). Otic capsule violating (OCV) fractures were associated with higher CSF leak rates (20% versus 2%, p = 0.14) and FNI rates (60% versus 5%, p = 0.002) compared to OCS fractures. Audiograms were available in 37 patients (34%). Patients with Glasgow coma scale (GCS) consistent with a mild traumatic brain injury (TBI) (GCS > 13) had significantly fewer complications (FNI and CSF leaks) compared to the group with moderate and severe TBI (GCS < 13), 5% versus 23% (p = 0.03).

CONCLUSIONS

Higher complication rates are seen with OCV fractures and transverse fractures. Moderate and severe TBI as measured by GCS is predictive of FNI and CSF complications in pediatric temporal bone fractures.

Treatment of Temporal Bone Fractures

Traumatic injury to the temporal bone can lead to significant morbidity or mortality and knowledge of the pertinent anatomy, pathophysiology of injury, and appropriate management strategies is critical for successful recovery and rehabilitation of such injured patients. Most temporal bone fractures are caused by motor vehicle accidents. Temporal bone fractures are best classified as either otic capsule sparing or otic capsule disrupting-type fractures, as such classification correlates well with risk of concomitant functional complications. The most common complications of temporal bone fractures are facial nerve injury, cerebrospinal fluid (CSF) leak, and hearing loss. Assessment of facial nerve function as soon as possible following injury greatly facilitates clinical decision making. Use of prophylactic antibiotics in the setting of CSF leak is controversial; however, following critical analysis and interpretation of the existing classic and contemporary literature, we believe its use is absolutely warranted.

Inhibition of Post-Meningitic Cochlear Injury with Cerebrospinal Fluid Irrigation

OBJECTIVE: Labyrinthitis ossificans, the pathologic ossification of the otic capsule associated with profound deafness and loss of vestibular function occurs frequently as a sequella of bacterial meningitis and subsequent purulent labyrinthitis. Experimentally, in Streptococcus pneumoniae meningitis, it has been shown that a vigorous inflammatory response to teichoic acids in the bacterial cell wall contributes to cochlear damage and subsequent fibrosis and ossification. The hypothesis of this study is that a dilution of concentration of inflammatory mediators through cerebrospinal fluid (CSF) irrigation will lead to a reduction in both inner ear pathology and permanent hearing loss.

STUDY DESIGN AND SETTING: Auditory brainstem response testing was used to determine baseline hearing thresholds in 20 Mongolian gerbils (12 irrigated, 8 sham irrigated animals) at 32 kHz, 16 kHz, 8 kHz, and 4 kHz frequencies. Their thresholds at 14 days and 120 days post-procedure were also obtained. Streptococcus pneumoniae meningitis was induced in both groups of animals by intrathecal (i.t.) injection of bacteria. Both groups received penicillin treatment. Forty-eight hours after inoculation, both groups were implanted with i.t. inflow and outflow catheters. The irrigated group was infused continuously with artificial CSF over 36 hr at a rate of 70 μL/hr and the outflow sampled. The tubing in the sham irrigated group was clamped (without sampling). They were sacrificed at 120 days post-procedure and histomorphometric analysis carried out. The concentration of interleukin 1β (IL-1β) for the CSF samples from the irrigated group were compared to samples collected from an additional control group of 8 non-irrigated meningitic gerbils. IL-1β was chosen to study because it is a potent pro-inflammatory cytokines in bacterial meningitis that is unaffected by the neurosurgical trauma of the experimental protocol.

RESULTS: Twenty animals survived the meningitis (6 irrigation, 6 sham irrigation, 8 non-irrigation meningitic controls). At Days 14 and 120 post-infection, the irrigated animals manifested significantly less hearing loss with a mean loss of 28.82 dB compared to the sham irrigation group mean loss of 40.76 dB ( P < 0.03). The degree of hearing loss in both groups was frequency-dependent with greater loss at higher frequencies (mean loss = 22.4 dB at 32 kHz, 23.0 dB at 16 kHz, 18.6 dB at 8 kHz, and 12.5 dB at 4 kHz). Histomorphometric analysis demonstrated a marked reduction in degeneration of the spiral ligament, spiral ganglion cells, and stria vascularis in experimental animals as compared to controls. Immunohistochemistry showed a significant reduction in IL-β1 concentrations in the irrigated animals compared to the non-irrigated, infected controls ( P < 0.03).

CONCLUSIONS: Irrigation of CSF resulted in a significant reduction in post-meningitic cochlear injury when compared to controls. This model for continuous cerebrospinal fluid irrigation provides a means to evaluate the effects of a dilution of inflammatory mediators on hearing loss and labyrinthitis ossificans after bacterial meningitis.

SIGNIFICANCE: Despite advances in the prevention of meningitis and improved antibiotic treatment, bacterial meningitis continues to have significant associated morbidity. This study provides insight into some of the mechanisms responsible for post-meningitic hearing loss and labyrinthitis ossificans and presents a novel approach to reduce these complications.

EBM rating: C-4

The Effects of Superoxide Dismutase in Gerbils with Bacterial Meningitis

BACKGROUND: Inflammatory products, such as oxygen radicals generated during the course of bacterial meningitis, can damage nerve endings, hair cells, and/or supporting cells in the cochlea. Superoxide dismutase (SOD), an O2-scavenger, has been shown to play an important role in the protection against radical toxicity in various animal experiments.

OBJECTIVE: To study the antioxidant effects of SOD on the inflammatory response of gerbils with bacterial meningitis.

STUDY DESIGN: Meningitis was induced in three groups of 10 gerbils by intrathecal (IT) injection of Streptococcus pneumoniae into the cisterna magna. Group 1 received IT SOD, group 2 received intramuscular (IM) SOD, and group 3, the control group, received IM normal saline. Histologic data and auditory brainstem responses (ABR) were obtained from each gerbil.

RESULTS: Fibrosis and/or neo-ossification were near absent in the IT SOD group and significantly less fibrosis occurred in the IM group (IT vs. IM: P = 0.010; IT vs. control group: P = 0.001). The amount of surviving spiral ganglion cells correlated inversely with the extent of fibrosis (r = −0.753, P < 0.00001).

CONCLUSIONS: IT injection of SOD significantly reduced cochlear fibrosis and neo-ossification, reduced the spiral ganglion cell loss, and decreased damage of the cochlear components following bacterial meningitis.

Laryngotracheal transplantation: technical modifications and functional outcomes

OBJECTIVES/HYPOTHESIS

Laryngeal transplantation offers the potential for patients without a larynx to recover their voice, which is critical in our communication age. We report clinical and functional outcomes from a laryngotracheal transplant. Widespread adoption of this technique has been slowed due to the ethical concerns of life-long immunosuppression after a nonvital organ transplant. Our patient was already on immunosuppressive medication from prior kidney-pancreas transplantation, and therefore was not exposed to added long-term risk. We describe the unique technical advances, clinical course, and rehabilitation of this patient and the implications for future laryngeal transplantation.

STUDY DESIGN

Case report.

METHODS

A laryngotracheal transplantation was performed in a 51-year-old prior kidney-pancreas transplant recipient presenting with complete laryngotracheal stenosis. Surgical modifications were made in the previously described technique related to retrieval, vascular supply, and reinnervation. This resulted in a robustly vascularized organ with well-perfused long-segment tracheal transplant and early return of motor reinnervation.

RESULTS

A multidisciplinary approach resulted in a successful transplant without evidence of rejection to date. Postoperatively, the patient continues to rely on a tracheotomy but has had the return of an oral and nasal airway, vocalization, smell, and taste, all experienced for the first time in 11 years.

CONCLUSIONS

We have demonstrated that our methods may result in a successful laryngotracheal transplant. We describe the preparation, surgical technique, rehabilitation, and interventions employed in achieving optimal outcomes. This report contributes valuable information on this rarely performed composite transplant.

Role of Tumor Necrosis Factor-α in Sensorineural Hearing Loss after Bacterial Meningitis

HYPOTHESIS

Blockade of tumor necrosis factor-alpha with tumor necrosis factor-alpha antibody will reduce the extent of cochlear injury and hearing loss associated with Streptococcus pneumoniae meningitis.

BACKGROUND

Inflammatory mediators play a significant role in the morbidity associated with bacterial meningitis, including hearing loss and labyrinthitis ossificans. Previous studies have shown the attenuation of hearing loss by the nonspecific blockade of such pathways.

METHODS

Fifty Mongolian gerbils were divided into four groups. Auditory brainstem response testing was conducted to measure hearing thresholds. Streptococcus pneumoniae meningitis was induced in Groups 1 and 2. Group 2 was then given a single intraperitoneal injection of tumor necrosis factor-alpha antibody, whereas Group 1 received phosphate-buffered saline. Uninfected animals in Groups 3 and 4 were implanted with osmotic pumps that delivered a continuous 8-day intrathecal flow of either tumor necrosis factor-alpha (Group 4) or phosphate-buffered saline (Group 3). After 6 weeks, auditory brainstem response testing was repeated. The cochleas were harvested and analyzed histomorphometrically.

RESULTS

Group 2 animals with Streptococcus pneumoniae meningitis that also received tumor necrosis factor-alpha antibody developed significantly less hearing loss than Group 1 animals with meningitis alone. The decrease in the average threshold at 4, 8, 16, and 32 kHz was 31, 30, 25, and 28 dB sound pressure level, respectively (p < 0.0092 for each). Furthermore, histomorphometric analysis showed significantly less damage to the organ of Corti, spiral ganglion, spiral ligament, and stria vascularis in Group 2. Conversely, tumor necrosis factor-alpha induced meningitis animals (Group 3) showed increased hearing loss compared with phosphate-buffered saline controls (Group 4), with p < 0.0001 at all frequencies.

CONCLUSION

Tumor necrosis factor-alpha plays an important role in cochlear injury after bacterial meningitis. Blockade of tumor necrosis factor-alpha reduces postmeningitic hearing loss and cochlear injury. Induction of meningitis with intrathecal tumor necrosis factor-alpha also resulted in hearing loss and cochlear injury similar to bacterial meningitis.

Fine structure histopathology of labyrinthitis ossificans in the gerbil model

Labyrinthitis ossificans (LO) is the pathological deposition of new bone within the lumen of the cochlea and labyrinth. This process occurs most commonly as a result of infection or inflammation affecting the otic capsule. Trauma and vascular compromise can also lead to neo-ossification within the otic capsule. The mechanism that regulates this process remains unestablished. This study details the end-stage histopathology in high-resolution plastic thin sections. Twenty Mongolian gerbils were infected by intrathecal injection of Streptococcus pneumoniae type 3 followed by subcutaneous penicillin G procaine (8 days) and were painlessly sacrificed 3 months later. The cochleas were serially divided and sectioned for light and electron microscopy. Sixteen of 20 animals (27 of 40 cochleas) demonstrated LO. Cochlear damage was most extensive in the vestibule and basal turn and decreased toward the apex, which often appeared normal. The histopathologic findings consisted of 1) new bone, calcospherites, osteoid, and fibrosis without dense connective tissue or osteoblasts extending from the endosteal wall into the lumen of the vestibule and scala tympani; 2) areas of dense connective tissue and osteoid enclosed by epithelial cells conjoined with the organ of Corti, stria vascularis, spiral ligament, and vestibular (Reissner's) membrane; and 3) partial to complete loss of the organ of Corti, spiral ligament cell bodies, stria vascularis, and spiral ganglion cells. Osteoblastic activity was not demonstrated in end-stage ossification in LO in the gerbil model. Neo-ossification appears to occur by calcospherite deposition along collagen-like fibrils within osteoid. The destruction of the organ of Corti, spiral ganglion cells, stria vascularis, and cells of Reissner's membrane and the spiral ligament occurs even in the absence of ossification of the cochlear duct.

Location and Timing of Initial Osteoid Deposition in Postmeningitic Labyrinthitis Ossificans Determined by Multiple Fluorescent Labels

OBJECTIVES/HYPOTHESIS

Variable amounts of fibrosis and neo-ossification fill the cochlea following bacterial meningitis. The purpose of the study was to delineate the timing and location of initial ossification following pneumococcal meningitis, as well as subsequent remodeling and resorption, over the 3-month period after infection.

STUDY DESIGN

Randomized, double-blind study.

METHODS

Fluorochromes are compounds that specifically incorporate into ossifying bone. Sequential addition of different colored fluorochromes during osteoneogenesis define the timing and location of osteoid deposition and mineralization. Mongolian gerbils were infected by intrathecal injection of Streptococcus pneumoniae type 3, and control gerbils received saline. Both groups were injected with calcein on postoperative day 3, followed by xylenol orange, oxytetracycline, and alizarin red on days 7, 14, and 28 respectively. Ten experimental gerbils were killed 24 hours after each label, and an additional group at 84 days after infection. Two groups of 10 control gerbils were killed at 29 and 84 days after treatment. The temporal bones and tibias were harvested, embedded in plastic, and sliced with a diamond saw. Wafers at a thickness of 200 microm were mounted in sequence and examined.

RESULTS

Sixteen of 49 experimental animals (33%) were positive for at least one of the fluorescent labels. Fluorescent labeled osteoid was present at all sampling times. Label extended from the endosteal wall into the lumen of the scala tympani between the vestibule and the round window membrane. Discrete sites of fluorescence varied among specimens and were associated with the opening of the cochlear aqueduct, the scala tympani, organ of Corti, and the stria vascularis and spiral ligament in all turns from base to apex.

CONCLUSION

The results indicate that osteoid is deposited and begins mineralization by day 3 after infection, at least, and continues, at least, through the first 28 days after infection. There was no apparent resorption of new bone and remodeling by 84 days after infection.

Choristoma of the Middle Ear: A Component of a New Syndrome?

CASE REPORT

Salivary choristoma of the middle ear is a rare entity. The authors report the 26th known case, which is unique in several respects: the patient had abnormalities of the first and second branchial arches, as well as the otic capsule and facial nerve in ways not yet reported. Our patient presented with bilateral preauricular pits, conchal bands, an ipsilateral facial palsy, and bilateral Mondini-type deformities. A review of the literature revealed salivary choristomas of the middle ear to be frequently associated with branchial arch abnormalities, most commonly the second, as well as abnormalities of the facial nerve.

REVIEW OF THE LITERATURE

All 25 cases were reviewed and the results reported with respect to clinical presentation, associated abnormalities, operative findings, and hearing results. It has been proposed that choristoma of the middle ear may represent a component of a syndrome along with unilateral hearing loss, abnormalities of the incus and/or stapes, and anomalies of the facial nerve.

CONCLUSION

Eighty-six percent of the reported patients with choristoma have three or four of the four criteria listed to designate middle ear salivary choristoma as part of a syndrome. In the remaining four patients, all of the structures were not assessed.

MR, CT, and plain film imaging of the developing skull base in fetal specimens

BACKGROUND AND PURPOSE

The developing fetal skull base has previously been studied via dissection and low-resolution CT. Most of the central skull base develops from endochondral ossification through an intermediary chondrocranium. We traced the development of the normal fetal skull base by using plain radiography, MR imaging, and CT.

METHODS

Twenty-nine formalin-fixed fetal specimens ranging from 9 to 24 weeks' gestational age were examined with mammographic plain radiography, CT, and MR imaging. Skull base development and ossification were assessed.

RESULTS

The postsphenoid cartilages enclose the pituitary and fuse to form the basisphenoid, from which the sella turcica and the posterior body of the sphenoid bone originate. The presphenoid cartilages will form the anterior body of the sphenoid bone. Portions of the presphenoid cartilage give rise to the mesethmoid cartilage, which forms the central portion of the anterior skull base. Ossification begins in the occipital bone (12 weeks) and progresses anteriorly. The postsphenoid (14 weeks) and then the presphenoid portion (17 weeks) of the sphenoid bone ossify. Ossification is seen laterally (16 weeks) in the orbitosphenoid, which contributes to the lesser wing of the sphenoid, and the alisphenoid (15 weeks), which forms the greater wing.

CONCLUSION

MR imaging can show early progressive ossification of the cartilaginous skull base and its relation to intracranial structures. The study of fetal developmental anatomy may lead to a better understanding of abnormalities of the skull base.

Effects of depletion of complement in the development of labyrinthitis ossificans

HYPOTHESIS

Labyrinthitis ossificans results in part from the intense inflammatory response to Streptococcus pneumoniae cell wall components. Depletion of complement in Mongolian gerbils following induction of meningitis will reduce the degree of inflammation and subsequent cochlear fibrosis.

STUDY DESIGN

Random prospective study. Histological evaluations were performed with the researcher blinded to the experimental group

METHODS

S. pneumoniae meningitis was induced in 10 control and 18 experimental Mongolian gerbils with an intrathecal injection of the bacteria. Both groups of animals received treatment with penicillin. The experimental group was also treated with cobra venom factor to deplete complement in the animals. Three months after the induction of meningitis, the animals' temporal bones were harvested for histological evaluation.

RESULTS

The decomplemented animals developed significantly less intracochlear fibrosis (P < .01). The mortality rate for the experimental group was 11% compared with 40% in the control group (P = .14).

CONCLUSIONS

Reduction of the intense inflammatory response to the S. pneumoniae cell wall components in suppurative labyrinthitis secondary to bacterial meningitis reduced the degree of labyrinthitis ossificans.

The efficacy of perioperative steroid therapy in pediatric primary palatoplasty

OBJECTIVE

To determine if perioperative steroid therapy benefits pediatric primary palatoplasty patients.

DESIGN

A prospective, double-blind, randomized trial with a placebo control.

SETTING

An academic medical center.

PATIENTS

Forty-five children undergoing primary repair of their cleft palate between 1989 and 1996 who were under the age of 48 months and without developmental delay or any associated syndrome.

INTERVENTIONS

Intravenous dexamethasone sodium phosphate (0.25 mg/kg) or a placebo (5% dextrose in water) immediately preoperatively and once every 8 hours for two doses postoperatively.

MAIN OUTCOME MEASURES

Postoperative airway distress, fever, oral fluid intake, discharge eligibility, and palatal fistula formation.

RESULTS

Perioperative steroid therapy significantly reduced the incidence of postoperative airway distress (p = .05) and postoperative fever (p = .02); postoperative oral fluid intake, discharge eligibility, and palatal fistula formation were not significantly affected.

CONCLUSIONS

Perioperative steroids effectively lower the risk of postoperative airway distress and postoperative fever in children undergoing the primary repair of their cleft palate. This finding favors a customary role for perioperative steroid therapy in pediatric primary palatoplasty.

Chronology of labyrinthitis ossificans induced by Streptococcus pneumoniae meningitis

OBJECTIVE

Labyrinthitis ossificans consists of novel osteogenesis that fills the normally patent cochlear and vestibular lumen as an end-stage sequelae to various pathologies. This study was designed to establish the sequence of events and chronology of the osteoneogenesis and calcification.

STUDY DESIGN

A prospective randomized double-blind study.

METHODS

By using serial application of different colored fluorochromes, which deposit in newly forming bone, the timing of bone deposition and bone remodeling can be established. Labyrinthitis ossificans was induced in six groups (n = 5) of gerbils by an intrathecal injection of live Streptococcus pneumoniae. Group 1 received no fluorochrome labels, group 2 received one label, group 3 received three labels, and groups 4, 5, and 6 received four labels. The temporal bones were harvested after 2 weeks (group 1), 1 month (group 2), 3 months (group 3), 4 months (group 4), 6 months (group 5), and 12 months (group 6).

RESULTS

Sixteen of the 25 animals that received labels developed ossification, demonstrated with fluorescent microscopy. In the animals that developed labyrinthitis ossificans, newly formed disorganized bone began calcifying as early as 3 weeks (label 1) after S. pneumoniae injection. Osteoneogenesis continued as evidenced by the presence of the other labels when first applied at 6 weeks (label 2), and 10 weeks (label 3). Ossification, calcification, and remodeling proceeded through a 12-month course, wherein a reduction of labels was present at 6 months and total disappearance by 12 months.

CONCLUSIONS

The use of fluorescent stains in this animal model provides a means to establish a timeline of the ossification seen in labyrinthitis ossificans.

Induction of labyrinthitis ossificans after pneumococcal meningitis: an animal model

Newly formed disorganized bone fills the open spaces within the otic capsule in various pathologic conditions, resulting in labyrinthitis ossificans. The pathologic mechanisms of this disease remain poorly understood. To better study the sequence of events and contributing mechanisms involved in labyrinthitis ossificans, an animal model was developed. Three groups of Mongolian gerbils received either an intralabyrinthine injection of normal saline solution (group 1) or Streptococcus pneumoniae polysaccharide capsule antigens (groups 2 and 3). The temporal bones were harvested after 3 months and serially sectioned. None of the eight control animals (group 1), which received intralabyrinthine injections of normal saline solution had any histologic changes in their temporal bones. Nine of the surviving 19 animals in groups 2 and 3 had fibrosis or evidence of early ossification. A fourth group of Mongolian gerbils received two intrathecal injections of live S. pneumoniae organisms. The temporal bones were harvested after 3 months and serially sectioned. Fourteen of the surviving 15 animals had fibrosis or ossification or both. This animal model will provide a method for study of the mechanisms of labyrinthitis ossificans.

Removal of a cholesteatoma in a dog, using a caudal auricular approach

A new surgical method for treating cholesteatoma in dogs is described. Although rarely reported in dogs, cholesteatomas may be more common than previously believed. Complete excision of a cholesteatoma is associated with low recurrence and good long-term prognosis. Surgical intervention, with total ear canal ablation and lateral bulla osteotomy, has been recommended in dogs with tumors of the middle ear; however, this technique often results in conductive hearing loss. Through a caudal auricular approach to the tympanic bulla, we were able to preserve the external ear canal, reconstruct the auditory ossicles, and graft the tympanic membrane. Results of brain stem auditory-evoked response tests in the dog revealed intact conduction potentials. A caudal auricular approach to the tympanic bulla is technically possible, preserves normal appearance, and may maintain, or even improve, hearing conduction of affected ears in dogs.

Prophylactic antibiotics for posttraumatic cerebrospinal fluid fistulae. A meta-analysis

OBJECTIVE

To determine the efficacy of prophylactic antibiotics in the treatment of posttraumatic cerebrospinal fluid fistulae.

DESIGN

Meta-analysis with literature review.

METHODS

A MEDLINE search was performed to obtain all the reports pertaining to posttraumatic cerebrospinal fluid fistulae between 1970 and 1995. All the series that provided data specifying whether prophylactic antibiotics were provided and the incidence of the meningitis were included in the analysis.

RESULTS

The findings of 6 studies, involving 324 patients, were analyzed. In these studies, 237 received prophylactic antibiotics and 87 did not. Only 6 of the 237 patients who received prophylactic antibiotics developed meningitis, yielding an incidence of 2.5%. Nine (10%) of the 87 patients who did not receive prophylactic antibiotics developed meningitis. The incidence of meningitis was significantly lower in the patients who received prophylactic antibiotics than in those who did not receive prophylaxis (Fisher exact test, P = .006).

CONCLUSIONS

Individually, each of the studies included in this analysis demonstrated no significant difference in the incidence of meningitis with prophylactic antibiotic therapy. The reason for this is that inadequate numbers of patients were available at each institution. Pooling the data from the past 25 years revealed a statistically significant reduction in the incidence of meningitis with prophylactic antibiotic therapy.

Management of complications from 820 temporal bone fractures

OBJECTIVE

To review the incidence of complications resulting from temporal bone fractures and analyze the outcomes from surgical and nonsurgical management.

STUDY DESIGN

A retrospective review of 699 patients with 820 temporal bone fractures occurring over a 5-year period.

SETTING

A single level 1 trauma center.

PATIENTS

All patients with clinical or radiologic evidence of a temporal bone fracture.

RESULTS

A total of 820 fractured temporal bones resulted in 58 facial nerve injuries, 122 CSF fistulae, and 15 cases of meningitis. The two most important prognostic factors in recovery of facial paralysis were severity and delay of onset. All patients with incomplete paralysis recovered. All but one of the delayed onset palsies had good recovery of function. A total of 40% of patients with immediate onset complete paralysis had poor recovery of function. Ninety-five of the 122 CSF fistulae closed spontaneously within 1 week. CSF fistulae persisting for > 7 days had a significantly increased risk of developing meningitis (23%) compared with patients whose fistulae closed within 7 days (3%) (p = 0.001). Another important risk factor for the development of meningitis was concurrent infection.

CONCLUSIONS

Facial function following temporal bone fractures should be evaluated in the emergency room. If facial motion is noted at any time after the injury, surgical intervention is rarely indicated. Prophylactic antibiotics should be considered in temporal bone fractures when CSF fistulae are present. Surgical closure of a CSF fistula is indicated if it persists for > 7-10 days.

Venous Channels of the Petrous Apex: Their Presence and Clinical Importance

A methyl methacrylate casting technique was used to make detailed casts of the intracerebral venous system of four human cadaver specimens. Seven of the eight petrous apices studied were diploeic (n = 5), or pneumatic (n = 2) and had venules coursing in the anterior petrous apex. These venules form conduits connecting the cavernous to the inferior petrosal sinus or the jugular bulb and have not been previously described. In addition to the air cell system of the petrous apex, these venules may represent pathways for the spread of infection and the development of petrous apicitis, Gradenigo's syndrome, and the rare otogenic cavernous sinus thrombophlebitis. Their presence also may help explain the location of cholesterol granulomas, which afflict this area of the skull base.

Venous channels of the petrous apex: their presence and clinical importance

A methyl methacrylate casting technique was used to make detailed casts of the intracerebral venous system of four human cadaver specimens. Seven of the eight petrous apices studied were diploeic (n = 5), or pneumatic (n = 2) and had venules coursing in the anterior petrous apex. These venules form conduits connecting the cavernous to the inferior petrosal sinus or the jugular bulb and have not been previously described. In addition to the air cell system of the petrous apex, these venules may represent pathways for the spread of infection and the development of petrous apicitis, Gradenigo's syndrome, and the rare otogenic cavernous sinus thrombophlebitis. Their presence also may help explain the location of cholesterol granulomas, which afflict this area of the skull base.

Imaging findings of the developing temporal bone in fetal specimens

PURPOSE

To trace the development of the normal fetal temporal bone by means of plain radiography, MR, and CT.

METHODS

Eighteen formalin-fixed fetal specimens, 13.5 to 24.4 weeks' gestational age, were examined with a mammographic plain film technique, CT, and MR imaging at 1.5 T. Temporal bone development and ossification were assessed.

RESULTS

The membranous labyrinth grows with amazing rapidity and attains adult size by the middle of the gestation period. The cochlea, vestibule, and semicircular canals are very prominent and easily recognized on MR images. The otic capsule develops from a cartilage model. Ossification of the otic capsule proceeds rapidly between 18 and 24 weeks from multiple ossification centers that replace the cartilaginous framework. The mastoid, internal auditory canal, vestibular aqueduct, and external auditory canal continue to grow after birth.

CONCLUSION

The study of fetal developmental anatomy may lead to a better understanding of congenital disorders of the ear. Faster MR scanning techniques may provide a method for in utero evaluation of the fetal temporal bone.

A prospective, double-blind, randomized study of the effects of perioperative steroids on palatoplasty patients

OBJECTIVE

To determine whether perioperative steroids affect the outcome of patients who undergo palatoplasty.

DESIGN

A prospective, double-blind, randomized study.

SETTING

A university medical center.

PATIENTS

Twenty patients undergoing primary repair of a cleft palate.

INTERVENTION

A prospective double-blind technique was used to randomly assign patients to receive a placebo or dexamethasone sodium phosphate perioperatively.

MAIN OUTCOME MEASURE

Patients were monitored for postoperative airway distress, fever, oral fluid intake, days of hospitalization, and wound healing.

RESULTS

The use of perioperative steroids was associated with shorter hospitalizations. No adverse sequelae from the administration of steroids were identified.

CONCLUSIONS

In our current managed care environment, the use of perioperative steroids may play an important role in reducing health care costs.

Dexamethasone inhibition of the development of dysplastic bony lesions in LP/J mice

Inbred LP/J mice have been observed to spontaneously develop abnormal bony lesions of the ossicles and otic capsule that progress throughout the life of the animals. This genetically inherited murine disorder produces bony lesions that share some gross and histologic features with bony lesions seen in human tympanosclerosis. Previous studies on LP/J mice have demonstrated evidence of immunologically mediated injury in the progression of the newly forming bony lesions. This study was designed to examine the effects of dexamethasone on the development of the bony lesions in LP/J mice. The purpose was to attempt to elucidate the relationship of the immunologic injury observed in earlier studies and the progression of the dysplastic bony lesions. The results show that LP/J mice treated with dexamethasone developed significantly fewer dysplastic bony lesions compared to the age-matched, saline-treated controls. There was also a statistically significant difference in the quantity and cellularity of the middle ear effusions between the experimental and control animals.

Macrothrombocytopenia and progressive deafness: a new genetic syndrome

We report a kindred with hereditary macrothrombocytopenia and progressive sensorineural hearing loss. Although the occurrence of hereditary sensorineural hearing loss associated with macrothrombocytopenia has been reported in a small number of families, varying degrees of renal pathology have always been present. In contrast to the previously reported syndromes involving a giant-platelet disorder and deafness, none of the family members in this report have had any evidence of renal dysfunction. The disorder was inherited in a linear pattern from great-grandmother to grandmother to mother to daughter. The clinical manifestations include hearing impairment that begins before the third decade and progresses to severe to profound bilateral hearing loss by the fourth decade. The platelet disorder manifests in early childhood and persists lifelong, although it tends to remain subclinical. Hematologic and ultrastructural findings will be contrasted to those found in Alport syndrome.

The possible role of immunologic injury in the dysplastic bony lesion in LP/J mice

An immunohistologic study was performed on temporal bones from 30 LP/J mice and 17 CBA/J mice to assess the role of immunologic injury in the pathogenesis of dysplastic bony lesions in LP/J mice. Temporal bones were harvested from animals aged 2 to 31 months to evaluate the progression of the disease. As early as 2 months of age, before the onset of bony lesions, the tympanic cavities frequently contained small effusions coating the ossicles and otic capsules that were demonstrated to contain immunoglobulins and pockets of macrophages. Later in the course of the disease, bony lesions grossly and histologically similar to human otosclerosis developed, which stained for immunoglobulins. No similar bony lesions, effusions, cellular infiltrates, or staining for immunoglobulins was detected in the control animals, even in the presence of acute otitis media. This study suggests a role of immunologic injury in the pathogenesis of dysplastic bony lesions in LP/J mice.

Suppression of water intake by immune complex formation in the hypothalamus. Implications for systemic lupus erythematosus

Immune complex formation in the perifornical region of the hypothalamus resulted in depressed water consumption in rats, but did not consistently alter body temperature. The antibody with an unrelated antigen did not affect water consumption or body temperature. These results support the notion that immune complex reactions within the central nervous system can alter behavior.

Simple apparatus for blocking small animal brains

A modification of previously described devices for blocking small animal brains is presented. The apparatus is easily constructed and allows for blocking at varous angles of both fixed and unfixed tissue of most small laboratory animals.