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26 Bacterial Infections inChildren andHearing Loss: AnOverview
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26.2.2 Sensorineural Hearing Loss
Sensorineural HL (SNHL) results from damage, disease, or other disorders affect­ing the inner ear (e.g., the cochlea) and/or the auditory (eighth cranial) nerve. Sensorineural HL can be categorized as congenital, including hereditary and nonhe­reditary causes, and acquired. Congenital SNHL may occur secondary to congenital malformations, intrauterine infections, medications, or toxins that have a terato­genic effect on the developing ear of the fetus. Congenital SNHL is mainly caused by cytomegalovirus (CMV), rubella virus, and Zika virus infections or secondary to congenital toxoplasmosis or syphilis. Hearing loss in these conditions frequently is progressive.
26.2.3 Mixed Hearing Loss
Mixed HL refers to a combination of conductive HL and SNHL.
26.3 Congenital Bacterial Infections andHearing Loss
Not so many well-dened bacterial congenital infections exist. The best-dened and well-known congenital bacterial infection is tuberculosis.
26.3.1 Congenital Tuberculosis andHearing Loss
According to the WHO, one-third of the world population has tuberculosis infec­tion, and 20 million people suffer from the tuberculosis disease [7]. On the other hand, congenital tuberculosis (cTB) is rarely seen, and the actual incidence is unknown. Also, it is challenging to differentiate cTB from postnatally acquired tuberculosis disease. The onset of cTB is heterogeneous in the age of presentation; clinical signs and symptoms may differ with age. It may be asymptomatic at birth, and many symptoms can occur within days to weeks.
Congenital tuberculosis occurs after Mycobacterium tuberculosis complex bacil­laemia during pregnancy, leading to infection of the placenta or the maternal genital tract. After that, the mycobacteria may pass to the fetus hematogenous from the placenta to the umbilical vein or by the aspiration or ingestion of amniotic uid [8]. The hematogenous spread may lead to one or more primary complexes in the liver or lungs. Also, aspiration or ingestion of infected amniotic uid results in primary complex formation in the lungs or gastrointestinal tract. The liver and lungs are the two most involved sites in cTB [9]. The rst diagnostic criteria for cTB were dened by Beitzke in 1935 [10]. Cantwell etal. [11] revised the criteria for the diagnosis of cTB in 1994, and up to 1982, less than 300 cases of cTB were reported [11].
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According to the Cantwell criteria, the infant must have proved tuberculous lesions, plus at least one of the followings should be met for the diagnosis of cTB: (1) detection of tuberculosis-specic lesions in the rst week of life, (2) presence of a primary hepatic complex or caseating granulomas, (3) documented tuberculosis infection of the endometrium or placenta, or (4) exclusion of the possibility of post­natal transmission by a thorough investigation of contacts, including the infant’s hospital attendants, and by adherence to existing recommendations for treating infants exposed to tuberculosis [11].
Congenital tuberculosis symptoms may present at birth but are more common in the rst 2–4 weeks of life. Clinical manifestations of cTB may be varied, non­specic, and difcult to differentiate from neonatal bacterial or viral sepsis. The mortality rate of cTB is 21–100% [12]. Also, central nervous system (CNS) involve­ment in cTB is higher [9]. Many CNS-related complications, such as encephaloma­lacia, hydrocephalus, cerebral infarction, and cerebral atrophy, can be seen if the patients survive [13]. The CNS-related complications might lead to HL, but the incidence of HL related to cTB is unknown. Since not many reported cases exist, data about cTB and HL could be obtained from published case reports and series. However, a hearing evaluation was not done or mentioned in most of these reports.
Peng etal. [12] analyzed 170 cases of cTB in the literature between 1946 and
2009. Excluding one case of giving up treatment, 68 (40%) patients died of 169, and HL was detected in 1.5% of the survivors. Li etal. [9] reviewed Chinese journals reporting 92 cTB cases between 1976 and 2018in China. Forty (44%) patients died, among the survivors, eight were cured, and 39 patients improved. However, the authors did not mention long-term sequelae, including HL [9]. Du etal. [14] reported 10 cases of cTB treated in Beijing Children’s Hospital, between 2009 and 2018 that were followed up for at least 6months. Among 10 cTB cases, hearing scanning was not done in seven patients, but three cases passed hearing tests. Chotpitayasunondh etal. [15] reported nine cTB cases diagnosed from 1979 to 1998; the fatality rate was 33.3%, and no sequelae were found in the survivors.
Hearing impairment in cTB could be secondary to ear involvement. Aldan­Aguirre etal. [16] reported a premature infant of 25weeks’ gestational age pre­sented at 8weeks with otorrhea from the left ear, later developing facial paralysis and cervical lymphadenitis. Cultures from ear discharge and the biopsy material taken during a surgical procedure revealed the presence of the M. tuberculosis com­plex. The patient developed necrotizing otitis media, left temporal bone osteomyeli­tis, and cervical lymphadenitis. The infant’s mother was found to have an endometrial biopsy positive for M. tuberculosis, suggesting a cTB diagnosis. After initiating anti-TB treatment, the brainstem auditory-evoked response (BAER) test showed a mild left-sided conductive HL with a normal sensory reserve for both ears [16]. Ng etal. [17] reported a premature infant of 28weeks gestational age with congenital tuberculous otitis that led to ipsilateral HL detected by the BAER test.
Although TB in the newborn period may present as otomastoiditis, isolated otitis media without systemic involvement is rare, and so far, only a few cases have been reported. Naranbhai etal. [18] reported two premature infants with isolated ear discharge diagnosed with congenital tuberculous otitis treated successfully without sequelae.
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26.4 Acute Bacterial Meningitis andHearing Loss
26.4.1 Acute Bacterial Meningitis inNeonatal Period
Acute bacterial meningitis (ABM) is more commonly seen in the rst 28days of life than in another period [19]. The incidence of ABM in the neonatal period ranges from 0.25 to 0.32 per 1000 live births [20, 21]. However, the prevalence of HL may be 10–20 times higher in high-risk infants who require treatment in neonatal inten­sive care units (NICUs) [22].
26.4.1.1 Etiology
In high-income countries, Streptococcus agalactiae (group B streptococcus [GBS]), Escherichia coli, and other gram-negative bacilli are the most common causes of
neonatal meningitis [23]. Moreover, Enterococcus spp., coagulase-negative staphy­lococci (CONS), Staphylococcus aureus, Listeria monocytogenes, Streptococcus pyogenes (group A streptococcus [GAS]), and alpha-hemolytic streptococci can cause ABM, especially among preterm and very low birth weight (VLBW, <1500g) infants [24]. Neisseria meningitidis, Streptococcus pneumoniae, and non-typeable Haemophilus inuenzae also rarely cause meningitis in newborn infants. On the other hand, in low- and middle-income countries, the etiology of ABM in infants differs geographically, but GBS remains a prominent cause [25].
26.4.1.2 Hearing Loss Related toNeonatal Acute
Bacterial Meningitis
Neonatal ABM can lead to severe long-term sequelae in 12–29% and mild neuro­logical impairment in 15–38% of survivors [26, 27]. Stevens etal. [28] investigated the long-term outcome of neonatal meningitis between 1985 and 1987in England and Wales. A total of 111 children who had neonatal meningitis were compared with 113 matched controls from their birth hospital and 49 controls from general practices. They were evaluated at nearly a mean age of 9years. The authors reported
3.6% SNHL in the neonatal meningitis group but no occurrence of HL in either control group. Among the neonatal meningitis group, one case (0.9%) had a severe bilateral SNHL and had been infected with E. coli. One had a severe unilateral SNHL and had been infected with a non-E. coli gram-negative bacillus, and one had a moderate unilateral SNHL and had been infected with L. monocytogenes; the fourth child required a hearing aid but could not be tested because of learning dif­culties [28].
Libster etal. [29] investigated long-term outcomes of GBS meningitis in chil­dren between 1988 and 2006in two hospitals in the USA.They determined that 90 children with GBS meningitis and ve patients died during the acute illness. Among 85 survivors, 43 children could be evaluated at the age of 3–12years; 24 (56%) were reported functioning normally, 11 (25%) had mild–moderate, and 8 (19%) had severe long-term neurodevelopmental impairment. Four children (9.5%) were detected as having SNHL.
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Doctor et al. [30] investigated the consequences of meningitis in 64 VLBW infants who had culture-proven episodes of meningitis over 18years from 1977 to
1995. The authors investigated neurodevelopmental outcomes of 39 of 45 (87%) meningitis survivors compared to non-meningitis survivors followed up to 20months of corrected age [30]. Causes of meningitis were CONS in 43%, other gram-positive bacteria in 19%, gram-negative bacteria in 17%, and Candida species in 20% of episodes. They reported HL in 2 (5%) of 39 meningitis survivors and 2% in the control group [30].
Maqbool etal. [31] investigated the incidence of neonatal HL in high-risk neo­nates in a tertiary teaching hospital in India. During the one-year prospective study period, high-risk neonates were screened for hearing impairment using the BAER test. Two hundred neonates aged between 7 and 28days among patients with high risk for HL, such as a family history of hereditary childhood SNHL, intrauterine infections, craniofacial anomalies, including those with morphologic abnormalities of the pinna and ear canal, birth weight<1500g (VLBW), hyperbilirubinemia at a serum level requiring exchange transfusion, ototoxic medications, including but not limited to the aminoglycosides, used for more than 5days or multiple courses or in combination with loop diuretics, bacterial meningitis, Apgar scores of <4 at the rst or<6 at the fth minute, needing mechanical ventilation for more than 5days, stig­mata, or other ndings associated with a syndrome known to include SNHL and/or conductive HL were randomly selected [31]. Among 200 infants, 32 had HL with initial BAER testing. A total of 20 neonates had HL with BAER testing on follow­ up. The signicant risk factors for HL were ototoxic medications, hyperbilirubine­mia requiring exchange transfusion, and perinatal asphyxia in 45%, 30%, and 26% of neonates with high risk, respectively. Bacterial meningitis was present in 10% of neonates. The presence of meningitis, stigmata, and/or syndrome associated with HL and craniofacial anomalies was found to be independent risk factors for HL in high-risk infant groups.
Thangavelu et al. [32] investigated HL in 4512 neonates hospitalized in the NICU in Germany between 2009 and 2014. They found the prevalence of HL at
1.6% and permanent HL at 0.9%. They revealed that craniofacial anomalies, hyper­bilirubinemia requiring exchange transfusion, oxygen supplementation to a new­born with gestation age 36weeks or older, and hydrops fetalis were associated with permanent HL.On the other hand, commonly known risk factors such as perinatal infections, meningitis, sepsis, and ototoxic drugs did not show signicance related to HL in the study cohort. Coenraad etal. [33] investigated risk factors in infants with SNHL diagnosed after failure on neonatal hearing screening (NHS) admitted to the NICU between 2004 and 2009in Rotterdam. Each patient was matched with two same-gender and postconceptional age controls. A total of 3316 infants were screened with BAER testing, and SNHL was diagnosed in 58 infants. They revealed that the presence of dysmorphic features, low APGAR score at 1min, sepsis, men­ingitis, cerebral bleeding, and cerebral infarction were signicantly related to SNHL [33].
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26.4.2 Acute Bacterial Meningitis Beyond Neonatal Period
Bacterial meningitis causes 250,000 deaths worldwide yearly and severe disabilities in survivors [34]. Permanent HL rates range from 2.5% to 18% in children with bacterial meningitis [3538]. Invasion of bacteria to the cochlea and labyrinth, dam­age to the eighth cranial nerve by bacterial toxins, disruption of microcirculation, and toxic effects of antibiotics used in the treatment are among the mechanisms proposed to explain HL.In a study of 124 children aged 4weeks to 16years recently diagnosed with bacterial meningitis from 21 hospitals in England and South Wales, 92 (74%) had meningococcal, 18 (15%) pneumococcal meningitis, and one case each of meningitis due to H. inuenzae type b, L. monocytogenes, and GBS [35]. In the remaining 11 cases (8%), all had cerebrospinal uid (CSF) neutrophil pleocyto­sis, and the pathogen was unknown. All patients showed obvious HL at the initial evaluation. Three children had permanent, 13 (10.5%) had reversible SNHL, and nine recovered within 48h of diagnosis.
The impact on the development of the child after meningitis can be devastating. A cochlear implant offers a serious treatment possibility for severe SNHL develop­ing after ABM.In cases of post-meningitis HL, it is particularly important to place a cochlear implant as early as possible due to possible intracochlear ossication, thus avoiding the insertion of electrodes into the cochlear lumen.
26.4.2.1 Etiology
While ABM is becoming less common in high-income countries because of the widespread use of vaccines against H. inuenzae type b (Hib), S. pneumoniae, and N. meningitidis, and the introduction of intrapartum antibiotic prophylaxis for GBS, ABM still occurs worldwide, with a peak incidence in young children [3941]. After the global introduction of the Hib and pneumococcal conjugate vaccines to the infant immunization schedule, the epidemiology of ABM has been changing, leading to a decrement in ABM incidence [42].
The etiology of ABM in children can vary by age, geographic region, acquisition route, and host factors. For example, GBS and E. coli are the most common patho­gens in neonates and young infants; however, enteric gram-negative bacilli, S. pneu- moniae, and N. meningitidis are less common in this age group. In older infants and children, S. pneumoniae and N. meningitidis are the most common, accounting for approximately 60–70% of cases [43]. Furthermore, N. meningitidis is the most commonly observed pathogen in adolescents, accounting for nearly half of all cases [43]. Even with a 50–60% decline in the overall incidence of pneumococcal menin­gitis in the USA with the widespread pneumococcal vaccination, S. pneumoniae remains the most common cause of ABM in children [44]. The most common fre­quent agents vary from region to region. For example, in the meningitis belt in sub­Saharan Africa, N. meningitidis accounts nearly 50–60% of cases [45]. In the European region, N. meningitidis accounts for approximately 30–50% of cases, fol­lowed by S. pneumoniae (20–40%), GBS (10–15%), and H. inuenzae (5–15%) [46]. In North America, S. pneumoniae is the most frequent pathogen, accounting for 35–60% of cases, followed by N. meningitidis (15–25%), H. inuenzae (15–20%,
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predominantly non-type b in the post-Hib vaccine era), GBS (10–15%), E. coli (7%), and L. monocytogenes (2–3%) [42, 43].
Hearing loss is the most common signicant sequela in survivors of childhood ABM [47]. Also, the most important cause of acquired HL is ABM in childhood, as 10–34% of survivors develop HL with different severity [48].
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26.4.2.2 Hearing Loss Related toStreptococcus
pneumoniae Meningitis
Sensorineural HL after S. pneumoniae meningitis is more frequent as two- to three­fold of HL resulting from meningitis with other bacterial agents in childhood [49,
50]. The rate of HL due to pneumococcal meningitis may range from 20% to 52%
[51]. Adachi etal. [51] reported 155 children with meningitis; 27 (24%) children developed HL, and 13 of them (12%) developed profound HL in 112 children with bacterial growth in CSF culture. Moreover, of 22 patients in whom CSF culture yielded S pneumoniae growth, 11 (50%) developed HL, and seven (32%) showed profound HL.
Karpinen etal. [52] reported HL in Angola in 30% of children with S. pneu- moniae meningitis. Wooley etal. [53] reported that 59 (13.7%) developed HL in 432 children with meningitis, and the HL was bilateral in 44 (74.6%) and unilateral in 15 (25.4%) patients. They also revealed that 15 (23.8%) of the 63 (14.6%) chil­dren with S. pneumoniae meningitis in the 432 cases had resultant HL.Wellman etal. [54] evaluated HL in 79 children with ABM, 68 (86%) underwent hearing testing, 11 (13.9%) of them had an SNHL, and nine (80%) of these cases with SNHL were associated with S. pneumoniae meningitis.
Richardson etal. [35] investigated HL and long-term outcomes of pediatric men­ingitis between 1993 and 1995in England. Etiological agents were N. meningitidis in 92 (74%) and S. pneumoniae in 18 (15%) of a total of 124 children with menin­gitis. In this study, 83 children underwent audiological tests, and three children (2.4%) had permanent SNHL.
Most previous studies reported HL before implementing Hib and conjugated pneumococcal vaccines. According to the largest cohort after the Hib vaccine, HL after non-Hib meningitis developed in 7% of children [49]. The leading risk factors of HL after bacterial non-Hib meningitis were symptoms for 2days before admis­sion, absence of petechiae, CSF glucose 10.8mg/dL, meningitis due to S. pneu- moniae, and presence of ataxia [49, 50].
Although the benet of dexamethasone for the prevention of HL after non-Hib meningitis is controversial, in a recent meta-analysis, it was stated give evidence that the adjunctive administration of dexamethasone has a signicant effect on decreasing the possibility of HL and severe neurological sequelae in children with bacterial meningitis but has no signicant effect on the follow-up mortality [55, 56].
26.4.2.3 Hearing Loss Related toHaemophilus influenzae Type b
Meningitis
After developing and using the Hib conjugate vaccine, invasive Hib infections and Hib meningitis have become rare in countries implementing Hib vaccines in routine childhood vaccination schedules [57]. The invasive Hib disease can still be seen in
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infants below 1year of age whose Hib vaccine series has not been completed or administered, such as in several low-income countries [52]. Karppinen etal. [52] compared HL in ABM caused by Hib, S. pneumoniae, or N. meningitidis among children aged 2months to 13years in Angola. The HL caused by Hib meningitis was signicantly greater at >40dB.When children with any HL were divided into two groups, infants (n 117) and children 1year of age (n 103), a signicant differ­ence was found for S. pneumoniae and Hib versus other agents. In infants, HL at a threshold >60dB was caused more by pneumococcal meningitis, whereas Hib was the more common causative agent among older children [52].
A meta-analysis that included patients (n 2693) from low- and middle-income countries showed that the median risk for HL after meningitis was 11% for S. pneu- moniae and 5% for Hib and N. meningitidis [48].
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26.5 Use ofCorticosteroids inBacterial Meningitis
forPreventing Hearing Loss
According to the analysis by Brouwer etal. [58], steroids prevented any HL in 146 (14.6%) of 1001 corticosteroid-treated patients versus 196 (20.4%) of 960in the control group and severe HL in 57 (7.3%) of 772 corticosteroid-treated patients versus 86 (11.2%) of 752in the control group [58].
The mechanism of dexamethasone shows that it decreases proinammatory cytokine production such as tumor necrosis factor-alpha (TNF-α) and interleukin-1 (IL-1), increases the production of anti-inammatory cytokines, inhibits reactive oxygen species (ROS) production by leukocytes, and decreases leukocyte adher­ence. Furthermore, dexamethasone decreases intracranial pressure (ICP), brain edema, and CSF pleocytosis with pneumococcal cell wall-induced meningeal inammation [5964].
The use of dexamethasone in Hib meningitis has positive evidence for the pre­vention of post-meningitis HL and other neurological complications. Subgroup analysis yielded no difference in mortality for corticosteroid treatment between low- and high-income countries. For children in high-income countries, corticoste­roid treatment seems protective against severe HL and other short-term neurological sequelae [56].
26.6 Conclusion
Several bacterial infections in children can cause HL.Early recognition and treat­ment of these infections will stop the process leading to HL.In some selected cases, the appropriate class, dose, and duration of prompt antibiotic therapy for the agents causing meningitis and dexamethasone therapy will mostly prevent HL.
The surviving children from ABM should be evaluated for SNHL.If a hearing screening or follow-up reveals abnormal results, they may be consulted for early cochlear implantation before chronic cochlear ossication develops.
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