Clase # 2 - Enfermedades del Oído Externo

Name: Clase # 2 - Enfermedades del Oído Externo
Uploaded: 2024-04-26T00:00:00.000Z
Duration: 2 h 10 min 20 s

Understanding External Ear Disorders

Overview of Ear Anatomy

The ear is divided into three parts: external ear, middle ear, and inner ear. The discussion begins with a focus on disorders of the external ear.

Congenital Anomalies of the External Ear

Congenital anomalies can be classified based on characteristics such as position, size, and shape of the auricle.

Other classifications include the presence of preauricular cysts and fistulas, malformations from the first branchial arch, and conditions like hypoplasia of tympanic bone.

Embryological Considerations

Information about these anomalies relates to embryology; specifically how the ear forms during development.

Microtia is highlighted as a significant condition within this group, which includes various malformations affecting both structure and facial features.

Genetic Factors in Auricular Development

Some hereditary disorders are transmitted through Mendelian dominant traits affecting helix formation between weeks 2 to 16 of embryonic development.

Clinical Implications for Medical Students

Medical students must learn to identify these conditions since they often require referral to plastic surgery if patients express concern over appearance.

Branchial Arch Malformations

Understanding Branchial Arches

The branchial apparatus consists of five pairs of mesodermal arches separated by ectodermic invaginations that lead to structures like clefts and pouches.

Formation of Cysts and Fistulas

Defects in differentiation during weeks 3 to 7 can result in branchial cysts or fistulas originating from any of the first three arches.

Clinical Presentation and Management

Identifying Preauricular Fistulas

Preauricular fistulas may present as reddish openings near the helix; they can be unilateral or bilateral. Parents often seek medical advice due to pus-like discharge.

Examination Protocol for Newborns

Pediatricians perform mandatory examinations for newborn ears to detect malformations. This includes checking for patency using a nasogastric tube.

Treatment Considerations

Understanding Surgical Criteria for Fistulous Tracts

Surgical Indications for Abscesses

Not all patients with fistulous tracts require surgical excision; only those with documented abscesses by an otorhinolaryngologist or general physician are considered for surgery.

Patients who have lived into adulthood without infection may not need intervention, as their mortality risk is likely due to other causes.

Embryological Considerations in Anomalies

Understanding the embryology of the first and second branchial arches is crucial, as they give rise to various auditory structures.

There is ongoing debate in literature regarding whether certain parts of the stapes originate from the otic capsule, highlighting discrepancies in anatomical studies.

Congenital Malformations and Hearing Loss

Congenital anomalies can present individually or collectively, often going unnoticed until adulthood unless they cause hearing issues.

Conductive hearing loss occurs when sound transmission from the external ear to the inner ear is disrupted, which can be identified through audiometric testing.

Diagnostic Approaches and Findings

Otolaryngologists may perform exploratory tympanotomy if initial assessments indicate malformations in the ossicular chain.

Imaging techniques like tomography can help document structural abnormalities in cases where hearing loss is suspected.

Identifying Auditory Malformations Across Age Groups

Age-related Presentation of Hearing Issues

Patients with varying degrees of conductive hearing loss may present at any age; early detection often depends on parental observation of language development delays.

Some adults might discover minor malformations incidentally during routine checks, such as obtaining a driver's license.

Specific Branchial Arch Malformations

First branchial arch malformations can occur without affecting ossicles but may involve tympanic bone and persistent meatal plugs.

Incomplete reabsorption of embryonic tissue can lead to closed external auditory canals that end in blind pouches.

Surgical Interventions and Treatment Options

Treatment Strategies for Auditory Malformations

Most patients with narrow external auditory canals still possess an intact ossicular chain; surgical intervention may be necessary depending on individual cases.

The absence of a permeable external canal does not preclude finding functional components within the middle ear that could benefit from surgical correction.

Use of Assistive Devices

For patients unable to undergo traditional surgeries, devices that transmit sound vibrations directly to the inner ear can enhance auditory function without requiring cochlear implants.

Microtia and Associated Conditions

Microtia presents as small auricles and may accompany more severe conditions like agenesis of the external auditory canal or tympanic membrane deformities.

Pathologies of the External Ear

Common Issues with Earwax

The discussion begins with an overview of acquired pathologies of the external ear, emphasizing that lack of earwax (cerumen) is not a pathology but a common reason for referrals to otolaryngologists.

Earwax serves as a natural lubricant and contains substances that inhibit germ proliferation; its absence can lead to discomfort such as itching.

Factors like hereditary traits or low-fat diets can result in reduced earwax production, leading patients to frequently clean their ears, which exacerbates the issue.

Misconceptions About Ear Cleaning

Patients often misinterpret symptoms like itching as indicative of fungal infections when there are no visible signs of infection or inflammation.

Over-cleaning is particularly common among elderly patients due to atrophy in ceruminous glands and hormonal changes in women during menopause.

Treatment Recommendations

The speaker suggests that treatment for absent earwax should focus on reducing excessive cleaning rather than aggressive interventions.

The anatomy of the external auditory canal naturally facilitates self-cleaning, and minimal external cleaning is recommended.

Cultural Perceptions and Practices

There exists a stigma around earwax cleanliness; people often associate it with poor hygiene despite its biological necessity.

The speaker advocates for understanding that having some earwax is healthy and provides tips for safe cleaning practices without inserting objects into the ear canal.

Cleaning Techniques and Cautions

While hydrogen peroxide is sometimes recommended by other practitioners, the speaker shares negative experiences with it causing irritation in some patients.

Instead, mineral oil is suggested as a safer alternative for softening wax before professional cleaning procedures.

Managing Wax Blockage

Most patients with wax buildup are asymptomatic until they experience significant blockage affecting hearing or causing discomfort.

For symptomatic cases, mineral oil drops are prescribed to hydrate wax before scheduled removal procedures.

Professional Practice Insights

The speaker emphasizes caution when performing ear cleanings; proper instruments should be used, especially by general practitioners who may not have specialized training.

Ear Cleaning and Medical Equipment

Importance of Proper Tools in Ear Care

The speaker emphasizes the necessity of having the right instruments for ear cleaning, particularly an otoscope, to ensure proper medical practice.

It is highlighted that general practitioners should have access to an otoscope; if not provided by the institution, they should procure one themselves for both institutional and private practice.

The discussion touches on the "law of least effort," indicating that some practitioners may avoid using necessary equipment due to convenience or lack of availability.

Referral Practices and Documentation

The speaker clarifies that referrals to specialists (e.g., ENT doctors) should be accompanied by a well-documented clinical history rather than vague notes like "referral for evaluation."

A proper referral document must include patient details such as symptoms onset, treatments received, findings from physical exams, and presumptive diagnoses.

Common Ear Conditions and Treatments

The speaker discusses common conditions causing itching in the ears, including epidermal pathologies and how they can lead to discomfort.

Desquamation in the external auditory canal is described as resembling dandruff; this condition can cause significant itching and requires careful examination.

Managing Earwax Buildup

Treatment options for cerumen impaction are discussed, including mineral oil or corticosteroids. It's noted that earwax can mix with shed epithelial cells.

The speaker explains how certain types of earwax plugs may appear similar to foreign bodies but are often just impacted skin debris.

Patient Education on Ear Hygiene

Emphasis is placed on educating patients about safe ear cleaning habits; improper techniques can lead to injury or infection.

Understanding Cholesteatoma and Its Implications

Overview of Cholesteatoma

Cholesteatoma is described as a pathological condition affecting the external auditory canal, characterized by a pearly white lesion.

It is defined as a collection of epithelial tissue that forms behind the tympanic membrane when it ruptures; it is benign but can lead to complications.

Cholesteatomas can occur in both the external auditory canal and the middle ear, with concerns about their space occupation.

Pathophysiology and Symptoms

The condition may arise from defective squamous epithelial migration in the tympanic membrane and external auditory canal.

Patients often present with discharge from the ear, which may include pus and foul-smelling epithelial fragments, leading to conductive hearing loss.

In severe cases, cholesteatomas can erode nearby bone structures, including parts of the ossicular chain.

Diagnosis and Treatment Approaches

When discussing cholesteatomas of the external auditory canal, it's noted that the tympanic membrane usually remains intact.

Treatment typically involves cleaning procedures using mineral oil and hydrogen peroxide; surgical intervention may be necessary for severe cases involving bone erosion.

Corticosteroid drops may be prescribed if there’s significant erosion preventing removal; surgery might involve grafting skin over defects.

Controversies in Classification

There is debate among authors regarding whether cholesteatoma should be classified alongside keratitis or as a separate entity.

Some literature refers to them interchangeably while others maintain distinct classifications; this discrepancy will not be tested in examinations.

Long-term Management Considerations

Patients with cholesteatomas require ongoing management due to potential recurrence; regular cleaning and aspiration are essential for maintaining ear health.

Conditions like exudative otitis externa can mimic symptoms of cholesteatoma but differ in etiology; thorough clinical history is crucial for accurate diagnosis.

Understanding Otitis Externa and Its Treatment

Overview of Otitis Externa

The discussion begins with the presentation of otitis externa, often linked to skin issues in the ear canal, commonly caused by Pseudomonas aeruginosa.

Other bacteria such as Proteus vulgaris and Staphylococcus aureus can also be involved; scratching can exacerbate the condition by creating openings for infection.

Symptoms and Diagnosis

Patients may experience significant pain upon physical examination, particularly when pressure is applied to the tragus. The external ear canal may appear swollen and red.

In most cases, treatment involves topical antibiotic drops rather than systemic therapy; common medications include Neomycin-polymyxin with hydrocortisone or ciprofloxacin.

Types of Otitis Externa

Distinction is made between diffuse otitis externa and localized forms like furunculosis, which presents as a painful red bump resembling acne due to infected hair follicles.

Furunculosis is primarily caused by Staphylococcus aureus; patients may notice drainage from these lesions.

Complications and Further Management

If symptoms persist after 7 days of treatment with topical antibiotics, referral to an otolaryngologist (otorhinolaryngologist) is recommended for further evaluation.

Fungal infections (otomicosis), characterized by black spots in the ear canal, are also discussed. Aspergillus species are common culprits.

Treatment Approaches for Fungal Infections

For fungal infections, initial management may include antifungal drops; however, cleaning of the ear canal by a specialist is crucial for effective treatment.

Fluconazole may be prescribed if necessary but should not be the first-line option. Referral to an otorhinolaryngologist is advised for persistent cases.

Special Considerations

Discussion on Otitis Externa and Related Complications

Diagnosis and Referral Process

The speaker discusses the challenges in diagnosing otitis externa, particularly when other risk factors or comorbidities are present. They mention referring a patient to an otolaryngologist due to unresolved symptoms after two cycles of oral antibiotics.

A virtual health record system did not allow for proper documentation of the diagnosis as "otitis," leading to a referral categorized differently. The patient was hospitalized after evaluation at Santo Tomás.

Importance of Clinical Evaluation

The speaker emphasizes the significance of clinical evaluation over imaging, stating that they could diagnose otitis externa without needing a CT scan, which was later confirmed by imaging.

Continuous monitoring is crucial; the speaker tracks patients' progress through their health records, noting improvements in swelling and complications like granulomas associated with otitis externa.

Complications and Risks

The discussion highlights that certain types of otitis externa can lead to severe complications, including potential mortality risks. While rare, these cases require careful management due to possible serious outcomes like cerebral thrombosis.

Allergic reactions related to external ear conditions are noted. The speaker mentions how some patients may react adversely to treatments or materials used in piercings, leading to further complications such as perichondritis.

Common Foreign Bodies in Ears

Common foreign bodies found in ears include cotton and small objects like beans or lentils. The importance of recognizing normal ear anatomy is stressed for effective diagnosis.

There’s a cautionary note about improper piercing practices leading to infections or allergic reactions, emphasizing the need for qualified professionals during such procedures.

Treatment Approaches

For perichondritis resulting from piercings or trauma, treatment may involve systemic antibiotics and possibly surgical intervention if abscesses develop.

Patients should be educated on avoiding self-treatment methods that could exacerbate conditions like tympanic membrane perforations caused by improper cleaning techniques.

Conclusion on Ear Health Management

Emphasizing preventive care is vital; awareness about common issues faced by children regarding foreign bodies in ears can help mitigate risks early on.

Understanding Ear Trauma and Related Conditions

Types of Ear Trauma

The appearance of "cauliflower ear" is discussed, particularly in severe cases where necrosis occurs, necessitating surgical intervention.

Boxers are highlighted as common victims of ear trauma due to repeated impacts, leading to separation between skin and perichondrium, resulting in hematomas that appear swollen and red.

Complications from Ear Injuries

Various traumas can affect the external auditory canal, including abrasions or burns. These injuries can lead to complications such as stenosis (narrowing) of the canal.

Treatment for auricular hematomas often involves drainage using a syringe and applying compressive bandaging to prevent further complications.

Referral Protocols for Ear Conditions

When referring patients with perichondritis or hematomas, it’s crucial to direct them appropriately—either to an otolaryngologist or emergency services depending on severity.

Cauliflower Ear: Causes and Consequences

Perichondritis leads to inflammation and vascular damage in cartilage; repeated trauma from boxing frequently results in cauliflower ear due to persistent hematomas.

Unlike one-time injuries like those from piercings, boxers endure continuous trauma which exacerbates their condition.

Tumors Associated with the External Auditory Canal

Benign tumors such as exostoses (bony growths), osteomas, adenomas, and hemangiomas are noted. Malignant tumors include squamous cell carcinoma and basal cell carcinoma linked primarily to sun exposure.

Characteristics of Tumors

Exostoses typically occur in swimmers exposed to cold water over time; they may not block the entire canal but can lead to infections if obstructed.

Osteomas are often unilateral and require imaging (CT scans) for diagnosis; they differ from exostoses based on location.

Diagnosis and Management Strategies

A presumptive diagnosis for tumors in the auditory canal should be made cautiously until confirmed by imaging studies.

Adenomas arise from cerumen-producing glands while hemangiomas present as vascular masses; these conditions usually require excision but rarely progress to cancer.

Malignant Tumors Overview

Squamous cell carcinoma is identified as the most common malignant tumor affecting the external auditory canal. Basal cell carcinomas are also prevalent due to UV exposure history.

Distinguishing Otitis Externa from Tumors

Key Differences and Symptoms

The discussion highlights the distinction between otitis externa and tumors, emphasizing that otitis externa is characterized by inflammation rather than neoplastic growth.

Malignant otitis externa may present with edema, particularly noticeable in the ear canal, which can be a critical diagnostic indicator.

Symptoms include significant pain, discharge, and impaired hearing; these are common complaints among affected patients.

A specific case is mentioned involving an immunocompromised elderly patient with diabetes who exhibits severe symptoms indicative of advanced infection or inflammation.