2.1 Case History Intake & Medical Pre-Screening

Case History Intake & Medical Pre-Screening

Introduction

The foundation of effective patient assessment begins with a thorough case history intake and medical pre-screening. This process goes beyond merely collecting biographical data; it serves as a critical diagnostic tool that guides the entire audiometric evaluation and subsequent treatment plan. As a hearing healthcare professional, your ability to conduct a comprehensive interview sets the tone for the patient-provider relationship and uncovers vital clues about the etiology and nature of the patient's hearing loss.

Patient Demographics and Chief Complaint

Gathering patient demographics is the first step. This includes the patient's age, occupation, lifestyle, and general contact information. The patient's occupation can provide insights into potential occupational noise exposure or specific listening needs.

The chief complaint is the primary reason the patient is seeking your services. It should always be recorded in the patient's own words. Understanding the chief complaint helps prioritize the evaluation. Is the patient struggling to hear in background noise? Are they experiencing tinnitus? Or has a family member insisted they get tested? Addressing the chief complaint is the ultimate goal of your intervention.

Onset and Progression of Hearing Loss

Determining the onset (when the hearing loss started) and progression (how it has changed over time) is crucial.

• Sudden onset: A hearing loss that develops instantaneously or over a few days is a medical red flag requiring immediate physician referral. It could indicate sudden sensorineural hearing loss, viral infection, or vascular issues.
• Gradual onset: A slow, progressive loss is typical of presbycusis (age-related hearing loss) or noise-induced hearing loss.
• Fluctuating hearing loss: Hearing that varies from day to day may suggest conditions like Ménière's disease or middle ear pathology.

Ototoxic Medications

A thorough review of the patient's medical history must include questions about the use of ototoxic medications—drugs known to cause damage to the inner ear (cochlea or vestibular system). Key categories of ototoxic drugs include:

1. Aminoglycosides: A class of powerful antibiotics (e.g., gentamicin, streptomycin, tobramycin, kanamycin) often used to treat severe bacterial infections. They can cause profound, irreversible sensorineural hearing loss.
2. Loop Diuretics: Medications like furosemide (Lasix), bumetanide, or ethacrynic acid, frequently used to treat congestive heart failure and edema. Their ototoxic effects are often dose-dependent and sometimes reversible.
3. Platinum Chemotherapy Agents: Drugs like cisplatin and carboplatin, used in cancer treatment, are highly ototoxic and cause irreversible damage, typically starting in the high frequencies.
4. High-Dose Aspirin (Salicylates): Prolonged use of high doses of aspirin can cause temporary hearing loss and tinnitus, which usually resolves when the medication is discontinued.

Tinnitus Characteristics

Tinnitus, or ringing in the ears, is a common symptom accompanying hearing loss. When assessing tinnitus, ask about its:

• Type: Is it ringing, buzzing, roaring, or clicking? Pulsatile tinnitus (matching the heartbeat) is a red flag for vascular issues.
• Duration: Is it constant or intermittent?
• Laterality: Is it in one ear (unilateral) or both ears (bilateral)? Unilateral tinnitus is a significant red flag requiring medical referral.
• Impact: How much does it affect the patient's sleep, concentration, and quality of life?

Noise Exposure History

Investigating the patient's noise exposure history is essential for determining potential noise-induced hearing loss (NIHL). Inquire about:

• Occupational noise: Factory work, construction, military service, aviation.
• Recreational noise: Firearms, motorsports, loud music, power tools.
• Use of Hearing Protection: Ask if the patient consistently used appropriate hearing protection (HPDs) during these exposures.

NIHL typically presents as a bilateral, high-frequency sensorineural hearing loss, often with a characteristic "notch" around 3000 to 6000 Hz on the audiogram.

Family History

A significant portion of hearing loss has a genetic component. Ask about the family history of hearing loss, specifically inquiring if any immediate family members (parents, siblings) experienced hearing loss before age 50. This can help differentiate hereditary hearing loss from presbycusis or noise exposure.

Previous Hearing Aid Experience

If the patient is an experienced user, documenting their previous hearing aid experience is vital. Ask about:

• Make, model, and age of current devices.
• What they like and dislike about their current aids.
• Daily usage time and specific situations where the aids perform well or poorly. This information provides a baseline for setting realistic expectations and selecting appropriate new technology.

Medical Pre-Screening

The medical pre-screening ensures that the patient does not have underlying conditions that contraindicate audiometric testing or require physician intervention. In addition to the FDA red flags (covered in the next section), screen for:

• History of ear surgery.
• Current head colds, sinus infections, or allergies.
• Dizziness, vertigo, or balance issues.
• Facial numbness or paralysis.

Summary of Case History Flow

1. Welcome and establish rapport.
2. Identify chief complaint.
3. Investigate hearing loss history (onset, progression).
4. Review medical history (ototoxic drugs, surgeries).
5. Discuss tinnitus, dizziness, and noise exposure.
6. Evaluate family history and previous amplification.

By systematically gathering this information, you formulate a preliminary hypothesis about the patient's hearing status, ensuring a safer and more targeted evaluation process. This comprehensive approach is central to best practices in hearing healthcare.