| 📋 Article Summary — Noise in Healthcare Settings | |
|---|---|
| Key Fact 1 | Dental surgeries can produce 90–100 dB(A) from high-speed handpieces — dentists are at significant risk of NIHL without protection |
| Key Fact 2 | Neonatal intensive care units (NICUs) can exceed 80 dB(A) — primarily from alarms, ventilators, and incubator noise, posing a risk to both patients and staff |
| Key Fact 3 | Conventional hearing protection is usually impractical in clinical settings — electronic HPD with communication capability or targeted engineering controls are required |
| Read Time | 8 min |
Unexpected Noise Hazards in Healthcare
Hospitals and healthcare facilities are not typically thought of as noisy workplaces. But specific areas and tasks within healthcare generate significant noise exposures for workers — dental handpieces, suction equipment, patient alarm systems, transport and mobilisation equipment, and the general ambient noise of busy wards and intensive care units.
High-Noise Areas in Australian Healthcare Facilities
- Dental surgeries: High-speed air-driven dental handpieces produce 90–100 dB(A) at the dentist’s ear position during cavity preparation. Dentists who work full-time with high-speed handpieces have documented rates of NIHL above the general population baseline. Dental assistants in the same room also receive significant exposures.
- Operating theatres: Powered surgical instruments (saws, drills, suction) combined with music (often played by surgeons) creates theatre ambient noise levels of 85–100 dB(A) during instrument-heavy procedures. Orthopaedic procedures with bone saws and power reamers are particularly loud.
- Emergency departments: Continuous alarms, medical equipment, voice escalation from distressed patients, and equipment trolleys create sustained ambient noise of 75–90 dB(A) in busy EDs.
- Intensive care units (ICU): Ventilator alarms, infusion pump alarms, cardiac monitors, and suction equipment combine to create ICU ambient noise of 70–85 dB(A) — below the 85 dB(A) standard for sustained hearing damage risk but well above levels that cause fatigue and alarm fatigue.
- Central sterilising departments: Steam autoclaves, ultrasonic cleaners, and washer-disinfectors create noise levels of 85–95 dB(A) in sterilising bays.
- Linen processing and laundry: Industrial washing machines, dryers, and presses produce 90–100 dB(A) sustained noise in hospital laundry facilities.
The Hearing Protection Challenge in Clinical Settings
Standard hearing protection creates a major problem in clinical settings: it impairs communication. Healthcare workers who cannot clearly hear patient voices, colleague communication, alarm tones, or auscultation cannot safely perform their clinical roles. This creates a fundamental tension between noise protection and clinical safety.
Solutions include:
- Electronic level-dependent earmuffs: Pass-through ambient sound at reduced levels while providing protection against loud impulse noise; maintain speech discrimination capability at near-normal levels. Suitable for dental work and surgical procedures with intermittent high-noise tasks.
- Custom-moulded earplugs with flat attenuation filters: Provide moderate noise attenuation without degrading speech intelligibility as severely as foam earplugs. Used by musicians — applicable to clinical settings where communication is critical.
- Engineering controls as primary strategy: Enclosing sterilising equipment, installing acoustic baffles in linen departments, and alarm management programs to reduce unnecessary alarm frequency are more appropriate than HPD for clinical environments.
Alarm Fatigue and Noise in Healthcare
Hospital alarm noise creates a dual problem: it is loud enough to damage hearing with sustained exposure, and it is so frequent and repetitive that staff become desensitised to alarm signals — a phenomenon known as alarm fatigue. Alarm fatigue is a recognised patient safety issue and is associated with delayed or missed response to critical clinical alarms. Reducing unnecessary alarm activations (through better alarm threshold setting, alarm tiering, and technical interventions) reduces both noise exposure and patient safety risk simultaneously.
Frequently Asked Questions
Should dentists be included in hearing conservation programs?
Yes — if dentists operate high-speed handpieces for more than a brief portion of their working day, they may accumulate noise doses at or above the 85 dB(A) action level. Hearing conservation for dental practices includes: noise assessment (particularly at the dentist’s ear position during high-speed drilling), offering audiometric testing, and considering electronic HPD options that do not impair communication with patients. The dental practice as employer has the same WHS obligations regarding noise as any other PCBU.