A photo of the Aqua Stim.
Micromedical by Interacoustics

Aqua Stim: Caloric irrigator

Caloric testing using water

The Aqua Stim caloric irrigator is used for stimulating the horizontal semicircular canal in the inner ear. This is done by delivering warm water or cold water into the external ear canal. This standard clinical test is used to determine if the inner ear is working properly in patients with dizziness or balance disorders.
Alternatively use Air Fx with Air.

Thorough assessment of vestibular function

Aqua Stim delivers warm water or cold water into your patient's left ear or right ear. The temperature is automatically controlled by the Interacoustics videonystagmography (VNG) software if used along with Aqua Stim. Typically, you would perform bithermal irrigations. This consists of one warm water irrigation and one cold water irrigation on the left ear and on the right ear. Vestibular stimulation in this manner enables you to assess your patient's peripheral vestibular system.

Quantify your patient's caloric nystagmus

By delivering warm or cold water into your patient's ear canal, the temperature changes cause a convection current in the ear being stimulated. Depending on the temperature of the water, this either excites or inhibits the cupula. This initiates the vestibular-ocular reflex (VOR), which causes caloric nystagmus. If you integrate Aqua Stim with Interacoustics' videonystagmography (VNG) software, this nystagmus is quantified during the caloric test.

An easy addition to your vestibular test battery

Aqua Stim can be used together with Interacoustics' videonystagmography (VNG) software via a USB interface. Aqua Stim comes with an independent water tank, which means you can perform your caloric testing without a drain and faucet being present.

Why perform caloric testing?

Caloric testing, or caloric stimulation, be it with air or water, is a good means of stimulating the vestibular end organs. It also does this independently, meaning you can identify how the end organs compare and if the weakness is unilateral or bilateral.

Analyzing the caloric test results

Typically, warm water irrigation will result in nystagmus that beats toward the test ear. On the contrary, cold water irrigation will produce nystagmus that beats away from the test ear. Directional preponderance, or unilateral weakness, are manifested by asymmetrical caloric responses. Asymmetrical caloric responses are reflected by an unequal amount of left-beating nystagmus when compared with right-beating nystagmus. Weak caloric responses from both ears is indicative of a bilateral weakness.

Get a quote

Enter your details, and we'll be in touch with a no-obligation quote

By submitting my contact information I accept to get a phone call or email from Interacoustics or the local special instrument dealer in my area for further information and offers

Click here to read our privacy policy, if you want to know more about how we treat and protect your personal data.

Search guides

Need technical help? Download and run TeamViewer for live assistance.


The latest advancements in diagnostic audiology and balance presented by our internationally respected experts.

Shop online

Browse the webshop’s audiological supplies and stock up on products from the best brands of the industry.
Want to know more about our products or arrange a demonstration? Contact an Interacoustics sales office, call +45-6371-3555, or find a distributor.
Features and/or functions may not be available for all countries or all areas and product specifications are subject to change without prior notification.
Copyright © 2020 Interacoustics A/S. All rights reserved. Privacy policy