The importance of our balance system is often neglected. Many people do not realize that the most common cause of falls especially in the older population is due to a problem in their inner ear which houses our balance system known as the vestibular system. Many of our patients are referred to us by their ear nose and throat specialist for a hearing test when their symptoms involve dizziness and imbalance and they ask me, “ why a hearing test if I am dizzy”??
This article that we would like to share defines some key points regarding the relationship between hearing and balance and what researchers are doing to explore the connection.
What people can hear — and do not hear — has a direct effect on their balance, according to a new study.
This research provides a better understanding of the relationship between hearing loss and why people fall, especially in the elderly population, according to researchers at the New York Eye and Ear Infirmary of the Mount Sinai Health System.
The findings could lead doctors to screen for hearing loss in patients at high risk for falls, detect hearing loss in its early stages, and treat it quickly, they said, noting falls are the leading cause of deadly injuries in the United States.
“Prior studies have shown that hearing loss is an independent risk factor for falls, even for those who were not dizzy,” said senior author Maura Cosetti, M.D., an associate professor of otolaryngology at the Icahn School of Medicine at Mount Sinai, and director of the Ear Institute at NYEE.
“However, the reason why has never been completely understood, although it is believed to be related to the inner ear. This study found that the sounds we hear affect our balance by giving us important information about the environment. We use sound information to keep ourselves balanced, especially in cases where other senses, such as vision or proprioception, are compromised.”
“Balance is complicated and involves the coordination of many different sensory inputs,” she said. “When people fall, doctors typically focus on vision issues, check for neuropathy in their feet, and bone issues, and fully ignore issues related to hearing.
“This review highlights the importance of hearing for our sense of balance. And because hearing loss is treatable, getting hearing checked is a crucial first step.”
For the study, a team of researchers from Mount Sinai and New York University’s Steinhardt School of Culture conducted a comprehensive analysis of all published research that investigated the association between sound and standing balance.
They looked at 28 medical articles involving more than 700 patients. Many of the studies focused on fields that clinicians who treat falls would not typically encounter, such as sound engineering, computer science, physics and psychology. The researchers noted they combined all of the studies and looked for trends in the data.
The studies analyzed mostly healthy adults, but also looked at patients with congenital blindness, vestibular loss (damage to the inner ear causing balance and eye issues, including vertigo), and different levels of hearing loss, the researchers reported.
All research examined how sounds affected someone’s ability to keep their balance while standing still, often with their eyes closed and when standing on a pliable, squishy surface. The research also looked at how wearing noise-canceling headphones — creating a complete lack of sound — affected balance. Some studies played white noise or static, while others used environmental sounds, such as cocktail party chatter or running water.
Researchers found that people had more difficulty staying balanced or standing still on an uneven surface when it was quiet, but had better balance while listening to sounds.
The researchers also discovered that the type of sound was important when it comes to balance.
Specifically, continuous background noise (usually static) was the most helpful for subjects to keep their center of gravity.
Some types of sounds actually caused poor balance. For example, some people who listened to sound jumping back and forth through headphones (i.e. beeping that went from left to right) had difficulty standing upright.
The researchers believe this may be because sound can act as an “auditory anchor.”
People use sounds like white noise to unconsciously create a mental image of the environment to keep ourselves grounded, they explained.
The research analysis also showed that sound became more important for balance when the subjects were given difficult balancing tasks, such as standing on a moving floor, or if the patients had pre-existing sensory issues.
When people with vision loss, hearing loss, or balance problems heard stationary sounds, their posture dramatically improved. This suggests people rely more on hearing when other senses are impaired, the researchers postulate.
“This research suggests that sounds can have a stabilizing effect on balance — maybe acting as an anchor that patients can lean on when other senses are less reliable — and shows that being unable to hear sounds resulted in poorer balance. Ultimately an inability to hear puts patients at higher risk for instability and falls,” Cosetti said.
“Elderly patients have a number of factors that put them at greater risk of falling, and hearing loss is a significant and under-recognized contributor. Age-related hearing loss is prevalent, affecting up to two-thirds of those over the age of 70, and should be considered and checked in those at high risk for falls.”
“Future research will confirm whether treating that hearing loss with hearing aids or other implants will also serve as a type of ‘balance aid’ like a cane, giving access to important information that could be used to improve balance and decrease fall risk,” she added.
The analysis also highlighted large gaps in research on hearing loss and balance, according to the researchers. Future studies are needed that look at different levels of hearing loss, and how hearing aids and cochlear implants affect balance.
The researchers added that more studies using everyday sounds like traffic or shopping malls or airports are necessary to understand more about fall risks in people with hearing loss. Also, more studies focused on older adults need to be conducted, they concluded.
The study was published in JAMA Otolaryngology-Head & Neck Surgery.
Source: Mount Sinai Hospital