C-section babies may be more likely to fail first hearing test
Experts concur parents should not be alarmed by finding, as problem is typically temporary.
(HealthDay) -- Infants delivered by Cesarean section are three times more likely than babies delivered vaginally to fail their first hearing test, which is performed shortly after birth, new research from Israel finds.
However, the researchers noted that parents should be aware of this difference, but not alarmed, because this hearing "problem" is typically temporary.
Dr. Tatiana Smolkin, a neonatal researcher at Rambam Medical Center in Haifa, Israel, who worked on the study, said the loss generally disappears after 72 hours.
"Fluids are retained in the middle ear," which seems to affect neonatal hearing, she explained.
U.S. experts agreed that parents should take the information in stride.
"I think the take-home message is if you have had a C-section be prepared there is a higher chance your baby is going to fail one of these hearing tests, whether or not they have a hearing loss," said Dr. Richard Rosenfeld, chair of otolaryngology at SUNY Downstate, in Brooklyn, N.Y. He co-chaired the committee that crafted the American Academy of Pediatrics' guidelines on the management of the middle ear problem known as otitis media with effusion.
Dr. Dennis Woo, a pediatrician at the University of California, Los Angeles, Medical Center in Santa Monica, said the problem is often transient, and if the testing were done three or four days after birth, the results would likely be very different.
"There is nothing worrisome here as far as for the parents," Woo said.
To be sure, parents need to follow up with the baby's pediatrician, the doctors agreed.
For the study, the Israeli researchers evaluated 1,653 newborns. Of these, 1,170 were delivered vaginally; the other 483 by C-section.
They looked at the babies' results on their first hearing test, known as the otoacoustic emissions test.
Otoacoustic emissions are sounds given off by the inner ear when the inner ear structure known as the cochlea is stimulated by a sound. When the sound occurs, the outer hair cells of the ear vibrate. This produces an almost inaudible sound that throws an echo back into the middle ear.
The person conducting the test inserts a small probe into the ear canal to measure the sound; those with certain levels of hearing loss do not produce these very soft sounds.
The test can also detect the presence of middle ear fluid, which can temporarily affect hearing.
In the study, nearly 21 percent of the C-section babies failed the test, while only a little more than 7 percent of those delivered vaginally did. The test was done before the babies were 48 hours old.
The risk of failing the test, overall, was also higher in those babies who had it before they were a day old.
In the United States, about one-third of births are Cesarean.
The study, published online June 11, appears in the July print issue of the journal Pediatrics.
As the babies got repeat tests, most had normal results. The researchers had to refer 10 who did not -- five delivered vaginally, and five C-section babies -- for a different test that evaluates auditory brainstem functioning. All of these infants passed this test.
The researchers suggested that the first hearing test after C-section should preferably be delayed until the baby is beyond 48 hours old.
C-section babies may be "a little different," Woo agreed.
Something about the vaginal birth process may help dissipate the middle ear fluid, said Rosenfeld, who wrote the book "A Parent's Guide to Ear Tubes," about the procedure done when middle ear fluid persists.
Parents might consider asking their pediatrician to delay the test beyond the first two days after birth. "It makes sense," Woo said.
More information: To learn more about infants' hearing, visit the American Speech-Language-Hearing Association.
Journal reference: Pediatrics
Copyright © 2012 HealthDay. All rights reserved.
- Antibiotics do not appear helpful in preventing fluid buildup in children with ear infections Feb 18, 2008 | not rated yet | 0
- Know the types of hearing loss to find the right treatment May 13, 2011 | not rated yet | 0
- Specialization for underwater hearing by the tympanic middle ear of the turtle Mar 21, 2012 | not rated yet | 0
- Fireworks can cause hearing loss in children Jun 29, 2010 | not rated yet | 0
- Hearing theory music to MP3 generation ears Dec 01, 2011 | not rated yet | 0
- Motion perception revisited: High Phi effect challenges established motion perception assumptions Apr 23, 2013 | 3 / 5 (2) | 2
- Anything you can do I can do better: Neuromolecular foundations of the superiority illusion (Update) Apr 02, 2013 | 4.5 / 5 (11) | 5
- The visual system as economist: Neural resource allocation in visual adaptation Mar 30, 2013 | 5 / 5 (2) | 9
- Separate lives: Neuronal and organismal lifespans decoupled Mar 27, 2013 | 4.9 / 5 (8) | 0
- Sizing things up: The evolutionary neurobiology of scale invariance Feb 28, 2013 | 4.8 / 5 (10) | 14
Dipole term in multipole expansion
2 hours ago Hi. I'm having some difficult in understanding something about the dipole term in a multipole expansion. Griffiths writes the expansion as a sum of...
Bubbles in a Pre-Boiling/Boiling pot of water
3 hours ago How is it that bubbles form on the bottom of a surface of a pot of boiling water? I think that there is probably an elementary answer to this...
Assumptions of Griffith's fracture theory
14 hours ago Any experts on Griffith's fracture theory? I am studying the subject and I am having hard time finding out if the theory is valid for all possible...
Current leading voltage or vice versa concept
15 hours ago Hello, I was wondering if there is a conceptual explanation for when current leads voltage or vice versa for capacitors or inductors with AC...
Angular Frequency of AC voltage
19 hours ago Hello, I am wondering, what is the physical interpretation of the angular frequency of AC voltage? I don't see the physicality of what the angle...
Modeling Rigid Body - Unsure about Euler angles and angular velocity
19 hours ago I'm modeling a single 3D rigid body in preparation for some more complicated modeling in order to gain a better understanding of Euler angles, the...
- More from Physics Forums - Classical Physics
More news stories
A study by Alexandra L. C. Martiniuk, M.Sc, Ph.D., of The George Institute for Global Health, Sydney, Australia, and colleagues suggests less sleep per night is associated with a significant increase in the risk for motor ...
Pediatrics May 20, 2013 | not rated yet | 0
Whole-cell pertussis vaccines were more effective at protecting against pertussis than acellular pertussis vaccines during a large recent outbreak, according to a new Kaiser Permanente study published in Pediatrics.
Pediatrics May 20, 2013 | not rated yet | 0 |
Levels of physical inactivity and obesity are very high in children, with fewer than 50% of primary school-aged boys and fewer than 28% of girls meeting the minimum levels of physical activity required to maintain health. ...
Pediatrics May 17, 2013 | 5 / 5 (1) | 0
Poisonings in young children have increased over the past decade, mainly due to medications in the home. A new study led by the Central Ohio Poison Center at Nationwide Children's Hospital, found that medication-related poisonings ...
Pediatrics May 16, 2013 | not rated yet | 0
A drug commonly used to treat depression and anxiety may improve a stress-related heart condition in people with stable coronary heart disease, according to researchers at Duke Medicine.
47 minutes ago | not rated yet | 0 |
(HealthDay)—The overall health of Americans isn't improving much, with about six in 10 people either overweight or obese and large numbers engaging in unhealthy behaviors like smoking, heavy drinking or ...
57 minutes ago | not rated yet | 0
(HealthDay)—In 2008 to 2010, the prevalence of key health behaviors among U.S. adults varied, with about one in five adults current smokers and 62.1 percent overweight or obese, according to a report presented ...
47 minutes ago | not rated yet | 0
(HealthDay)—Factors such as increased case finding may explain why Michigan had half of the total spinal infections associated with contaminated methylprednisolone acetate in the recent fungal meningitis ...
37 minutes ago | not rated yet | 0
Early use of tracheostomy for mechanically ventilated patients not associated with improved survival
For critically ill patients receiving mechanical ventilation, early tracheostomy (within the first 4 days after admission) was not associated with an improvement in the risk of death within 30 days compared to patients who ...
46 minutes ago | not rated yet | 0
(HealthDay)—Three-quarters of public schools in the metro Atlanta area contain microbes, including bacteria indicating the presence of fecal matter, according to research published in the May 17 issue of ...
27 minutes ago | not rated yet | 0