Come on PH, even you can't be enamored with this article. First of all, from the conclusion of the abstract:
"A percentage of patients presenting to the chiropractor have a mild to moderate hearing loss, most notably in the right ear."
"(M)ost notably the right ear", you saw it here first folks. If your left ear bothers you see a nautropath. For right ear problems, find a chiropractor.
But seriously, from the body of the study:
"As seen in the patient characteristics in Table 1, no patients had a chief complaint of hearing loss or impairment."
So while the authors go to great lengths to describe how they used a reliable tool to take audiometric screenings of all of their patients, these patients did not actually complain of hearing loss.
We go on to find out:
"Examination and palpatory findings were used to define areas of joint dysfunction and each patient received a high velocity, low amplitude thrust in the thoracic, lumbar spine and locomotor system including extremities. No 'specific' adjustment was given to solely restore hearing."
Wow. So merely being in the
presence of these great healers was enough. Gosh, now I see why you love chiropractic so much. Chiropractors cure everything that ails their patients, not just the stuff that the patients seek help for. You are right. As an allopathic physician I can tell you that I very rarely sucessfully treat conditions that neither my patient nor I know they have.
Moving on:
"Results - In the patient group with hearing impairment, the total number of tones heard on initial exam was fewer in the right ear (55 tones) than the left (83 tones). The normal patient group heard approximately 120 tones in each ear on the initial visit. After a single chiropractic intervention, the total tones heard increased to 104 on the right and 111 on the left (an increase of 49 and 28 respectively)".
Now, I had to read this several times and looked at the referenced figures repeatedly, because no where are any statistical analyses performed. Not only do the author "lump together" the findings from all their patients (instead of listing the number of patients who improved by "x" amount, as is convention) but they don't offer any analysis in terms of p-values, confidence intervals, or any other measure of chance. Now I am not going to run the numbers, I have neither the time nor the inclination, but I have to ask how the scientific community is supposed to accept chiropractic research if they are not even going to bother to analyze their data?
I'd love to just keep on slamming this paper, but the authors beat me to it:
"The current observational study cannot prove a cause and effect relationship. The limitations to this current study are the small sample size and that there was no blinding of the investigator though patients were blinded to the fact that hearing would be tested post-chiropractic care. Furthermore, no true control group or randomization of testing sequence was employed and potential alternative explanations as to the natural history of hearing loss may explain our results, for example some learning effect of the test."
So, by their own admission, the audiometric investigator was not blinded! Wow, yeah, that pretty much invalidates the entire thing right there. "Can you hear it now?" I mean come on, audiometry, performed bedside by a chiropractor intimately involved in the study, is not even worth gathering. And what stinks is that the paper could have been done well. Send the patients to an independant lab (or set one up in the office). Use a licenced audiometrist, or even better a speech pathologist or CIH. Send in some random controls to assess for "learning effect" and even run some folks through sham assessments or {GASP} allopathic care to serve as controls.
Of course actually starting with patients complaining of hearing loss would have been nice too!
😕
I guess once you get used to recruiting patients (despite a lack of complaints)during chiropractic school, you just can't get away from it...
- H