Anatomy
Has hair cells imbedded in it that sense head motion
Cupula
Which specific motion does the anterior SCC sense
Vertical rotational acceleration (nodding head yes)
2 reasons which are likely why anterior SCC BPPV is rare
1) Anterior SCC sits at the highest vertical position making it difficult for the crystals to get in due to gravity
2) Gravity helps clear debris out of the anterior canal once it is in
List any 2 characteristics of the participants/sampling
30 patients
criteria for diagnosis
18 participants at both ASC and PSC BPPV
6 male, 24 female
most in their 50s
2 pts with DM, 4 with hypertension, 12 with high-frequency hearing loss
regular screening
average latency of nystagmus: 7.6 s
mean duration of nystagmus: 17.1s
List any 2 limitations of the study
•Small sample size
•No control group
•24/30 of participants were women (Difficult to generalize findings)
•Narrow outcome measures (doesn’t include: quality of life, functional limitations, fall risk)
Calcium carbonate crystals which sit in the otolith organs
Otoconia
How to diagnose anterior SCC BPPV (simply)
downbeating nystagmus
What did they do with patients who had both PCC and ACC BPPV?
For participants with both PCC and ACC they first did a maneuver for PSC followed by the canalith repositioning maneuver for ASC
Other than direction of the motion what other aspect of the movement does the vestibulocochlear nerve send signals about?
speed of the movement
2 examples of otolith organs
utricle and saccule
What 2 reasons does sensing angular acceleration help with?
Maintaining balance
Maintaining stable vision
Anterior SCC BPPV accounts for __% of BPPV cases
3%
By the end of the study how many out of the 30 patients were symptom free?
29
What nerve sends signals to the brain from the vestibular system about the direction and speed of motion
Vestibulocochlear nerve (CN VIII)
How does the vestibular system and brain differentiate between which direction the head is moving? besides the different SCC
depolarization versus hyperpolarization
What is a potential reason being discusses as to why some people may be more prone to the otoliths not adhering to the gelatinous surface and getting into the SCC?
Conditions which interfere with that could cause an individual to be prone to BPPV (ex: head trauma)
1.97
How long did they weight between procedures?
1-2 days
What structure contains the cupula
What is causing vertigo and nystagmus? in detail
•Otoconia crystals which belong in the utricle float into the anterior canal
•Which causes the endolymph to shift (causing bending of cupula)
•Which causes vertigo and nystagmus due to a false sense of motion being sent to the brain
What is a theory being discusses as to a pathway the crystals could be taking to get into the Anterior SCC
The nonampullary end of the ASCC is connected to the PSCC through the common crus which could be a pathway for the otoliths to enter the ASCC
What percentage of patients had resolved symptoms after just one time of doing the CRP?
46.7%