Vestibular nerd here, so I want to give this a shot. Chrissy and the rest of the NCS Advantage community – correct me if I am wrong!
Cally, totally understandable to be confused about which CRMs are appropriate for each type of BPPV. There are so many variations/types of CRMs!
For horizontal canalithiasis, both the BBQ roll and the Gufoni maneuver can be used.
For horizontal cupulolithiasis, the Kim maneuver can definitely be used but be aware that there is a version of Gufoni maneuver that can also be used to treat this type of BPPV (this is where some confusion can arise).
Really important to be able to identify the involved side with horizontal canalithiasis so you know which CRM to ultimately use – another area that can stump clinicians.
I would recommend being familiar with the BPPV CPG – Bhattacharyya, N., Gubbels, S. P., Schwartz, S. R., Edlow, J. A., El-Kashlan, H., Fife, T., Holmberg, J. M., Mahoney, K., Hollingsworth, D. B., Roberts, R., Seidman, M. D., Steiner, R. W., Do, B. T., Voelker, C. C., Waguespack, R. W., & Corrigan, M. D. (2017). Clinical Practice Guideline: Benign Paroxysmal Positional Vertigo (Update). Otolaryngology–head and neck surgery : official journal of American Academy of Otolaryngology-Head and Neck Surgery, 156(3_suppl), S1–S47. https://doi.org/10.1177/0194599816689667.
Just be aware – the more you deep dive into vestibular literature, the more you may get confused with all the variations of CRMs! I would start with this CPG and know the foundational/highly researched maneuvers. Hope this helps! Happy to expand if needed.