Timothy C. Hain, MD, • Most recent save: February 16, 2023
Rocking dizziness or vertigo means that one has a sensation of movement such as on a boat. Practically, there may be a sensation of periodic rotation, or a sensation of sway. The rocking sensation is rarely accompanied by true vertigo (i.e. spinning). Sometimes these patients are called "rockers". Another term that can be used is "non motion triggered mal de debarquement".
Usually rockers are "diagnosed" with one of three syndromes that are defined by symptoms alone -- vestibular migraine, mal de debarquement, and PPPD. In essence, these are all chronic "dizzy" conditions, without any findings on testing. It is often not possible to distinguish between the diagnoses, and treatment is somewhat overlapping as well.
Feature VM (vestibular migraine) PPPD (persistent postural perceptive dizziness) MdDS (Mal de debarquement syndrome) Headache Yes Not required, but OK Not required, but OK. Improve with driving No No Yes Previous vertigo No Yes, or other event Not from inner ear, but may have previous motion exposure
Calculators for these three conditions are available VM calculator, PPPD calculator, MdDS calculator. Meniere's disease is not generally in the "running" for diagnosis here because most cases of Meniere's disease have hearing loss, and if there is hearing loss, Meniere's is the usual thought.
The table above gives rough guidelines that are suggested to distinguish the 3 groups -- practically though, there is a gigantic amount of overlap. A large fraction of the population has headache (for example). Patients with MdDS (mal de debarquement) often overlap with the demographics of vestibular migraine. PPPD explicitly overlaps with VM, and can be "diagnosed" in persons who have many other conditions (Staab et al, 2017). PPPD and MdDS differ in that PPPD gets worse with "active or passive motion". Still, someone who gets better when they drive (active motion), but are worse when they are a passenger (passive motion), could meet the criteria for PPPD.
Little is know about the cause of rocking sensation. In theory, it might be due to disturbance in the vertical semicircular canals of the inner ear (see figure above), due to a disturbance in the sensors for linear acceleration, the otoliths, or a disturbance in the central connections of these structures. As presently our ability to test these structures is very limited, it is difficult to be sure. In this regard, considerable recent progress have been made in assessing the otoliths (VEMP testing).
Considering these and other causes:
Rocking, like most types of dizziness, is usually worse when individuals are under stress.
|Diffusion image showing low blood flow in parietal operculum, associated with rocking symptom. This is very rare and it is not reasonable to check for this in rockers.|
Note that on the above list, we don't have any specific tests for vestibular migraine, PPPD or MdDS. The purpose of doing the above is to find something other than these three.
Persons with rocking should be examined by a physician with expertise in inner ear disorders as well as neurological disorders.
If you are wondering if you have PPPD, we recommend taking the PPPD questionnaire to see if it is an option.
Testing that may be recommended for rockers can include:
- ENG test and/or VHIT test. (rules out vestibular neuritis) -- VHIT is much better tolerated. Very useful !
- Hearing test (for possible Meniere's disease, other ear damage -- very important !)
- VEMP test ( including both SCM (neck) and ocular type (oVEMP), diagnoses SCD) -- Very useful (especially oVEMP).
- Rotatory chair (checking for central forms of vertigo, fixation suppression/rebound is most useful)
- Posturography (quantifies balance, somewhat sensitive to PPPD). Can show a non-sensory unsteadiness, or high values for amplitude scaling.
- ECOG (for Meniere's disease) -- not commonly done as Meniere's disease usually doesn't present with rocking.
- MRI scan (for central forms of vertigo such as Chiari, stroke, MS, or tumors of inner ear). Other possible procedures include MRV and CT angiography. These are generally expensive tests with low yield. Not usually neededbut it does tick off another group of disorders.
- CT scan of the temporal bone (for SCD). Should not be done unless a VEMP test is positive.
- Blood tests including FTA, Sed-rate, ANA, B12 (where there is a reasonable suspicion of one of these disorders). B12 is the most useful here as it becomes common in persons with advancing age. Just check in persons with appropriate history.
|SNRI (venlafaxine)||Yes||Yes (also SSRI)||Yes|
|Benzodiazepines||No||No||To prevent recurrence|
|Physical therapy and/or visual therapy||No||Yes||No|
Treatment varies somewhat by the primary diagnostic entity, but as this is often unclear, often all of the above are tried. Benzodiazepines, such as clonazepam usually are very effective for rocking in general, including MdDS, but of course are also addictive(Canceri et al, 2018). SSRIs (such as Paroxetine) or SNRI type antidepressants (such as venlafaxine) are also often worth considering, in very low doses (Liu et al, 2017). Vestibular rehabilitation therapy should also be tried, especially in PPPD. Visual rehabilitation therapy is sometimes helpful for the visual vertigo that is part o the PPPD diagnostic criteria. CBT psychotherapy is also recommended for PPPD. (Popkirov, 2018)