Giddiness
Giddiness or dizziness are terms used by patients to describe a wide variety of sensations. It is crucial to obtain a precise understanding of the patient’s presenting complaint in order for clinical evaluation to proceed along appropriate lines. Table 1 summarizes the symptoms commonly described as ‘giddiness’.
Symptom | Clinical interpretation | Comment |
---|---|---|
Feeling of relative movement (usually spinning) of self and environment | Vertigo | Peripheral or central vestibular disturbance |
Feeling of lightheadedness and impending faintness | Presyncope | See page 44 |
Feeling of altered awareness and impaired consciousness | Altered consciousness | Consider complex partial seizures, absence attacks |
Unsteadiness with a clear head | Ataxia | Cerebellar or proprioceptive |
Vertigo
Clinical assessment
Key features in the clinical assessment are as follows:
Head movement: is vertigo triggered by certain head positions? This usually signifies a peripheral lesion, most commonly BPPV.
Auditory dysfunction: is there deafness or tinnitus? This points to a disturbance of the labyrinth or vestibulocochlear nerve. Once in the brain stem, auditory and vestibular function are separate.
Medication: anticonvulsant toxicity causes vertigo and aminoglycosides cause irreversible vestibular damage.