How to identify balance disorders and reduce fall risk

The medical and surgical histories are key pieces of information. The history of smoking, alcohol habits, and substance use is relevant.

A robust medication history is essential to evaluate a patient’s risk of falling. Polypharmacy—typically, defined as taking 4 or more medications—has been repeatedly associated with a heightened risk of falls.^53,59-61 Moreover, a dose-dependent association between polypharmacy and hospitalization following falls has been identified, and demonstrates that taking 10 or more medications greatly increases the risk of hospitalization.⁵⁹ Studies of polypharmacy cement the importance of inquiring about medication use when assessing imbalance, particularly in older patients.

Physical examination

A focused and detailed physical examination provides insight into systems that should be investigated:

• Obtain vital signs, including orthostatic vitals to test for orthostatic hypotension⁶²; keep in mind that symptoms of orthostatic dizziness can occur without orthostatic hypotension.
• Examine gait, which can distinguish between causes of imbalance (TABLE 2).^21,40,63-70
• Perform a cardiac examination.
• Assess visual acuity and visual fields; test for nystagmus and identify any optic-nerve and retinal abnormalities.
• Evaluate lower-limb sensation, proprioception, and motor function.
• Evaluate suspected vestibular dysfunction, including dysfunction with positional testing (the Dix-Hallpike maneuver⁷¹). The patient is taken from sitting to supine while the head is rotated 45° to the tested side by the examiner. As the patient moves into a supine position, the neck is extended 30° off the table and held for at least 30 seconds. The maneuver is positive if torsional nystagmus is noted while the head is held rotated during neck extension. The maneuver is negative if the patient reports dizziness, vertigo, unsteadiness, or “pressure in the head.” Torsional nystagmus must be present to confirm a diagnosis of benign paroxysmal positional vertigo.
• If you suspect a central nervous system cause of imbalance, assess the cranial nerves, coordination, strength, and, of course, balance.

CASE

Mr. J’s physical examination showed normal vital signs without significant postural changes in blood pressure. Gait analysis revealed a slowed gait, with reduced range of motion in both knees over the entire gait cycle. Audiometry revealed symmetric moderate sensorineural hearing loss characteristic of presbycusis.

Diagnostic investigations

Consider focused investigations into imbalance based on the history and physical examination. We discourage overly broad testing and imaging; in primary care, cost and limited access to technology can bar robust investigations into causes of imbalance. However, identification of acute pathologies should prompt immediate referral to the emergency department. Furthermore, specific symptoms (TABLE 1^7-56) should prompt referral to specialists for assessment.

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