Which condition would indicate to the nurse that the patient has a phenytoin (Dilantin) toxicity?

A. Pupil response:

Pupil response refers to the reaction of the pupils to light stimulus. The pupils should normally constrict when exposed to bright light and dilate in dim light. Changes in pupil size or reactivity can indicate alterations in neurological function. For example, unequal or non-reactive pupils (anisocoria or fixed pupils) can be indicative of dysfunction in the cranial nerves or brainstem. However, while pupil response is an important aspect of neurological assessment, it may not always be the earliest indicator of cerebral status changes.

B. Deep tendon reflexes:

Deep tendon reflexes are involuntary muscle contractions in response to stretching of a muscle tendon. These reflexes are assessed by tapping the tendon with a reflex hammer, eliciting a rapid and brief muscle contraction. Changes in deep tendon reflexes can provide information about the integrity of the peripheral nervous system and spinal cord. However, alterations in deep tendon reflexes may occur secondary to changes in cerebral function and are typically assessed along with other neurological signs.

C. Muscle strength:

Muscle strength refers to the force generated by muscles during voluntary movement. It is typically assessed by asking the client to perform specific movements against resistance or by testing the strength of individual muscle groups using standardized scales (e.g., Medical Research Council scale). Changes in muscle strength can occur due to neurological or musculoskeletal conditions. While weakness or paralysis can result from lesions affecting the upper motor neurons (e.g., strokes or spinal cord injuries), alterations in muscle strength may not always be the earliest indicator of cerebral status changes.

D. Level of consciousness:

The level of consciousness refers to the degree of awareness and alertness exhibited by the client. It is assessed by evaluating the client's responsiveness, orientation, and ability to follow commands. Changes in the level of consciousness, such as confusion, lethargy, stupor, or coma, can indicate alterations in cerebral function and are often the earliest indicators of neurological dysfunction. Assessing the level of consciousness is a critical component of neurological examination and helps guide further assessment and management of clients with suspected brain tumors or other neurological conditions.

A. Dizziness and problems with balance

While dizziness and problems with balance can occur more frequently in older adults due to age-related changes in the vestibular system and other factors, persistent or severe dizziness or balance issues should be evaluated further as they could indicate underlying neurological or medical conditions.

B. Slow papillary response to light

This finding may be considered abnormal, especially if it represents a significant change from the individual's baseline. While age-related changes in pupil function can occur, a slow or sluggish pupillary response to light may indicate dysfunction of the oculomotor nerve or other neurological issues and should be investigated further.

C. Jerky eye movements

Jerky eye movements, such as nystagmus, can be abnormal and may indicate dysfunction of the vestibular system or other neurological conditions. While some degree of nystagmus can occur with age, persistent or severe jerky eye movements should be evaluated further.

D. Absence of the Achilles tendon jerk

This finding may also be considered abnormal. The Achilles tendon reflex, tested using the deep tendon reflex (DTR) examination, can diminish with age but should not be completely absent in the absence of specific medical conditions affecting the reflex arc or spinal cord function.