Right vs left sided stroke: how the deficits and nursing care differ

The best single clue: language or spatial awareness

Language sits in the left hemisphere in most people, so MSD Manuals links aphasia with damage to the dominant hemisphere and links sensory neglect and apraxia with the nondominant side. A client who cannot find words, or cannot follow a spoken instruction, points to a left sided stroke. A client who talks fluently but ignores the food on the left half of the tray points to a right sided one.

Behavior follows the same split. Patient education from US hospitals describes right hemisphere stroke with impulsivity, lack of concern and depth perception problems, and left hemisphere stroke with trouble in reasoning, math, reading and writing. Students often memorize the side of weakness and forget that behavior is the clue exam questions lean on.

Findings that do not settle which side

Weakness is contralateral, so it identifies the hemisphere only if you remember to flip it. Forgetting the flip is the most common student mistake: right sided weakness means a left brain stroke. Visual field loss on the opposite side, memory problems, depression and swallowing difficulty can follow damage to either hemisphere, so none of them points to one side on its own.

Neglect is not exclusive to the right hemisphere either; hospital education material also lists right sided neglect after a left hemisphere stroke. It is more striking after right parietal damage, where MSD notes patients may deny that a paralyzed left arm is weak at all, a finding called anosognosia. Brain stem and cerebellar strokes break the pattern, with poor coordination, dizziness and breathing or swallowing problems.

Nursing priorities after a right sided stroke

Safety drives the plan. A client who misjudges distance, acts before thinking and does not recognize the left arm as weak will try to stand alone, so fall precautions, a bed alarm per policy, frequent checks and short, concrete instructions matter more than lengthy teaching. Place the call light where the client will notice it, then teach scanning toward the neglected left side.

Protect the left limbs, because the client may not attend to a hand trapped beside the wheelchair or a foot dragging on the floor. Check that both sides of the meal tray are eaten and that the left side of the face is clean. Self-care often sounds better in conversation than it looks in practice, so watch a task rather than accept a verbal assurance.

Nursing priorities after a left sided stroke

Communication comes first. Ask yes or no questions, give one instruction at a time, use gestures and pictures, and allow extra time for answers. A client with expressive aphasia often understands more than they can say, so speak in a normal voice; shouting does not fix a language problem. Frustration and low mood are common because the client knows what they want to say.

Right sided weakness affects the dominant hand in most right-handed clients, so feeding, writing and grooming need adaptive equipment and occupational therapy input. The cautious style seen after many left sided strokes tends to help safety, yet the client may need encouragement to attempt tasks. Any stroke needs a swallow screen before oral intake under local protocol.

Hypothetical practice scenario

Hypothetical scenario, not a real exam item: a client is three days after a right hemisphere ischemic stroke. During morning care the client says, "I'm fine, I can walk to the bathroom myself," and pulls on the bed rail with the right hand. Which action is best: let the client walk with a cane, ask the client to describe the risks, or keep the bed alarm on and assist with toileting?

Keeping the alarm on and assisting is correct. The client probably has poor judgment and limited awareness of the left sided weakness, so self-report of ability is unreliable. Asking the client to describe the risks is the tempting option because it sounds client-centered, but it relies on the very insight that a right sided stroke tends to remove.

Sources and further reading

MSD Manual Professional Version: Overview of Stroke. Contralateral hemiparesis, aphasia with dominant hemisphere damage, apraxia and sensory neglect with nondominant hemisphere damage.

MSD Manual Professional Version: Overview of Cerebral Function. Left hemisphere typically dominant for language, right for spatial attention; nondominant parietal injury causes left neglect and anosognosia, including denial of left paralysis.

Nationwide Children's Hospital: Effects of Stroke. Right hemisphere effects (left weakness, left neglect, depth perception, impulsivity) vs left hemisphere effects (right weakness, aphasia, math and reasoning problems, right neglect); brain stem and cerebellar effects.