Quiet Delirium: When a Sleepy Resident Is Actually Sick

When people picture delirium, they often think of a resident who is agitated, pulling at lines or trying to climb out of bed. That kind is hard to miss. The quieter kind is easy to miss, and it can be just as serious.

A resident with hypoactive delirium may simply seem sleepy, slow or withdrawn. Staff may assume they are tired from the hospital, depressed or "just old." Recognizing that this can be a sudden change in brain function, and not a personality trait, is one of the most useful things a post-acute team can learn.

Two Faces of the Same Problem

Delirium is a sudden change in attention and thinking, usually triggered by an illness, a medication, dehydration, surgery or another stressor. A 2014 review in The Lancet by Inouye, Westendorp and Saczynski describes two main forms: hyperactive and hypoactive. Patients can move between them over the course of a single day.

The same review notes that the mainly hypoactive form is more common in older patients and has generally been associated with a worse prognosis. It also describes delirium overall as "under-recognised" and "easily overlooked."

What hypoactive delirium can look like on the unit:

• Sleeping much more than usual, or hard to keep awake during care or meals
• Staring, slow to respond or answering with very few words
• Losing track of a conversation partway through
• Not participating in therapy or activities they would normally do
• Eating or drinking less because they drift off or lose interest

How Common It Is at Admission

Delirium is common among people arriving for post-acute care. In a study of 2,158 admissions to seven Boston-area skilled nursing facilities, published in 2003 in the Journals of Gerontology, about 16% had delirium by the Confusion Assessment Method (CAM) at admission. More than two-thirds had at least one delirium symptom.

A separate 2003 study in the Journal of the American Geriatrics Society followed 551 older adults newly admitted to post-acute facilities. About 23% had delirium symptoms at admission. A week later, only about 14% of them had fully resolved. Residents whose symptoms persisted or worsened had poorer recovery in daily activities.

Why It Matters for Outcomes

Delirium is linked to worse results in post-acute care. A 2005 study by Marcantonio and colleagues in the Journal of the American Geriatrics Society compared patients admitted to post-acute facilities with and without delirium:

• 30% of patients with delirium were rehospitalized within 30 days, compared with 13% without
• 30% with delirium were discharged to the community within 30 days, compared with 73% without
• Six-month mortality was 25.0% with delirium, compared with 5.7% without

Patients with some, but not all, delirium features had outcomes in between. These are associations, not proof that delirium alone caused the outcomes, but they show why early recognition deserves attention.

How SNFs Screen for It

The CAM is the most widely used tool for identifying delirium, according to the Lancet review. It looks at four features: an acute change or fluctuating course, inattention, disorganized thinking and an altered level of consciousness. The review notes the CAM has been adapted for nursing homes and is part of the Minimum Data Set (MDS).

On the MDS, item C1310, "Signs and Symptoms of Delirium (from CAM)," captures those same four features over a seven-day look-back. The assessor observes the resident during the cognitive interview and also reviews the record and talks with staff and family who saw the resident during that week. CMS lists C1310 among the data elements used for the SNF Quality Reporting Program, including on the 5-day admission assessment.

That means a CNA's comment like "she was sharp yesterday, but today she keeps nodding off mid-sentence" is exactly the kind of information the MDS coordinator and nurse need.

Quick Checklist: What to Observe and Report

• Learn each new resident's baseline in the first day or two: how alert they are, how they talk and what they can do on their own. Ask family what is normal for them.
• Report any sudden change in alertness, attention or conversation to the nurse, even if the resident seems calm.
• Note when the change started and whether it comes and goes during the day or night.
• Pass changes on at shift handoff so the next shift can compare.
• Make sure the nurse and MDS coordinator hear about changes observed during the look-back period.

A daily admission screen can help by flagging residents at higher risk of delirium, so staff know whose baseline to learn first.

This article is general education for skilled nursing teams. Follow your facility's policies and the direction of your medical director and providers.