Case 22 of 40
Delirium may persist after pneumonia in someone with dementia
Example case for staff education
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Page 1
Panel 1: Before illness
Idris has dementia but usually feeds himself and chats.
Sara: He tells me when something is wrong.
Panel 2: Day 1
Fever, breathlessness and new drowsiness develop over two days.
Sara: This is very different from his usual day.
Panel 3: Day 1
Pneumonia and an acute change in attention support delirium.
Ward doctor Amira: We will treat the infection and assess the other possible causes.
Panel 4: Day 2
Oxygen, antibiotics and carefully assessed fluids are given.
Nurse Tom: I will explain each step before I touch him.
Panel 5: Day 4
Temperature and breathing improve; eating does not.
Sara: He has stopped knowing what to do with the spoon.
Panel 6: Day 4
He coughs with a drink; swallowing assessment is requested.
Nurse Tom: Pause there. I will get his swallowing checked.
Panel 7: Day 5
An individual swallowing and nutrition plan begins.
Physiotherapist Lin: He needs help with every meal for now.
Panel 8: Day 7
New hypoxia and chest signs prompt reassessment.
Ward doctor Amira: This is a new deterioration, not just the same confusion.
Panel 9: Day 7
A new aspiration pneumonia complicates the course.
Sara: He was only just starting to improve.
Page 2
Panel 10: Day 10
The second infection responds to treatment.
Nurse Tom: His breathing is better. He still needs help to drink.
Panel 11: Day 12
A familiar sentence is followed by marked inattention.
Idris: Did we leave the kitchen light on?
Panel 12: Day 14
Delirium persists despite improving blood tests.
Ward doctor Amira: Physical stability does not mean his thinking has recovered.
Panel 13: Week 3
Movement and familiar activities are adapted to his attention.
Physiotherapist Lin: Let us stand together, then rest.
Panel 14: Week 3
His current needs exceed what Sara can provide alone.
Sara: I cannot safely stay awake all night.
Panel 15: Week 4
Transfer includes the baseline, remaining symptoms and swallowing plan.
Nurse Tom: Please reassess him tomorrow and after any new change.
Panel 16: Week 5
Some mornings improve; evenings remain difficult.
Idris: I do not know where I should be.
Panel 17: Week 6
Fluctuating inattention still supports persistent delirium.
Ward doctor Amira: We will look again for illness, discomfort and medication effects.
Panel 18: Week 6
No new acute cause is found; support continues.
Sara: He is stronger, but he is not himself.
Page 3
Panel 19: Month 3
Marked fluctuation has reduced; substantial cognitive difficulty remains.
Nurse Tom: He needs cues throughout the meal.
Panel 20: Month 3
The remaining impairment cannot be explained from one brief assessment.
Ward doctor Amira: We need repeated assessment alongside what you knew before admission.
Panel 21: Month 3
They share brief moments of recognition and enjoyment.
Sara: He still enjoys sitting with me.
Panel 22: Month 4
Staff continue checking pain, toileting and other unmet needs.
Nurse Tom: Let us stop and find out what hurts.
Panel 23: Month 4
Support follows his actual abilities rather than a recovery deadline.
Ward doctor Amira: Record what he can do and when he needs help.
Panel 24: Month 5
Respite and shared care allow her to remain involved.
Sara: I can be his wife without providing every hour of care.
Panel 25: Month 6
There has been no return to his earlier cognitive functioning.
Ward doctor Amira: We will continue reviewing his health, comfort and cognition.
Panel 26: Month 6
Physical stability coexists with greater dependence.
Nurse Tom: He can walk with us, but cannot manage alone.
Panel 27: Month 6
The story ends with continuing care and an uncertain trajectory.
Sara: We still have good moments together.
Sources
- [P41] Cole MG. Persistent delirium in older hospital patients. Current Opinion in Psychiatry. 2010;23:250–254.
- [P42] Cole MG, McCusker J, Bailey R, Bonnycastle M, Fung S, Ciampi A, Belzile E. Partial and no recovery from delirium after hospital discharge predict increased adverse events. Age and Ageing. 2017;46:90–95.
- [P43] Dharmarajan K, Swami S, Gou RY, Jones RN, Inouye SK. Pathway from Delirium to Death: Potential In-Hospital Mediators of Excess Mortality. Journal of the American Geriatrics Society. 2017;65:1026–1033.
- [T02] MacLullich AMJ. Persistent delirium. CHG Singapore teaching presentation, 2025. Teaching slides.
- [G01] National Institute for Health and Care Excellence. Delirium: prevention, diagnosis and management in hospital and long-term care. CG103.



Commentary
Idris had dementia before admission, but staff still need to know what he could usually do. New drowsiness, difficulty paying attention and loss of familiar conversation need assessment as recent changes. Dementia increases his vulnerability to delirium; it does not explain these new changes by itself [G01].
His temperature and breathing improve with antibiotics and supportive care, but he still has difficulty eating and swallowing. The later aspiration pneumonia is a new illness that needs a new assessment. Throughout both illnesses, staff continue helping with drinking, mouth care, movement and communication [P43].
One coherent conversation does not establish recovery. At six weeks, continuing variation in attention supports persistent delirium. By three months, the variation is less obvious, but Idris still has substantial difficulties with thinking and daily activities. The case leaves open whether these difficulties reflect continuing delirium, progression of dementia or both. Repeated assessment and comparison with his abilities before illness are needed.
Cole’s review and follow-up study describe full, partial and absent recovery [P41, P42]. These categories can help describe Idris’s progress, but they do not establish that his impairment is irreversible. At six months, he has not regained his previous abilities. Plan care around what he can do and what Sara can provide, and continue clinical follow-up while his longer-term outcome remains uncertain.