Early symptoms

• Repeatedly asking the same questions or forgetting recent conversations/events
• Misplacing items, including putting them in unusual places
• Trouble finding words, following conversations, or naming familiar objects
• Difficulty planning, managing money, cooking, taking medicines, or completing familiar tasks
• Getting lost in familiar places or having problems with time and place
• Poor judgment, such as being more vulnerable to scams
• Changes in mood, motivation, personality, or social withdrawal

Later symptoms

• Increasing confusion and inability to learn new information
• Trouble reading, writing, recognizing people, or communicating needs
• Agitation, anxiety, depression, wandering, sleep disturbance, or sometimes hallucinations/delusions
• Needing help with dressing, bathing, eating, toileting, and other daily activities
• In advanced stages, difficulty swallowing, walking, and controlling bladder or bowel function

When to seek assessment

• Clarify the cause of cognitive symptoms. Prior stroke, mini-strokes, atrial fibrillation, heart failure, poorly controlled blood pressure, diabetes, and high cholesterol can cause or contribute to vascular cognitive impairment. Many older adults have mixed dementia, meaning both Alzheimer-type and vascular brain changes.
• Prevent further vascular injury. The care team should optimize blood pressure, cholesterol, diabetes, smoking cessation, physical activity as safely tolerated, and treatment of conditions such as atrial fibrillation or heart failure. Medication changes should be clinician-led.
• Review all medicines. Some cardiac drugs can worsen dizziness or low blood pressure, while some medicines can affect memory or alertness. A pharmacist or clinician should review prescription drugs, over-the-counter products, and supplements together.
• Be cautious with common Alzheimer symptom medicines. Donepezil, rivastigmine, and galantamine can slow the heart rate and may contribute to fainting or heart block. Extra caution is needed with known conduction disease, a low resting pulse, unexplained fainting, pacemaker issues, or concurrent rate-slowing drugs such as beta-blockers. The FDA warns that donepezil can cause bradycardia, heart block, and syncope through effects on the heart’s electrical nodes, as described in the prescribing information.
• Check safety risks. Falls, driving, medication adherence, fluid balance, and ability to recognize chest pain or breathlessness may need support from family or caregivers.

1. Stroke and transient ischemic attack (TIA)
   • A stroke can cause sudden confusion, difficulty speaking, poor attention, or lasting problems with memory and planning.
   • Repeated small strokes or small-vessel brain disease can lead to vascular cognitive impairment. Decline may occur in steps, with abrupt worsening after a new stroke.
   • New facial droop, one-sided weakness, speech difficulty, or sudden confusion is an emergency.
2. Atrial fibrillation (AF)
   • This irregular rhythm raises the risk of clots traveling to the brain and causing overt or silent strokes.
   • It is associated with cognitive impairment and dementia risk, partly through stroke and reduced brain blood flow. Prevention of stroke, including appropriate anticoagulation when prescribed, is important.
3. Heart failure
   • When the heart cannot pump effectively, reduced blood flow to the brain, low blood pressure, poor oxygen delivery, sleep disruption, hospital illness, and medication effects can impair concentration and memory.
   • Symptoms may fluctuate or worsen during fluid overload, infection, dehydration, or a heart-failure exacerbation. A recent meta-analysis also supports an association between heart failure and cognitive impairment (PMID: 42120247).
4. Coronary artery disease and heart attack
   • Coronary disease shares important risk factors with vascular brain injury, including high blood pressure, diabetes, smoking, and high cholesterol.
   • A heart attack, especially if complicated by low blood pressure or low oxygen, can precipitate delirium or reveal pre-existing cognitive problems. The American Heart Association statement identifies coronary heart disease as linked with cognitive impairment.
5. Slow heart rhythm, heart block, or other significant arrhythmias
   • Marked bradycardia, pauses, or very fast rhythms can reduce blood flow to the brain, causing dizziness, fainting, fatigue, poor concentration, or episodic confusion.
   • Symptoms are often intermittent rather than a smooth progressive memory decline.
6. Low blood pressure or orthostatic hypotension
   • Blood pressure that drops on standing, from dehydration, illness, over-diuresis, or medication effects can cause lightheadedness, falls, blurred thinking, and transient confusion.
   • It is especially relevant in people taking diuretics, nitrates, blood-pressure medicines, or several rate-slowing medicines.
7. Valve disease or severe structural heart disease
   • Severe aortic stenosis and other conditions that limit cardiac output can cause exertional dizziness, fainting, fatigue, and reduced concentration. They do not usually produce isolated, steadily progressive Alzheimer-type memory loss, but they can worsen brain function.
8. Medication-related effects
   • Drugs used for heart disease can contribute indirectly if they cause low blood pressure, dehydration, electrolyte disturbance, or an overly slow pulse.
   • Conversely, Alzheimer medicines such as donepezil, rivastigmine, and galantamine can slow the heart rate and increase fainting risk, particularly in someone with conduction disease or on beta-blockers. This deserves a clinician-led medication and ECG review.