Orthostatic Hypotension in Parkinson’s: Why Standing Up Makes You Faint

If the room greys out when you stand up, that is a blood pressure problem, and in Parkinson’s it usually has two causes at once: the disease itself affects the nerves that control blood pressure, and several Parkinson’s medications lower it further. It is treatable, and it matters more than it feels like it should — because it is a leading route to a fall.

What it is

Orthostatic hypotension is a sustained drop in blood pressure on standing — conventionally defined as a fall of at least 20 mmHg systolic or 10 mmHg diastolic within three minutes of standing up. In Parkinson’s it is neurogenic: the autonomic nerves that should tighten blood vessels as you rise do not respond properly.

The familiar symptom is light-headedness. The less familiar ones are worth knowing because they are routinely missed:

• Aching across the back of the neck and shoulders after standing — often called coat-hanger pain
• Blurred or greying vision
• Sudden heavy fatigue, or difficulty thinking clearly, that eases on sitting
• Falls with no other explanation, sometimes with no warning symptom at all

Why it gets worse after a medication change

Levodopa and dopamine agonists both lower blood pressure. So a drop that appears or worsens shortly after a dose increase is not a coincidence, and it is one of the few Parkinson’s symptoms where the treatment and the disease pull in the same unhelpful direction. This is worth reporting precisely: what you took, how long before, and what you were doing.

The complication: high blood pressure lying down

Many people with neurogenic orthostatic hypotension also have supine hypertension — blood pressure that runs high while lying flat. This is the reason management is not simply “raise the blood pressure”: anything that helps standing can worsen lying, and vice versa. It is also why readings taken only while seated in a clinic can miss the problem entirely. Lying and standing readings, at home, across the day, are far more informative.

What is tried first, and it is not a drug

• Rise in stages. Sit on the edge of the bed, wait, then stand with something to hold.
• Fluid and salt — increased deliberately, but only if your clinician agrees, because heart and kidney conditions change this advice completely.
• Compression. An abdominal binder is generally more effective than stockings, because the abdomen is where blood pools.
• Raise the head of the bed a few inches. This helps supine hypertension overnight and can improve morning standing.
• Watch large meals, especially carbohydrate-heavy ones, and hot baths — both divert blood away from the circulation you need for standing.

When these are not enough, medications specifically for neurogenic orthostatic hypotension exist, including midodrine, droxidopa and fludrocortisone. Which one suits depends heavily on whether you also have supine hypertension, and on your heart and kidney function.

The reason to treat it

Falls change the trajectory of Parkinson’s more than almost any other single event. Blood pressure that drops on standing produces exactly the situation that causes them — a person upright, moving, and briefly unable to see or think clearly. Treating it is fall prevention. Our room-by-room home safety guide covers the rest of that picture.

Questions worth asking

• Should I be taking lying and standing readings at home, and how often?
• Could any of my current medications be contributing — including ones not for Parkinson’s?
• Do I also have high blood pressure lying down?
• Is extra salt and fluid safe for me specifically?

Sources

• NINDS — Parkinson’s Disease (National Institute of Neurological Disorders and Stroke, NIH)
• Parkinson’s Foundation — Low Blood Pressure
• FDA Drugs@FDA — approved prescribing information for the drugs named here

This is general information, not medical advice. Do not start, stop or change any medication, or add salt to your diet, without talking to your clinician.