Solve the Medical Riddle: She Kept Losing Her Balance and She Had Memory Lapses, Fourth Week

Editor’s note: Welcome to our ThirdAge feature that gives you a chance to play medical sleuth as we share the details of what happened when a patient presented with a problem that stumped the physician at first.

The first week of this riddle, the patient reported her symptoms to her PCP. The doctor gave her a complete examination using the components of the classic S-O-A-P notes, which are as follows:

S=Symptoms or Chief Complaint

O=Objective Findings

A=Assessment or Analysis

P=Treatment Plan or Recommendation

The doctor also ordered tests and referred Carol to a neurologist. The second week, the doctor reported on the results of Carol’s tests and the neurologist did a spinal tap. Last week, we let you know what some people had suggested as possible diagnoses. This week, the doctor will reveal the actual diagnosis. Then we’ll begin a new riddle for the following month!

The Doctor Reveals the Diagnosis

All of the guesses were good ones, but no one got the actual diagnosis. As Carol’s PCP, I was pretty sure even before she went to a neurologist that she had what is popularly called “water on the brain”. The medical term is normal pressure hydrocephalus, or NPH. This condition is more common than you may think. It most often presents with a subtle process over many months to even a year or so. It starts with embarrassing incontinence, a slight change in gait to more wide-based and shuffling like Parkinson’s, and of course dementia.

What’s critical is that this is in most cases the one TREATABLE cause of dementia. Pardon me for “shouting” but this is so important! Early evaluation is s vital. The treatment, with a shunt in the brain to drain fluid into the rest of the body, is not guaranteed however. I had a young patient with NPH caused by tetracyclines for acne that were used a lot in the past. She was successfully treated by avoiding the drugs and taking a diuretic called Diamox.

However, more often the cause is unknown and is linked to older age. Presumably there is something that happens to very gradually slow the drainage of fluid out of the brain ventricles leading to a continuing build up of fluid in the ventricles, which leads to stretching of ventricles to point they can’t easily be reversed. The enlarging ventricles filled with backed up fluid gradually compress healthy brain tissue. Perhaps the elderly have more compromised brain tissue from circulatory disease, making them more vulnerable to dementia.

The only treatment in the elderly with no known cause is to place a shunt in the brain to divert fluid and allow for shrinkage of ventricles if the condition is not caught not too late. The shunt reduces excess fluid build up and stops the compression of brain tissue.

Yet if treatment is done after the disease process has progressed for a long time, the shunt may be too late to reverse brain damage. The earlier the diagnosis and treatment, the better the outcome. Family members and caregivers need to be alert to this. Symptoms can be very subtle and cumulative, so often no one really pays attention. Normal pressure hydrocephalus may occur due to a variety of secondary causes but may be idiopathic (no known cause) in approximately 50% of patients. Secondary causes of NPH include a previous history of head injury, subarachnoid hemorrhage, meningitis, and central nervous system tumor, and possibly medications.

Carol responded well to the spinal tap, but external lumbar drainage (ELD) is gaining acceptance as a more sensitive predictor in patients who do not have a significant response to a spinal tap test. A lumbar spinal catheter is inserted and cerebral spinal fluid is drained slowly for 72 hours.

However, cerebral spinal fluid shunting remains the main treatment for NPH. This is what Carol had done. Here is her take on the surgery and the results:

“Was I scared before the surgery? You bet I was! But I knew I was in good hands and I was relieved that there was a treatment option available. So now I have a  permanent shunt in my brain! Wow! You wouldn’t even know it, though. I combed my hair over the shaved part, and that hair is growing back. I’m walking normally, exercising the way I used to, and I have no more memory problems! That is like a miracle to me. The walking is important, but not losing my mind is even more important. To celebrate, I signed up for French classes at the local community college and I’m a star student! Next summer, my daughter and I plan to take a trip to France so I can use my new language skills. Life is good! Please, if you have any symptoms similar to mine, don’t write them off as signs of aging. Get checked out. The mind you save could be your own!”

Come back to ThirdAge.com next Thursday when we’ll introduce a new medical riddle!

Marie Savard, M.D., a former Medical Contributor for ABC News and a frequent keynote speaker around the world, is one of the most trusted voices on women’s health, wellness, and patient empowerment. She is the author of four books, including one that made the Wall Street Journal list of the best health books of 2009: “Ask Dr. Marie: What Women Need to Know about Hormones, Libido, and the Medical Problems No One Talks About.” Dr. Marie earned a B.S. in Nursing and an M.D. degree at the University of Pennsylvania. She has served as Director of the Center for Women’s Health at the Medical College of Pennsylvania, technical advisor to the United Nations’ Fourth World Conference on Women in Beijing, advisor to the American Board of Internal Medicine Subcommittee on Clinical Competency in Women’s Health, health columnist for Woman’s Day magazine, and senior medical consultant to Lifetime Television’s Strong Medicine. Please visit DrSavard.com.

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