Masked hypertension: Prevalence, causes, diagnosis, and treatment

By: Mohan Garikiparithi | Blood Pressure | Thursday, July 13, 2017 - 08:00 AM

masked hypetensionMasked hypertension (MH) can be considered the opposite of white coat hypertension, which is when during a typical doctor’s office visit your blood pressure reads as being high despite being normal at home. The white coat effect is thought to be caused by increased anxiety, which leads to higher blood pressure readings. You can therefore say that a masked hypertension definition comprises having normal blood pressure in the doctor’s office, but high blood pressure at home.

This is a problem as having chronic high blood pressure can lead to serious health conditions over time, such as a stroke or heart attack. If your doctor can’t get accurate readings in the office, they may not recognize the problem and prescribe proper treatment.

A recent study comparing clinic blood pressure measurements to ambulatory blood pressure monitoring in middle-aged participants found that 15.7 percent had masked hypertension. It was more commonly seen in men than women and in those with borderline hypertension or pre-hypertension. Interestingly, younger, normal-weight participants were more likely to have masked hypertension than older, overweight subjects.

“These findings debunk the widely held belief that ambulatory blood pressure is usually lower than clinic blood pressure,” said Dr. Joseph E. Schwartz, lead author, professor of psychiatry and sociology at Stony Brook University, and lecturer at Columbia University. “It is important for health-care providers to know that there is a systematic tendency for ambulatory blood pressure to exceed clinic blood pressure in healthy, untreated individuals evaluated for hypertension during well-patient visits. Our study’s results may not apply to those who have previously been diagnosed as having hypertension or are already being treated for hypertension.”

What is masked hypertension?

Masked hypertension is a clinical condition where a person’s blood pressure reads much lower than it actually is when in the doctor’s office under normal conditions. This reading may be interpreted as being normal and therefore not raise any alarms for the need for high blood pressure medication.

Leaving high blood pressure undiagnosed and untreated can result in years of damage to blood vessels and organ tissue. This exposes people to serious dangers such as severe strokes and even sudden death. The best thing you can do is regularly measure your own blood pressure at home or at a blood pressure kiosk found in many drug stores. Report your results to your doctor.

Prevalence of masked hypertension

High blood pressure is a problem affecting millions of Americans today, but these cases often go unrecognized and untreated by doctors. The problem with masked hypertension is that it can be easily missed, so high blood pressure can inflict damage over an extended period of time.

Based on recent analysis, researchers estimate that 12.3 percent of Americans over the age of 21 have masked hypertension. This statistic translates to about one in every eight people or 17.1 million Americans.

What causes masked hypertension?

Various causes of masked hypertension include:

  • Sedentary behavior
  • Unhealthy lifestyle—including nicotine and alcohol addiction
  • Contraceptive pill use in women
  • Cardiovascular diseases and kidney diseases
  • Diagnosing and treating masked hypertension

Identification of masked hypertension can be a tricky endeavor as most people simply take their doctor’s word for it that they do or do not have a certain condition. Most people also don’t make much of an effort to keep track of certain chronic health conditions like high blood pressure, making the diagnosis of masked hypertension even more difficult.

The two most important tools that help in the proper diagnosis of masked hypertension are an ambulatory blood pressure monitor and a stationary home blood pressure monitor. Unfortunately, both of these tools can be expensive, which often discourages people from buying them. Consistent use of these tools is also required to obtain accurate results. If one device has to be chosen over the other, many medical professionals view home blood pressure monitoring as being more effective.

The following tips are recommended for recognizing and managing masked hypertension:

Know your numbers: The goal is to have blood pressure that is below 140/90 mmHg. You should have your blood pressure checked at least once a year.

Vary the setting: Check your blood pressure in more than one setting, as you may find there are variations in your numbers. Have your blood pressure checked in the community, at home, or at a pharmacy. Also, those already diagnosed with hypertension and taking medication for it should check their blood pressure on a consistent basis, making sure their treatment is working as it should.

Watch for symptoms: Normally, high blood pressure doesn’t present with symptoms, but some people may experience shortness of breath, chest discomfort, heart palpitations, headaches, or vision changes. If you experience any of these symptoms, speak to your doctor right away.

Change your lifestyle: Dropping bad habits such as smoking and reducing alcohol consumption can be enough to help lower blood pressure. Incorporating regular exercise, eating a healthy diet, lowering sodium intake, and reducing stress can also help

Masked hypertension vs. white coat hypertension

Masked hypertension and white coat hypertension both produce abnormal outcomes at the doctor’s office. However, white coat hypertension is when blood pressure is falsely high when measured by the doctor, and masked hypertension is when blood pressure is falsely low when measured by the doctor.
Both conditions give a false impression of what your blood pressure range actually is, and they can be problematic down the road if not recognized.

Related: Essential oils for high blood pressure and how to use them

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