Masked Hypertension Diagnosis and Management

Definition and Clinical Significance

• Masked hypertension is defined as normal office blood pressure (<130/80 mm Hg by ACC/AHA criteria or <140/90 mm Hg by ESC/ESH criteria) but elevated out-of-office blood pressure (home BP ≥130/80 mm Hg or daytime ambulatory BP ≥135/85 mm Hg), and carries cardiovascular risk equivalent to sustained hypertension 1, 2

Epidemiology and Risk Factors

• The American College of Cardiology and the European Society of Cardiology recommend screening for masked hypertension in patients with office BP 120-129/75-79 mm Hg, particularly those with additional risk factors 1, 3
• The European Heart Journal suggests that risk factors for masked hypertension include alcohol consumption, physical activity/exercise-induced hypertension, obesity, diabetes mellitus, and chronic kidney disease 4

Diagnostic Approach

• The American Heart Association recommends confirming masked hypertension using home blood pressure monitoring (HBPM) or ambulatory blood pressure monitoring (ABPM), with ABPM preferred for definitive diagnosis 1, 2, 5
• The following blood pressure thresholds are used for diagnosis:

1, 2, 3, 5

Management Recommendations

• The European Heart Journal recommends treating masked hypertension with antihypertensive medications targeting out-of-office BP normalization, as cardiovascular risk equals sustained hypertension 4, 5
• The American College of Cardiology recommends initiating pharmacologic therapy from first-line drug classes: thiazide diuretics, calcium channel blockers, ACE inhibitors, or ARBs 7
• The treatment goal is to normalize out-of-office BP to <130/80 mm Hg (home/daytime ABPM <135/85 mm Hg) 1, 5

Special Populations

• The American College of Cardiology and the European Society of Cardiology recommend screening for masked uncontrolled hypertension (MUCH) in treated patients with office BP at goal but with target organ damage or increased CVD risk 1, 3

Common Pitfalls to Avoid

• The American Heart Association recommends not relying solely on office BP measurements in high-risk patients, and avoiding assuming normal office BP equals low cardiovascular risk without out-of-office confirmation 1, 5

Prognosis and Long-Term Implications

• Approximately 30-40% of patients with masked hypertension progress to sustained hypertension within 5-10 years 8
• Early detection and treatment can potentially prevent progression and reduce cardiovascular events 5, 4, 8