Understanding the World's Two Most Important Blood Pressure Guidelines: What Patients Should Know

Table of Contents

• Key Points
• Why These Guidelines Matter
• How the Guidelines Were Created
• Blood Pressure Measurement: Getting It Right
• How Blood Pressure Is Classified
• What Happens During a Patient Evaluation
• Assessing Your Heart Disease Risk
• Lifestyle Changes: The Foundation of Treatment
• When to Start Blood Pressure Medication
• What This Means for Patients
• What These Guidelines Couldn't Determine
• Recommendations for Patients
• Frequently Asked Questions
• Source Information

Key Points

• Both guidelines agree lifestyle changes are the foundation of prevention and treatment.
• The American threshold for hypertension is 130/80; the European is 140/90.
• Home blood pressure of 135/85 or higher corresponds to an office reading of 140/90.
• Confirming office hypertension with home or ambulatory monitoring is recommended by both guidelines.
• Treatment decisions depend on overall heart disease risk, not just the blood pressure number.

Why These Guidelines Matter

Few areas of medicine offer a better opportunity for making decisions based on sound scientific evidence than the prevention and management of high blood pressure (hypertension). High blood pressure is one of the most common conditions affecting adults worldwide, and it is a major contributor to heart attacks, strokes, kidney failure, and premature death.

The 2017 ACC/AHA guideline, developed in partnership with 9 other professional societies, is formally titled the "Guideline for the Prevention, Detection, Evaluation, and Management of High Blood Pressure in Adults." One year later, the European Society of Cardiology and the European Society of Hypertension published the 2018 ESC/ESH Guidelines for the Management of Arterial Hypertension.

Together, these two documents are among the most cited and influential clinical practice guidelines for blood pressure in the world. This article explains their key recommendations, highlights where they agree and differ, and helps patients understand what the science means for their own care.

How the Guidelines Were Created

Both guidelines were built on rigorous scientific methods, though the details of their processes differed. The ACC/AHA guideline was written by a 21-member committee that included primary care physicians, specialists, epidemiologists, a nurse, a physician assistant, a pharmacist, and two lay/patient members. Members were chosen for their expertise and their ability to represent the two principal sponsors (ACC and AHA) plus 9 collaborating professional societies. A key requirement for participation was having no financial relationships with blood pressure–related commercial entities.

The ESC/ESH guideline was developed by a larger, 28-member committee of physicians and nurses selected from 14 European countries, with half chosen by the ESC and half by the ESH. Unlike the American committee, European members were required to disclose (rather than avoid) any industry relationships.

The ACC/AHA process mandated systematic reviews and meta-analyses conducted by an independent Evidence Review Committee, plus the creation of 448 detailed evidence tables to support the recommendations. The ESC/ESH committee concluded that already-published systematic reviews and meta-analyses provided sufficient evidence, though they had the option to commission additional reviews.

Both documents underwent extensive peer review and required final approval from the governing boards of their sponsoring organizations. The final products are substantial:

• ACC/AHA guideline: 106 formal recommendations and 103 pages
• ESC/ESH guideline: 122 formal recommendations and 84 pages

In both documents, each recommendation is graded by a class of recommendation (reflecting how strongly it is advised) and a level of evidence (reflecting how solid the supporting science is). Committee members voted on the wording and grading of every single recommendation.

Blood Pressure Measurement: Getting It Right

Errors in measuring blood pressure are a major source of misclassification—meaning patients may be incorrectly labeled as having (or not having) hypertension. Both guidelines place strong emphasis on using validated devices and taking multiple readings for accurate diagnosis and management.

The ACC/AHA guideline recommends averaging office blood pressure readings, using at least 2 readings on at least 2 separate occasions. It also recommends confirming office-based hypertension with out-of-office measurements (home or ambulatory monitoring) to catch "white coat hypertension" (elevated readings only in the doctor's office) and "masked hypertension" (normal office readings but elevated readings at home).

The ESC/ESH guideline recommends 3 readings for office measurement, with additional readings when the first 2 differ by 10 mm Hg or more, or when blood pressure is unstable due to an irregular heartbeat. The reading is recorded as the average of the last 2 measurements. It also advises confirming office hypertension either with repeated office readings at several visits or with out-of-office monitoring.

Both guidelines recommend recording heart rate during blood pressure measurements, and the ESC/ESH considers a resting heart rate above 80 beats per minute to be a cardiovascular risk factor.

To help patients and doctors interpret home and 24-hour monitor readings, both guidelines provide comparison tables. For example, an office blood pressure of 140/90 mm Hg corresponds roughly to:

• Home readings: 135/85 mm Hg
• Daytime (awake) ambulatory readings: 135/85 mm Hg
• Nighttime (sleep) readings: 120/70 mm Hg
• 24-hour average: 130/80 mm Hg

The ACC/AHA provides a full equivalence table ranging from 120/80 to 160/100 mm Hg for office readings. The ESC/ESH provides equivalence values only for the hypertension diagnosis threshold of 140/90 mm Hg, but these values match the American ones.

How Blood Pressure Is Classified

This is the most obvious difference between the two guidelines. The ACC/AHA uses a simpler system with 4 categories:

• Normal: less than 120/80 mm Hg
• Elevated: systolic 120–129 mm Hg and diastolic less than 80 mm Hg
• Stage 1 hypertension: systolic 130–139 mm Hg or diastolic 80–89 mm Hg
• Stage 2 hypertension: systolic 140 mm Hg or higher or diastolic 90 mm Hg or higher

The ESC/ESH uses a more detailed classification with 6 categories:

• Optimal: less than 120/80 mm Hg
• Normal: systolic 120–129 mm Hg and/or diastolic 80–84 mm Hg
• High normal: systolic 130–139 mm Hg and/or diastolic 85–89 mm Hg
• Grade 1 hypertension: systolic 140–159 mm Hg and/or diastolic 90–99 mm Hg
• Grade 2 hypertension: systolic 160–179 mm Hg and/or diastolic 100–109 mm Hg
• Grade 3 hypertension: systolic 180 mm Hg or higher and/or diastolic 110 mm Hg or higher
• Isolated systolic hypertension: systolic 140 mm Hg or higher with diastolic below 90 mm Hg

The American change from the older 140/90 threshold to 130/80 mm Hg was a significant departure from the previous 2003 Joint National Committee 7 guideline. Those older guidelines had used the 130/80 threshold only for patients with diabetes or chronic kidney disease.

The impact of this reclassification is substantial. Using data from the 2011–2014 National Health and Nutrition Examination Survey (NHANES), researchers estimated:

• 24.1% of US adults (age 20+) were already taking antihypertensive medication and therefore considered to have hypertension
• Of those not taking medication, 7.7% had blood pressure of 140/90 or higher
• Another 13.7% had blood pressure in the 130–139/80–89 range
• Using the 130/80 threshold, the estimated hypertension prevalence in US adults was 46%, compared to 32% using the 140/90 threshold

This represents an approximately 14% population increase in the number of adults classified as having hypertension. The difference was most pronounced in younger adults and in men compared to women. It's worth noting that these estimates may be somewhat inflated, since blood pressure was measured on a single occasion and not confirmed with out-of-office readings.

The ACC/AHA classification captures more of the blood pressure–related risk for cardiovascular disease, but it creates a greater challenge for doctors: more patients are labeled as having hypertension, and treatment decisions for stage 1 hypertension require assessment of underlying heart disease risk.

What Happens During a Patient Evaluation

Both guidelines recommend that doctors take a thorough personal and family history, perform a physical examination (including blood pressure measurement), and order basic laboratory tests. The recommended tests overlap substantially, with both guidelines requiring:

• Fasting blood glucose
• Blood/serum sodium and potassium
• Lipid profile (cholesterol and triglycerides)
• Serum creatinine and estimated glomerular filtration rate (eGFR, a measure of kidney function)
• Urinalysis
• Electrocardiogram (ECG)

The ACC/AHA additionally recommends a complete blood count, serum calcium, and thyroid-stimulating hormone. The ESC/ESH additionally recommends hemoglobin/hematocrit, blood uric acid, glycated hemoglobin A1c (HbA1c, a measure of average blood sugar), liver function tests, and urine protein testing (ideally a urinary albumin-to-creatinine ratio).

The European guideline places greater emphasis on detecting hypertension-mediated organ damage (HMOD)—harm that high blood pressure has already caused to organs like the heart, kidneys, and brain. Their guideline recommends considering echocardiography (ultrasound of the heart), carotid ultrasound, pulse wave velocity, and ankle-brachial index as additional tests to detect HMOD. The ACC/AHA lists an echocardiogram, uric acid, and urinary albumin-to-creatinine ratio as optional tests.

Assessing Your Heart Disease Risk

Both guidelines agree that assessing a patient's overall cardiovascular disease (CVD) risk is essential for making treatment decisions—it's not just about the blood pressure number itself. However, they use different tools and approaches.

The ACC/AHA approach is relatively straightforward:

• If a patient already has cardiovascular disease, they are automatically considered high risk
• For adults age 40–79 without CVD, risk is calculated using the Pooled Cohort Equations, which estimate the 10-year risk of atherosclerotic cardiovascular disease (ASCVD) events like heart attacks and strokes
• The risk calculator considers age, systolic and diastolic blood pressure, total cholesterol, HDL ("good") cholesterol, LDL ("bad") cholesterol, history of diabetes, current smoking status, and use of blood pressure medication, statins, or aspirin
• A 10-year risk of 10% or higher is considered high risk; below 10% is lower risk
• Patients with diabetes, chronic kidney disease, or age 65+, are automatically considered high risk
• For adults under 40, the guideline recommends estimating lifetime CVD risk

The ESC/ESH approach uses four risk categories. Adults with existing cardiovascular disease (including asymptomatic atherosclerosis found on imaging), type 1 or type 2 diabetes, very high individual risk factors (like grade 3 hypertension), or chronic kidney disease are considered high or very high risk (defined as 10-year CVD mortality of 5–10% and ≥10%, respectively). For everyone else, the guideline recommends using the Systematic Coronary Risk Evaluation (SCORE) system, which estimates the 10-year risk of a fatal cardiovascular event based on age, sex, total cholesterol (or total cholesterol/HDL ratio), smoking status, and systolic blood pressure.

The ESC/ESH guidelines also:

• Provide SCORE charts for both high-risk and low-risk European countries (15 national or regional versions are available)
• Include correction factors for ethnicity
• Emphasize the importance of HMOD in risk assessment
• Use a classification system that combines blood pressure levels, HMOD, other risk factors, and existing CVD to illustrate how risk multiplies when these factors combine

Both guidelines acknowledge that risk-estimating tools have limitations and can be challenging to use and interpret in everyday practice.

Lifestyle Changes: The Foundation of Treatment

High blood pressure in a large percentage of adults is linked to an unhealthy diet, lack of physical activity, and/or alcohol use. On this point, the two guidelines agree completely: lifestyle modification is the cornerstone of both prevention and treatment of hypertension.

The ACC/AHA guideline recommends:

• A healthy diet, especially the DASH diet (Dietary Approaches to Stop Hypertension)
• Weight loss for adults who are overweight or obese
• Reducing dietary sodium (salt)
• Increasing dietary potassium intake
• Regular physical activity
• Moderation of, or complete abstinence from, alcohol

The ESC/ESH guideline recommends the same core elements, but highlights the Mediterranean diet as the preferred healthy eating pattern. Both documents recognize that lifestyle change is often difficult, which is why both call on healthcare providers to give patients practical support and follow-up.

When to Start Blood Pressure Medication

This is where the two guidelines' differences in blood pressure thresholds translate into different treatment recommendations.

The ACC/AHA guideline recommends starting medication in all adults with blood pressure of 140/90 mm Hg or higher, regardless of their cardiovascular risk level. Additionally, it recommends medication for the approximately 30% of adults with blood pressure in the 130–139/80–89 range who are identified as high risk (based on the CVD risk assessment described above). This disproportionately affects older patients, since age is such a powerful and unchangeable risk factor.

The ESC/ESH guideline also recommends immediate drug therapy at 140/90 mm Hg or higher, but only for patients who are at high or very high risk due to existing cardiovascular disease, kidney disease, or HMOD. For patients at low or moderate risk, the European guideline recommends starting medication only if blood pressure is not controlled after 3 months of lifestyle intervention.

For the "high normal" range (130–139/85–89 mm Hg), the ESC/ESH recommends drug therapy may be considered only in patients with cardiovascular disease, especially coronary artery disease.

One important exception in the European guideline: adults over 80 years of age who have untreated hypertension should only be considered for blood pressure–lowering medication when their office systolic blood pressure is 160 mm Hg or higher.

What This Means for Patients

The practical takeaway from comparing these two guidelines is that the overall message is consistent: high blood pressure must be taken seriously, treated early, and managed persistently. Some key implications:

• If your blood pressure is 130–139/80–89 mm Hg, the American guideline considers you to have stage 1 hypertension, while the European guideline considers you to have "high normal" blood pressure. Both agree that this level warrants attention, particularly lifestyle changes.
• If your blood pressure is 140/90 mm Hg or higher, both guidelines agree you should be treated—the only question is whether medication begins immediately or after a short trial of lifestyle changes.
• Both guidelines strongly encourage home blood pressure monitoring and, where available, 24-hour ambulatory monitoring. This helps catch white coat and masked hypertension.
• Out-of-office readings that correspond to an office reading of 140/90 mm Hg are 135/85 mm Hg for home readings and daytime averages, and 130/80 mm Hg for 24-hour averages.

The authors note that the concordance between the two guidelines is greater than in previous generations of guidelines. They recommend that future guideline committees work to harmonize their recommendations even further, which would "underscore the commonality of their core recommendations and could serve to catalyze changes in practice that would lead to improved prevention, awareness, treatment, and control of hypertension, worldwide."

What These Guidelines Couldn't Determine

As with all medical guidelines, both documents have limitations that patients and clinicians should keep in mind:

• The NHANES-based prevalence estimates for the US likely overestimate true hypertension prevalence because blood pressure was measured on only a single occasion and was not confirmed with out-of-office readings.
• Both guidelines acknowledge challenges with the use and interpretation of CVD/ASCVD risk-estimating tools, which can limit their accuracy in individual patients.
• Both guidelines note the uncertainty in their treatment recommendations for white coat and masked hypertension.
• The guidelines recommend differing approaches to risk assessment (Pooled Cohort Equations vs. SCORE), which can lead to different risk classifications for the same patient depending on which system is used.

Recommendations for Patients

Based on the harmonized messages from both guidelines, patients can take the following practical steps:

1. Know your numbers. Have your blood pressure measured regularly with a validated device, and take readings both in the office and at home.
2. Get accurate readings. Sit quietly for several minutes before measurement, avoid caffeine and smoking beforehand, and use a properly sized cuff. Take at least 2–3 readings and record the average.
3. Adopt a heart-healthy diet. Whether you follow the DASH diet or the Mediterranean diet, the principles are the same: more fruits, vegetables, whole grains, and lean protein; less salt, saturated fat, and processed food.
4. Move more. Aim for regular physical activity, as recommended by your doctor.
5. Watch your weight. Weight loss is one of the most effective lifestyle interventions for lowering blood pressure.
6. Limit alcohol. Moderation or abstinence is recommended.
7. Ask about your overall risk. Ask your doctor to calculate your 10-year cardiovascular risk score and discuss what it means for your treatment plan.
8. Take medication as prescribed. If your doctor recommends blood pressure medication, take it consistently. Both guidelines agree that treating high blood pressure saves lives.

Frequently Asked Questions

What is the difference between the American and European blood pressure guidelines?

The main difference is the threshold for diagnosing hypertension. The American guideline uses 130/80 mm Hg, while the European guideline uses 140/90 mm Hg. Both agree on lifestyle changes and treating blood pressure of 140/90 or higher, but they differ on when to start medication for lower readings.

My blood pressure is often 135/85 mm Hg at home. What does that mean?

A home reading of 135/85 mm Hg corresponds roughly to an office reading of 140/90 mm Hg. Both guidelines consider this level hypertension. The American guideline would call it stage 1 hypertension; the European guideline would call it grade 1 hypertension. Lifestyle changes are recommended, and medication may be needed based on your overall risk.

What is white coat hypertension and why does it matter?

White coat hypertension means blood pressure is elevated in the doctor's office but normal at home. Both guidelines recommend confirming an office diagnosis with home or ambulatory monitoring to catch this condition. This helps avoid unnecessary treatment. If you have white coat hypertension, your doctor may monitor you closely rather than start medication immediately.

What tests will I need if I am being evaluated for high blood pressure?

Both guidelines recommend fasting blood glucose, kidney function tests (creatinine and eGFR), lipid profile, sodium and potassium, urinalysis, and an electrocardiogram (ECG). The American guideline also adds a complete blood count, calcium, and thyroid-stimulating hormone. The European guideline adds hemoglobin, uric acid, HbA1c, liver tests, and urine albumin-to-creatinine ratio.

When should I start taking blood pressure medication?

The American guideline recommends medication for all adults with blood pressure 140/90 or higher, and for those with 130–139/80–89 if they are at high risk. The European guideline recommends medication at 140/90 or higher for high-risk patients, and for lower-risk patients after 3 months of lifestyle changes. For adults over 80, European guidelines consider medication only when systolic is 160 or higher.

What lifestyle changes are most important for lowering blood pressure?

Both guidelines emphasize a healthy diet (DASH or Mediterranean), weight loss if overweight, reducing salt, increasing potassium, regular physical activity, and limiting alcohol. These are the foundation of both prevention and treatment. Even if you take medication, lifestyle changes remain important for controlling blood pressure and reducing cardiovascular risk.

How is my overall heart disease risk assessed?

The American guideline uses the Pooled Cohort Equations to estimate 10-year risk of heart attack or stroke for adults aged 40–79. The European guideline uses the SCORE system, which estimates 10-year risk of fatal cardiovascular events. Both consider existing heart disease, diabetes, kidney disease, and other risk factors. Ask your doctor to calculate your risk score and explain it to you.

Source Information

Original article title: Harmonization of the American College of

Authors: Paul K. Whelton, MB, MD, MSc; Robert M. Carey, MD; Giuseppe Mancia, MD; Reinhold Kreutz, MD; Joshua D. Bundy, PhD, MPH; Bryan Williams, MD

Publication: Circulation, September 13, 2022, Volume 146, pages 868–877. DOI: 10.1161/CIRCULATIONAHA.121.054602. The article was co-published with permission in the European Heart Journal, the Journal of the American College of Cardiology, and Circulation, and is available under a Creative Commons Attribution Non-Commercial License.

This patient-friendly article is based on peer-reviewed research. It is intended for educational purposes and should not replace advice from your healthcare provider. Discuss any questions about your blood pressure or treatment plan with your doctor.