Impact of Cardiovascular Risk Factor Profiles on Blood Pressure Control Rates in Adults
Canada & United States

Background

Hypertension remains a leading modifiable risk factor for cardiovascular disease (CVD) in North America. Although national guidelines for blood pressure (BP) management are similar in Canada and the United States, reported control rates differ considerably. A growing body of evidence suggests that the distribution of coexisting cardiovascular risk factorssuch as obesity, dyslipidemia, diabetes, smoking, and physical inactivitymodifies the likelihood of achieving target BP. Understanding how these riskfactor profiles influence control is essential for tailoring publichealth strategies and clinical care.

Key Cardiovascular Risk Factors

The major riskfactor clusters most frequently examined in population surveys include:

• Obesity (BMI 30kg/m) prevalence ~30% in the U.S. and ~28% in Canada.
• Type2 Diabetes Mellitus 1012% of adults.
• Elevated LDLC (130mg/dL) often coexists with hypertension.
• Current smoking 15% (U.S.) versus 13% (Canada).
• Physical inactivity measured as <10min of moderate activity per week.

When these factors accumulate, they create a highrisk phenotype that challenges BP control.

Data Sources and Definitions

Recent analyses have drawn on two large, crosssectional surveys:

• U.S. National Health and Nutrition Examination Survey (NHANES) 20172020.
• Canadian Community Health Survey (CCHS) Healthy Minds 20182021.

Hypertension was defined as systolic BP 140mmHg or diastolic BP 90mmHg, or use of antihypertensive medication. BP control was defined as <130/80mmHg, reflecting the 2021 ACC/AHA and 2020 Canadian Hypertension Education Program targets.

Control Rates by RiskFactor Profile

Overall control rates differed markedly:

• United States: 44% of hypertensive adults achieved <130/80mmHg.
• Canada: 58% achieved the same target.

When stratified by the number of additional risk factors present, a clear gradient emerged (Table1).

Adults with four or more risk factors were less than onethird as likely to be controlled compared with those having none or one.

Mechanisms Linking Risk Factors to Poor Control

1. Obesityrelated sodium retention and activation of the reninangiotensinaldosterone system amplify volumedependent hypertension.
2. Insulin resistance increases sympathetic tone and impairs vasodilatory pathways.
3. Dyslipidemia promotes endothelial dysfunction, diminishing nitricoxidemediated vasorelaxation.
4. Smoking causes acute vasoconstriction and chronic arterial stiffness.
5. Physical inactivity reduces arterial compliance and worsens weight gain, creating a feedback loop.

These physiological interactions often require more intensive pharmacologic regimens and lifestyle modification to achieve control.

Comparative Insights Between Canada and the United States

Several factors may explain the higher Canadian control rates:

• Universal healthcare access facilitates regular followup and medication adherence.
• National dietary guidelines emphasize reduced sodium intake, with more aggressive publicpolicy implementation.
• Greater use of fixeddose combination pills in primarycare settings.

Conversely, the United States faces disparities related to insurance coverage, medication cost, and varying guideline adoption across health systems.

Implications for Practice and Policy

To improve BP control among highrisk profiles, the following actions are recommended:

1. Riskfactor clustering screening at each hypertension visit, using a simple checklist.
2. Early initiation of combination therapy for patients with 2 additional risk factors.
3. Intensive lifestyle programmes that address diet, physical activity, and smoking simultaneously.
4. Enhanced medication affordability through generic prescribing and subsidy programs.
5. Communitybased sodium reduction policieslabeling, foodservice guidelines, and public education.

Targeted interventions are likely to narrow the control gap between the two countries and reduce CVD morbidity.

Conclusion

Cardiovascular riskfactor profiles exert a powerful influence on bloodpressure control among adults in Canada and the United States. The presence of multiple coexisting risk factors dramatically lowers the odds of achieving guidelinerecommended targets, while systemic differences in healthcare delivery contribute to the observed national disparity in control rates. Integrated clinical strategies that address both pharmacologic intensity and lifestyle modification, coupled with policies that improve access to care, are essential for closing the control gap and mitigating the burden of hypertensionrelated disease.