cardiovascular

Introduction to Cardiovascular Disease

  • Speaker: Aaron Conway

  • Recognizes contributions from Doctor Karen Theobald and clinical partners at Royal Brisbane Hospital and PA Hospital.

  • Emphasizes importance of shared insights on optimizing outcomes for stroke patients.

  • Topics covered: hypertension, stroke, peripheral vascular disease.

Hypertension

Definition

  • Medical term: high blood pressure over a long period (hypertension).

  • Serious health problems linked: heart attacks, myocardial infarctions, stroke, heart failure, kidney disease.

  • Specifically, it's the force exerted by circulating blood against arterial walls.

Diagnosis

  • Hypertension is classified when:

    • Systolic Blood Pressure (SBP) ≥ 140 mmHg

    • Diastolic Blood Pressure (DBP) ≥ 90 mmHg

    • Must be measured over multiple occasions.

    • Alternative definition: Patient is on antihypertensive medication.

Classification

  • Primary Hypertension:

    • Most common type (90-95% cases).

    • No identifiable cause.

    • Contributing factors include:

    • Increased sympathetic nervous system activity.

    • Overproduction of sodium-retaining hormones and vasoconstrictors.

    • Increased sodium intake.

    • Comorbidities: overweight, diabetes, excessive alcohol, tobacco use.

  • Secondary Hypertension:

    • Known cause that can be treated and potentially reversed.

    • Less common (5-10% cases). Common causes include:

    • Coarctation of the aorta.

    • Liver cirrhosis.

    • Kidney disorders.

    • Endocrine disorders.

    • Neurological disorders.

    • Sleep apnea.

    • Pregnancy-induced hypertension.

Implications of Hypertension

  • Affects cardiovascular system leading to:

    • Stress on organs (e.g., kidneys, brain).

    • Development of cardiovascular diseases: coronary artery disease, stroke, etc.

  • Raises morbidity and mortality rates globally.

  • Increased healthcare costs due to complications and medication needs.

Statistics

  • 2017-2018 Stats:

    • 34% of adults in Australia had high blood pressure.

    • Uncontrolled hypertension prevalent.

    • Gender disparities: 1 in 4 men; 1 in 5 women.

    • Indigenous Australians have higher hypertension rates compared to non-Indigenous individuals.

Risk Factors for Primary Hypertension

  • Personal or family history of early cardiovascular disease.

  • Increasing age.

  • Gender: Males at higher risk.

  • Lifestyle factors:

    • Smoking.

    • Obesity.

    • Uncontrolled cholesterol.

    • Diabetes.

    • Excessive alcohol consumption, sedentary lifestyle, stress or mood disorders.

Pathophysiology and Mechanisms

  • Hypertension relates to cardiac output and systemic vascular resistance.

  • Increased arterial pressure arises from:

    • Increased cardiac output.

    • Increased systemic vascular resistance.

  • Mechanism involves:

    • Smooth muscle contraction induced by intracellular calcium.

    • Leads to structural changes (stiffening) in the arterial walls.

Medications for Hypertension

  • Calcium Channel Blockers:

    • Target increased systemic vascular resistance.

  • ACE Inhibitors:

    • Act within the renin-angiotensin-aldosterone system (RAS).

Interventions

  • Both pharmacological and non-pharmacological interventions:

    • Importance of managing hypertension to prevent complications.

    • Medication adherence and lifestyle modifications are crucial components:

    • Education on blood pressure monitoring.

    • Advice on modifications: exercise, diet, reducing alcohol intake, smoking cessation, and weight management.

Monitoring and Patient Education

  • Regular monitoring of blood pressure to tailor interventions.

  • Understanding individual barriers to lifestyle modification enhancing overall health.

Policy Development in Australia

  • National health policy focuses on hypertension management due to its prevalence and associated costs.

  • Objectives for hypertension control by 2030:

    • Doubling the control rate.

    • Emphasizing adherence to clinical guidelines and reducing salt/sugar intake.

    • Supporting smoking cessation initiatives.

    • Encouraging increased fiber intake and reduced alcohol consumption.

    • Improving access to physical activity infrastructure.

    • Provision of affordable validated blood pressure devices to enhance monitoring.

    • Promoting research and evidence-based practices.

Transition to Stroke Management

  • Following the overview of hypertension, the next topics will cover stroke diagnosis and management, followed by peripheral arterial disease.