Drugs Used to Treat Hypertension

Drugs Used to Treat Hypertension

Understanding Hypertension

  • Definition: Characterized by elevated systolic blood pressure (SBP), diastolic blood pressure (DBP), or both.

  • Types:

  • Primary Hypertension: Accounts for about 90% of cases; no identifiable cause.

  • Secondary Hypertension: Occurs due to another underlying disorder.

Measurement of Blood Pressure

  • Systolic Blood Pressure: Pressure in arteries when heart beats.

  • Diastolic Blood Pressure: Pressure when heart muscle relaxes.

  • Pulse Pressure: Difference between systolic and diastolic pressures.

  • Mean Arterial Pressure (MAP): Average arterial pressure during one cardiac cycle.

Major Risk Factors for Hypertension

  • Lifestyle & Health Factors:

  • Cigarette smoking

  • Obesity

  • Physical inactivity

  • Dyslipidemia

  • Diabetes mellitus

  • Microalbuminuria

  • Increased age (>55 men, >65 women)

  • Family history of cardiovascular diseases.

Classification of Blood Pressure (BP) for Adults

  • Normal: <120 systolic and <80 diastolic

  • Elevated: 120-129 systolic and <80 diastolic

  • Stage 1 Hypertension: 130-139 systolic and 80-89 diastolic

  • Stage 2 Hypertension: ≥140 systolic and ≥90 diastolic.

+++++++++++++++++++++++++++++++++++++++++++++++Identifiable Causes of Secondary Hypertension

  • Medical Conditions:

    • Sleep apnea

    • Chronic kidney disease

    • Renovascular disease

    • Primary aldosteronism

    • Cushing syndrome

    • Coarctation of the aorta

    • Thyroid or parathyroid disease

    • Drug-induced causes.

Treatment Goals for Hypertension

  • Objective: Reduce the frequency of cardiovascular disease by maintaining BP below 130/80 mm Hg in adults.

  • Dietary Recommendations: Adoption of the DASH diet (Dietary Approaches to Stop Hypertension).

Lifestyle Modifications for Hypertension Management

  • Recommended Changes:

  • Weight reduction

  • Healthy eating plan

  • Dietary sodium reduction

  • Regular physical activity

  • Moderation in alcohol consumption.

Nursing Assessments for Patients with Hypertension

  • Assessment Areas:

  • History of risk factors (smoking, dietary habits, medication history, etc.)

  • Physical measurements (2 BP readings, height, weight, peripheral pulses).

Patient Education on Hypertension

  • Key Topics:

  • Baseline and diagnostic studies

  • Nutritional habits & stress management

  • Importance of exercise and medication adherence

  • Awareness of side effects and monitoring needs.

Overview of Drug Therapy for Hypertension

  • Goal: Individualize therapy based on patient-specific factors, including concurrent conditions (e.g., heart failure, kidney disease).

Common Drug Classes Used:

Diuretics

  • Action: Deplete volume, induce vasodilation.

  • Usage: Often first-line treatment, used with other agents.

    Beta-Adrenergic Blocking Agents

  • Action: Inhibit cardiac response, lower heart rate.

  • Common Adverse Effects: Bradycardia, heart failure, bronchospasm.

    ACE Inhibitors

  • Action: Convert angiotensin I to angiotensin II blockage.

  • Adverse Effects: Cough, hypotension, renal impairment.

    Angiotensin II Receptor Blockers (ARBs)

  • Action: Block vasoconstrictor effects of angiotensin II.

  • Side Effects: Moderate to severe side effects; monitor potassium levels.

    Calcium Channel Blockers

  • Action: Prevent calcium ion movement, inducing vasodilation.

  • Side Effects: Monitor for hypotension and edema.

    Direct Vasodilators

  • Action: Relax arterial smooth muscle.

  • Usage: Manage advanced hypertension.

Nursing Considerations for Medication Administration

  • Evaluate BP and heart rate before administering specific classes (e.g., hold beta-blocker if systolic BP <100).

  • Provide patient education to mitigate adverse effects and encourage compliance.

Conclusion

  • Management of hypertension encompasses lifestyle modifications alongside pharmacological interventions. Regular monitoring and individualized care plans are crucial for effective treatment outcomes.