540 Week 4 May 21 Cardio Hypertension Notes

Prevalence and Impact of Hypertension

• Systolic pressure typically increases with age.

• Diastolic pressure usually increases until around age 60, then decreases, leading to a wider pulse pressure.

Pulse Pressure Explained

• Definition: Pulse pressure is the difference between systolic and diastolic blood pressure.

• Normal Pulse Pressure: Ideally around 40 mmHg (e.g., 120/80 mmHg).

  • $120 - 80 = 40$

• Wide Pulse Pressure: A pulse pressure significantly higher than normal indicates increased risk.

  • Example: 160/60 mmHg has a pulse pressure of 100 mmHg, indicating higher risk.

    • $160 - 60 = 100$

  • Example: 140/100 mmHg has a pulse pressure of 40 mmHg.

    • $140 - 100 = 40$

• Significance: Higher pulse pressure, especially in older patients (whose diastolic pressures tend to decrease), correlates with increased risk of health issues.

Complications of Hypertension

• Hypertension can lead to various complications:

  • Retinopathy (eye damage)

  • Nephropathy (kidney damage)

  • Peripheral artery disease

  • Stroke

  • Heart disease

• Early intervention and management are crucial.

Challenges in Hypertension Management

• Hypertension often goes untreated because:

  • Many patients are asymptomatic.

  • Some patients don't seek medical care.

• Effective management requires:

  • Continuity of care: Regular follow-up appointments (monthly, every 3-6 months, or annually).

  • Patient education: Guidance on diet, exercise, and lifestyle modifications.

Types of Hypertension

• Primary Hypertension: Most common type, often seen in everyday practice.

• Secondary Hypertension: Caused by another underlying condition.

  • Most common cause of secondary hypertension is renal (kidney-related) issues.

  • Consider renal causes if a patient doesn't have primary hypertension after initial workup.

• White Coat Hypertension: Elevated blood pressure readings in a clinical setting due to anxiety.

Primary Hypertension Details

• Increasingly prevalent in younger populations (25-50 years old).

• More common in African American adults.

• Genetic component: Individuals with parents who have hypertension are twice as likely to develop it.

• High salt intake: Americans consume an average of 3600 mg of salt daily, exceeding the recommended 1500 mg.

Other Causes of Secondary Hypertension

• Renal issues are the most common cause.

• Other causes will be discussed in detail later.

White Coat Hypertension Management

• Characterized by elevated blood pressure in clinical settings (above 140/90 mmHg) but normal readings at home.

• Diagnosis involves:

  • Ruling out other causes.

  • Using an ambulatory blood pressure monitor for 24-hour monitoring to get accurate readings.

Screening for Hypertension

• Screening should start at age 18, at least annually.

• Blood pressure checks are commonly performed during routine doctor visits.

Methods for Checking Blood Pressure

• Manual Measurement: Generally considered more accurate in-office reading.

• Ambulatory Blood Pressure Monitoring: Gold standard for out-of-office assessment.

• Home Blood Pressure Machines: Useful, but ambulatory monitoring is preferred for accuracy.

• Important Considerations:

  • Use appropriately sized cuffs for accurate readings.

  • Ensure proper patient positioning during measurement (sitting for a few minutes with correct arm placement).

Diagnosing Hypertension

• Diagnosis requires an average of two or more elevated readings.

• Process:

  • If initial reading is abnormal, advise the patient to monitor blood pressure at home and return for a recheck.

  • Treatment is considered if blood pressure remains high.

• Exceptions:

  • Immediate action is required if blood pressure is very high (e.g., 160/100 mmHg or higher) or if the patient is experiencing a hypertensive emergency (e.g., severe headache, vision changes).

Blood Pressure Classifications (American Heart Association)

• Normal: Systolic less than 120 mmHg AND Diastolic less than 80 mmHg.

• Elevated: Systolic 120-129 mmHg AND Diastolic less than 80 mmHg.

• Stage 1 Hypertension: Systolic 130-139 mmHg OR Diastolic 80-89 mmHg.

• Stage 2 Hypertension: Systolic 140 mmHg or higher OR Diastolic 90 mmHg or higher.

• Key Rule: If systolic and diastolic values fall into different categories, classify the patient based on the higher stage.

  • Example: A patient with 120/89 mmHg is classified as Stage 1 hypertension because the diastolic reading (89 mmHg) is in the Stage 1 range, even though the systolic reading (120 mmHg) is in the Elevated range.