D115 Unit 5: Hypertension and Cardiovascular Conditions Review

D115 Unit 5: Hypertension and Cardiovascular Conditions Review

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Western Governors University 

D115 Advanced Pathophysiology for the Advanced Practice Nurse

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Date

Hypertension

What is Hypertension?

Hypertension refers to a chronic condition where the systemic arterial blood pressure remains elevated persistently. Traditionally, hypertension was defined by systolic blood pressure readings of 140 mmHg or higher, or diastolic readings of 90 mmHg or higher, based on the 2014 clinical guidelines. However, newer evidence prompted a revision in 2017, lowering these diagnostic thresholds to systolic blood pressure of 130 mmHg or more and diastolic pressure of 80 mmHg or above. This change acknowledges the increased cardiovascular risk associated with even moderately elevated blood pressure levels (American College of Cardiology/American Heart Association Task Force, 2017; James et al., 2014).

What is the Epidemiology of Hypertension?

Hypertension is the most common primary diagnosis in the United States and affects a large portion of the adult population. Approximately 95% of hypertension cases are categorized as primary or essential hypertension, where no identifiable cause is found. The remaining 5% are cases of secondary hypertension, which result from specific medical conditions such as chronic kidney disease or endocrine disorders. This distinction is important because secondary hypertension can often be treated by addressing the underlying cause (Mayo Clinic, 2025).

What Types of Hypertension Exist?

Type	Characteristics	Cause	Outcome
Primary (Essential)	No specific identifiable cause; multifactorial	Combination of genetic predisposition and environmental factors	Leads to sustained elevation in vascular tone and blood volume, causing persistent hypertension
Secondary	Result of identifiable underlying disease	Often due to renal or endocrine abnormalities causing increased peripheral resistance or cardiac output	Potentially reversible if the underlying condition is treated early

Primary hypertension accounts for the majority of cases and develops due to complex interactions between inherited traits and lifestyle factors. In contrast, secondary hypertension is linked to specific, often treatable conditions (American College of Cardiology/American Heart Association Task Force, 2017).

What Are the Risk Factors for Primary Hypertension?

Risk factors contributing to primary hypertension can be grouped into three categories:

• Nonmodifiable: Includes increasing age, genetic predisposition, ethnicity, and family history.

• Socioeconomic and Behavioral: Factors such as low educational attainment, socioeconomic challenges, tobacco use, psychological stress, and obstructive sleep apnea.

• Dietary and Metabolic: High sodium and fat intake, obesity, and impaired glucose metabolism.

These risk factors also play a significant role in the development of cardiovascular diseases, emphasizing the need for early lifestyle interventions (James et al., 2014).

What is the Pathophysiology of Hypertension?

The underlying mechanism of hypertension involves either an increase in cardiac output, an increase in total peripheral vascular resistance, or a combination of both. Prolonged elevated blood pressure can lead to progressive damage to critical organs including the heart, kidneys, brain, and blood vessels (American College of Cardiology/American Heart Association Task Force, 2017).

What are the Clinical Manifestations of Hypertension?

Often termed the “silent killer,” hypertension may initially present without symptoms. When organ damage occurs, clinical signs such as coronary artery disease, heart failure, renal impairment, stroke, cognitive decline, vision problems, peripheral edema, or vascular occlusion might develop (Mayo Clinic, 2025).

How is Hypertension Diagnosed?

Accurate diagnosis requires multiple blood pressure measurements on at least two separate visits. Each visit should include at least two readings spaced by two minutes. Measurements must follow strict protocols: patients should be seated comfortably with their arm supported at heart level, rested for at least five minutes, and abstain from caffeine, exercise, or smoking beforehand (James et al., 2014).

How is Hypertension Managed?

Management strategies focus on both non-pharmacologic and pharmacologic approaches. Lifestyle modifications such as dietary changes (e.g., DASH diet), regular physical activity, weight loss, stress management, and tobacco cessation are foundational. Drug therapy is introduced based on blood pressure severity and patient-specific risk factors, following contemporary guidelines (American College of Cardiology/American Heart Association Task Force, 2017).

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Metabolic Syndrome

What is Metabolic Syndrome?

Metabolic syndrome is a cluster of interconnected metabolic abnormalities that significantly increase the risk for type 2 diabetes mellitus and cardiovascular disease. It reflects an underlying pathophysiologic process involving insulin resistance, central adiposity, and lipid abnormalities (National Heart, Lung, and Blood Institute, 2025).

What are the Components of Metabolic Syndrome?

Component	Description
Central (abdominal) obesity	Excess fat accumulation around the abdomen
Dyslipidemia	Abnormal lipid levels, including elevated triglycerides and low HDL cholesterol
Prehypertension	Elevated blood pressure that is not yet in the hypertensive range
Elevated fasting blood glucose	Higher than normal blood sugar levels indicating insulin resistance

These components collectively increase cardiovascular risk beyond the sum of individual factors (National Heart, Lung, and Blood Institute, 2025).

What is the Epidemiology of Metabolic Syndrome?

Metabolic syndrome can develop early in life and is increasingly prevalent among sedentary adults and overweight children and adolescents. This early onset highlights the critical importance of prompt identification and intervention to prevent progression to diabetes and cardiovascular events (National Heart, Lung, and Blood Institute, 2025).

How is Metabolic Syndrome Managed?

Management prioritizes early screening and aggressive lifestyle interventions aimed at weight reduction, nutritional optimization, and enhancing physical activity. Such measures can mitigate risks and improve long-term outcomes (National Heart, Lung, and Blood Institute, 2025).

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Deep Vein Thrombosis (DVT)

What is Deep Vein Thrombosis?

Deep vein thrombosis is a condition where a blood clot forms in the deep veins, most commonly in the lower extremities. The thrombus remains attached to the vein wall, posing a risk for embolization (Kahn et al., 2024).

What are the Risk Factors for DVT?

Risk Factor
Hospitalization
Trauma
Orthopedic surgery
Age over 60
Pregnancy
Malignancy
Inherited thrombophilias (e.g., Factor V Leiden mutation)

These factors contribute to the development of venous thromboembolism through mechanisms such as immobilization, vascular injury, or hypercoagulability (Kahn et al., 2024).

What is the Pathophysiology of DVT?

DVT arises due to the interplay of Virchow’s triad: venous stasis, endothelial damage, and a hypercoagulable state. These conditions favor clot formation, particularly near venous valves where blood flow is slower (Kahn et al., 2024).

What are the Clinical Manifestations of DVT?

Patients with DVT may be asymptomatic or exhibit signs such as unilateral limb pain, swelling, dilated superficial veins, and skin discoloration. Early recognition is vital to prevent complications (Kahn et al., 2024).

How is DVT Diagnosed?

Initial screening often involves a D-dimer blood test, which is highly sensitive but not specific. Confirmation is typically achieved through compression Doppler ultrasound, the diagnostic standard (Kahn et al., 2024).

What are the Prevention and Treatment Strategies for DVT?

Prevention includes early mobilization after surgery or hospitalization and the use of mechanical devices like compression stockings. Treatment primarily involves anticoagulation therapy tailored to patient risk and clinical scenario (Kahn et al., 2024).

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Angina Pectoris

What is Angina Pectoris?

Angina pectoris is chest discomfort or pain caused by myocardial ischemia due to reduced blood flow in coronary arteries.

What Types of Angina Exist?

Type	Description	Clinical Features	Treatment
Stable Angina	Predictable pain with exertion	Relieved by rest; no myocardial necrosis	Lifestyle changes, nitrates
Unstable Angina	Occurs unpredictably, often at rest or increasing frequency	Associated with plaque rupture; high risk of myocardial infarction	Requires urgent medical intervention
Prinzmetal (Variant) Angina	Caused by coronary artery spasm	Occurs at rest, frequently nocturnal	Calcium channel blockers, nitrates

Each angina type has distinct pathophysiology and clinical management approaches (Mayo Clinic, 2025).

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Heart Failure

What is Heart Failure?

Heart failure occurs when the heart cannot pump sufficient blood to meet the body’s needs or maintain adequate filling pressures.

What are the Types of Heart Failure?

Type	Features
Left-sided Systolic (HFrEF)	Reduced ejection fraction (<40%), impaired contractility
Left-sided Diastolic (HFpEF)	Preserved ejection fraction, impaired relaxation
Right-sided Heart Failure	Usually secondary to left-sided failure; leads to systemic venous congestion

Understanding the type of heart failure guides therapeutic decisions (Mayo Clinic, 2025).

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Cardiogenic Shock

What is Cardiogenic Shock?

Cardiogenic shock is a life-threatening state in which the heart fails to pump sufficient blood despite adequate filling pressures, resulting in hypotension and inadequate tissue perfusion.

What are the Clinical Features of Cardiogenic Shock?

Clinical manifestations include low blood pressure, rapid heartbeat, difficulty breathing, and signs of organ dysfunction or failure due to hypoperfusion (Mayo Clinic, 2025).

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Hypoplastic Left Heart Syndrome (HLHS)

What is HLHS?

HLHS is a severe congenital defect characterized by underdevelopment of the left heart structures, which impairs systemic blood flow.

How Does HLHS Present?

Newborns with HLHS may appear normal initially but rapidly deteriorate when the ductus arteriosus closes, leading to critical circulatory failure.

How is HLHS Managed?

Management includes continuous prostaglandin infusion to maintain ductal patency and a series of staged surgeries (Norwood, Glenn, Fontan) to palliate the defect (Mayo Clinic, 2025).

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Hematologic Disorders

What are Some Key Hematologic Disorders?

Disorder	Description	Key Features
Sickle Cell Disease	Autosomal recessive disorder causing abnormal hemoglobin	Chronic vaso-occlusion and hemolysis leading to organ damage
Disseminated Intravascular Coagulation (DIC)	Systemic activation of coagulation and fibrinolysis	Simultaneous bleeding and thrombosis
Pernicious Anemia	Vitamin B12 deficiency due to intrinsic factor loss	Megaloblastic anemia with neurologic symptoms
Iron Deficiency Anemia	Most common anemia worldwide due to blood loss or poor intake	Microcytic, hypochromic RBCs

What Are Leukemias?

Type	Characteristics	Common Demographics
Acute Leukemias	Rapid proliferation of immature blasts	ALL common in children; AML in adults
Chronic Leukemias	Involvement of more mature cells	CLL marked by smudge cells and immune dysfunction

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Myocardial Infarction

What is a Myocardial Infarction?

A myocardial infarction (MI) results from prolonged ischemia causing irreversible myocardial cell death.

What are the Types of MI?

Type	Description
STEMI	Transmural infarction involving full thickness of myocardium
NSTEMI	Subendocardial infarction affecting inner myocardial layers

How is MI Diagnosed?

Diagnosis is confirmed by elevated cardiac biomarkers, especially troponins, and characteristic electrocardiographic (ECG) changes (American College of Cardiology/American Heart Association Task Force, 2017).

What is the Management of MI?

Treatment includes prompt reperfusion via percutaneous coronary intervention (PCI) or thrombolytics. Antiplatelet and anticoagulant medications are standard, along with long-term management to modify cardiovascular risk factors (American College of Cardiology/American Heart Association Task Force, 2017).

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Neurologic Disorders

What are Important Concepts in Neurologic Disorders?

Cerebral perfusion pressure (CPP) is calculated as mean arterial pressure (MAP) minus intracranial pressure (ICP). Elevated ICP reduces cerebral blood flow, potentially causing brain injury. Damage to the brainstem affects consciousness and autonomic vital functions (Mayo Clinic, 2025).

What Are Major Neurologic Conditions?

Key neurologic disorders include locked-in syndrome, subarachnoid hemorrhage, spinal cord injury complicated by autonomic dysreflexia, cerebral edema with herniation, seizures, epilepsy, delirium, and dementia.

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References

American College of Cardiology/American Heart Association Task Force. (2017). 2017 ACC/AHA guideline for the prevention, detection, evaluation, and management of high blood pressure in adults. Journal of the American College of Cardiology, 71(19), e127-e248.

James, P. A., Oparil, S., Carter, B. L., Cushman, W. C., Dennison-Himmelfarb, C., Handler, J., … & Ortiz, E. (2014). 2014 evidence-based guideline for the management of high blood pressure in adults. JAMA, 311(5), 507-520.

Kahn, S. R., et al. (2024). Deep vein thrombosis and pulmonary embolism. The Lancet, 393(10172), 1839-1852.

Mayo Clinic. (2025). Hypertension (high blood pressure). https://www.mayoclinic.org/diseases-conditions/high-blood-pressure

National Heart, Lung, and Blood Institute. (2025). What is metabolic syndrome? https://www.nhlbi.nih.gov/health-topics/metabolic-syndrome