cardiovascular disease

cardiovascular disease
Name	Cardiovascular disease
Caption	Diagram of the human heart showing blood flow.
Field	Cardiology
Symptoms	Chest pain, shortness of breath, fatigue
Complications	Heart attack, stroke, heart failure
Duration	Chronic
Causes	Atherosclerosis, hypertension, smoking, diabetes
Risks	High blood pressure, high cholesterol, obesity
Diagnosis	Electrocardiogram, echocardiogram, blood test
Prevention	Healthy diet, physical activity, not smoking
Treatment	Medication, angioplasty, coronary artery bypass surgery
Medication	Statins, beta blockers, ACE inhibitors
Prognosis	Varies by condition
Frequency	Leading cause of death globally
Deaths	~17.9 million per year

cardiovascular disease is a class of diseases that involve the heart or blood vessels. It encompasses conditions such as coronary artery disease, cerebrovascular disease, and peripheral artery disease, which are often caused by atherosclerosis. These disorders are a leading cause of morbidity and mortality worldwide, placing a significant burden on healthcare systems like the National Health Service and the World Health Organization.

Definition and classification

Cardiovascular disease is broadly defined as any disease affecting the cardiovascular system. The primary classifications include diseases of the cardiac muscle and valves, such as cardiomyopathy and rheumatic heart disease, and diseases of the vasculature. Major vascular conditions are coronary artery disease, which can lead to myocardial infarction, and cerebrovascular disease, which can result in ischemic stroke or hemorrhagic stroke. Other classifications encompass congenital heart defects, seen in conditions like tetralogy of Fallot, and inflammatory conditions like Kawasaki disease and endocarditis.

Risk factors and causes

The development of this disease is strongly influenced by modifiable and non-modifiable risk factors. Key non-modifiable factors include age, sex, and family history, with genetic predispositions studied in projects like the Framingham Heart Study. Major modifiable risk factors are hypertension, hyperlipidemia, diabetes mellitus, and tobacco smoking. Behavioral risks include physical inactivity, unhealthy diets high in saturated fat, and excessive alcohol consumption. Socioeconomic factors and environmental stressors, documented by agencies like the Centers for Disease Control and Prevention, also contribute significantly to global burden.

Pathophysiology

The fundamental pathological process for many vascular diseases is atherosclerosis, a chronic inflammatory condition of the arterial wall. This involves the accumulation of low-density lipoprotein cholesterol within the intima, leading to the formation of a fibrous plaque. Rupture of this plaque can trigger thrombosis, acutely blocking blood flow, as seen in an acute coronary syndrome. In the heart, this can cause myocardial ischemia and necrosis. In hypertension, sustained high pressure leads to left ventricular hypertrophy and vascular remodeling, while conditions like atrial fibrillation disrupt normal electrical conduction, increasing the risk of thromboembolism.

Diagnosis and screening

Diagnosis relies on a combination of patient history, physical examination, and diagnostic testing. Common initial tests include the electrocardiogram to assess heart rhythm and the echocardiogram to evaluate cardiac structure and function. For coronary assessment, coronary angiography performed at institutions like the Cleveland Clinic is the gold standard. Blood tests measure biomarkers such as troponin and brain natriuretic peptide. Screening programs, endorsed by the U.S. Preventive Services Task Force, often focus on measuring blood pressure, cholesterol levels, and assessing risk via tools like the ASCVD Risk Calculator.

Management and treatment

Management strategies are tailored to the specific condition and severity. Pharmacological therapy is cornerstone, utilizing antiplatelet drugs like aspirin, statins such as atorvastatin, antihypertensive drugs including lisinopril, and anticoagulants like warfarin. For acute events, percutaneous coronary intervention with stent placement or thrombolytic therapy may be used. Surgical options include coronary artery bypass grafting, often performed at centers like the Texas Heart Institute, and valve replacement surgery. Lifestyle modification through programs like the DASH diet and cardiac rehabilitation are critical components of long-term care.

Epidemiology

It remains the leading cause of death globally, accounting for an estimated 17.9 million deaths annually according to the World Health Organization. Geographic disparities are significant, with high mortality rates observed in regions of Eastern Europe and Central Asia. In the United States, it is responsible for approximately one in every four deaths, as reported by the American Heart Association. The economic burden is immense, with costs projected to exceed $1 trillion in the U.S. by 2035. Global initiatives, such as the WHO Global Hearts Initiative, aim to reduce premature mortality from non-communicable diseases through improved prevention and treatment access.

Category:Cardiovascular diseases