Cardiology

Cardiology is the study of the heart. It comes from an old word for heart, "kardiā," and a word meaning "study." This area of medicine looks at problems with the heart and the blood vessels that carry blood throughout the body. It is a special part of internal medicine, which means doctors who focus on keeping the inside of the body healthy.

People who work in cardiology are called cardiologists. They help diagnose and treat many heart problems, such as heart defects that children are born with, blockages in the blood vessels of the heart, and problems with the heart not working well. Some doctors even specialize in helping children with heart problems; these doctors are called pediatric cardiologists. There are also surgeons who focus on operating on the heart and chest; these specialists are known as cardiothoracic surgeons. All of these experts work to keep hearts healthy and functioning properly.

Ancient Greek cardiovascular system internal medicine medical diagnosis congenital heart defects coronary artery disease heart failure valvular heart disease electrophysiology Physicians pediatricians cardiothoracic surgeons general surgery

Specializations

Cardiologists study problems with the heart, but they have different types of training depending on whether they focus on adults or children. Adult cardiologists aren’t trained to care for children, and pediatric cardiologists aren’t trained to treat adult heart problems. Some heart surgeries, like coronary artery bypass or valve replacement, are done by surgeons, not cardiologists. However, cardiologists can perform many procedures without surgery, such as checking the heart with catheters, fixing heart valves, and placing devices to help the heart’s rhythm.

In the United States, becoming a cardiologist requires three years of training after medical school in internal medicine, followed by three more years in cardiology. Doctors can then choose to specialize further in areas like heart rhythm problems or imaging the heart. In the United Kingdom, doctors need two years of general training, three years in internal medicine, and then five years in cardiology training. In India, it takes about 11.5 years after high school to become a cardiologist, including medical school and additional specialized training.

The heart

Main article: Heart

The heart is the main focus of cardiology. It has many parts, like the atria and ventricles, and it works in many ways, such as pumping blood and making heart sounds. The heart sits in the middle of your body, slightly to the left. Its main job is to pump blood to all parts of the body. It sends blood to the lungs to get oxygen and then pumps it back out.

When the heart has problems, it can cause heart disease, which is a common reason people get very sick. The heart works like a pump, moving blood through your body. It has both electrical and mechanical parts. The electrical part helps the heart’s muscle squeeze at the right time, and the mechanical part moves the blood. If either part stops working well, it can cause serious health issues.

Coronary circulation is the blood flow in the heart’s own blood vessels. These vessels bring oxygen-rich blood to the heart muscle and take away blood that has less oxygen. If these vessels get blocked, it can cause chest pain or a heart attack.

The cardiac examination is a way doctors check the heart as part of a regular health check or when someone has chest pain. Doctors look, feel, and listen to the heart to see how it’s working.

Heart disorders

Main article: List of heart disorders

Cardiology studies how the heart works normally and when it doesn't. The heart and the blood vessels work together as the cardiovascular system, and problems in one often affect the other.

Coronary artery disease

Main article: Coronary artery disease

Coronary artery disease is a common heart problem. It can cause chest pain, shortness of breath, or even a heart attack. It happens when the arteries to the heart get narrow. Things that increase the risk include high blood pressure, smoking, diabetes, and not exercising. Doctors can help with tests and treatments to manage this disease.

Cardiomyopathy

Main article: Cardiomyopathy

Cardiomyopathy means the heart muscle isn't working well. It can be caused by genetics, viruses, or lifestyle choices. Symptoms include shortness of breath and feeling tired. Understanding how the heart muscle works is important for treating this condition.

Cardiac arrhythmia

Main article: Arrhythmia

Cardiac arrhythmia is when the heart's rhythm is too fast, too slow, or irregular. This might feel like fluttering in the chest or even fainting. While many types are harmless, some can lead to serious issues. Doctors have ways to diagnose and treat arrhythmias.

Cardiac arrest

Main article: Cardiac arrest

Cardiac arrest is when the heart suddenly stops working. This can happen due to heart problems or other serious conditions. It's a medical emergency that needs immediate help to save the person's life.

Hypertension

Main article: Hypertension

Hypertension, or high blood pressure, is when the blood pushes too hard against the artery walls. It often doesn't cause symptoms but can lead to serious health issues like heart disease or stroke. Changing lifestyle habits and medications can help lower blood pressure.

Congenital heart defects

Main article: Congenital heart defect

Congenital heart defects are problems with the heart present at birth. Symptoms can range from none to very serious. These defects might need medical treatment or surgery. They are the most common type of birth defect and can sometimes be prevented through vaccinations and nutrition.

Diagnostic tests in cardiology

Main article: Diagnostic tests in cardiology

Diagnostic tests in cardiology help doctors find out if someone’s heart is healthy or has problems. First, doctors talk to the patient to get a medical history and then listen to the heart with a special tool. After that, they might do blood tests or use special imaging to look at the heart. Some tests check how the heart’s electricity works, like an electrocardiogram, monitoring the heart over time, or testing the heart during exercise.

Trials

Cardiology uses special tests called randomized controlled trials to find the best ways to treat heart problems. Many of these tests are done every year, but some are very important because they change how doctors treat heart disease. These important tests often have short names, and doctors use these names when talking about the results.

Some of these key tests include:

• V-HeFT (1986) — using certain medicines for heart failure
• ISIS-2 (1988) — using aspirin for heart attacks
• CAST (1991) — using special medicines after a heart attack can be harmful
• SOLVD (1991) — using ACE inhibitors for heart failure
• 4S (1994) — statins can lower the risk of heart disease
• CURE (1991) — using two types of blood-thinning medicine for a certain kind of heart attack
• MIRACLE (2002) — using a special therapy for heart failure
• SCD-HeFT (2005) — using a small device to help with heart failure
• RELY (2009), ROCKET-AF (2011), ARISTOTLE (2011) — using new medicines for a heart rhythm problem instead of an older one
• PARADIGM-HF (2014) — using a new kind of medicine for heart failure
• ISCHEMIA (2020) — using medicine can be just as good as putting small tubes in the heart for stable heart disease
• EMPEROR-Preserved (2021) — using a special kind of medicine for heart failure

Cardiology community

Cardiology has many groups and important people who help learn more about the heart. Some big groups include the American Heart Association, European Society of Cardiology, and Heart Rhythm Society.

There are also many doctors who made big discoveries about the heart. For example, Christiaan Barnard did the first human heart transplant, and Willem Einthoven created a way to record the heart’s electricity. These experts help us understand and treat heart problems better.