Cardiologists play a key role in diagnosing, treating, and preventing heart and blood vessel diseases. While many people associate cardiologists with emergency situations such as heart attacks or chest pain, their work extends to managing risk factors and helping patients prevent heart disease.
Dr. Joe Aoun, an interventional cardiologist at Houston Methodist, explains: “A cardiologist is a medical doctor who specializes in diagnosing and treating heart disease and or blood vessel disease. Basically, that’s what we call cardiovascular disease.”
Cardiologists manage conditions including high blood pressure, coronary artery disease, heart failure, irregular heart rhythms like atrial fibrillation, adult congenital heart disease, and heart valve disease. However, not all cardiologists treat every condition; the field includes several subspecialties.
General cardiologists are often the first specialists patients see for symptoms of heart or blood vessel disease or if they have multiple risk factors. They conduct exams and tests to diagnose conditions and recommend treatment plans involving medications or lifestyle changes. Patients with non-emergent symptoms such as chest pain or those with risk factors like high blood pressure may be referred to general cardiologists.
“Genetics play a role,” says Dr. Aoun. “If you have a history in my family of heart disease, or heart failure, or heart attacks — especially at a younger age — seeking the care of a cardiologist is very important.”
Other risk factors include smoking, diabetes, being overweight, and age.
Interventional cardiologists are described by Dr. Aoun as the “plumbers” of the heart: “We can open up clogged arteries and treat valves with transcatheter options — without opening the chest. That means going through the groin or the wrist and fixing the valves.” These specialists perform procedures such as angioplasty and stent placement to restore blood flow.
Electrophysiologists focus on rhythm problems within the heart’s electrical system. According to Dr. Aoun: “Electrophysiologists focus on rhythm problems in the heart, such as irregular heartbeats or dizziness related to heart issues.” They diagnose arrhythmias and may implant pacemakers or defibrillators.
Heart failure specialists provide advanced therapies when the heart cannot pump effectively. Dr. Aoun notes: “Whenever the heart is very weak and needs advanced therapies such as heart transplants or LVADs — left ventricular assist devices — that’s when heart failure specialists are involved.”
Cardiac imaging specialists interpret diagnostic images such as echocardiograms (ultrasounds), CT scans, and MRIs to detect structural abnormalities in the heart. Dr. Aoun states: “Cardiac imagers are subspecialized in reading echocardiograms, CT scans, or cardiac MRIs.”
Adults born with congenital structural issues may need ongoing care from adult congenital heart disease (ACHD) specialists who monitor long-term complications after childhood interventions.
Heart surgeons differ from cardiologists by performing open-heart surgeries for severe conditions that cannot be managed noninvasively. As Dr. Aoun clarifies: “Heart surgeons are usually not considered cardiologists… Cardiac surgeons are a different specialty.”
Another subspecialty is cardio-oncology; these doctors help cancer patients manage potential cardiac side effects from treatments like chemotherapy.
Whether a referral is needed depends on insurance policies; Dr. Aoun advises patients to check their health plan before making appointments but also recommends starting with primary care doctors who can direct them appropriately: “Sometimes it’s not necessarily the heart that is causing symptoms… They may need to be referred to other medical specialties.”
Symptoms that could indicate it’s time to see a cardiologist include chest pain or pressure, shortness of breath during activity, palpitations, swelling in legs, dizziness or fainting.
Some signs require immediate emergency attention: “If someone suddenly experiences shortness of breath or faints or is experiencing chest pain that lasts more than a few minutes, especially with sweating, nausea, or difficulty breathing — definitely call 911,” says Dr. Aoun. He adds that persistent chest pain radiating to other areas can signal a possible heart attack requiring urgent care.
