6 Common Heart Tests Explained by a Cardiologist

Understanding Cardiac Tests

• 💡 The video explains common cardiac tests, detailing what each test measures, how it's performed, and when it's recommended.
• 🩺 Cardiologists use these tests to diagnose heart conditions, monitor blood flow, and assess overall cardiac function.

Electrocardiogram (ECG/EKG)

• ⚡ An ECG is a quick, painless, 5-second electrical snapshot of the heart's rhythm.
• 📌 It can indicate rhythm issues, past heart attacks, or potentially a blocked artery during chest discomfort.
• ⚠️ A limitation is that it's a static image, missing events that occur between recordings.

Stress Tests

• 🏃 Exercise stress tests involve exercising on a treadmill while monitoring the ECG for abnormalities that may indicate a blocked artery.
• 💉 For patients unable to exercise, a chemical stress test uses an injection to open heart arteries, highlighting blockages through imaging.
• 🏥 These tests carry a low risk (1 in 10,000) of inducing a cardiac event, requiring performance in a reputable center with emergency equipment.
• 🎯 The accuracy of a standard stress test is around 70%.

Advanced Imaging and Invasive Procedures

• 💖 A stress echocardiogram combines a resting ultrasound of the heart with exercise, capturing images at peak exertion to assess wall motion abnormalities caused by blocked arteries.
• 📈 This test has an accuracy of 85-90% and is non-invasive.
• 💻 A CT coronary angiogram uses X-rays and contrast dye to provide detailed images of the coronary arteries, excellent for ruling out problems.
• 💉 The invasive coronary angiogram is considered the gold standard, using a catheter inserted through the wrist or leg to directly visualize the heart's arteries with dye.

Arrhythmia Monitoring

• ⌚ Holter monitors record heartbeats over 24-72 hours (or longer with newer devices) to detect irregular rhythms, pauses, or fast/slow heart rates.
• ✍️ Patients keep a diary to correlate symptoms with recorded heart activity.
• 📱 Wearable technology like smartwatches can also capture ECG data, aiding in the detection of conditions like atrial fibrillation.

Echocardiogram (Echo)

• 🩺 A standard echocardiogram is a crucial ultrasound of the heart, assessing its structure, valve function (leaky or narrowed), pumping strength, and damage from heart attacks.
• 🔬 Contrast echocardiograms use microbubbles to improve image quality, especially when standard imaging is difficult due to patient anatomy.
• ✅ This test is non-invasive, safe, and provides comprehensive information for guiding treatment decisions.