What are the effects if the contrast agent is not expelled after a cardiac angiography?

Generally, if the contrast agent is not excreted after a cardiac angiography, it may lead to effects such as contrast agent allergy, vascular injury, slowed heart rate, and decreased blood pressure.

1. Contrast Agent Allergy

Typically, contrast agents contain iodine. In some patients, failure to excrete the contrast agent after cardiac angiography may trigger an allergic reaction, such as local swelling, redness, rashes, or even anaphylactic shock.

2. Kidney Damage

Contrast agents can cause certain kidney damage. If a patient has weak cardiac function and the contrast agent is not properly excreted after cardiac angiography, it may result in kidney injury and worsening renal function.

3. Slowed Heart Rate and Lowered Blood Pressure

In some patients, retention of the contrast agent after cardiac angiography may lead to bradycardia (slowed heart rate) and hypotension (low blood pressure). Some individuals may also experience dizziness, headache, or confusion. If there are underlying cardiac complications, arrhythmias may occur, leading to premature beats, tachycardia, or myocardial ischemia.

If the contrast agent is not excreted after cardiac angiography, patients are advised to seek medical attention promptly and take precautions to prevent wound infection.