MRI safety of TAVR or TAVI Valves
Transcatheter Aortic Valve Implantation (TAVI) is a minimally invasive procedure used to replace a diseased aortic valve with a prosthetic valve. Magnetic Resonance Imaging (MRI) is a diagnostic imaging technique that uses a strong magnetic field and radio waves to generate detailed images of the body's internal structures. When considering the safety of TAVI in relation to MRI, there are a few important points to consider:
1. MRI Compatibility of TAVI Devices: The prosthetic valves used in TAVI procedures are typically made of metal and may contain components that can be affected by the strong magnetic field of an MRI machine. In the past, many TAVI devices were considered contraindicated for MRI due to potential risks such as valve displacement or heating. However, newer generations of TAVI devices have been developed with improved MRI compatibility.
You can check the MRI compatibility of your valve or device at : http://www.mrisafety.com/TMDL_list.php
2. MRI Conditional TAVI Devices: Some TAVI devices are specifically designed and labeled as "MRI conditional." This means that they have been tested and determined to be safe for use in patients undergoing MRI under certain conditions. The manufacturer's instructions for use (IFU) provide specific information regarding the MRI conditions that can be safely followed, such as the maximum magnetic field strength, specific absorption rate (SAR) limits, and scanning sequences.
3. Precautions and Assessments: Before undergoing an MRI, it is essential to assess the specific TAVI device implanted and its compatibility with MRI. This assessment is typically performed by the treating physician or a radiologist. They will review the patient's medical history, including the details of the TAVI procedure and the implanted device, and consult the device manufacturer's guidelines to determine if an MRI can be safely performed.
4. Monitoring and Follow-up: In some cases, additional monitoring may be required during an MRI scan for patients with TAVI devices. This may involve continuous monitoring of vital signs and electrocardiography (ECG) to ensure the patient's safety throughout the procedure. The medical team will closely observe the patient for any signs of discomfort, abnormal valve function, or complications during and after the MRI.
It's important to note that the specific safety guidelines and recommendations can vary depending on the TAVI device used and its MRI compatibility. Therefore, it is crucial for patients and healthcare professionals to consult the device manufacturer's instructions and work together to make informed decisions regarding MRI safety for individuals with TAVI implants.