Which statement correctly expresses why FF-IEGM should not be used alone for interpretation?

Which statement correctly expresses why FF-IEGM should not be used alone for interpretation?

• A. FF-IEGM is biased and should be supplemented with surface ECG
• B. FF-IEGM is unbiased and sufficient
• C. FF-IEGM is the only reference needed
• D. FF-IEGM is unreliable

Answer: (D)

The main idea is that far-field intracardiac electrograms do not reliably reflect the exact local activation you’re trying to interpret. They capture electrical activity from distant parts of the heart, and their timing and amplitude can be distorted by how the catheter sits, how well it contacts tissue, and the filtering used during recording. This can make a signal seem earlier or later than the true local activation, or mask it altogether, leading to misinterpretation if you rely on it alone. Because of these limitations, FF-IEGM should be used in conjunction with local near-field electrograms, surface ECG, mapping data, and pacing responses to accurately determine activation patterns or rhythm origin. Other statements, like claiming it is biased, unbiased and sufficient, or the only reference needed, don’t capture the fundamental issue that far-field signals are inherently unreliable as sole evidence.

The main idea is that far-field intracardiac electrograms do not reliably reflect the exact local activation you’re trying to interpret. They capture electrical activity from distant parts of the heart, and their timing and amplitude can be distorted by how the catheter sits, how well it contacts tissue, and the filtering used during recording. This can make a signal seem earlier or later than the true local activation, or mask it altogether, leading to misinterpretation if you rely on it alone. Because of these limitations, FF-IEGM should be used in conjunction with local near-field electrograms, surface ECG, mapping data, and pacing responses to accurately determine activation patterns or rhythm origin. Other statements, like claiming it is biased, unbiased and sufficient, or the only reference needed, don’t capture the fundamental issue that far-field signals are inherently unreliable as sole evidence.