Kynnyssähkökäyrien

Kynnyssähkökäyrät, also known as threshold electrograms, are a type of electrocardiogram recording used primarily in electrophysiology studies, particularly during cardiac ablation procedures. They represent the electrical potential recorded by a catheter electrode at the point where the electrical impulse crosses a defined threshold. This threshold is typically set to a specific voltage amplitude.

The primary purpose of kynnyssähkökäyrien is to help electrophysiologists identify and characterize specific cardiac arrhythmias. By observing the timing and amplitude of the electrical signals relative to the set threshold, they can distinguish between normal cardiac activation and abnormal pathways or durations. For instance, during atrial fibrillation ablation, kynnyssähkökäyrät can help pinpoint areas of slow conduction that are crucial for maintaining the arrhythmia.

These recordings are distinct from standard surface ECGs, which capture the overall electrical activity of the heart from the body's surface. Kynnyssähkökäyrien are derived from intracardiac electrograms and require specialized equipment and expertise to interpret. The data is often displayed as a series of waveforms, where the clinician analyzes the morphology, duration, and latency of these signals in relation to the stimulation or pacing maneuvers performed. This detailed information aids in understanding the underlying mechanisms of arrhythmias and guiding catheter manipulation for successful treatment.