Utility of implantable loop recorders for diagnosing unexplained syncope in clinical practice

Area of Science:

• Cardiology
• Medical Devices
• Diagnostic Tools

Background:

• Unexplained syncope diagnosis is challenging due to event unpredictability.
• Prolonged monitoring with implantable loop recorders (ILRs) captures electrocardiogram (ECG) data during syncopal episodes.

Purpose of the Study:

• To evaluate the clinical utility of ILRs for diagnosing syncope of unknown origin.
• To assess the effectiveness of ILR in patients with unexplained syncope after conventional work-up.

Main Methods:

• Retrospective review of ILR implantation results in patients with unexplained syncope.
• Analysis of diagnostic ECG recordings during recurrent syncope events.

Main Results:

• 51 out of 140 patients (36.5%) experienced recurrent syncope with diagnostic ECG recordings.
• An arrhythmic cause was identified in 64.5% of these cases (bradycardia in 53%, tachycardia in 11%).
• The ILR strategy was safe, with no sudden deaths reported.

Conclusions:

• ILR implantation is a valuable tool for diagnosing unexplained syncope in clinical practice.
• Arrhythmogenic causes are common and treatable in patients with unexplained syncope.
• ILR monitoring is a safe diagnostic approach, even for patients with structural heart disease.