J-Wave in Patients With Syncope.

Syncope remains a frequent clinical concern. While J-waves appear commonly on electrocardiograms, their clinical significance in syncope is uncertain. Prior research has shown that J-waves are often benign but may correlate with certain arrhythmias. No prior work had resolved how J-waves might relate to syncope mechanisms. This gap motivated a focus on syncope patients without structural heart disease. The study aimed to clarify if J-waves could serve as a marker for syncope subtypes. No prior studies had examined J-wave morphology in relation to head-up tilt test outcomes. This uncertainty drove the need for a detailed analysis of ECG patterns and HUT results. The goal was to identify a reproducible link between J-waves and syncope triggers.

The study aimed to assess whether J-waves correlate with syncope outcomes. Specifically, it sought to determine if J-wave presence or morphology predicts HUT results. Researchers focused on patients without structural heart disease to avoid confounding factors. The goal was to isolate the role of J-waves in syncope mechanisms. They hypothesized that J-waves might indicate a higher risk of neurally mediated syncope. The study also aimed to compare different J-wave morphologies for risk prediction. No prior work had examined how J-wave ST-segment direction affects syncope risk. This approach allowed a focused analysis of J-waves in syncope diagnostics.

Researchers analyzed 259 syncope patients after excluding those with structural heart disease. J-waves were defined as ≥1 mm in inferior or lateral leads. Patients underwent head-up tilt testing for 30 minutes. If no syncope occurred, drug loading was added before retesting. Data were stratified by J-wave presence and morphology. Inferior lead ST-segment direction was categorized as ascending or descending/horizontal. Odds ratios were calculated for HUT positivity in each group. Statistical comparisons focused on J-wave presence and HUT outcomes.

J-waves were present in 37% of patients, with higher HUT positivity rates in this group. Patients with J-waves had a 0.0001 lower P-value for HUT positivity compared to those without. Descending/horizontal ST segments in inferior leads showed stronger HUT associations. The odds ratio for HUT positivity was 3.23 in this subgroup. Ascending ST segments showed weaker associations with HUT outcomes. J-wave prevalence was higher in syncope patients than in general population norms. No significant gender differences were found in J-wave distribution. These findings suggest that J-wave morphology may refine syncope risk stratification.

The authors propose that J-waves may indicate a higher likelihood of HUT-positive syncope. They suggest that descending/horizontal ST segments in inferior leads correlate more strongly with HUT outcomes. This combination may serve as a marker for neurally mediated reflex syncope. The study does not claim that J-waves cause syncope but notes their association. No prior work had demonstrated this specific relationship between J-wave morphology and HUT results. The findings may help clinicians identify syncope subtypes more effectively. The authors do not propose new treatment approaches but suggest further study of J-wave patterns. These results may guide future diagnostic protocols for syncope patients.