Spatial QRS-T angle predicts cardiac death in a general population

Area of Science:

• Cardiology
• Geriatrics
• Preventive Medicine

Background:

• The spatial QRS-T angle, derived from electrocardiograms (ECGs), is a less-explored parameter in cardiovascular risk assessment.
• Traditional cardiovascular risk factors and ECG indicators are established predictors of cardiac events.

Purpose of the Study:

• To evaluate the prognostic significance of the spatial QRS-T angle for fatal and non-fatal cardiac events in an elderly population.
• To compare the predictive power of the spatial QRS-T angle against established cardiovascular risk factors and ECG predictors.

Main Methods:

• Prospective population-based study (Rotterdam Study) involving 6134 participants aged 55 years and over.
• ECGs were analyzed to categorize spatial QRS-T angles as normal, borderline, or abnormal.
• Cox's proportional hazards model was used to assess hazard ratios for cardiac events and mortality.

Main Results:

• Abnormal spatial QRS-T angles were associated with significantly increased hazard ratios for cardiac death, non-fatal cardiac events, sudden death, and total mortality.
• The spatial QRS-T angle demonstrated higher hazard ratios than classical cardiovascular and ECG predictors for fatal endpoints.
• After adjusting for traditional predictors, the association of abnormal angles with fatal events remained strong, but weakened for non-fatal events.

Conclusions:

• The spatial QRS-T angle is a potent and independent predictor of cardiac mortality in the elderly population.
• Its predictive value for fatal cardiac events surpasses that of conventional cardiovascular risk factors and ECG risk indicators.
• The spatial QRS-T angle offers incremental prognostic value for predicting fatal cardiac events.