QTc Interval Predicts Disturbed Circadian Blood Pressure Variation
Liyuan Yan1, Jianling Jin2, Shili Jiang2
1Department of Cardiology, the First Affiliated Hospital of Soochow University, No.188, Shizi Road, Suzhou, 215006, Jiangsu, China.
Insights
Electrocardiographic QTc interval variations are linked to abnormal blood pressure patterns in young and middle-aged hypertensive patients. Longer QTc intervals may indicate increased risk for non-dipper and reverse-dipper blood pressure patterns.
Area of Science:
- Cardiology
- Hypertension Research
Background:
- The link between electrocardiographic (ECG) findings and blood pressure (BP) variability over 24 hours is not well understood in younger hypertensive individuals.
- Investigating this relationship can improve risk stratification and management strategies for hypertension.
Purpose of the Study:
- To explore the association between electrocardiographic parameters and different circadian blood pressure (BP) patterns in young and middle-aged hypertensive patients.
- To determine if specific ECG metrics can predict abnormal BP dipping status.
Main Methods:
- 171 hypertensive patients were analyzed, categorized by age (young/middle-aged vs. elderly).
- Patients were further classified into dipper, non-dipper, and reverse-dipper BP patterns based on 24-hour ambulatory BP monitoring.
- 12-lead electrocardiography (ECG) was performed to assess various parameters, including QTc interval.
Main Results:
- In young and middle-aged hypertensive patients, the QTc interval was shortest in dippers and longest in reverse-dippers.
- The QTc interval was identified as an independent risk factor for both non-dipper (OR 1.049) and reverse-dipper (OR 1.051) BP patterns.
- No significant differences in other ECG parameters were observed among the BP dipping subgroups in this age group.
Conclusions:
- The QTc interval may serve as a valuable risk indicator for identifying non-dipper and reverse-dipper BP patterns in younger hypertensive populations.
- These findings highlight the potential of ECG evaluation in predicting abnormal circadian BP variations.
Background:
The relationship between electrocardiographic evaluation and circadian blood pressure (BP) variation in young and middle-aged hypertensive patients remains unknown.
Methods:
A total of 171 hypertensive patients were included in the study. First, patients were divided into a young and middle-aged group and an elderly group. The two groups were then separately classified into three subgroups on the basis of circadian variation of BP as dippers, non-dippers and reverse-dippers. The electrocardiographic evaluation was calculated from 12-lead electrocardiography (ECG).
Results:
QTc intervals were shortest in the dippers and longest in the reverse-dippers in the young and middle-aged group (QTc dipper: 416.53±18.37ms; non-dipper: 438.30±29.71ms; reverse-dipper: 444.93±25.47ms; for dipper vs non-dipper, and dipper vs reverse-dipper P<0.05). QTc interval was found to be an independent risk factor for the non-dipper BP pattern (Odds ratio 1.049; 95% CI 1.01-1.089; P=0.012) and reverse-dipper BP pattern (Odds ratio 1.051; 95% CI 1.007-1.098; P=0.023) in young and middle-aged hypertensive patients. No significant differences in other ECG parameters were found among the three subgroups in the young and middle-aged group.
Conclusion:
Our study suggested that QTc interval might serve as a risk factor for non-dipper BP pattern and reverse-dipper BP pattern in young and middle-aged hypertensive patients.
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