Performance Comparison of Fast QRS Detection Algorithms

Taddei, Alessandro; Marchesi, Carlo; Landucci, Lea

doi:10.1007/978-94-009-6012-1_17

“…In order to obtain a spectral representation of the RR interval variability, an autoregressive model was applied to consecutive intervals of 256 data points throughout the 24-h period, as previously described [18]. Two orders of spontaneous oscillations were considered in the RR power spectrum: low-frequency rhythm (LF, from 0.03 to 0.15 Hz) and respiratory sinus arrhythmia (high frequency component, HF, from 0.15 to 0.40 Hz).…”

Section: Ecg Data Processingmentioning

confidence: 99%

Abnormal ventricular repolarization in hypertensive patients: role of sympatho-vagal imbalance and left ventricular hypertrophy

Passino

¹

,

Franzoni

²

,

Gabutti

³

et al. 2004

International Journal of Cardiology

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“…The ECG was processed by using extensively tested algorithms [16] in order to detect the QRS complex and the R wave reference point by a derivative\amplitude criterion, without interpolation of the original signal. Using the R wave reference point, the blood pressure signal was also processed by an appropriate algorithm in order to detect diastolic and systolic blood pressure values.…”

Section: Power Spectrum Analysismentioning

confidence: 99%

Impaired sympathetic response before intradialytic hypotension: a study based on spectral analysis of heart rate and pressure variability

Pelosi

¹

,

EMDIN

²

,

CARPEGGIANI

³

et al. 1999

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The purpose of this study was to evaluate the autonomic response to standard haemodialysis and the changes associated with the onset of intradialytic hypotension in 12 normotensive patients with uraemia. Power spectra of R-R interval and of blood pressure fluctuations were obtained during a standard dialysis session and estimated in the low-frequency (LF, 30-150 mHz) and high-frequency (HF, 150-400 mHz) range. The absolute power of the LF component of blood pressure variations and the LF/HF ratio of R-R interval were assumed as indexes of sympathetic activity. Standard haemodialysis induced hypotension in six patients (unstable) while a minor pressure decline was present in the other six (stable). Normalized blood volume before dialysis and percentage volume reduction were similar in the two groups. Tachycardia in response to pressure and volume decrease was more pronounced in stable than in unstable patients, as evidenced by a higher slope of the relation between R-R interval and systolic blood pressure (7.9 versus 0.9 ms/mmHg, P<0.01). Sympathetic tone was enhanced during early dialysis in all patients (+2+/-1 for R-R LF/HF ratio, +2.4+/-0.6 mmHg2 and +7.2+/-2 mmHg2 for absolute LF power of diastolic and of systolic blood pressure respectively, P<0.05), compared with baseline predialysis values. During late dialysis, unstable patients showed an impairment of sympathetic activation which preceded hypotension and was maximal during the crisis (-2.9+/-1.4 for R-R LF/HF ratio, -2.7+/-1.4 mmHg2 and -8.6+/-4.0 mmHg2 for absolute LF power of diastolic and of systolic blood pressure respectively, P<0.05). On the contrary, stable patients showed constantly elevated indexes (+3.7+/-1.4 for R-R LF/HF ratio, +5.9+/-2.7 mmHg2 and +13.3+/-6.2 mmHg2 for LF of diastolic and of systolic blood pressure, P<0.05). Values returned to predialysis levels after the end of the dialysis session in all patients. We conclude that standard haemodialysis activates a marked and reversible sympathetic response in both stable and unstable uraemic patients. However, in unstable patients, such activation is impaired in late dialysis, therefore contributing to the onset of the hypotensive crisis.

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“…The ECG was processed by using extensively tested algorithms [16] in order to detect the QRS complex and the R wave reference point by a derivative\amplitude criterion, without interpolation of the original signal. The ECG was processed by using extensively tested algorithms [16] in order to detect the QRS complex and the R wave reference point by a derivative\amplitude criterion, without interpolation of the original signal.…”

Section: Power Spectrum Analysismentioning

confidence: 99%

Impaired sympathetic response before intradialytic hypotension: a study based on spectral analysis of heart rate and pressure variability

Pelosi

¹

,

Emdin

²

,

Carpeggiani

³

et al. 1999

View full text Add to dashboard Cite

The purpose of this study was to evaluate the autonomic response to standard haemodialysis and the changes associated with the onset of intradialytic hypotension in 12 normotensive patients with uraemia. Power spectra of R-R interval and of blood pressure fluctuations were obtained during a standard dialysis session and estimated in the low-frequency (LF, 30-150 mHz) and high-frequency (HF, 150-400 mHz) range. The absolute power of the LF component of blood pressure variations and the LF/HF ratio of R-R interval were assumed as indexes of sympathetic activity. Standard haemodialysis induced hypotension in six patients (unstable) while a minor pressure decline was present in the other six (stable). Normalized blood volume before dialysis and percentage volume reduction were similar in the two groups. Tachycardia in response to pressure and volume decrease was more pronounced in stable than in unstable patients, as evidenced by a higher slope of the relation between R-R interval and systolic blood pressure (7.9 versus 0.9 ms/mmHg, P<0.01). Sympathetic tone was enhanced during early dialysis in all patients (+2+/-1 for R-R LF/HF ratio, +2.4+/-0.6 mmHg2 and +7.2+/-2 mmHg2 for absolute LF power of diastolic and of systolic blood pressure respectively, P<0.05), compared with baseline predialysis values. During late dialysis, unstable patients showed an impairment of sympathetic activation which preceded hypotension and was maximal during the crisis (-2.9+/-1.4 for R-R LF/HF ratio, -2.7+/-1.4 mmHg2 and -8.6+/-4.0 mmHg2 for absolute LF power of diastolic and of systolic blood pressure respectively, P<0.05). On the contrary, stable patients showed constantly elevated indexes (+3.7+/-1.4 for R-R LF/HF ratio, +5.9+/-2.7 mmHg2 and +13.3+/-6.2 mmHg2 for LF of diastolic and of systolic blood pressure, P<0.05). Values returned to predialysis levels after the end of the dialysis session in all patients. We conclude that standard haemodialysis activates a marked and reversible sympathetic response in both stable and unstable uraemic patients. However, in unstable patients, such activation is impaired in late dialysis, therefore contributing to the onset of the hypotensive crisis.

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Performance Comparison of Fast QRS Detection Algorithms

Cited by 24 publications

References 4 publications

Abnormal ventricular repolarization in hypertensive patients: role of sympatho-vagal imbalance and left ventricular hypertrophy

Abnormal ventricular repolarization in hypertensive patients: role of sympatho-vagal imbalance and left ventricular hypertrophy

Impaired sympathetic response before intradialytic hypotension: a study based on spectral analysis of heart rate and pressure variability

Impaired sympathetic response before intradialytic hypotension: a study based on spectral analysis of heart rate and pressure variability

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