Design and implementation of a PC-based data acquisition system for measuring ECG and respiratory signals

Suominen, Kalervo

doi:10.1007/bf03356567

Cited by 6 publications

(9 citation statements)

References 10 publications

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“…Test performances in deep breathing, the Valsalva manoeuvre and the isometric work tests were checked on-line and off-line and only adequately accomplished test performances were accepted for analysis [44].…”

Section: Autonomic Testsmentioning

confidence: 99%

Levodopa, bromocriptine and selegiline modify cardiovascular responses in Parkinson's disease

Haapaniemi

Kallio

Korpelainen

et al. 2000

Journal of Neurology

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Autonomic nervous system (ANS) involvement is frequently found in Parkinson's disease (PD), but its causal relationship to the disease itself and its medication is unclear. We evaluated the effects of PD medications on cardiovascular ANS functions. Heart rate (HR) responses to normal and deep breathing, the Valsalva manoeuvre and tilting, and blood pressure (BP) responses to tilting and isometric work were measured prospectively in 60 untreated PD patients randomised to receive either levodopa (n = 20), bromocriptine (n = 20) or selegiline (n = 20) as their initial treatment. The results were compared with those of 28 healthy controls. The responses were recorded at baseline, after 6 months on medication and following a 6-week washout period. At baseline HR responses to normal breathing, deep breathing and tilting were already lower and the fall in the systolic BP immediately and at 5 min after tilting was more pronounced in the PD patients than in the controls. Six months' levodopa treatment diminished the systolic BP fall after tilting when compared to baseline, whereas bromocriptine and selegiline increased the fall in systolic BP after tilting and selegiline diminished the BP responses to isometric work. The BP responses returned to the baseline values during the washout period. The drugs induced no change in the HR responses. Thus PD itself causes autonomic dysfunction leading to abnormalities in HR and BP regulation and the PD medications seem to modify ANS responses further. Bromocriptine and selegiline, in contrast to levodopa, increase the orthostatic BP fall and suppress the BP response to isometric exercise reflecting mainly impairment of the sympathetic regulation.

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Section: Autonomic Testsmentioning

confidence: 99%

Levodopa, bromocriptine and selegiline modify cardiovascular responses in Parkinson's disease

Haapaniemi

Kallio

Korpelainen

et al. 2000

Journal of Neurology

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“…In the tilt table test, the HR responses to quick passive tilting (2 s, 90°) and after tilting (7 min) were recorded. A more detailed description of the methodology of the autonomic cardiac test pattern of the patients and control subjects has been previously published [8, 35]. …”

Section: Methodsmentioning

confidence: 99%

“…The adaptive responses of the ANS to various stimuli are assessed during the test [34]. Although the analysis of HR variation from an ECG of short duration obtained during the autonomic cardiac function tests may not be as sensitive as spectral analyses of HR variation from 24-hour Holter recordings in revealing subtle abnormalities in linear as well as dynamic fluctuations of HR variation, the method provides valuable information when conducted according to the strict protocol developed [34, 35]. Spectral analyses of HR variation can also be performed from the short ECG recordings obtained during the autonomic function tests.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Heart Rate Variation Analysis during Rest and Tilting in Patients with Temporal Lobe Epilepsy

Ansakorpi

Korpelainen²,

Suominen³

et al. 2011

Neurology Research International

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Objective. To evaluate spectral heart rate (HR) variation using short-term ECG recordings at rest and during the tilt table test. Methods. The values of spectral components of total power (TP), high-frequency power (HF), low-frequency power (LF) and LF: HF ratio were measured at rest and during the head-up tilt in patients with temporal lobe epilepsy (TLE) and their control subjects. Results. Compared to the control subjects, patients with TLE had lower HF (P < 0.05) and LF : HF ratio (P < 0.05) at rest and lower TP (P < 0.001), HF (P < 0.05), and LF (P < 0.05) during the head-up tilt. Upon changing from supine to standing position TP (P < 0.05) and LF (P < 0.05) were attenuated in patients with TLE compared to the control subjects. Conclusion. These results suggest that spectral analysis of HR variation from ECG recordings of short duration may add value to assessment of autonomic nervous system function using autonomic cardiac tests in patients with TLE.

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“…The ECG and breathing (nasal thermistor) signals were conveyed through an A/D converter with a sampling frequency of 320 Hz to a PC computer and were analyzed off‐line by using an automatic program package that allowed visual checking of the raw ECG and breathing signals (23). A more detailed description of the cardiovascular reflex tests used was previously published (7,8).…”

Section: Methodsmentioning

confidence: 99%

Cardiovascular Regulation and Hippocampal Sclerosis

Ansakorpi

Korpelainen²,

Tanskanen

et al. 2004

Epilepsia

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Summary:Purpose: Cardiovascular dysregulation has been detected in patients with temporal lobe epilepsy (TLE) by using cardiovascular reflex tests and analysis of heart rate variability (HRV). The two methods have not previously been used in the same study to compare them in the assessment of cardioregulatory function. Magnetic resonance imaging (MRI) is considered the best method to reveal structural changes such as hippocampal sclerosis associated with TLE. It is not known whether these structural changes modify cardioregulatory function in patients with TLE.Methods: Standard cardiovascular reflex tests and analysis of spectral and dynamic measures from 24-h electrocardiogram (ECG) recordings were performed for eight patients with and 31 patients without hippocampal sclerosis and for 72 control subjects. MRI also was performed in each patient to reveal hippocampal sclerosis.Results: Various measures of cardiovascular reflexes and HRV were diminished in patients with TLE compared with the control subjects. No significant differences were found in the measures obtained from the cardiovascular reflex tests or analysis of HRV between those with and without hippocampal sclerosis, although a nonsignificant trend toward reduced values was seen among those with hippocampal sclerosis. The values of cardiovascular reflexes and spectral analysis of HRV correlated with each other.Conclusions: These results suggest that functional rather than structural changes related to TLE are involved mainly as a mechanism of altered cardioregulatory function. The cardiovascular reflex test and analysis of HRV both appear to be useful in studying cardioregulation in patients with TLE.

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Design and implementation of a PC-based data acquisition system for measuring ECG and respiratory signals

Cited by 6 publications

References 10 publications

Levodopa, bromocriptine and selegiline modify cardiovascular responses in Parkinson's disease

Levodopa, bromocriptine and selegiline modify cardiovascular responses in Parkinson's disease

Evaluation of Heart Rate Variation Analysis during Rest and Tilting in Patients with Temporal Lobe Epilepsy

Cardiovascular Regulation and Hippocampal Sclerosis

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