scholarly journals MRI-related anxiety in healthy individuals, intrinsic BOLD oscillations at 0.1 Hz and heart rate variability in low frequency bands

2018 ◽  
Author(s):  
Gert Pfurtscheller ◽  
Andreas Schwerdtfeger ◽  
David Fink ◽  
Clemens Brunner ◽  
Christoph Stefan Aigner ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Middle Cerebral Artery ◽  
Frequency Band ◽  
Cerebral Artery ◽  
Time Delays ◽  
Low Frequency ◽  
Small Drop ◽  
Healthy Individuals ◽  
Large Drop

AbstractParticipation in a MRI scan is associated with increased anxiety, thus possibly impacting baseline recording for functional MRI studies. We investigated in 23 healthy individuals without any former MRI experience (scanner-naïve) the relations between anxiety, 0.1-Hz BOLD oscillations and heart rate variability (HRV) in two separate resting state sessions (R1, R2). BOLD signals were recorded from precentral gyrus (PCG) and insula in both hemispheres. Phase-locking and time delays were computed in the frequency band 0.07–0.13 Hz. Positive (pTD) and negative time delays (nTD) were found. The pTD characterize descending neural BOLD oscillations spreading from PCG to insula and nTD characterize ascending vascular BOLD oscillations related to blood flow in the middle cerebral artery. HRV power in two low frequency bands 0.06–0.1 Hz and 0.1–0.14 Hz was computed. Based on the drop rate of the anxiety level from R1 to R2, two groups could be identified: one with a strong anxiety decline (large drop group) and one with a moderate decline or even anxiety increase (small drop group). A significant correlation was found only between the left-hemispheric time delay (pTD, nTD) of BOLD oscillations and anxiety drop, with a dominance of nTD in the large drop group. The analysis of within-scanner HRV revealed a pronounced increase of low frequency power between both resting states, dominant in the band 0.06–0.1 Hz in the large drop group and in the band 0.1–0.14 Hz in the small drop group. These results suggest different mechanisms related to anxiety processing in healthy individuals. One mechanism (large drop group) could embrace an increase of blood circulation in the territory of the left middle cerebral artery (vascular BOLD) and another (small drop group) translates to rhythmic central commands (neural BOLD) in the frequency band 0.1–0.14 Hz.

scholarly journals Identifying autonomic nervous system dysfunction in acute cerebrovascular attack by assessments of heart rate variability and catecholamine levels

2015 ◽  
Vol 6 (02) ◽  
pp. 145-150 ◽  
Author(s):  
Akil Eşref ◽  
Yusuf Tamam ◽  
Mehmet Ata Akil ◽  
İbrahim Kaplan ◽  
Mehmet Zihni Bilik ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Middle Cerebral Artery ◽  
Cerebral Artery ◽  
Time Domain ◽  
Low Frequency ◽  
Middle Cerebral Artery Territory ◽  
Stroke Patients ◽  
The Right ◽  
Catecholamine Levels

ABSTRACT Objective: This study aimed to evaluate changes in the autonomic nervous system caused by cerebral lesions due to acute stroke. We assessed heart rate variability and catecholamine levels in lieu of stroke lesion localization. Materials and Methods: A total of 60 stroke patients and 31 healthy controls were enrolled in the study. Plasma epinephrine and norepinephrine levels were measured on the first, third, and seventh days following the stroke event. Heart rate variability was evaluated with time-domain and frequency-domain analyses via 24-hour Holter monitor recordings. Results: On the first and third day following the stroke, norepinephrine levels were significantly higher in all patient groups as compared to controls. Epinephrine levels on the first, third and seventh days after the stroke were significantly higher in patients with lesions in the right middle cerebral artery territory than controls. In frequency-domain analysis, patients with right middle cerebral artery territory lesions had greater low frequency and low frequency to high frequency ratio values than controls. Time-domain analysis revealed significant decreases in the standard deviation from the mean for 5-minute 288 R-R intervals in patients with lesions in the right middle cerebral artery and posterior cerebral artery territory when contrasted with controls. Patients with lesions in the right middle cerebral artery territory demonstrated the highest increase in the percentage of consecutive R-R intervals differing by more than 50 ms (pNN50) as compared to the control group. Conclusion: These findings indicate that autonomic dysfunction favoring an increase in sympathetic activity occurs in acute stroke patients.

scholarly journals Correction: MRI-related anxiety in healthy individuals, intrinsic BOLD oscillations at 0.1 Hz in precentral gyrus and insula, and heart rate variability in low frequency bands

PLoS ONE ◽  
2019 ◽  
Vol 14 (5) ◽  
pp. e0216731
Author(s):  
Gert Pfurtscheller ◽  
Andreas Schwerdtfeger ◽  
David Fink ◽  
Clemens Brunner ◽  
Christoph Stefan Aigner ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Low Frequency ◽  
Precentral Gyrus ◽  
Healthy Individuals ◽  
Frequency Bands

Heart rate variability and dissociation in panic disorder

2011 ◽  
Vol 26 (S2) ◽  
pp. 147-147
Author(s):  
T. Diveky ◽  
D. Kamaradova ◽  
A. Grambal ◽  
K. Latalova ◽  
J. Prasko ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Panic Disorder ◽  
Frequency Band ◽  
High Frequency ◽  
Power Spectra ◽  
Low Frequency ◽  
Very Low Frequency ◽  
Significant Difference ◽  
Before And After

The aim of our study is to measure very low frequency band (VLF), low frequency band (LF) and high frequency band (HF) components of R-R interval during orthostatic experiment in panic disorder patients before and after treatment.MethodsWe assessed heart rate variability in 19 patients with panic disorder before and after 6-weeks treatment with antidepressants combined with CBT and 18 healthy controls. They were regularly assessed on the CGI, BAI and BDI. Heart rate variability was assessed during 5 min standing, 5 min supine and 5 min standing positions before and after the treatment. Power spectra were computed using a fast Fourier transformation for very low frequency - VLF (0.0033 - 0.04 Hz), low-frequency - LF (0.04-0.15 Hz) and high frequency - HF (0.15-0.40 Hz) powers.Results19 panic disorder patients entered a 6-week open-label treatment study with combination of SSRI and cognitive behavioral therapy. A combination of CBT and pharmacotherapy proved to be the effective treatment of patients. They significantly improved in all rating scales. There were highly statistical significant differences between panic patients and control group in all components of power spectral analysis in 2nd and in two component of 3rd (LF and HF in standing) positions. There was also statistically significant difference between these two groups in LF/HF ratio in supine position (2nd). During therapy there was tendency to increasing values in all three positions in components of HRV power spectra, but there was only statistically significant increasing in HF1 component.Supported by project IGA MZ ČR NS 10301-3/2009

scholarly journals FREQUENCY ANALYSIS OF CARDIAC DATA OBTAINED THROUGH HOLTER MONITORING IN REAL LIVING CONDITIONS

2019 ◽  
Vol 7 ◽  
pp. 870-874
Author(s):  
Galya Nikolova Georgieva-Tsaneva
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
High Frequency ◽  
Scientific Literature ◽  
Real Life ◽  
Low Frequency ◽  
Holter Monitoring ◽  
Heart Rate Variability Analysis ◽  
Healthy Individuals ◽  
Spectral Parameters

The paper presents frequency methods for estimating the variability of intervals between individual heart beats in Electrocardiogram. This parameter is known in the scientific literature as the Heart Rate Variability and with this method it is possible to make predictions about human health. Three frequency ranges have been studied: Very Low Frequency, Low Frequency, and High Frequency. The study in this paper was based on real cardiological data obtained from 33 patients suffering from heart fibrillations and 29 healthy individuals. The investigated records are obtained through a Holter monitoring of studied individuals in real life conditions. The obtained results show significantly lower values ​​of the tested spectral parameters in the diseased individuals compared to the healthy controls. The accomplished study shows the effective applicability of the spectral methods of Heart Rate Variability analysis and the possibility of differentiation by the spectral parameters of the patients from healthy individuals.

scholarly journals MRI-related anxiety in healthy individuals, intrinsic BOLD oscillations at 0.1 Hz in precentral gyrus and insula, and heart rate variability in low frequency bands

PLoS ONE ◽  
2018 ◽  
Vol 13 (11) ◽  
pp. e0206675 ◽  
Author(s):  
Gert Pfurtscheller ◽  
Andreas Schwerdtfeger ◽  
David Fink ◽  
Clemens Brunner ◽  
Christoph Stefan Aigner ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Low Frequency ◽  
Precentral Gyrus ◽  
Healthy Individuals ◽  
Frequency Bands

The Relationship Between Spectral Changes in Heart Rate Variability and Fatigue

2009 ◽  
Vol 23 (3) ◽  
pp. 143-151 ◽  
Author(s):  
Yvonne Tran ◽  
Nirupama Wijesuriya ◽  
Mika Tarvainen ◽  
Pasi Karjalainen ◽  
Ashley Craig
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Low Frequency ◽  
Chronic Fatigue ◽  
Common Symptom ◽  
Healthy Individuals ◽  
Spectral Changes ◽  
Fatigue Syndrome ◽  
Experienced Fatigue ◽  
Sympathetic Arousal

Fatigue is a prevalent problem in the workplace and a common symptom of many diseases. However, its relationship with the autonomic nervous system, specifically with sympathetic arousal, needs clarification. The objective of this study was to determine the association between fatigue and heart rate variability (HRV). HRV is regarded as an indicator of the autonomic regulation activity of heart rate, specifically sympathetic and parasympathetic activity. Spectral changes in low-frequency (LF; 0.04–0.15 Hz) and high-frequency (HF; 0.15–0.4 Hz) components of HRV have been reported to be associated with distressing conditions such as hemorrhagic shock, acute myocardial infarction, elevated anxiety, and depressed mood. While HRV changes have been found in persons with chronic fatigue syndrome, its association with fatigue in healthy individuals still needs clarification. HRV was assessed in a total of 50 participants who were asked to perform a task until becoming fatigued. Low-frequency HRV activity increased, while indices of parasympathetic modulation such as RMSSD and pNN50 remained stable as participants experienced fatigue, suggesting that fatigue in healthy individuals may be associated with increased sympathetic arousal. In addition, employing multiple regression analyses, we could positively associate the change in LF/HF HRV ratio from baseline to fatigue with factors such as emotional stability, warmth and tension and negatively associate it with social boldness and self-reported levels of vigor.

scholarly journals Clinical significance of heart rate variability and Q-T interval duration during Holter monitoring of ECG in patients with essential hypertension

2004 ◽  
Vol 10 (1) ◽  
pp. 39-42
Author(s):  
A. V. Shabalin ◽  
Ye. N. Gulyaeva ◽  
Ye. Ye. Torochkina ◽  
E. M. Verkoshanskaya ◽  
O. V. Kovalenko ◽  
...  
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Essential Hypertension ◽  
Clinical Significance ◽  
Comparison Group ◽  
Low Frequency ◽  
Holter Monitoring ◽  
Total Power ◽  
Interval Duration ◽  
Healthy Individuals

The clinical significance of heart rate variability and Q-T interval duration during 24-hour bifunctional monitoring of ECG and blood pressure (BP) was studied in 81 patients aged 22-58 years (mean 41,40±0,72 years) who had Stages I-III essential hypertension (EH). A comparison group included 20 healthy individuals. Temporary and spectral methods were used to assess the parameters of heart rate variability; 24-hour Q-Tand O-Tk intervals, as well as echocardiographic data were analyzed. Patients with Stages I-III EH were ascertained to have a progressive decrease in diurnal heart rate variability along with a reduction in the total power of the spectrum, in the power of low-frequency constituents, and in their ratio. EH progression was found to be associated with an increase in the duration of the Q-T interval, its corrected values during daylight hours and with the degree of heart rate variability without circadian changes. The degree of autonomous cardiac control was statistically significantly related to heart rate variability and a risk for ventricular repolarization disorders.

Sign in / Sign up

Export Citation Format

Share Document