Changes in Blood Pressure and Heart Period Variability in Patients with Recent Acute Myocardial Infarction

1996 ◽  
Vol 91 (s1) ◽  
pp. 52-55 ◽  
Author(s):  
Attila Kardos ◽  
Laszlo Halmai ◽  
Laszlo Rudas ◽  
Miklos Csanady
Keyword(s):  
Myocardial Infarction ◽  
Blood Pressure ◽  
Acute Myocardial Infarction ◽  
Heart Period ◽  
Heart Period Variability ◽  
Period Variability ◽  
Recent Acute Myocardial Infarction

scholarly journals Recovery of 24-hour heart period variability after acute myocardial infarction

1991 ◽  
Vol 17 (2) ◽  
pp. A66
Author(s):  
J.Thomas Bigger ◽  
Richard C. Steinman ◽  
Joseph L. Fleiss ◽  
Rinda M. Rolnitzky
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Heart Period ◽  
Heart Period Variability ◽  
Period Variability

Correlations among time and frequency domain measures of heart period variability two weeks after acute myocardial infarction

1992 ◽  
Vol 69 (9) ◽  
pp. 891-898 ◽  
Author(s):  
J.Thomas Bigger ◽  
Joseph L. Fleiss ◽  
Richard C. Steinman ◽  
Linda M. Rolnitzky ◽  
Robert E. Kleiger ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Acute Myocardial Infarction ◽  
Frequency Domain ◽  
Heart Period ◽  
Heart Period Variability ◽  
Period Variability

Effects of Fear Induction on Heart Period Variability

1999 ◽  
Vol 13 (1) ◽  
pp. 18-26 ◽  
Author(s):  
Rudolf Stark ◽  
Alfons Hamm ◽  
Anne Schienle ◽  
Bertram Walter ◽  
Dieter Vaitl
Keyword(s):  
Blood Pressure ◽  
Trait Anxiety ◽  
State Anxiety ◽  
Self Report ◽  
Emotional States ◽  
Heart Period ◽  
Experimental Conditions ◽  
Heart Period Variability ◽  
Physiological Variables ◽  
Period Variability

Abstract The present study investigated the influence of contextual fear in comparison to relaxation on heart period variability (HPV), and analyzed differences in HPV between low and high anxious, nonclinical subjects. Fifty-three women participated in the study. Each subject underwent four experimental conditions (control, fear, relaxation, and a combined fear-relaxation condition), lasting 10 min each. Fear was provoked by an unpredictable aversive human scream. Relaxation should be induced with the aid of verbal instructions. To control for respiratory effects on HPV, breathing was paced at 0.2 Hz using an indirect light source. Besides physiological measures (HPV measures, ECG, respiration, forearm EMG, blood pressure), emotional states (pleasure, arousal, dominance, state anxiety) were assessed by subjects' self-reports. Since relaxation instructions did not have any effect neither on the subjective nor on the physiological variables, the present paper focuses on the comparison of the control and the fear condition. The scream reliably induced changes in both physiological and self-report measures. During the fear condition, subjects reported more arousal and state anxiety as well as less pleasure and dominance. Heart period decreased, while EMG and diastolic blood pressure showed a tendency to increase. HPV remained largely unaltered with the exception of the LF component, which slightly decreased under fear induction. Replicating previous findings, trait anxiety was negatively associated with HPV, but there were no treatment-specific differences between subjects with low and high trait anxiety.

Short-term variability of blood pressure and heart rate in Guillain-Barreá syndrome without respiratory failure

1999 ◽  
Vol 96 (6) ◽  
pp. 613-621 ◽  
Author(s):  
Djillali ANNANE ◽  
Véronique BAUDRIE ◽  
Anne-Sophie BLANC ◽  
Dominique LAUDE ◽  
Jean-Claude RAPHAËL ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Respiratory Failure ◽  
Plasma Noradrenaline ◽  
Heart Period ◽  
Short Term ◽  
Heart Period Variability ◽  
Period Variability ◽  
Head Up Tilt ◽  
Short Term Variability

The effect of Guillain-Barré syndrome (GBS) on the short-term variability of blood pressure and heart rate was evaluated in six patients presenting with a moderate form of the syndrome, i.e. unable to stand up unaided and without respiratory failure, at the height of the disease and during recovery. The patients were compared with six age-matched healthy volunteers. During the acute phase of the syndrome, GBS patients exhibited a significant heart rate elevation (+26 beats/min compared with healthy subjects), but the acceleratory response to atropine, or to 60 ° head-up tilt, was maintained. Resting plasma noradrenaline levels were high in acute GBS, but the secretory response to tilt was preserved. Desensitization to noradrenaline was observed in acute GBS with a reduced pressor action of this α-adrenoceptor agonist. Blood pressure levels were normal and head-up tilt did not induce orthostatic hypotension in this moderate form of GBS. Power spectral analysis demonstrated marked alterations in cardiovascular variability. The overall heart period variability was markedly reduced with the reduction predominantly in the high-frequency (respiratory) range (-73%). The low-frequency component of heart period variability was also reduced (-54%). This cardiovascular profile of moderate GBS at the height of the disease could result from a demyelination of the reflex loop controlling respiratory oscillations in heart rate and from a desensitization of the arterial tree to an elevated plasma noradrenaline. Sympathetic nervous activation may contribute to the high resting heart rate in acute GBS.

scholarly journals Frequency domain measures of heart period variability and mortality after myocardial infarction.

Circulation ◽  
1992 ◽  
Vol 85 (1) ◽  
pp. 164-171 ◽  
Author(s):  
J T Bigger ◽  
J L Fleiss ◽  
R C Steinman ◽  
L M Rolnitzky ◽  
R E Kleiger ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Frequency Domain ◽  
Heart Period ◽  
Heart Period Variability ◽  
Period Variability

scholarly journals Deriving heart period variability from blood pressure waveforms

2003 ◽  
Vol 95 (4) ◽  
pp. 1431-1438 ◽  
Author(s):  
Paula S. McKinley ◽  
Peter A. Shapiro ◽  
Emilia Bagiella ◽  
Michael M. Myers ◽  
Ronald E. De Meersman ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Healthy Adults ◽  
International Standards ◽  
Heart Period ◽  
Heart Period Variability ◽  
Period Variability ◽  
Blood Pressure Waveform ◽  
Stress Study ◽  
Speech Presentation

International standards for calculating heart period variability (HPV) from a series of R-wave intervals (R-R) in an electrocardiographic (ECG) recording have been widely accepted. It is possible, and potentially useful in various settings, to use systolic blood pressure waveform intervals to estimate HPV, but the validity of HPV derived from blood pressure (BP) waveforms has not been established. To test the reliability between BP- and ECG-derived HPV indexes, we evaluated data from 234 healthy adults in four studies of HPV reactivity to stress. Study conditions included resting baseline, arithmetic, Stroop test, speech presentation, and orthostatic tilt. Continuous ECG and BP recordings were sampled at a rate of 500 Hz, scored by the same methods, and used to calculate heart rate and time- and frequency-domain measures of HPV. Overall, reliability between the two methods was very high for computing heart rate and HPV indexes. High-frequency HPV indexes were somewhat less reliably computed. In conclusion, in healthy adults, with the use of appropriate methods, BP waveforms can produce reliable indexes of HPV.

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