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Biomedical subjects

K A Sotaniemi

Publications and source records attributed to K A Sotaniemi.

At least 19 recordsLinked to original sources
PubMed2004

Heart rate dynamics predict poststroke mortality.

BACKGROUND: Impaired cardiovascular autonomic regulation assessed by heart rate (HR) variability provides prognostic information in patients with heart disease as well as among elderly. Reduced HR variability has been described in stroke patients, but the prognostic significance of HR variability measures after stroke has not been studied. METHODS: A series of 84 patients (mean age 59 +/- 12 years) with an acute first-ever ischemic stroke underwent a comprehensive clinical investigation, laboratory tests, and 24-hour EKG recordings and were followed up for 7 years (mean 83 +/- 54 months). Various conventional and newer qualitative measures of HR variability were analyzed from the baseline 24-hour EKG. Risk factors for all-cause mortality were assessed. RESULTS: During the follow-up, 33 (39%) patients died and 51 survived. Among all the variables analyzed, abnormal long-term HR variability measure power-law slope beta (beta < -1.5), reflecting an altered distribution of spectral characteristics over ultra and very low frequency bands, was the best univariate predictor of death (hazard ratio 4.5, 95% CI 2.2 to 9.5, p < 0.001). High age, poor Scandinavian Stroke Scale score, and abnormal short-term HR variability scaling measure (alpha) also predicted mortality in univariate analysis. In multivariate analysis, after adjustment for age, the only independent predictor of the risk of death was abnormal long-term power-law slope beta (hazard ratio 3.8, CI 1.8 to 8.2, p < 0.001). Conventional HR variability measures showed no prognostic power. CONCLUSION: Abnormal long-term HR dynamics predict poststroke mortality. This measure may have value in the risk stratification of stroke patients.

Aged↗
PubMed2004

The generic 15D instrument is valid and feasible for measuring health related quality of life in Parkinson's disease.

OBJECTIVES: To test the validity and feasibility of the generic 15D health related quality of life (HRQoL) instrument in Parkinson's disease (PD) and compare parkinsonian patients with the general population. Much effort has gone into developing disease specific HRQoL measures for PD, but only generic measures allow comparisons with the general population. New HRQoL tools are needed for PD because earlier ones have low feasibility in elderly patients. METHODS: The study comprised 260 patients with idiopathic PD and age and sex matched controls. HRQoL was evaluated using the disease specific questionnaire PDQ-39 and the 15D generic instrument. PD severity was assessed by Hoehn and Yahr staging, and the activities of daily living (ADL) and motor section of the Unified Parkinson's Disease Rating Scale (UPDRS). RESULTS: The mean 15D score (scale 0-1; overall HRQoL) was lower in PD (0.77) than in controls (0.86). Patients with PD had significantly lower scores than controls in 13 of the 15 dimensions of 15D. Scores of the corresponding dimensions of PDQ-39 and 15D correlated significantly, confirming the convergent validity of 15D. In multiple stepwise regression analysis, the UPDRS ADL score explained 55% of the variation in the 15D score. CONCLUSIONS: 15D is a valid, feasible, and sensitive tool to assess quality of life in PD. PD has a major impact on HRQoL, which is related to disease progression. Mobility, eating, speech, and sexual functions are most affected. The ADL measure of the UPDRS and the 15D provide an easily assessable view of HRQoL in PD.

Aged↗
PubMed2002

Comparison of heart rate variability analysis methods in patients with Parkinson's disease.

The aim of the present study was to evaluate different analysis methods for revealing heart rate variability (HRV) differences between untreated patients with Parkinson's disease and healthy controls. HRV in standard cardiovascular reflex tests and during a 10 min rest period were measured by time- and frequency-domain and geometrical and non-linear analysis methods. Both frequency- and time-domain measures revealed abnormal HRV in the patients, whereas non-linear and geometrical measures did not. The absolute high-frequency spectral power of HRV was the strongest independent predictor to separate the patients from the controls (p = 0.001), when the main time-domain and absolute frequency-domain measures were compared with each other. When the corresponding normalised spectral units, instead of the absolute units, were used in the comparison, the two best single measures for separating the groups were the 30/15 ratio of the tilting test (p = 0.003) and the max/min ratio during deep breathing (p = 0.024). When the correlations between the different measures were estimated, the time-domain measures, fractal dimension and absolute spectral powers correlated with each other. The frequency- and time-domain analysis techniques of stationary short-term HRV recordings revealed significant differences in cardiovascular regulation between untreated patients with Parkinson's disease and the controls. This confirms cardiovascular regulation failure before treatment in the early stages of Parkinson's disease. The HRV spectral powers, in absolute units, were the most effective single parameters in segregating the two groups, emphasising the role of spectral analysis in the evaluation of HRV in Parkinson's disease.

Adult↗
PubMed2001

[123I]beta-CIT SPECT demonstrates decreased brain dopamine and serotonin transporter levels in untreated parkinsonian patients.

Striatal dopamine transporters (DATs) and serotonin transporters (SERTs) were evaluated in untreated patients with Parkinson's disease (PD) and controls using single-photon emission computed tomography (SPECT) with 2beta-carboxymethoxy-3beta-(4-iodophenyl)tropane ([123I]beta-CIT). The striatal DAT specific to non-displaceable uptake ratios of 29, and the SERT uptake measurements of 27, PD patients were compared with those of 21 and 16 controls, respectively. The results were correlated with Unified Parkinson's Disease Rating Scale (UPDRS) scores, the Hoehn & Yahr stage, age, duration of the disease, and the major PD signs. The specific DAT binding in the caudate, the putamen and the caudate/putamen ratio were measured. In all of the PD patients the striatal uptake values were bilaterally reduced, being 36.9% (P < 0.001) lower than those of the controls. In the hemiparkinsonian patients the reduction was greater on the side contralateral to the initial symptoms (33.3% vs. 27.8%) and the uptake ratios indicated a more pronounced deficit in the putamen (39.1%) than in the caudate (27.9%). The DAT uptake correlated with the UPDRS total score and activities of daily living (ADL) and motor subscores, the Hoehn & Yahr stage, and rigidity score. PD patients had significantly higher caudate to putamen ratios than the controls. In the PD patients the SERT values were lower in the thalamic and frontal regions. The SERT uptake ratio of the frontal area correlated with the UPDRS subscore I. [123I]beta-CIT SPECT provides a useful method for confirming the clinical diagnosis of PD with correlation to disease severity. Additionally, this technique allows the simultaneous measurement of SERT uptake and shows that PD patients, interestingly, seem to have decreased SERT availability in the thalamic and frontal areas.

Adult↗
PubMed2001

Ambulatory ECG and analysis of heart rate variability in Parkinson's disease.

OBJECTIVES: Cardiovascular reflex tests have shown both sympathetic and parasympathetic failure in Parkinson's disease. These tests, however, describe the autonomic responses during a restricted time period and have great individual variability, providing a limited view of the autonomic cardiac control mechanisms. Thus, they do not reflect tonic autonomic regulation. The aim was to examine tonic autonomic cardiovascular regulation in untreated patients with Parkinson's disease. METHODS: 24 Hour ambulatory ECG was recorded in 54 untreated patients with Parkinson's disease and 47 age matched healthy subjects. In addition to the traditional spectral (very low frequency, VLF; low frequency, LF; high frequency, HF) and non-spectral components of heart rate variability, instantaneous beat to beat variability (SD1) and long term continuous variability (SD2) derived from Poincaré plots, and the slope of the power law relation were analysed. RESULTS: All spectral components (p<0.01) and the slope of the power-law relation (p<0.01) were lower in the patients with Parkinson's disease than in the control subjects. The Unified Parkinson's disease rating scale total and motor scores had a negative correlation with VLF and LF power spectrum values and the power law relation slopes. Patients with mild hypokinesia had higher HF values than patients with more severe hypokinesia. Tremor and rigidity were not associated with the HR variability parameters. CONCLUSIONS: Parkinson's disease causes dysfunction of the diurnal autonomic cardiovascular regulation as demonstrated by the spectral measures of heart rate variability and the slope of the power law relation. This dysfunction seems to be more profound in patients with more severe Parkinson's disease.

Aged↗
PubMed2000

Suppressed sympathetic skin response in Parkinson disease.

The sympathetic skin response (SSR) was used to evaluate sympathetic sudomotor activity in Parkinson disease (PD) and the effects of antiparkinsonian medication on the disease. We recorded SSRs to electric and auditory stimulation in 58 untreated patients with PD and in 20 healthy controls. In addition to amplitude and latency measurements, we examined the number of SSRs evoked by a single stimulus and the response adaptation after repetitive stimuli. The patients with PD subsequently were randomized for administration of levodopa/ carbidopa (n = 19), bromocriptine (n = 20), or selegiline (n = 19) as their initial treatment. The measurements were repeated after 6 months of medication and after a washout period. SSR amplitudes were significantly lower in patients with PD than in the control subjects at baseline. The amplitude reduction was more pronounced in patients with high Unified Parkinson's Disease Rating Scale scores, in those with high tremor scores, and in those with PD symptoms that had lasted more than 1 year. The levodopa/carbidopa and bromocriptine treatments did not influence SSRs, although selegiline slightly decreased the amplitude. The synchronous responses after a single stimulus were more often repetitive in the patients with PD than in the controls, although the response adaptation tendencies were similar. In conclusion, the degenerative process in PD involves the sudomotor system as reflected by the progressive suppression of SSR amplitudes with a correlation to PD symptom duration and clinical disability, whereas PD medications seems to have only minor effects. The changes in amplitude and the repetitiveness of SSRs with normal adaptation may be caused by deficits at several levels of the SSR reflex arch.

Acoustic Stimulation↗
PubMed2000

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

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.

Aged↗
PubMed2000

Auditory P300 event related potential in minor ischemic stroke.

OBJECTIVE: Various degenerative cerebral diseases and even depression may cause abnormalities of the cognitive event related potentials (ERPs). We conducted the present study to elucidate the effects of ischemic stroke on the P300 ERP component. MATERIAL AND METHODS: We recorded the P300 wave using an auditory oddball paradigm in 38 consecutive brain infarct patients with mild neurological deficits at 3 and 12 months post-stroke, and in 29 healthy control subjects. RESULTS: Brain infarction slightly prolonged the P300 latency, and the observed delay was related to the presence and degree of post-stroke depression evaluated with the Zung Depression Scale and the DSM-III criteria. Infarction did not affect the P300 amplitude or its distribution on the scalp. The results of the patients with hemispheric brain infarction and those of the patients with brainstem infarction were similar, and also the values of the patients with the left- and right-sided lesions. The normal physiological correlation between subject age and the P300 latency was absent at 3 months post-stroke, but was present at 12 months post-stroke. CONCLUSION: Brain infarction delays the P300 ERP and temporarily distorts its age-related physiology. The increase of the P300 latency seems to be associated with the post-stroke depression.

Acute Disease↗
PubMed2000

Domains and determinants of quality of life after stroke caused by brain infarction.

OBJECTIVE: To evaluate the domain-specific quality of life (QOL), including physical, social and role functioning, mental health, vitality, bodily pain, and general health domains, and to assess QOL's clinical and sociodemographic correlates in patients who were disabled by ischemic stroke. DESIGN: One-year prospective study of an inception cohort of patients with first-ever brain infarction. SETTING: Stroke unit of a neurologic department of a university hospital. PATIENTS: Eighty-five consecutive patients (36 women, 49 men; mean age +/- SD, 65+/-12.5 yr) with first-ever stroke of a mild to moderate nature caused by brain infarction. MAIN OUTCOME MEASURES: Patients were examined at 3 and 12 months poststroke. QOL was measured using the RAND 36-Item Health Survey. The variables studied were lateralization of cerebral lesion, neurologic and functional status, depression, age, gender, marital status, and living conditions. Depression was evaluated according to the criteria of Diagnostic and Statistical Manual of Mental Disorders, Revised Third Edition. Neurologic impairment was assessed by Scandinavian Stroke Scale, performance in activities of daily living by the Barthel index, and the intellectual deterioration by the Mini-Mental State Examination. RESULTS: QOL was poorer for the patients with mild to moderate stroke impairments at 3 months poststroke. The test domains most prone to being affected were physical functioning, physical role limitations, vitality, and general health. Only the domains of physical functioning and physical role limitations improved during the follow-up at 1 year. Depression, although mostly minor, was the most important reason for impaired QOL. Depression, being married, and age emerged as significant independent contributors to the low score value of vitality. Depression and being married were related to the low score value of physical role limitations. CONCLUSIONS: Stroke affects QOL, impairing its physical and psychosocial domains. The most important determinants of low QOL seem to be depression and being married. These findings provide new challenges for stroke rehabilitation, calling for identification of patients and spouses in need of supportive services.

Adult↗
PubMed1999

Autonomic nervous system disorders in stroke.

Disturbances of the autonomic nervous system are common in patients with various cerebrovascular diseases. They are attributed to damage of the central autonomic network, particularly in the frontoparietal cortical areas and in the brain stem, or to a disruption of the autonomic pathways descending from the hypothalamus via the mesencephalon, pons, and medulla to the spinal cord. The most common clinical problems include abnormalities in heart rate and blood pressure regulation, reflecting cardiovascular autonomic dysfunction, and asymmetric sweating with cold hemiplegic limbs, reflecting changes in the sudomotor and vasomotor regulatory systems. Bladder and bowel dysfunction and impotence are also frequent complaints after stroke, but the present knowledge concerning their prevalence and clinical significance is still limited. Cardiovascular autonomic dysfunction, which is mainly related to increased sympathetic activity, is most evident in the acute phase of stroke, whereas other autonomic disorders, such as abnormal sweating, are long-standing or even irreversible. In addition to the well-established sympathetic hyperfunction, abnormalities of the parasympathetic nervous system may also contribute to the autonomic imbalance after stroke. Reliable recognition of autonomic dysfunction using quantitative analysis methods is important, because these disturbances are not only subjectively disabling and uncomfortable, but they may also be prognostically unfavorable. Moreover, quantitative measurements also form the ground for successive treatment of various stroke-related autonomic disorders.

Autonomic Nervous System Diseases↗
PubMed1999

Dynamic behavior of heart rate in ischemic stroke.

BACKGROUND AND PURPOSE: Traditional spectral and nonspectral methods have shown that heart rate (HR) variability is reduced after stroke. Some patients with poor outcome, however, show randomlike, complex patterns of HR behavior that traditional analysis techniques are unable to quantify. Therefore, we designed the present study to evaluate the complexity and correlation properties of HR dynamics after stroke by using new analysis methods based on nonlinear dynamics and fractals ("chaos theory"). METHODS: In addition to the traditional spectral components of HR variability, we measured instantaneous beat-to-beat variability and long-term continuous variability analyzed from Poincaré plots, fractal correlation properties, and approximate entropy of R-R interval dynamics from 24-hour ambulatory ECG recordings in 30 healthy control subjects, 31 hemispheric stroke patients, and 15 brain stem stroke patients (8 medullary, 7 pontine) in the acute phase of stroke and 6 months after stroke. RESULTS: In the acute phase, the traditional spectral components of HR variability and the long-term continuous variability from Poincaré plots were impaired (P<0.01) in patients with hemispheric and medullary brain stem stroke, but not in patients with pontine brain stem stroke, in comparison with control subjects. At 6 months after stroke, measures of HR variability in hemispheric stroke patients were still lower (P<0.05) than those of the control subjects. Various complexity and fractal measures of HR variability were similar in patients and control subjects. The conventional frequency domain measures of HR variability as well as the Poincaré measures showed strong correlations (Pearson correlation coefficient, r=0.68 to r=0.90) with each other but only weak correlations (r=0.09 to r=0.56) with the complexity and fractal measures of HR variability. CONCLUSIONS: Hemispheric and medullary brain stem infarctions seem to damage the cardiovascular autonomic regulatory system and appear as abnormalities in the magnitude of HR variability. These abnormalities can be more easily detected with the use of analysis methods of HR variability, which are based on moment statistics, than by methods based on nonlinear dynamics. Abnormal HR variability may be involved in prognostically unfavorable cardiac complications and other known manifestations of autonomic failure associated with stroke.

Acute Disease↗
PubMed1999

Poststroke depression correlates with cognitive impairment and neurological deficits.

BACKGROUND AND PURPOSE: The prevalence of poststroke depression is known to be high, but the knowledge of its neuropsychological correlates is limited. This 12-month prospective study was designed to evaluate the natural history of poststroke depression and to study its neuropsychological, clinical, and functional associates. METHODS: We studied a series of 106 consecutive patients (46 women and 60 men, mean age 65.8 years) with acute first-ever ischemic stroke. The patients underwent a neurological, psychiatric, and neuropsychological examination at 3 and 12 months after the stroke. The psychiatric diagnosis of depression was based on DSM-III-R-criteria. RESULTS: Depression was diagnosed in 53% of the patients at 3 months and in 42% of the patients at 12 months after the stroke. The prevalence of major depression was 9% at 3 months and 16% at 12 months. There was an association between poststroke depression and cognitive impairment; the domains most likely to be defective in stroke-related depression were memory (P=0.022), nonverbal problem solving (P=0.039), and attention and psychomotor speed (P=0.020). The presence of dysphasia increased the risk of major depression. The depressive patients were more dependent in ADL and had more severe impairment and handicap than the nondepressive patients. CONCLUSIONS: More than half of the patients suffer from depression after stroke, and the frequency of major depression seems to increase during the first year. In addition to dysphasia, poststroke depression is correlated with other cognitive deficits. We emphasize the importance of psychiatric evaluation of stroke patients.

Activities of Daily Living↗
PubMed1998

Effect of selegiline on mortality in patients with Parkinson's disease: a meta-analysis.

INTRODUCTION: The Parkinson's Disease Research Group of the United Kingdom (PDRG-UK) reported increased mortality in PD patients treated with levodopa plus selegiline compared with those treated with levodopa alone. METHODS: We performed a meta-analysis on five long-term, prospective, randomized trials of selegiline in patients with untreated PD. Included in the analysis were four randomized, double-blind, placebo-controlled studies and one randomized, double-blind, placebo-controlled study of 2 years' duration followed by long-term, open follow-up. RESULTS: The mean duration of follow-up was 4.1 +/- 1.8 years. There were 14 deaths in 297 selegiline-treated patients (4.7%) and 17 deaths in 292 non-selegiline-treated patients (5.8%). The hazard ratio for mortality was 1.02 (95% CI 0.44 to 2.37; p = 0.96). An analysis restricted to patients receiving only levodopa with or without selegiline noted 11 deaths in 257 levodopa/selegiline-treated patients (4.3%) and 11 deaths in 254 patients treated with levodopa alone (4.3%). The hazard ratio was 1.06 (95% CI 0.44 to 2.55; p = 0.90). Death rate per 1,000 patient years was 11.4 in the selegiline group and 14.2 in the nonselegiline group. Kaplan-Meier survival curves reflecting pooled survival data showed no significant difference in duration of survival. The hazard ratio was 0.84 (95% CI 0.41 to 1.70; p = 0.63) for selegiline- versus non-selegiline-treated patients and 1.05 (95% CI 0.46 to 2.43; p = 0.91) for selegiline/levodopa- versus levodopa-treated patients. CONCLUSION: These results contrast with those of the PDRG-UK study and demonstrate no increase in mortality associated with selegiline treatment whether or not patients also received levodopa.

Aged↗
PubMed1997

Selegiline as the primary treatment of Parkinson's disease--a long-term double-blind study.

INTRODUCTION: To assess the therapeutic efficacy of selegiline combined with levodopa in the long-term treatment of Parkinson's disease (PD). MATERIAL AND METHODS: A randomized, prospective, double-blind study on 44 patients with PD needing levodopa therapy after the initial double-blind treatment with placebo or selegiline was carried out. The patients were followed-up for 5 years under combination therapy. RESULTS: Selegiline induced a significant (P < 0.001) slowing in the need to increase the daily levodopa dose in order to compensate for the progression of the disease. After 5 years of combination therapy the mean dose of levodopa was on average 320 mg lower in the selegiline group (405 +/- 59 mg vs 725 +/- 78 mg). The difference in the levodopa doses between the two groups increased along with follow-up time, as also the ratio of the levodopa doses (placebo/selegiline group). The number of daily levodopa doses needed to compensate for the occurrence of motor fluctuations was significantly lower in the selegiline group. The parkinsonian disability did not differ between the two groups because the clinical condition was kept as optimal as possible by adjusting the levodopa dosage. Nine patients in the placebo group needed initiation of additional dopaminergic therapy in comparison to one in the selegiline group (P = 0.004). During the 5-year follow-up period 11 patients were withdrawn from the selegiline group, 7 due to adverse events. There was no difference in mortality between the two groups. CONCLUSIONS: Selegiline therapy offers beneficial long-term effets in the treatment of PD.

Antiparkinson Agents↗
PubMed1997

Circadian rhythm of heart rate variability is reversibly abolished in ischemic stroke.

BACKGROUND AND PURPOSE: Acute brain infarction significantly decreases heart rate variability as a result of cardiovascular autonomic dysregulation. However, information regarding circadian rhythms of heart rate and heart rate variability is limited. METHODS: In this prospective study, we analyzed 24-hour circadian rhythm of heart rate and the time and frequency domain measures of heart rate variability in 24 patients with hemispheric brain infarction, 8 patients with medullary brainstem infarction, and 32 age- and sex-matched healthy control subjects. ECG data were obtained from the patients in the acute phase and at 6 months after the infarction. RESULTS: In the acute phase of stroke, all the components of heart rate variability, ie, standard deviation of RR intervals, total power, high-frequency power, low-frequency power, and very-low-frequency power, were similar at night (from midnight to 6 AM) and during the day (from 9 AM to 9 PM), indicating that the circadian oscillation of heart rate variability had been abolished. At 6 months after brain infarction, the circadian rhythm had returned and, as in the control subjects, the values at night were significantly higher than those in the daytime. The values in hemispheric and in brainstem infarction did not differ significantly from each other. CONCLUSIONS: These results suggest that circadian fluctuation of heart rate variability is reversibly abolished in the acute phase of ischemic stroke and that it returns during the subsequent 6 months. The loss of the relative vagal nocturnal dominance may contribute to the incidence of cardiac arrhythmias and other cardiovascular complications after acute stroke.

Aged↗
PubMed1996

Abnormal heart rate variability reflecting autonomic dysfunction in brainstem infarction.

OBJECTIVES: Brainstem infarctions frequently cause disturbances of cardiovascular and other autonomic functions, but the pathophysiologic mechanisms of these prognostically unfavourable complications are not well-known. MATERIAL & METHODS: In order to evaluate the effects of ischemic brainstem infarction on autonomic cardiac regulation, we analyzed the power spectrum of heart rate variability in 15 consecutive patients with brainstem infarction and in 15 age- and sex-matched healthy control subjects. The components of the power spectrum which reflect quantitatively both sympathetic and parasympathetic cardiovascular regulatory functions were measured from 24-hour electrocardiogram in the acute phase and at 1 month and 6 months after the infarction. RESULTS: All the measured components of heart rate variability, i.e., total power (p < 0.01), very-low-frequency power (p < 0.001), low-frequency power (p < 0.01), and high-frequency power (p < 0.05), were significantly lower in the patients with medullary brainstem infarction than in the control subjects in the acute phase of the infarction. By 6 months, these abnormalities had been reversed. On the contrary, heart rate variability in pontine brainstem infarct patients did not differ significantly from that in the control subjects. CONCLUSIONS: These results suggest that brainstem infarction located in the medulla oblongata causes cardiovascular autonomic dysregulation manifesting as impaired heart rate variability. Medullary brainstem infarction seems to cause both sympathetic and parasympathetic dysfunction, which may contribute to the occurrence of cardiac complications in stroke.

Adult↗
PubMed1996

Abnormal heart rate variability as a manifestation of autonomic dysfunction in hemispheric brain infarction.

BACKGROUND AND PURPOSE: Abnormal heart rate variability is related to prognostically unfavorable ventricular arrhythmias and sudden arrhythmic death in coronary artery disease. Short-term electrocardiographic (ECG) recordings have shown similar abnormalities of heart rate variability in patients with acute stroke. However, there is no information regarding the clinical significance of these abnormalities and of heart rate variability in long-term ECG recordings in stroke. METHODS: In this prospective study, we analyzed the time domain and frequency domain measures of heart rate variability from 24-hour ECG recordings in 31 consecutive patients with hemispheric brain infarction in the acute phase and at 1 and 6 months after the infarction and in 31 age- and sex-matched healthy control subjects. RESULTS: All the measured components of heart rate variability, ie, standard deviation of RR intervals (P < .001), total power (P < .0001), very-low-frequency power (P < .0001), low-frequency power (P < .001), and high-frequency power (P < .05), were significantly lower than those of the control subjects in both the acute phase and 1 and 6 months later. Impaired heart rate variability correlated with the severity of neurological deficits and disability. In five patients with increased intracranial pressure due to large brain infarction, no relevant spectral components were found. CONCLUSIONS: Hemispheric brain infarction seems to cause significant long-lasting damage to the cardiovascular autonomic regulatory system manifested as abnormalities of heart rate variability. Distorted heart rate variability in the acute phase of stroke may be prognostically unfavorable.

Acute Disease↗