Baroreflex sensitivity determined by spectral method and heart rate variability, and two-years mortality in patients after myocardial infarction

Title:

Baroreflex sensitivity determined by spectral method and heart rate variability, and two-years mortality in patients after myocardial infarction

Creator:

Nataša Honzíková, Bořivoj Semrád, Fišek, B., and Růžena Lábrová

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:b984271c-77e0-4c60-9847-c22b4c848172
uuid:b984271c-77e0-4c60-9847-c22b4c848172
issn:0862-8408

Subject:

Fyziologie člověka a srovnávací fyziologie, infarkt myokardu, myocardial infarction, baroreflex sensitivity, spectral analysis, cardiac death, risk stratification, 14, and 612

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

Sympathetic overactivity and low parasympathetic activity is an autonomic dysfunction (AD) which enhances cardiac mortality. In the present study, the impact of AD on the mortality in patients after myocardial infarction was evaluated. We examined 162 patients 7-21 days after myocardial infarction, 20 patients of whom died in the course of two years. Baroreflex sensitivity (BRS) was estimated by spectral analysis of spontaneous fluctuations of systolic blood pressure and cardiac intervals (Finapres, 5 min recording, controlled breathing 20/min). The heart rate variability was determined as SDNN index (mean of standard deviations of RR intervals for all 5-min segments of 24-hour ECG recordings). BRS < 3 ms/mm Hg and/or SDNN index < 30 ms were taken as markers of AD. The risk stratification was performed according to the number of the following standard risk factors of increased risk of cardiac mortality (SRF): ejection fraction < 40 %, positive late potentials and the presence of ventricular extrasystoles > 10/h. No difference in mortality between patients with AD (4 %) and without AD (4.5 %) was found in 92 patients without SRF, the mortality in 6 patients with three SRF was 66.6 %. Five of these patients had AD. Out of 64 patients with one or two SRF, 32 had AD. The mortality of patients without AD was 6.25 % and 31.2 % of those with AD (p<0.025). It is concluded that AD enhanced two-years mortality five fold in our patients with moderate risks., N. Honzíková, B. Semrád, B. Fišer, R. Lábrová., and Obsahuje bibliografii

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Physiological research | 2000 Volume:49 | Number:6

Harvested from:

CDK

Metadata only:

false