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| Title |
Assessment of Autonomic Function by Phase Rectification of RR-Interval Histogram Analysis in Chagas Disease
|
|---|---|
| Published in |
Arquivos Brasileiros de Cardiologia, January 2015
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| DOI | 10.5935/abc.20150032 |
| Pubmed ID | |
| Authors |
Olivassé Nasario-Junior, Paulo Roberto Benchimol-Barbosa, Roberto Coury Pedrosa, Jurandir Nadal |
| Abstract |
In chronic Chagas disease (ChD), impairment of cardiac autonomic function bears prognostic implications. Phase‑rectification of RR-interval series isolates the sympathetic, acceleration phase (AC) and parasympathetic, deceleration phase (DC) influences on cardiac autonomic modulation. This study investigated heart rate variability (HRV) as a function of RR-interval to assess autonomic function in healthy and ChD subjects. Control (n = 20) and ChD (n = 20) groups were studied. All underwent 60-min head-up tilt table test under ECG recording. Histogram of RR-interval series was calculated, with 100 ms class, ranging from 600-1100 ms. In each class, mean RR-intervals (MNN) and root-mean-squared difference (RMSNN) of consecutive normal RR-intervals that suited a particular class were calculated. Average of all RMSNN values in each class was analyzed as function of MNN, in the whole series (RMSNNT), and in AC (RMSNNAC) and DC (RMSNNDC) phases. Slopes of linear regression lines were compared between groups using Student t-test. Correlation coefficients were tested before comparisons. RMSNN was log-transformed. (α < 0.05). Correlation coefficient was significant in all regressions (p < 0.05). In the control group, RMSNNT, RMSNNAC, and RMSNNDC significantly increased linearly with MNN (p < 0.05). In ChD, only RMSNNAC showed significant increase as a function of MNN, whereas RMSNNT and RMSNNDC did not. HRV increases in proportion with the RR-interval in healthy subjects. This behavior is lost in ChD, particularly in the DC phase, indicating cardiac vagal incompetence. |
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Geographical breakdown
| Country | Count | As % |
|---|---|---|
| Argentina | 1 | 100% |
Demographic breakdown
| Type | Count | As % |
|---|---|---|
| Members of the public | 1 | 100% |
Attention Score in Context
This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 11 January 2016.
All research outputs
#18,434,182
of 22,837,982 outputs
Outputs from Arquivos Brasileiros de Cardiologia
#720
of 1,076 outputs
Outputs of similar age
#255,943
of 353,212 outputs
Outputs of similar age from Arquivos Brasileiros de Cardiologia
#30
of 46 outputs
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So far Altmetric has tracked 1,076 research outputs from this source. They receive a mean Attention Score of 3.2. This one is in the 18th percentile – i.e., 18% of its peers scored the same or lower than it.
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