Depressed cardiac autonomic modulation in patients with chronic kidney disease.
| Autor: | de Oliveira CA; School of Medical and Health Sciences of Juiz de Fora., de Brito Junior HL; Medical School, University of São Paulo., Bastos MG; Federal University of Juiz de Fora., de Oliveira FG; Dante Pazzanese Institute of Cardiology., Casali TG; Federal University of Minas Gerais., Bignoto TC; Dante Pazzanese Institute of Cardiology., Fernandes NM; Federal University of Juiz de Fora., Beraldo AF; Federal University of Juiz de Fora., de Paula RB; Federal University of Juiz de Fora. |
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| Jazyk: | English; Portuguese |
| Zdroj: | Jornal brasileiro de nefrologia : 'orgao oficial de Sociedades Brasileira e Latino-Americana de Nefrologia [J Bras Nefrol] 2014 Apr-Jun; Vol. 36 (2), pp. 155-62. |
| DOI: | 10.5935/0101-2800.20140025 |
| Abstrakt: | Introduction: A dysfunctional autonomic nervous system (ANS) has also been recognized as an important mechanism contributing to the poor outcome in CKD patients, with several studies reporting a reduction in heart rate variability (HRV). Objective: Evaluate the sympathovagal balance in patients with chronic kidney disease on conservative treatment. Methods: In a cross-sectional study, patients with CKD stages 3, 4 and 5 not yet on dialysis (CKD group) and age-matched healthy subjects (CON group) underwent continuous heart rate recording during two twenty-minute periods in the supine position (pre-inclined), followed by passive postural inclination at 70° (inclined period). Power spectral analysis of the heart rate variability was used to assess the normalized low frequency (LFnu), indicative of sympathetic activity, and the normalized high frequency (HFnu), indicative of parasympathetic activity. The LFnu/HFnu ratio represented sympathovagal balance. Results: After tilting, CKD patients had lower sympathetic activity, higher parasympathetic activity, and lower sympathovagal balance than patients in the CON group. Compared to patients in stage 3, patients in stage 5 had a lower LFnu/HFnu ratio, suggesting a more pronounced impairment of sympathovagal balance as the disease progresses. Conclusion: CKD patients not yet on dialysis have reduced HRV, indicating cardiac autonomic dysfunction early in the course of CKD. |
| Databáze: | MEDLINE |
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