Autonomic dysfunction in COVID-19 patients receiving mechanical ventilation: A cross-sectional study.

Sao Paulo Med J

MD, PhD. Physician and Associate Professor, Programa de Pós-Graduação em Ciências da Saúde (PPGCS), Universidade de Pernambuco (UPE), Recife (PE), Brazil.

Published: April 2023

AI Article Synopsis

  • The study investigates the effects of COVID-19 on heart health in ICU patients on mechanical ventilation, measuring heart rate variability (HRV) as an indicator of cardiac autonomic control.
  • It involved 82 subjects, comparing COVID-19 positive (COVID(+)) and negative (COVID(-)) groups, revealing that both had lower HRV than normal, with the COVID(+) group showing increased low frequency and decreased high frequency HRV components.
  • The findings suggest that reduced HRV, especially in COVID(+) patients, may indicate a higher risk of cardiac complications, underscoring the need for careful monitoring in these patients.

Article Abstract

Background: Coronavirus disease 2019 (COVID-19) can damage cardiac tissue by increasing troponin levels and inducing arrhythmias, myocarditis, and acute coronary syndrome.

Objectives: To analyze the impact of COVID-19 on cardiac autonomic control in mechanically ventilated intensive care unit (ICU) patients.

Design And Setting: This cross-sectional analytical study of ICU patients of both sexes receiving mechanical ventilation was conducted in a tertiary hospital.

Methods: Patients were divided into COVID-19-positive (COVID(+)) and COVID-19-negative (COVID(-)) groups. Clinical data were collected and heart rate variability (HRV) records obtained using a heart rate monitor.

Results: The study sample comprised 82 subjects: 36 (44%) in the COVID(-) group (58.3% female; median age, 64.5 years) and 46 (56%) in the COVID(+) group (39.1% females; median age, 57.5 years). The HRV indices were lower than the reference values. An intergroup comparison identified no statistically significant differences in the mean normal-to-normal (NN) interval, standard deviation of the NN interval, or root mean square of successive differences in NN intervals. The COVID(+) group had an increased low frequency (P = 0.05), reduced high frequency (P = 0.045), and increased low frequency/high frequency (LF/HF) ratio (P = 0.048). There was a weak positive correlation between LF/HF and length of stay in the COVID(+) group.

Conclusion: Patients who received mechanical ventilation had lower overall HRV indices. COVID(+) patients who received mechanical ventilation had lower vagal HRV components. These findings likely indicate clinical applicability, as autonomic control impairments are associated with a greater risk of cardiac death.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10109544PMC
http://dx.doi.org/10.1590/1516-3180.2022.0513.R1.09022023DOI Listing

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