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Autonomic Tone in Medical Intensive Care Patients Receiving Mechanical Ventilation and During a CPAP Weaning Trial
Susan K. Frazier, PhD, RN
University of Kentucky College of Nursing, Lexington, Kentucky, skfraz2{at}email.uky.edu
Debra K. Moser, DNSc, RN, FAAN
University of Kentucky College of Nursing, Lexington, Kentucky
Rebecca Schlanger, MS, RN, CNP
Ohio State University College of Nursing, Columbus, Ohio
Jeanne Widener, MS, RN
Ohio State University College of Nursing, Columbus, Ohio
Lauren Pender, MS, RN
Ohio State University College of Nursing, Columbus, Ohio
Kathleen S. Stone, PhD, RN, FAAN
Ohio State University College of Nursing, Columbus, Ohio
Mechanical ventilator support and the resumption of spontaneous ventilation or weaning create significant alterations in alveolar and intrathoracic pressure that influence thoracic blood volume and flow. Compensatory autonomic tone alterations occur to ensure adequate tissue oxygen delivery, but autonomic responses may produce cardiovascular dysfunction with subsequent weaning failure. The authors describe autonomic responses of critically ill patients (n = 43) during a 24-hr period of mechanical ventilatory support and during the 24 hr that included their initial spontaneous breathing trial using continuous positive airway pressure. Nearly two thirds of these patients demonstrated abnormal autonomic function and this dysfunction was more severe in those patients who were unable to sustain spontaneous ventilation (n = 15). With further systematic study, autonomic responses may be useful in the identification of patients who are likely to develop cardiac dysfunction with the resumption of spontaneous breathing.
Key Words: mechanical ventilation catecholamines heart rate variability autonomic tone
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Biological Research For Nursing, Vol. 9, No. 4,
301-310 (2008)
DOI: 10.1177/1099800408314707

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