Electrocardiographic Autonomic Function Measures in Mechanically Ventilated Patients
This research proposal has two main objectives. The first is to increase understanding of the underlying physiological interactions that occur between the cardiovascular, pulmonary, and ANS during transition between positive pressure mechanical ventilation (MV) and spontaneous breathing. The second is to determine if heart rate variability, (HRV) a reflection of autonomic nervous system (ANS) activity, and autonomic information flow (AIF), a set of nonlinear measures derived from HRV, both measured in the intensive care unit (ICU) can predict patient outcomes including successful weaning and in-hospital recovery time after an episode of cardiopulmonary compromise requiring MV.
Hypothesis 1. Transitions between mechanically supported ventilation and spontaneous breathing will disturb cardiovascular synchrony, altering the relationship of HRV, AIF, respiratory rate, and blood pressure;
Hypothesis 2. More normal HRV and AIF values, measured during baseline MV and sedation awakening (a period immediately prior to SBT when sedative medications are discontinued) will be associated with easier weaning, and shorter intensive care unit (ICU) and hospital lengths of stay; more abnormal measurements will be associated with longer lengths of stay;
Hypothesis 3. AIF is a more sensitive predictor of successful weaning from MV than HRV.
Disorders of the Autonomic Nervous System
|Study Design:||Observational Model: Cohort|
|Official Title:||The Value of Electrocardiographic Autonomic Nervous System Function Measures for Predicting Cardiopulmonary Recovery of Mechanically Ventilated Patients in Intensive Care|
Please refer to this study by its ClinicalTrials.gov identifier: NCT00844935
|United States, California|
|University of California, San Francisco Medical Center|
|San Francisco, California, United States, 94122|
|Principal Investigator:||Barbara Drew, PhD||University of California, San Francisco|