Heart rate variability in spontaneously breathing and mechanically ventilated patients

2003 ◽  
Author(s):  
A.A. Bharath ◽  
P. Mendel ◽  
R.I. Kitney ◽  
R. Langford
Keyword(s):  
Heart Rate ◽  
Heart Rate Variability ◽  
Mechanically Ventilated ◽  
Mechanically Ventilated Patients ◽  
Spontaneously Breathing ◽  
Ventilated Patients

Psychophysiologic responses of mechanically ventilated patients to music: a pilot study

1995 ◽  
Vol 4 (3) ◽  
pp. 233-238 ◽  
Author(s):  
LL Chlan
Keyword(s):  
Heart Rate ◽  
Respiratory Rate ◽  
Repeated Measures ◽  
Mood States ◽  
Profile Of Mood States ◽  
Music Listening ◽  
Mechanically Ventilated ◽  
Mechanically Ventilated Patients ◽  
Over Time ◽  
Ventilated Patients

BACKGROUND: Although mechanically ventilated patients experience numerous stressors, they have not been included in music therapy stress reduction and relaxation studies. OBJECTIVE: To examine selected psychophysiologic responses of mechanically ventilated patients to music. METHODS: A two-group experimental design with pretest, posttest, and repeated measures was used. Twenty mechanically ventilated patients were randomized to a music-listening group or a nonmusic (headphones only) group. Physiologic dependent measures--heart rate and rhythm, respiratory rate, systolic and diastolic blood pressure, oxygen saturation, and airway pressure--were collected at timed intervals. Psychologic data were collected before and after intervention using the Profile of Mood States. RESULTS: Using repeated measures analysis of variance, results for heart rate and respiratory rate over time and over time between groups were significant. Between-group differences were significant for respiratory rate. Significant differences were found via t test for the music group's Profile of Mood States scores. No adverse cardiovascular responses were noted for either group. CONCLUSIONS: Data indicated that music listening decreased heart rate, respiratory rate, and Profile of Mood States scores, indicating relaxation and mood improvement.

Heliox

2007 ◽  
pp. 279-282
Keyword(s):  
Airway Obstruction ◽  
Acute Asthma ◽  
Upper Airway ◽  
Upper Airway Obstruction ◽  
Mechanically Ventilated ◽  
Mechanically Ventilated Patients ◽  
Spontaneously Breathing ◽  
Respiratory Emergencies ◽  
Ventilated Patients

Heliox 280 Helium–oxygen (heliox) mixtures were first described in the 1930s for the management of respiratory emergencies. In the last 20 years heliox has gained more widespread use. It has a role in the temporary management of upper airway obstruction and there is renewed interest in its use in acute asthma and COPD in both spontaneously breathing and mechanically ventilated patients....

Breathing cardiovascular variability and baroreflex in mechanically ventilated patients

2008 ◽  
Vol 295 (6) ◽  
pp. R1934-R1940 ◽  
Author(s):  
Andry Van de Louw ◽  
Claire Médigue ◽  
Yves Papelier ◽  
François Cottin
Keyword(s):  
Blood Pressure ◽  
Heart Rate ◽  
Phase Difference ◽  
Airway Pressure ◽  
Baroreflex Sensitivity ◽  
Positive Pressure ◽  
Signal Phase ◽  
Mechanically Ventilated ◽  
Mechanically Ventilated Patients ◽  
Ventilated Patients

Heart rate and blood pressure variations during spontaneous ventilation are related to the negative airway pressure during inspiration. Inspiratory airway pressure is positive during mechanical ventilation, suggesting that reversal of the normal baroreflex-mediated pattern of variability may occur. We investigated heart rate and blood pressure variability and baroreflex sensitivity in 17 mechanically ventilated patients. ECG (RR intervals), invasive systolic blood pressure (SBP), and respiratory flow signals were recorded. High-frequency (HF) amplitude of RR and SBP time series and HF phase differences between RR, SBP, and ventilatory signals were continuously computed by Complex DeModulation (CDM). Cross-spectral analysis was used to assess the coherence and the gain functions between RR and SBP, yielding baroreflex sensitivity indices. The HF phase difference between SBP and ventilatory signals was nearly constant in all patients with inversion of SBP variability during the ventilator cycle compared with cycling with negative inspiratory pressure to replicate spontaneous breathing. In 12 patients ( group 1), the phase difference between RR and ventilatory signals changed over time and the HF-RR amplitude varied. In the remaining five patients ( group 2), RR-ventilatory signal phase and HF-RR amplitude showed little change; however, only one of these patients exhibited a RR-ventilatory signal phase difference mimicking the normal pattern of respiratory sinus arrhythmia. Spectral coherence between RR and SBP was lower in the group with phase difference changes. Positive pressure ventilation exerts mainly a mechanical effect on SBP, whereas its influence on HR variability seems more complex, suggesting a role for neural influences.

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