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Hemodynamic Effect of Pulmonary Artery Ligation during Pneumonectomy
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Kwang Ho Lee, Hyun Kyo Lim, Eun Sung Jun, Young Bok Lee, Kyung Bong Yoon, Jae Chan Choi, Soon Yul Kim, Ryung Choi
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Korean J Crit Care Med. 2000;15(2):88-92.
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 Abstract
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- BACKGROUND
Pulmonary artery ligation during pneumonectomy increase the pulmonary blood flow of dependent lung and may increase the pulmonary arterial pressure and pulmonary vascular resistance. The purpose of this study is to evaluate the hemodynamic effect of pulmonary artery ligation during pneumonectomy.
METHODS
Nine patients who were supposed to receive pneumonectomy were studied. Hemodynamic measurements were performed following two lung ventilation (TLV), one lung ventilation (OLV), after pulmonary artery ligation and after pneumonectomy.
RESULTS
There is no significant differences in heart rate, systemic arterial pressure, pulmonary arterial pressure, pulmonary capillary wedge pressure, cardiac index and pulmonary vascular resistance index. Arterial oxygen tension significantly reduced during OLV and increased after pulmonary artery ligation and after pneumonectomy.
CONCLUSIONS
These results suggest that pulmonary artery ligation during pneumonectomy may not affect the cardiopulmonary hemodynamics.
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Comparison of Initial Weaning Success Rates and Weaning Periods between Synchronized Intermittent Mandatory Ventilation and Pressure Support Ventilation
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Joong Hyuk Yang, Kyoung Min Lee, Hyun Kyung Lim, Dae Ja Um, Ryung Choi
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Korean J Crit Care Med. 1997;12(1):31-36.
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Abstract
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- BACKGOUND: SIMV (synchronized intermittent mandatory ventilation) mode is comprised of a ventilator that intermittently enters the volume assist/control mode in conjunction with circuitry that allows for spontaneous ventilation by a demand flow system. There is additional work of breathing caused by the endotracheal tube and demand valve in SIMV. However, PSV (pressure support ventilation) has the ability to decrease work of breathing and to augment spontaneous breaths with a variable amount of inspiratory positive pressure with a clinician-selected level of inspiratory airway pressure.
METHODS
To compare the initial weaning success rates and weaning periods between SIMV and PSV, we reviewed medical records of 103 intensive care unit patients, who had received mechanical ventilatory support and performed weaning. We compared the patients' characteristics, initial weaning success rates and ventilatory periods, weaning periods, weaning periods/ventilatory periods, ICU stays according to the weaning process (SIMV and PSV). And then we compared the same variables as the above between the initial weaning success group and initial weaning failure group.
RESULTS
Patients' characteristics, ventilatory periods, weaning periods, ICU stays were similar, but there was significantly shorter weaning periods/ventilatory periods on PSV group. Initial weaning success rates according to the weaning process were similar. Ventilatory periods, weaning periods, weaning periods/ventilatory periods, ICU stays were significantly shorter on initial weaning success group.
CONCLUSIONS
PSV could be used effectively as one of the weaning modes, and further studies are required about weaning criteria, weaning start time and weaning methods.
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