Abstract:
BACKGROUND:This study aimed to assess cardiac and pulmonary pathophysiological responses during cooling and extracorporeal life support (ECLS) rewarming in a porcine model of deep hypothermic cardiac arrest (DHCA). In addition, we evaluated whether providing a lower flow rate of ECLS during the rewarming phase might attenuate cardiopulmonary injuries. METHODS:Twenty pigs were cannulated for ECLS, cooled until DHCA occurred and subjected to 30 min of cardiac arrest. In order to assess the physiological impact of ECLS on cardiac output we measured flow in the pulmonary artery using Doppler echocardiography as well as a modified thermodilution technique using the Swan-Ganz catheter (injection site in the right ventricle). The animals were randomized into two groups during rewarming: a group with a low blood flow rate of 1.5 L/min (LF group) and a group with a normal flow rate of 3.0 L/min (NF group). The ECLS temperature was adjusted to 5 °C above the central core. Cardiac output, hemodynamics and pulmonary function parameters were evaluated. RESULTS:During the cooling phase, cardiac output, heart rhythm and blood pressure decreased continuously. Pulmonary artery pressure tended to increase at 32 °C compared to the initial value (20.2 ± 1.7 mmHg vs. 29.1 ± 5.6 mmHg, p = 0.09). During rewarming, arterial blood pressure was higher in the NF than in the LF group at 20° and 25 °C (p = 0.003 and 0.05, respectively). After rewarming to 35 °C, cardiac output was 3.9 ± 0.5 L/min in the NF group vs. 2.7 ± 0.5 L/min in LF group (p = 0.06). At the end of rewarming under ECLS cardiac output was inversely proportional to the ECLS flow rate. Moreover, the ECLS flow rate did not significantly change pulmonary vascular resistance. DISCUSSION:Using a newly developed experimental model of DHCA treated by ECLS, we assessed the cardiac and pulmonary pathophysiological response during the cooling phase and the ECLS rewarming phase. Despite lower metabolic need during hypothermia, a low ECLS blood flow rate during rewarming did not improved cardiopulmonary injuries after rewarming. CONCLUSION:A low ECLS flow rate during the rewarming phase did not attenuate pulmonary lesions, increased blood lactate level and tended to decrease cardiac output after rewarming. A normal ECLS flow rate did not increase pulmonary vascular resistance compared to a low flow rate. This experimental model on pigs contributes a number of pathophysiological findings relevant to the rewarming strategy for patients who have undergone accidental DHCA.
journal_name
Scand J Trauma Resusc Emerg Medauthors
Debaty G,Maignan M,Perrin B,Brouta A,Guergour D,Trocme C,Bach V,Tanguy S,Briot Rdoi
10.1186/s13049-016-0283-7subject
Has Abstractpub_date
2016-07-08 00:00:00pages
91issn
1757-7241pii
10.1186/s13049-016-0283-7journal_volume
24pub_type
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journal_title:Scandinavian journal of trauma, resuscitation and emergency medicine
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journal_title:Scandinavian journal of trauma, resuscitation and emergency medicine
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journal_title:Scandinavian journal of trauma, resuscitation and emergency medicine
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journal_title:Scandinavian journal of trauma, resuscitation and emergency medicine
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journal_title:Scandinavian journal of trauma, resuscitation and emergency medicine
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journal_title:Scandinavian journal of trauma, resuscitation and emergency medicine
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journal_title:Scandinavian journal of trauma, resuscitation and emergency medicine
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journal_title:Scandinavian journal of trauma, resuscitation and emergency medicine
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journal_title:Scandinavian journal of trauma, resuscitation and emergency medicine
pub_type: 杂志文章,多中心研究
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journal_title:Scandinavian journal of trauma, resuscitation and emergency medicine
pub_type: 杂志文章
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