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BMC Anesthesiology
Published in: BMC Anesthesiology 1/2014

Open Access 01-12-2014 | Research article

Cardiac condition during cooling and rewarming periods of therapeutic hypothermia after cardiopulmonary resuscitation

Authors: Serdar Demirgan, Kerem Erkalp, M Salih Sevdi, Meltem Turkay Aydogmus, Numan Kutbay, Aydin Firincioglu, Ali Ozalp, Aysin Alagol

Published in: BMC Anesthesiology | Issue 1/2014

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Abstract

Background

Hypothermia has been used in cardiac surgery for many years for neuroprotection. Mild hypothermia (MH) [body temperature (BT) kept at 32–35°C] has been shown to reduce both mortality and poor neurological outcome in patients after cardiopulmonary resuscitation (CPR). This study investigated whether patients who were expected to benefit neurologically from therapeutic hypothermia (TH) also had improved cardiac function.

Methods

The study included 30 patients who developed in-hospital cardiac arrest between September 17, 2012, and September 20, 2013, and had return of spontaneous circulation (ROSC) following successful CPR. Patient BTs were cooled to 33°C using intravascular heat change. Basal BT, systolic artery pressure (SAP), diastolic artery pressure (DAP), mean arterial pressure (MAP), heart rate, central venous pressure, cardiac output (CO), cardiac index (CI), global end-diastolic volume index (GEDI), extravascular lung water index (ELWI), and systemic vascular resistance index (SVRI) were measured at 36°C, 35°C, 34°C and 33°C during cooling. BT was held at 33°C for 24 hours prior to rewarming. Rewarming was conducted 0.25°C/h. During rewarming, measurements were repeated at 33°C, 34°C, 35°C and 36°C. A final measurement was performed once patients spontaneously returned to basal BT. We compared cooling and rewarming cardiac measurements at the same BTs.

Results

SAP values during rewarming (34°C, 35°C and 36°C) were lower than during cooling (P < 0.05). DAP values during rewarming (basal temperature, 34°C, 35°C and 36°C) were lower than during cooling. MAP values during rewarming (34°C, 35°C and 36°C) were lower than during cooling (P < 0.05). CO and CI values were higher during rewarming than during cooling. GEDI and ELWI did not differ during cooling and rewarming. SVRI values during rewarming (34°C, 35°C, 36°C and basal temperature) were lower than during cooling (P < 0.05).

Conclusions

To our knowledge, this is the first study comparing cardiac function at the same BTs during cooling and rewarming. In patients experiencing ROSC following CPR, TH may improve cardiac function and promote favorable neurological outcomes.
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Metadata
Title
Cardiac condition during cooling and rewarming periods of therapeutic hypothermia after cardiopulmonary resuscitation
Authors
Serdar Demirgan
Kerem Erkalp
M Salih Sevdi
Meltem Turkay Aydogmus
Numan Kutbay
Aydin Firincioglu
Ali Ozalp
Aysin Alagol
Publication date
01-12-2014
Publisher
BioMed Central
Published in
BMC Anesthesiology / Issue 1/2014
Electronic ISSN: 1471-2253
DOI
https://doi.org/10.1186/1471-2253-14-78

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