Cardiovascular surgery (London, England)
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Comparative Study Clinical Trial Controlled Clinical Trial
The effects of methylprednisolone on complement, immunoglobulins and pulmonary neutrophil sequestration during cardiopulmonary bypass.
In this study, the authors administered high dose (30 mg/kg body weight i.v.) methylprednisolone before cardiopulmonary bypass to observe the effects on complement, immunoglobulins and pulmonary neutrophil sequestration. Fifty patients undergoing valve replacements were included in this study. Patients were divided into two groups: group I (20 patients) served as control and did not receive methylprednisolone, group II (30 patients) received methylprednisolone. ⋯ All immunoglobulin (IgG, IgM, IgA) levels were decreased in both groups, but the decrease in IgG was statistically significant after skin closure in group I compared with group II (P < 0.05). Pulmonary neutrophil sequestration was higher in the control group compared with the methyl-prednisolone group (P < 0.05). In conclusion, methylprednisolone administration before cardiopulmonary bypass may prevent the harmful effects of complement activation, immunoglobulin denaturation and neutrophil sequestration in the pulmonary capillary system.
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It is believed that moderate hypothermia (25-32 degrees C) during cardiopulmonary bypass provides cerebral protection by reducing the cerebral metabolic rate (CMRO2). Nevertheless episodes of ischaemia do occur and thus it has been suggested that cerebral oxygenation should be monitored by jugular venous oximetry. However, this technique is cumbersome and invasive. ⋯ In contrast, near infrared spectroscopy demonstrated increased oxygen extraction (HbO2 - 11.5 +/- 1 microM, HHb + 3.2 +/- 0.3 microM) and a fall in the cerebral concentration of oxidized cytochrome oxidase ( - 1.7 +/- 0.3 microM) indicating ischaemia. These results suggest that cerebral ischaemia occurs during hypothermic cardiopulmonary bypass with a spurious rise in jugular venous oxygen saturation, which represents arterio-venous shunting. Thus if hypothermia does facilitate cerebral protection it does not appear to be a direct result of a reduction in CMRO2 and oxygen requirement.
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Case Reports
Preoperative extracorporeal membrane oxygenation in newborns with total anomalous pulmonary venous connection.
This report describes three neonates who were supported with extracorporeal membrane oxygenation before surgical correction of total anomalous pulmonary venous connection. Extracorporeal membrane oxygenation was initially used to treat preoperative end-organ failure and suspected persistent pulmonary hypertension. ⋯ Two of these patients required extracorporeal membrane oxygenation after surgery; one died from bleeding while the other was weaned from extracorporeal membrane oxygenation on day 8 and discharged from the hospital. These results show that veno-arterial extracorporeal membrane oxygenation represents a life-saving perioperative means for supporting moribund neonates with total anomalous pulmonary venous connection and is effective in improving preoperative patient's condition.