Sodium pump reduction correlates with aortic clamp time in pediatric heart surgery.
Myocardial depression after cardiac surgery is modulated by cardiopulmonary bypass (CPB) and the underlying heart disease. The sodium pump is a key component for myocardial function. We hypothesized that the change in sodium pump expression during CPB correlates with intraoperative and postoperative laboratory and clinical parameters in neonates and children with various congenital heart defects. Sodium pump isoforms alpha1 (ATP1A1) and alpha3 (ATP1A3) mRNA expression in right atrial myocardium, excised before and after CPB, was quantified. Groups were assigned according to presence (VO group, n = 8) or absence (NO group, n = 8) of right atrial volume overload. CPB and aortic clamp time correlated with postoperative troponin-I values and ICU stay. ATP1A1 (P = 0.008) and ATP1A3 (P = 0.038) mRNA expression were significantly reduced during CPB. Longer aortic clamp times were associated with lower postoperative ATP1A1 (P = 0.045) and ATP1A3 (P = 0.002) mRNA expression. Low postoperative ATP1A1 (P = 0.043) and ATP1A3 (P = 0.002) expressions were associated with high troponin-I values. These results were restricted to the VO group. No correlation of sodium pump mRNA expression was found with the duration of ICU stay or ventilation. The postoperative troponin-I and clinical parameters correlated with the length of CPB, regardless of volume overload. In contrast, only dilated right atrium seemed to be susceptible to CPB in terms of sodium pump expression, showing a reduction during the operation and a correlation of sodium pump with postoperative troponin-I values.
Pavlovic
Mladen
M
Division of Pediatric Cardiology, University Children's Hospital, Freiburgstrasse 23, 3010 Berne, Switzerland. mladen.pavlovic@insel.ch
Schaller
André
A
Ammann
Roland A
RA
Pfammatter
Jean-Pierre
JP
Berdat
Pascal
P
Carrel
Thierry
T
Gallati
Sabina
S
D001011:Aorta / Q000601:surgery*; D002315:Cardiopulmonary Bypass; D002648:Child; D002675:Child, Preschool; D006325:Heart Atria / Q000378:metabolism / Q000473:pathology; D006330:Heart Defects, Congenital / Q000601:surgery*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007362:Intensive Care Units; D007432:Intraoperative Period; D011184:Postoperative Period; D020033:Protein Isoforms / Q000096:biosynthesis; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D000254:Sodium-Potassium-Exchanging ATPase / Q000096:biosynthesis*; D013997:Time Factors; D019210:Troponin I / Q000096:biosynthesis
C488756:ATP1A3 protein, human; D020033:Protein Isoforms; D012333:RNA, Messenger; D019210:Troponin I; C499076:ATP1A1 protein, human; D000254:Sodium-Potassium-Exchanging ATPase