title: Small volume resuscitation with tempol is detrimental during uncontrolled hemorrhagic shock in rats.
abstract: BACKGROUND
  In a previous study, titration of a hypertonic saline (HTS) solution during severe uncontrolled hemorrhagic shock (UHS) failed to reduce mortality. In a separate study, a novel antioxidant, polynitroxylated albumin (PNA) plus tempol (4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl), infused during shock increased long-term survival. We hypothesized that combining potent antioxidants with a hypertonic solution during UHS would preserve the logistical advantage of small volume resuscitation and improve survival.
  
  
  METHODS
  An UHS outcome model in rats was used. UHS phase I (90 min) included blood withdrawal of 30 ml/kg over 15 min, followed by tail amputation for uncontrolled bleeding. At 20 min, rats were randomized to four groups (n=10 each) for hypotensive resuscitation from 20 to 90 min (mean arterial pressure [MAP] > or = 40 mmHg): HTS/starch group received 7.2% NaCl/10% hydroxyethyl starch; HTS/albumin group received 7.5% NaCl/20% albumin; HTS/PNA group received 7.5% NaCl/20% PNA; HTS/albumin+tempol group received 7.5% NaCl/20% albumin plus tempol. Resuscitation phase II (180 min) included hemostasis, return of shed blood and administration of fluids to restore MAP > or = 80 mmHg. Observation phase III was to 72 h.
  
  
  RESULTS
  The total amount of fluid required to maintain hypotensive MAP during HS was low and did not differ between groups (range: 3.4+/-1.9 to 5.3+/-2.5 ml/kg). The rate of fluid administration required was higher in the HTS/albumin+tempol group compared to all other groups (p=0.006). Additional uncontrolled blood loss was highest in the HTS/PNA group (16.2+/-5.7 ml/kg [p=0.01] versus 10.4+/-7.9 ml/kg in the HTS/starch group, 7.7+/-5.2 ml/kg in the HTS/albumin group and 8.2+/-7.1 ml/kg in the HTS/albumin+tempol group). MAP after start of resuscitation in phase I was lower in the HTS/albumin+tempol group than the HTS/albumin or HTS/PNA groups (p<0.01). This group was also less tachycardic. Long-term survival was low in all groups (2 of 10 after HTS/starch and 1 of 10 after HTS/albumin, 3 of 10 after HTS/PNA, 1 of 10 after HTS/albumin+tempol). Median survival time was shortest in the HTS/albumin+tempol group (72 min [CI 34-190]) compared to all other groups (p=0.01).
  
  
  CONCLUSIONS
  Despite its benefits in other model systems, free tempol is potentially hazardous when combined with hypertonic fluids. PNA abrogates these deleterious effects on acute mortality but may lead to increased blood loss in the setting of UHS.
authors.affiliation: Safar Center for Resuscitation Research, University of Pittsburgh, 3434 Fifth Avenue, Pittsburgh, PA 15260, USA.
authors.forename: Rainer
authors.initials: R
authors.lastname: Kentner
authors.forename: Peter
authors.initials: P
authors.lastname: Safar
authors.forename: Wilhelm
authors.initials: W
authors.lastname: Behringer
authors.forename: Xianren
authors.initials: X
authors.lastname: Wu
authors.forename: Jeremy
authors.initials: J
authors.lastname: Henchir
authors.forename: Li
authors.initials: L
authors.lastname: Ma
authors.forename: Carleton J C
authors.initials: CJ
authors.lastname: Hsia
authors.forename: Samuel A
authors.initials: SA
authors.lastname: Tisherman
mesh_terms: D000418:Albumins / Q000494:pharmacology*; D000818:Animals; D000975:Antioxidants / Q000009:adverse effects* / Q000494:pharmacology; D003497:Cyclic N-Oxides / Q000009:adverse effects* / Q000494:pharmacology; D004195:Disease Models, Animal; D004357:Drug Synergism; D005440:Fluid Therapy / Q000379:methods; D006400:Hematocrit; D008297:Male; D051381:Rats; D017207:Rats, Sprague-Dawley; D012151:Resuscitation / Q000379:methods; D012462:Saline Solution, Hypertonic / Q000008:administration & dosage*; D012771:Shock, Hemorrhagic / Q000401:mortality / Q000503:physiopathology / Q000628:therapy*; D013113:Spin Labels; D015996:Survival Rate
chemical_list: D000418:Albumins; D000975:Antioxidants; D003497:Cyclic N-Oxides; D012462:Saline Solution, Hypertonic; D013113:Spin Labels; C117059:polynitroxyl-albumin; C001803:tempol