Resuscitation
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The purpose of this study was to examine whether tracheal insufflation of oxygen (TRIO) could be used as a substitute for intermittent positive pressure ventilation (IPPV) during cardiopulmonary resuscitation (CPR) in dogs with orotracheal intubation. Twenty-seven anesthetized, paralyzed and intubated dogs were used. The tip of the insufflation catheter was placed 1 cm distal to the top of the endotracheal tube. ⋯ No significant differences were observed in arterial, pulmonary artery and diastolic right atrial pressures during CPR among the three groups. However, the coronary perfusion pressures in the TRIO group with CPAP always tended to be low during CPR. The present study suggests that TRIO without CPAP should be a promising substitute for IPPV during CPR when IPPV is not feasible.
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Comparative Study
Pentoxifylline alone versus pentoxifylline combined with superoxide dismutase prolongs survival in a rat hemorrhagic shock model.
Pentoxifylline (PTX) and superoxide dismutase (SOD) have each proven effective in improving survival when administered during resuscitation in animal models of hemorrhagic shock. This study was conducted to determine if PTX and SOD combined would have synergistic effectiveness in the treatment of hemorrhagic shock. Sprague-Dawley rats (n = 40) were phlebotomized at 25 ml/kg for 2 min, then subjected to a 45-min ischemic period, and resuscitated with lactated Ringer's solution (LR) (50 ml/kg) over 1 h. ⋯ Animals were randomized into groups to receive one of the following agents during resuscitation: PTX in LR, SOD in LR, a combination of PTX and SOD in LR, or LR alone. PTX or SOD alone were effective in prolonging survival. However, the combination of PTX and SOD did not prolong survival above LR control.
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Comparative Study
Early volume expansion during cardiopulmonary resuscitation.
To determine if hemodynamic parameters, return of spontaneous circulation (ROSC), and short term survival are improved by volume expansion during resuscitation from ventricular fibrillation cardiac arrest. ⋯ Early volume expansion with epinephrine during HICPR does not improve CPP, rate of ROSC, or rate of short term survival from VF arrest in this porcine model. HSD volume expansion does improve systemic hemodynamics after ROSC with increased CPP, AoSBP, and AoDBP. Improved tissue perfusion in Group B animals after ROSC is suggested by a decreased pH and increased PCO2 presumably secondary to enhanced mobilization of lactate and PCO2 from tissues.
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Return of spontaneous circulation with CPR is a function of coronary perfusion pressure, which is determined by vasomotor tone and the force of compression. Vasomotor tone is affected by the relative stimulation of arterial vasoconstricting and vasorelaxing receptors by vasoactive substances. We measured the plasma levels of the endogenous vasoactive peptides arginine vasopressin (AVP) angiotensin II (ANG-II) and atrial natriuretic peptide (ANP) during cardiac arrest and resuscitation. ⋯ There were significant increases in the levels of these endogenous vasoactive peptides. This reflects the neuroendocrine response to global ischemia and CPR reperfusion. Plasma levels of these peptides may effect the vital organ perfusion pressures, response to exogenous vasopressors, and outcome of resuscitative efforts. Future therapies may be directed at enhancing or blocking the effect of these peptides so as to optimize perfusion pressure which is one of the principle determinants of outcome during CPR.