Implications: The initial arterial concentrations of propofol after IV administration were shown to be inversely related to cardiac output. This implies that cardiac output may be a determinant of the induction of anesthesia with propofol.
Implications: Hospital records showed patients with prior percutaneous transluminal coronary angioplasty were twice as likely as healthy patients to have an adverse cardiac outcome after noncardiac surgery, although their risk was reduced by half compared with patients with untreated coronary artery disease. Further study of the role of percutaneous transluminal coronary angioplasty in modulating noncardiac surgery risk is needed.
Implications: Our results suggest that the administration of isoflurane before ischemia and during reperfusion protects against ischemia-reperfusion-induced injury in isolated rabbit lungs.
Implications: We studied ascending aortic and radial pulse contours in patients scheduled for coronary artery surgery. The radial pulse wave can be used for interpretation of central hemodynamic changes during nitroglycerin-, but not prostacyclin-, induced hypotension.
Implications: Heparin coating can reduce platelet adhesion and activation in the presence of small-dose heparinization, potentially reducing the inflammatory response and activation of thrombosis and fibrinolysis.
Implications: We examined the use of abciximab-modified thrombelastography in patients undergoing cardiac surgery. Modification of thrombelastography with abciximab-fab allows prediction of fibrinogen levels, despite coagulation altered by cardiac surgery. The difference of standard maximum amplitude and abciximab-modified maximum amplitude correlates with platelet function when expressed in dynes per square centimeter.
Implications: In previous retrospective studies and case reports, investigators have identified a possible risk of hemodynamic compromise when patients receiving chronic amiodarone therapy are given anesthesia regimens containing fentanyl. We performed a prospective, randomized, double-blinded study to evaluate the hemodynamic effects of short-term amiodarone therapy during fentanyl-isoflurane anesthesia for open heart surgery. No adverse hemodynamic effects of amiodarone were identified.
Implications: In our study, aprotinin therapy significantly decreased autologous, but not homologous, transfusion requirements in posterior lumbar spine fusion.
Implications: Fast-track cardiac anesthesia can be used safely in patients with sickle cell trait undergoing first-time coronary artery bypass graft surgery. Extubation time and intensive care unit and hospital length of stay are comparable to those of matched controls, and blood loss and transfusion requirements are not increased. A hematocrit of 20% seems to be a safe transfusion trigger during cardiopulmonary bypass in these patients.
Implications: Experiments in membranes and cardiac preparations isolated from rat heart demonstrate that relatively high concentrations of propofol (25200 µM) are required to antagonize ß-adrenoceptor binding and tissue responsiveness.
Implications: A vital capacity induction with sevoflurane produced a faster loss of consciousness and had side effects, recovery times, and patient satisfaction similar to that of a propofol induction in adults undergoing ambulatory surgery.
Implications: In this study, we showed that the incidence of postoperative nausea and vomiting and the need for antiemetics do not increase with the use of neostigmine and glycopyrrolate for reversal of residual muscle paralysis.
Implications: To determine whether an epidurally administered local anesthetic has been unintentionally injected into a blood vessel, a small dose of epinephrine is often added to a local anesthetic. We found that an increase in T-wave amplitude 25% in lead II and a heart rate increase 10 bpm are useful indicators for detecting the accidental intravascular injection of a small dose of epinephrine in sevoflurane-anesthetized children.
Implications: Our laboratory investigation suggests that pressure-limited ventilation delivered by a standard adult circle system compares favorably with that of freestanding infant ventilators used in pressure-limited mode. Changing from an adult circle system to a free-standing pressure-limited ventilator may not substantially improve ventilation of a low-compliance infant lung; the efficacy of such a practice should be investigated.
Implications: Although there is variability in how patients rated postoperative outcomes, avoiding nausea/vomiting, incisional pain, and gagging on the endotracheal tube was a high priority for most patients. Whether clinicians can improve the quality of anesthesia by designing anesthesia regimens that most closely meet each individual patient's preferences for clinical outcomes deserves further study.
Implications: The results of two representative surveys conducted over a 6-yr interval show significant improvements of knowledge and attitudes regarding pain and its management in the French general population. However, these results point to the need for additional specific information that should be provided through patient-physician interactions.
Implications: We found that ketamine suppressed lipopolysaccharide-induced tumor necrosis factor , interleukin (IL)-6, and IL-8 production and recombinant human tumor necrosis factor-induced IL-6 and IL-8 production in human whole blood. Ketamine directly suppresses proinflammatory cytokine production.
Implications: In this study, we tested the hypothesis that delayed recovery after neurosurgery would attenuate the consequences of recovery from general anesthesia. As markers of stress, oxygen consumption and noradrenaline blood levels were higher after delayed versus early recovery. Thus, delayed recovery cannot be recommended as a mechanism of limiting the metabolic and hemodynamic consequences from emergence after neurosurgery.
Implications: We found, in dogs, that the gradient between brain venous and tissue PO2 and PCO2 is increased with increased arterial PCO2. The divergence between tissue and venous gases can be described by arterial to venous shunting.
Implications: This study suggests that nitrous oxide does not affect the dynamic cerebrovascular reactivity to acute arterial carbon dioxide (CO2) changes, i.e., exponential changes in cerebral blood flow in response to step changes in alveolar CO2 tension, although it does produce a mild increase in normocapnic cerebral blood flow velocity.
Implications: Our data suggest that the linkage of O2 supply and consumption is not tightly coupled under isoflurane anesthesia. ß-Adrenergic blockers may tighten this linkage and reduce the number of low O2-saturated microregions.
Implications: Nonselective inhibition of nitric oxide synthase activity has aggravating effects on the neurologic and histopathologic outcome after transient spinal cord ischemia.
Implications: The placental transfer of ropivacaine was shown to be similar to that of bupivacaine, and is thus highly influenced by the degree of maternal and fetal protein binding and fetal pH.
Implications: Epidural preemptive analgesia was reliably effective in limb and breast surgeries but ineffective in abdominal surgery, suggesting involvement of the brainstem and cervical spinal cord via the vagus and phlenic nerves.
Implications: Spinally administered midazolam, even in large doses, does not cause acute neurotoxicity or inflammation of the spinal cord.
Implications: Neurons in the brainstem, isolated electrophysiologically, were used as whole body monitors of pain-related activity in the rat. As a neurophysiologic model of nociception, this preparation may prove useful for the study of regionally administered analgesics and local anesthetics.
Implications: In this study, volunteers received lidocaine 0.5% or ropivacaine 0.2% for IV regional anesthesia on two study days. Ropivacaine and lidocaine provided similar surgical conditions. However, after release of the distal tourniquet, prolonged sensory blockade and fewer central nervous system side effects were observed with ropivacaine.
Implications: The relative potency of oral transmucosal fentanyl citrate (OTFC) to IV morphine was 814:1. In this postoperative setting, OTFC produced rapid pain relief similar to that produced by IV morphine. The larger doses of OTFC (800 µg) and morphine (10 mg) produced better and more sustained analgesia than 200 µg of OTFC or 2 mg of morphine.
Implications: Quick onset of block with prolonged postoperative analgesia is an important goal in regional anesthesia for ophthalmic surgery. Evaluating clinical properties of 0.75% ropivacaine and a 1:1 mixture of 2% lidocaine and 0.5% bupivacaine for peribulbar anesthesia, we demonstrated that ropivacaine has an onset similar to that of the lidocaine-bupivacaine mixture and provides a better quality of postoperative analgesia.
Implications: To determine whether an epidural catheter is in a blood vessel, an epidural test dose containing 15 µg of epinephrine is used. We found that, during propofol anesthesia with or without fentanyl, a heart rate increase 10 bpm and a systolic blood pressure increase 15 mm Hg are reliable indicators for detecting accidental intravascular injection.
Implications: In this double-blinded study, we found that the preoperative administration of IV dextromethorphan 5 mg/kg, compared with postoperative administration, reduces postoperative morphine consumption, which may provide clinical evidence of preemptive or preventive analgesic effects of dextromethorphan.
Implications: The development of acute tolerance to opioid analgesics has been suggested based on experimental studies in animals and volunteers. Our report from patients who self-controlled their analgesic requirements by using target-controlled infusions of alfentanil and remifentanil for postoperative analgesia provides no evidence of tolerance to opioids.
Implications: Upper airway obstruction during recovery from general anesthesia induced by IV midazolam is associated with low tonic pharyngeal muscular support, which modulates upper airway patency in the postoperative period.
Implications: The soda lime bases used to absorb carbon dioxide from anesthetic circuits can degrade inhaled anesthetics to compounds such as carbon monoxide and the nephrotoxin, Compound A. Elimination of the bases sodium hydroxide and potassium hydroxide decreases production of these noxious compounds without materially decreasing the capacity of the remaining base, Ca(OH)2, to absorb carbon dioxide.
Implications: As predicted by the concentration and second gas effects, increasing the inspired concentration of nitrous oxide accelerated its rate of rise and the rate of rise of concurrently administered desflurane in humans.
Implications: Diaphragmatic fatigue may contribute to the development of respiratory failure. Compared with milrinone, olprinone improves the contractility in fatigued diaphragm in dogs.
Implications: We examined the factors influencing doxacurium's pharmacokinetic and pharmacodynamic characteristics. Both creatinine clearance and obesity significantly influence its time course. The effect of obesity is minimized if patients are dosed based on ideal body weight.
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