Acta anaesthesiologica Scandinavica
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Acta Anaesthesiol Scand · Jun 1997
The combination of external high-frequency oscillation and pressure support ventilation in acute respiratory failure.
Effective gas exchange can be maintained in animals by using external high-frequency oscillation (EHFO). The present study evaluates the effect of relatively long-term duration EHFO combined with pressure support ventilation (PSV) in patients with acute respiratory failure. ⋯ As a method of ventilation for patients with acute respiratory failure, EHFO combined with PSV may have potential advantages over conventional mechanical ventilation when drainage of secretions if facilitated. Beneficial effects of EHFO may appear after several hours.
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Acta Anaesthesiol Scand · Jun 1997
Beneficial effects of the prone position on the incidence of barotrauma in oleic acid-induced lung injury under continuous positive pressure ventilation.
Factors that contribute to ventilator-induced barotrauma are not well defined. This study investigates the effects of posture on ventilator-induced barotrauma, as well as arterial oxygenation. ⋯ It was concluded that in lung injury dogs, the prone position has beneficial effects on the incidence of ventilator-induced barotrauma and arterial oxygenation when compared with the lateral position. Ventilator-induced barotrauma may occur at lower airway pressure.
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Acta Anaesthesiol Scand · May 1997
Case ReportsA survey of the ASA physical status classification: significant variation in allocation among Finnish anaesthesiologists.
The American Society of Anesthesiologists' (ASA) Classification of Physical Health is a widely used grading system for preoperative health of the surgical patient. In previous studies conducted in North America and Great Britain, considerable variation in the ASA classification allocation has been reported. We hypothesised that in smaller and culturally more homogeneous countries there might be less variation in the ASA classification. ⋯ In a small and culturally homogeneous country, like Finland, there exists similar wide variation in the ASA classification as has been previously reported from larger and culturally more heterogeneous countries. The significant variation should always be considered when using this classification in clinical or scientific work.
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Acta Anaesthesiol Scand · May 1997
Randomized Controlled Trial Clinical TrialIntrathecal morphine for post-sternotomy pain in patients with myasthenia gravis: effects on respiratory function.
Thymectomy can induce a remission or at least an improvement in myasthenia gravis (MG) patients. After sternotomy MG patients with compromised muscle strength need an excellent postoperative pain relief. This study was designed to evaluate the efficacy of intrathecal morphine (ITM) on ventilatory function among MG patients undergoing trans-sternal thymectomy, when intravenous morphine served as control. ⋯ Intrathecal morphine provided effective postoperative analgesia and significantly improved ventilatory function when compared with intravenous morphine.
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Acta Anaesthesiol Scand · May 1997
Clinical Trial Controlled Clinical TrialIntravenous phentolamine test--an aid in the evaluation of patients with persistent pain after low-back surgery?
Persistent pain following surgery in the treatment of chronic low-back pain patients is still relatively frequent. Most of these patients with persistent pain have clinical signs of neuropathic pain. The neuropathic pain might be sympathetically maintained pain (SMP) or sympathetically independent pain (SIP). Systemic administration of phentolamine, a competitive alpha-adrenergic antagonist, has been used as a diagnostic tool to identify patients with SMP. ⋯ SMP is either an uncommon cause of persistent pain in this type of failed back surgery patients or the phentolamine test, as we performed it, was unable to identify SMP.