Articles: general-anesthesia.
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This review describes the distribution of ventilation and blood flow in the anaesthetized subject, during spontaneous breathing and after muscle paralysis. Within minutes after induction of anaesthesia, the diaphragm is shifted cranially (supine position), functional residual capacity is reduced and collapse of dependent lung regions can be seen by means of computed tomography. These changes occur whether anaesthesia is intravenous (barbiturate) or inhalational (halothane) and whether ventilation is spontaneous or mechanical. ⋯ This causes a ventilation/perfusion mismatch, the hall-mark of which is shunt. Additional factors such as airway closure and release of hypoxic pulmonary vasoconstriction may contribute to the gas exchange disturbance. The major features of the lung function impairment are already present during spontaneous breathing in the anaesthetized subject, and muscle paralysis adds only little to the disturbance.
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Acta Anaesthesiol Belg · Jan 1988
ReviewNo decisive break-through yet for general anesthesia combined with locoregional anesthesia!
Although on theoretical grounds locoregional anesthesia, because of the claimed suppression of stress response and the ease with which prolonged analgesia can be achieved, seems preferable to general anesthesia, the shortcomings and drawbacks are such that its use is restricted to well chosen indications. The hope that combination anesthesia can overcome the limitations of both techniques remain to be proven whereas the problems that can arise during the combined technique could pose a major threat to the patient.
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General anaesthesia in pregnancy is still responsible for a significant morbidity and mortality. The most common and most serious complications are respiratory secondary to changes induced by pregnancy. These are dominated by hypoxia during difficult intubation and inhalation of gastric contents. Their incidence could be largely reduced by the extensive use of regional local anaesthesia.