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Wierda JM. Schuringa M. van den Broek L., Cardiovascular effects of an intubating dose of rocuronium 0.6 mg kg-1 in anaesthetized patients, paralysed with vecuronium. British Journal of Anaesthesia. 78(5):586-7, 1997.
The authors studied, in adult patients, ASA I-II, the cardiovascular effects of an intubating dose of rocuronium 0.6 mg kg-1. After induction, patients were paralyzed with vecuronium and the trachea intubated. Heart rate (HR) and non-invasive mean arterial pressure (MAP) were measured every 1 min. After stabilization of HR and MAP, defined as < 3% change over three measurements, rocuronium (n = 20) or saline (n = 10) was injected at random. Mean HR increased initially from 66.6 to 72.1 beat min-1, 4 min after rocuronium, and then decreased gradually to 69.6 beat min-1, that is a net increase of 3.3 beat min-1 over 10 min (P < 0.001), whereas after saline there was a gradual decrease from 65.8 to 60.9 beat min-1 (P < 0.001) over 10 min. From the third minute, HR was significantly higher in the rocuronium group. Mean MAP decreased in both groups within 10 min to a similar extent after rocuronium and saline, that is from 74.9 to 72.1 mm Hg and from 74.7 to 72.2 mm Hg, respectively (both P < 0.001). There were no differences in MAP at any time between the rocuronium and saline groups. The authors conclude that an intubating dose of rocuronium, in the absence of hemodynamic effects related to paralysis itself, resulted in a limited increase in HR without change in MAP, probably because of its weak vagolytic activity.
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