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Neurosurgical patients are operated in supine, prone, lateral and sitting positions, which cause physiological changes in cardiorespiratory parameters. Various monitors, both non invasive and invasive are used to monitor these changes. NICO monitor developed by Novametrix Medical Sy and displays various other parameters like stroke volume, cardiac index, pulmonary capillary blood flow, alveolar and dead space ventilation, peak flow rates, airway pressures and respi monitor in anaesthetised patients being operated in different positions would provide a complete characterization of cardiopulmonary function, help in defining risk factors and improve intraoperative mana consecutive patients undergoing neurosurgical procedures were studied. The haemodynamic and cardiorespiratory parameters were noted in supine position about 15 minutes a induction of general anaesthesia using standard protocol and 15 minutes after giving surgical position using NICO monitor. We concluded that under anaesthesia, while the respiratory parameters are not significantly affected, the prone and sitting posi tion negatively affect derived cardiac parameters like cardiac output, cardiac index and stroke volume and lateral position tends to improve these parameters. operated in supine, prone, lateral and sitting positions, which cause physiological changes in cardiorespiratory parameters. Various monitors, both non invasive and invasive are used to monitor these changes. NICO monitor developed by Novametrix Medical Sy stem Inc is a non9invasive cardiac output monitor, which also measures and displays various other parameters like stroke volume, cardiac index, pulmonary capillary blood flow, alveolar and dead space ventilation, peak flow rates, airway pressures and respi ratory volumes. We felt that a study using the NICO monitor in anaesthetised patients being operated in different positions would provide a complete characterization of cardiopulmonary function, help in defining risk factors and improve intraoperative mana consecutive patients undergoing neurosurgical procedures 9 twenty in prone, sixteen in lateral and four in sitting position were studied. The haemodynamic and cardiorespiratory parameters were noted in supine position about 15 minutes a induction of general anaesthesia using standard protocol and 15 minutes after giving surgical position using NICO monitor. We concluded that under anaesthesia, while the respiratory parameters are not significantly affected, the prone tion negatively affect derived cardiac parameters like cardiac output, cardiac index and stroke volume and lateral position tends to improve these parameters. Non invasive cardiac output, NICO monitor, Neurosurgery, Positioning under Anaesthesia, Lateral position, Sitting position.

A Study of Noninvasive Cardiac Output and Other Cardiorespiratory Parameters in Various Neurosurgical Positions