• Mark J Heulitt, Tracy L Thurman, Shirley J Holt, Chan He Jo, and Pippa Simpson.
• From the Section of Pediatric Critical Care Medicine (MJH, TLT, SJH), College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR; and Section of Biostatistics (CHJ, PS), Department of Pediatrics, University of Arkansas for Medical Sciences College of Medicine, Little Rock, AR.
• Pediatr Crit Care Me. 2008 Oct 3.

Ahead of Print article withdrawn by publisher: ObjectivePrevious studies have shown significant difference between ventilator-measured tidal volume and actual-delivered tidal volume. However, these studies utilized external methods for measurement of compression volume. Our objective was to determine whether tidal volume could be accurately measured at the expiratory valve of a conventional ventilator using internal computer software to compensate for circuit compliance, with a dual control mode of ventilation. DESIGN:: Clinical study during an 8-month period. SETTING:: Pediatric intensive care unit. PATIENTS:: All patients admitted to the pediatric intensive care unit during the enrollment period who were mechanically ventilated using the Servo i (Maquet, Bridgewater, NJ) were eligible for this study. INTERVENTIONS:: Patients were ventilated utilizing a dual control mode of ventilatory support and either an infant or adult circuit (with and without circuit compensation). MEASUREMENTS AND MAIN ResultsTidal volume measured at the endotracheal tube using a pneumotachometer was compared with ventilator-displayed tidal volume. Sixty-eight patients were studied between September 2004 and April 2005. Age range 2 days-18 yrs (median: 23 months), weight range 2.3-103 kg (median: 14.5 kg), with 41 (60%) male. We found ventilator-displayed tidal volume, without circuit compensation, generally overestimates true-delivered tidal volume, and with circuit compensation, generally underestimates true-delivered tidal volume. However, agreement between tidal volume measured at the patient's airway and that measured with and without compensation for circuit compliance was good. The error in both cases, without and with circuit compensation is relatively greater in infants and small children. ConclusionThere is an underestimation of delivered tidal volume when compensating for circuit volume loss measured at the ventilator. There is no improvement in measured tidal volume utilizing circuit compensation in small infants and children.

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