Abstract

Pressure controlled ventilation (PCV) is an alternate mode of ventilation which utilizes a decelerating flow and constant pressure. Ventilator parameters are automatically changed with each patient breath, to offer the target tidal volume without increasing airway pressures. All the patients were examined during the pre-operative visit, a day before surgery. Routine blood investigations including complete haemogram, renal function test, blood sugar, chest X-ray and electrocardiogram (ECG) was carried out and recorded. They were kept nil orally 8 hours before surgery and were pre-medicated with alprazolam 0.5 mg per oral (PO), the night before surgery and ranitidine 150 mg and ondansetron 2 mg PO on the morning of surgery. The mean (SD) of heart rate in the VCV group are 71.3 (5.1), 72.1 (4.6) and 73.4 (4.5) at T1, T2 and T3 respectively. In the PCV group are 68.8 (3.0), 71.7 (3.1) and 71.5 (3.4) at T1, T2 and T3 respectively. Statistically there is a significant difference between group VCV and PCV at T1 (p=0.013). There is no significant statistical difference between VCV and PCV groups at T2 (p=0.674) and T3 (p=0.053).

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