High Tidal Volume Induces Inflammation In Normal Lungs

Federal University of Rio Grande do Sul20 enrolled

Overview

Objective: To compare the effects of a protective versus a conventional ventilatory strategy, on systemic and in lung production of tumor necrosis factor-alpha (TNF-alpha) and interleukin-8 (IL-8) in patients without lung disease. Hypothesis: High tidal volumes induce inflammation in patients without lung disease Design: Prospective control-randomized study. Patients and Setting: Twenty patients without lung disease and submitted to mechanical ventilation admitted to one trauma and one general adult intensive care unit of two different university hospitals. Interventions: Patients were randomized to receive mechanical ventilation either with tidal volume (VT) of 10-12 ml/kg predicted body weight (high VT group) or with VT of 5-7 ml/kg predicted body weight (low VT group) with an O2 inspiratory fraction (FIO2) enough to keep arterial oxygen saturation \> 90% with positive end-expiratory pressure (PEEP) of 5 cmH2O during 12 hours after admission to the study.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

SUPPORTIVE_CARE

Masking

NONE

Enrollment

Conditions

Mechanically Ventilated Patients Normal Lungs

Interventions

Low tidal volumePROCEDURE

twenty patients were randomly (opaque sealed envelopes) assigned to receive mechanical ventilation in volume-controlled mode either with VT of 10-12 ml/kg predicted body weight (high VT group, n=10) or with VT of 5-7 ml/kg predicted body weight (low VT group, n=10) with an inspiratory fraction of oxygen (FIO2) set at the minimal level at which an arterial oxygen saturation of \> 90% and minimal PEEP (4-5cmH2O). The predicted body weight of male patients was calculated as equal to 50+0.91(centimeters of height-152.4); that of female patients was calculated as equal to 45.5+0.91(centimeters of height-152.4).

Low tidal volumePROCEDURE

Immediately after ICU admission, once all inclusion and exclusion criteria were met and consent obtained, twenty patients (16 men, 4 women, median age of 49 yrs) were randomly (opaque sealed envelopes) assigned to receive mechanical ventilation in volume-controlled mode either with VT of 10-12 ml/kg predicted body weight (high VT group, n=10) or with VT of 5-7 ml/kg predicted body weight (low VT group, n=10) with an inspiratory fraction of oxygen (FIO2) set at the minimal level at which an arterial oxygen saturation of \> 90% and minimal PEEP (4-5cmH2O). The predicted body weight of male patients was calculated as equal to 50+0.91(centimeters of height-152.4); that of female patients was calculated as equal to 45.5+0.91(centimeters of height-152.4)

low tidal volumeOTHER

tidal volume of 5-7 ml/kg predicted body weight

Eligibility

Sex: ALLMin age: 16 Years

Medical Language ↔ Plain English

Inclusion Criteria: 1. age ≥ 16 years; 2. anticipated survival \> 24 hours; 3. need for mechanical ventilation for at least 12 hours and 4. hemodynamic stability (MAP\>65 mmHg, HR\<100 beats/min, diuresis \> 1 ml/kg/h, no catecholamine requirement or fluid challenge). Exclusion Criteria: 1\. history of any lung disease, use of immunosuppressive medication, recent infections, previous thromboembolic disease, recent ventilatory support, and participation in another clinical trial. Absence of lung disease was defined by the following clinical criteria: (a) no evidence of respiratory infection (white blood cell count \<10x103/µl, temperature \> 380C, purulent sputum), (b) normal chest roentgenogram, (c) PaO2/FIO2 ratio \> 300, (d) and a normal clinical respiratory history.

High Tidal Volume Induces Inflammation In Normal Lungs

Overview

Conditions

Interventions

Eligibility

Locations (2)

Outcomes

Primary Outcomes