It may be assumed that 250 mmHg suction pressure, via compliance with open system suction method related procedures, is being more effective and equally safe for secretion cleaning in comparison to the 80 and 150 mmHg suction pressures.

55% of the patients were male, 61.7% were older than 65 years and 38.32% had lung infection.

The amount of suctioned secretions tended to increase significantly with increasing negative pressure and there was a significant difference between the pressures in terms of the median volume of suctioned secretions (p < 0.001). This study was planned as a prospective, experimental, self-controlled design. The study sample included 47 patients.

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