Radiology findings and non-invasive ventilation response.

There is a considerable variation in NIV among hospitals, regions and countries although it is a simple and useful method. The patient should be monitored via subjective response (respiratory distress, consciousness, problems related to mask and airflow), physiological responses (respiration rate, respiratory effort, air leakage) and patient-ventilator compliance (gas exchange, pulse oximetry, arterial blood gases). Normalization in respiration rate within 1 or 2 hours after initiation of treatment is one of the most important markers for recovery. The goal is to maintain respiration rate between 20 and 30 breaths/minute. Reduction in intercostal and supraclavicular retractions, paradoxical respiration and sympathetic activity indicate success of treatment. Arterial blood gases are measured within first 2 hours in order to assess pH and CO2; and as needed thereafter. In general, NIV is assessed by arterial blood gases, hemodynamic parameters and several laboratory tests. There is limited number of studies in NIV. Here, we aimed to assess radiological implications of gas distribution within lung tissue during NIV therapy.