NPF involves using selective external stimuli to reflexively assist respiration in unconscious patients. It can be used for those who are unconscious, have neurological deficits, are partially breathing, or on a ventilator. Contraindications include fractures to the rib cage or spine, children, and respiratory failure. Techniques include perioral stimulation to initiate epigastric movement, thoracic vertebral pressure over T2-T4 to increase abdominal excursion and over T9-T11 to increase thoracic movement, anterior stretch lift of the basal area to increase rib movement, intercostal stretching to increase epigastric movement and general respiration, co-contraction of abdominal pressure to increase excursion and stimulate coughing