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Modern [[ventilators|lung ventilators]] are able to generate three basic wave forms of flow: [[Square wave|squared]] waveform, descending waveform, and [[sinusoidal]] waveform. A square waveform pattern is found on most mechanical ventilators, old and new, and achieves a constant flow.
During the inspiration phase, the flow rate rises to a predetermined level and remains constant, thus giving the appearance of a square wave form. This produces the shortest inspiratory time compared to other flow patterns. A decelerating flow waveform pattern, also known as descending ramp, achieves the highest level of flow at the start of a breath, when patient flow demand is often greatest.<ref>{{cite web |title=A Review of Waveform Patterns for Mechanically Ventilated Patients: Constant Flow Versus Decelerating-Flow Waveform Patterns |url=http://www.rtmagazine.com/2012/01/a-review-of-waveform-patterns-for-mechanically-ventilated-patients-constant-flow-versus-decelerating-flow-waveform-patterns/ |website=RT Magazine |date=12 January 2012 |accessdate=15 February 2019}}</ref>
==See also==
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