Some theories are so attractive that they are nearly irresistible. No matter how many times they are disproven, these theories still seem compelling. One example is double-coverage for pseudomonas. Recently, the IDSA recommended this for ventilator-associated PNA (VAP), despite openly admitting that RCTs found it to be ineffective.
PDF) Ventilator-associated pneumonia rates and distribution of causative microorganisms in the second stage intensive care unit
PulmCrit- The siren's call: Double-coverage for ventilator
PulmCrit- Six myths promoted by the new surviving sepsis guidelines
Pneupac Patient Circuits by Smiths Medical
Community-Onset Pneumonia From Dr. Farkas' Internet Book Of Critical Care - Tom Wade MD
Single Limb Ventilator Circuit, Adult
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Single Limb Circuit for Pneupac Demand Ventilators (P200) – Nine Group International
Ventilator Associated Pneumonia (VAP) - EMCrit Project