What should a respiratory therapist conclude if they observe a very flat pressure-volume loop during VC A/C ventilation?

The observation of a very flat pressure-volume loop during volume control assist/control (VC A/C) ventilation typically indicates issues with lung compliance or resistance. In this context, the best approach would be to determine the patient’s static compliance, which reflects the distensibility of the lungs. A flat loop often signifies low compliance, suggesting the lungs are stiff or there is a potential issue with airway resistance.

While changing the scale of the volume axis on the graph (the selected answer) might allow for better visualization of the data, it does not provide any substantial clinical information or an appropriate course of action to address the underlying issue indicated by the flat loop. The use of dynamic compliance assessment and checking plateau pressures can yield more relevant information, enabling the therapist to understand the patient's respiratory mechanics more effectively.

Determining the patient's static compliance involves measuring the pressure during a period of no airflow and is essential to evaluate the effectiveness of the ventilation strategy currently being utilized. It allows the therapist to make informed decisions about possible adjustments to the mode of ventilation or other interventions to optimize the patient's respiratory status.