Maximum Expiratory Pressure is measured in which unit?

Maximum Expiratory Pressure is measured in which unit?

• A. centimeters of water (cm H2O)
• B. millimeters of mercury (mmHg)
• C. kilopascals (kPa)
• D. psi

Answer: (A)

Maximum Expiratory Pressure is a small airway pressure, so it’s expressed in centimeters of water (cm H2O). This unit is the standard for measuring respiratory pressures because it matches the scale of pressures generated by the lungs and airway muscles and is used by clinical equipment like manometers and ventilators. Other units, such as millimeters of mercury (mmHg), kilopascals (kPa), or psi, are used in different contexts (blood pressure or larger gas pressures) and don’t align with the typical respiratory pressure measurements.

Maximum Expiratory Pressure is a small airway pressure, so it’s expressed in centimeters of water (cm H2O). This unit is the standard for measuring respiratory pressures because it matches the scale of pressures generated by the lungs and airway muscles and is used by clinical equipment like manometers and ventilators. Other units, such as millimeters of mercury (mmHg), kilopascals (kPa), or psi, are used in different contexts (blood pressure or larger gas pressures) and don’t align with the typical respiratory pressure measurements.