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Patient Monitoring Systems Flashcards

7 cards from real CBET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A BMET is troubleshooting a ventilator patient monitor that shows erratic tidal volume readings. The flow sensor passes bench testing. What is the NEXT most logical step?

    Answer: Inspect the flow sensor for moisture condensation or secretion buildup in-line

    Moisture and secretion buildup inside inline flow sensors is a common cause of erratic volume readings in ventilated patients.

  2. What does a pulmonary artery catheter (Swan-Ganz) measure when the balloon is inflated and wedged?

    Answer: Pulmonary artery occlusion pressure (PAOP), reflecting left heart filling pressure

    When wedged, the inflated balloon occludes forward flow, allowing the distal port to sense pressure that reflects left atrial and left ventricular end-diastolic pressure.

  3. A patient monitor's non-invasive blood pressure (NIBP) module consistently reads 20 mmHg higher than manual auscultation. Which factor is MOST likely responsible?

    Answer: Cuff is undersized relative to the patient's arm circumference

    An undersized cuff over-compresses peripheral tissue, requiring greater cuff pressure to occlude the artery and producing falsely elevated readings.

  4. When zeroing an invasive pressure transducer, the transducer stopcock must be positioned at the phlebostatic axis. Where is this anatomical landmark?

    Answer: Level of the right atrium, at the 4th intercostal space mid-axillary line

    The phlebostatic axis represents the right atrium level (4th ICS, mid-axillary line) and is the standard external reference for cardiac pressure monitoring.

  5. A BMET is setting up a new ECG monitor and must select the correct filter mode. When would you use 'diagnostic mode' rather than 'monitoring mode'?

    Answer: When accurate ST-segment morphology analysis is required

    Diagnostic mode uses a wider bandwidth (0.05–150 Hz) to preserve ST-segment morphology, while monitoring mode applies filters that can distort the ST segment.

  6. A hospital is evaluating near-infrared spectroscopy (NIRS) cerebral oximetry monitors. Which clinical scenario represents the PRIMARY intended application for these devices?

    Answer: Detecting regional cerebral oxygen desaturation during cardiac surgery or carotid endarterectomy

    NIRS cerebral oximetry is primarily used to detect regional cerebral hypoxia during procedures with risk of cerebral ischemia, such as cardiac surgery with cardiopulmonary bypass.

  7. A multi-parameter bedside monitor fails electrical safety testing with a chassis leakage current of 750 µA. Per AAMI ES1 standards for patient care equipment, what is the maximum allowable chassis leakage current in normal condition?

    Answer: 500 µA

    AAMI ES1 specifies a maximum chassis (enclosure) leakage current of 500 µA under normal conditions for patient care equipment.