Question 1: What is the typical frequency range of an ECG amplifier's bandwidth for diagnostic-quality monitoring?

• 0.5-40 Hz
• 0.05-150 Hz (Correct answer)
• 1-500 Hz
• 10-1000 Hz

Correct answer: 0.05-150 Hz

Diagnostic-quality ECG requires 0.05-150 Hz bandwidth to capture all waveform components accurately.

Monitoring mode (0.5-40 Hz) can distort ST segments, potentially masking ischemia. Biomedical technicians must verify frequency response using ECG simulators during PM.

Question 2: What does NIBP stand for and what method do most patient monitors use to measure it?

• Non-Invasive Blood Pressure - oscillometric method detecting arterial wall oscillations in an inflated cuff (Correct answer)
• Neural Impulse Blood Pressure - direct nerve stimulation
• Nominal Internal Blood Pressure - catheter-based measurement
• Non-Indexed Baseline Pressure - calculated from heart rate

Correct answer: Non-Invasive Blood Pressure - oscillometric method detecting arterial wall oscillations in an inflated cuff

NIBP (Non-Invasive Blood Pressure) uses the oscillometric method, detecting pressure oscillations as the cuff deflates.

MAP is the most accurate directly-measured value. Common issues include air leaks in cuff/tubing and algorithm errors with arrhythmias or excessive motion.

Question 3: What is the purpose of the central monitoring station in a patient monitoring system?

• To store all hospital medical records
• To display and monitor multiple patients' vital signs simultaneously from a central location (Correct answer)
• To control all medical equipment
• To manage medication dispensing

Correct answer: To display and monitor multiple patients' vital signs simultaneously from a central location

A central station receives and displays real-time vital signs from multiple bedside monitors for simultaneous observation.

Features include full-disclosure waveform storage, arrhythmia detection, and alarm notification via pagers/phones. Downtime reduces monitoring capability for the entire unit.

Question 4: When troubleshooting a patient monitor displaying 'Lead Off' for ECG, what should a biomedical technician check?

• The monitor software version
• The electrode contact quality, lead wire integrity, and cable connections from patient to monitor (Correct answer)
• The monitor battery level
• The room temperature

Correct answer: The electrode contact quality, lead wire integrity, and cable connections from patient to monitor

'Lead Off' means a break in the electrical circuit between the patient's skin and the ECG amplifier input.

Simulate a known-good signal using an ECG simulator to isolate whether the issue is patient-side or monitor-side. Repeated lead-off issues with a specific cable model may indicate a design problem.

Question 5: What parameter does capnography monitor and what is the normal end-tidal CO2 (EtCO2) range for a healthy adult?

• Blood oxygen levels, 95-100%
• Exhaled carbon dioxide concentration, 35-45 mmHg (Correct answer)
• Inhaled oxygen concentration, 21%
• Respiratory muscle effort, 10-20 cmH2O

Correct answer: Exhaled carbon dioxide concentration, 35-45 mmHg

Capnography monitors CO2 concentration in exhaled breath. Normal EtCO2 is 35-45 mmHg.

Two configurations: mainstream (sensor at airway) and sidestream (gas sampled to remote sensor). Biomedical technicians calibrate with known CO2 concentration gas during PM.

Question 6: What is the difference between invasive and non-invasive blood pressure monitoring, and when is invasive monitoring preferred?

• Invasive is less accurate but faster
• Invasive uses an arterial catheter and transducer for continuous beat-to-beat monitoring in hemodynamically unstable patients (Correct answer)
• Invasive uses a larger cuff
• There is no clinical difference

Correct answer: Invasive uses an arterial catheter and transducer for continuous beat-to-beat monitoring in hemodynamically unstable patients

Invasive monitoring uses an arterial catheter connected to a pressure transducer for continuous real-time measurement.

Biomedical technicians verify transducer accuracy using a calibrated pressure source. Staff must be educated on proper leveling (phlebostatic axis) and zeroing procedures.

Question 7: What is a telemetry monitoring system and how does it differ from bedside monitoring?

• Telemetry is more accurate
• Telemetry uses portable wireless transmitters on ambulatory patients, sending ECG data to a central station (Correct answer)
• Telemetry only works in operating rooms
• Telemetry uses wired connections

Correct answer: Telemetry uses portable wireless transmitters on ambulatory patients, sending ECG data to a central station

Telemetry uses small portable wireless transmitters enabling continuous monitoring while patients walk around.

Biomedical technician responsibilities include battery management, antenna placement optimization, signal quality troubleshooting, and lead wire maintenance.

Question 8: What are the common sources of artifact in ECG monitoring and how can they be minimized?

• Artifact only comes from equipment malfunction
• Common sources include muscle tremor, movement, poor electrode contact, 60Hz interference, and respiratory drift, minimized through proper skin preparation (Correct answer)
• Artifact is unavoidable
• Only EMI causes artifact

Correct answer: Common sources include muscle tremor, movement, poor electrode contact, 60Hz interference, and respiratory drift, minimized through proper skin preparation

ECG artifact comes from multiple sources that can be minimized through proper electrode application and environmental controls.

Biomedical technicians should understand these artifacts to differentiate equipment problems from application issues and educate clinical staff on proper electrode technique.

Question 9: What is pulse transit time and how are newer patient monitors using it?

• The time between two heartbeats
• The time for a pulse wave to travel between two arterial sites, being explored for continuous cuff-less blood pressure estimation (Correct answer)
• The time a pulse oximeter takes to display
• The time between ECG spike and respiration

Correct answer: The time for a pulse wave to travel between two arterial sites, being explored for continuous cuff-less blood pressure estimation

PTT inversely correlates with blood pressure and enables continuous cuff-less BP estimation.

Limitations include periodic recalibration requirements, variable accuracy across patient populations, and sensitivity to vasomotor tone changes.

Question 10: Why is it important to verify alarm settings on a patient monitor at the beginning of each patient encounter?

• Alarms are preset and never need adjustment
• Alarm limits must be individualized to prevent missed events and alarm fatigue from false alarms (Correct answer)
• Alarms are only important in the ICU
• Default settings are always appropriate

Correct answer: Alarm limits must be individualized to prevent missed events and alarm fatigue from false alarms

Alarm limits must be individualized because default or previous patient settings may not be appropriate.

Studies show 85-99% of monitor alarms are non-actionable. Biomedical technicians contribute through configuring default settings, maintaining notification systems, and supporting alarm data analysis.

Question 11: What is the function of a fetal monitor and what two primary parameters does it continuously measure?

• Maternal blood pressure and fetal weight
• Fetal heart rate (FHR) and uterine contraction activity (tocometry) (Correct answer)
• Fetal blood oxygen and respiratory rate
• Maternal ECG and fetal movement

Correct answer: Fetal heart rate (FHR) and uterine contraction activity (tocometry)

A fetal monitor (cardiotocograph) measures fetal heart rate using Doppler ultrasound and uterine contractions using a tocodynamometer.

Normal FHR is 110-160 bpm. Biomedical technicians verify FHR accuracy using a fetal simulator and calibrate toco sensitivity during PM.

Question 12: What is bispectral index (BIS) monitoring and what does it measure?

• Blood flow velocity in cerebral arteries
• A processed EEG parameter that quantifies anesthesia depth on a scale of 0 to 100 (Correct answer)
• Bilateral blood pressure comparison
• Binocular visual stimulus response

Correct answer: A processed EEG parameter that quantifies anesthesia depth on a scale of 0 to 100

BIS analyzes brain electrical activity to provide a single number representing consciousness level for guiding anesthesia depth.

BIS target for general anesthesia is 40-60. Clinical benefits include reduced anesthetic agent use and decreased risk of intraoperative awareness.

Question 13: A capnograph displays an abnormally low ETCO2 reading with a shark-fin waveform shape. What condition does this most likely indicate?

• Hyperventilation
• Bronchospasm or partial airway obstruction (Correct answer)
• Esophageal intubation
• Pulmonary embolism

Correct answer: Bronchospasm or partial airway obstruction

A shark-fin capnogram waveform indicates obstructed exhalation, classically seen in bronchospasm or COPD exacerbation.

Question 14: During routine calibration of a bedside monitor's SpO2 sensor, a BMET notices the oximeter reads 98% on a patient confirmed by ABG to have SaO2 of 84%. What is the most likely cause?

• Faulty photodetector
• Elevated carboxyhemoglobin levels (Correct answer)
• Low ambient light interference
• Incorrect wavelength LED aging

Correct answer: Elevated carboxyhemoglobin levels

Pulse oximetry cannot differentiate oxyhemoglobin from carboxyhemoglobin, causing falsely elevated SpO2 readings in CO poisoning.

Question 15: A nurse reports that a patient's invasive arterial line is showing an overdamped waveform. Which of the following is the BEST corrective action?

• Increase the flush bag pressure above 300 mmHg
• Check for air bubbles, clots, or kinked tubing in the system (Correct answer)
• Replace the transducer with a higher compliance model
• Reposition the transducer above the phlebostatic axis

Correct answer: Check for air bubbles, clots, or kinked tubing in the system

Overdamping is most commonly caused by air bubbles, clots, or mechanical occlusion that attenuates pressure wave transmission.

Question 16: What is the primary purpose of the fast flush test (square wave test) performed on an invasive hemodynamic monitoring system?

• To verify accurate zero reference at the phlebostatic axis
• To assess the dynamic frequency response and damping coefficient of the system (Correct answer)
• To detect electrical interference from nearby equipment
• To confirm catheter patency before blood draw

Correct answer: To assess the dynamic frequency response and damping coefficient of the system

The square wave test evaluates dynamic response by analyzing the oscillations after a fast flush to determine if the system is adequately damped.

Question 17: A neonatal ICU monitor alarm activates for a SpO2 reading of 80%. The BMET verifies equipment function is normal. What physiological artifact is LEAST likely responsible?

• Motion artifact from infant movement
• Peripheral vasoconstriction reducing perfusion
• Elevated fetal hemoglobin concentration (Correct answer)
• Probe placed on an edematous extremity

Correct answer: Elevated fetal hemoglobin concentration

Fetal hemoglobin (HbF) has similar optical absorption properties to adult hemoglobin at standard oximetry wavelengths and does not significantly cause inaccurate SpO2 readings.

Question 18: A telemetry technician reports frequent ST-segment false alarms on a cardiac monitor. Which monitor setting change would BEST reduce these false alarms while maintaining clinical sensitivity?

• Increase the ST alarm threshold by 2 mV
• Switch to a monitoring lead that provides a more stable baseline for that patient (Correct answer)
• Disable the ST analysis algorithm
• Reduce the ECG gain setting to 5 mm/mV

Correct answer: Switch to a monitoring lead that provides a more stable baseline for that patient

Selecting an optimal lead with a cleaner isoelectric baseline reduces motion-induced ST baseline wander without compromising detection sensitivity.

Question 19: Which parameter does a Bispectral Index (BIS) monitor measure to assess depth of anesthesia?

• End-tidal anesthetic agent concentration
• Processed electroencephalographic (EEG) activity (Correct answer)
• Cerebral oximetry via near-infrared spectroscopy
• Neuromuscular blockade train-of-four ratio

Correct answer: Processed electroencephalographic (EEG) activity

BIS monitors analyze and process raw EEG signals to produce a dimensionless index (0–100) correlating with level of consciousness.