- During routine maintenance, an EKG technician notices that the paper advance mechanism intermittently jams, causing uneven paper feed rates. The paper roll is properly loaded and the feed rollers appear clean. Inspection reveals small paper fragments and adhesive residue in the paper path. What is the most appropriate maintenance procedure?
Answer: Use compressed air to blow out debris, then clean the paper path with alcohol and cotton swabs
Compressed air followed by alcohol cleaning is the appropriate method for removing paper fragments and adhesive residue from the paper path. This thoroughly cleans without damaging sensitive mechanisms. Option A is incorrect because lubricants can attract more debris and may interfere with paper grip. Option C doesn't address the existing contamination in the paper path and different paper brands may not solve the underlying problem. Option D is incorrect because manual cycling may worsen the jam and spread adhesive residue further into the mechanism.
- An EKG technician performs weekly calibration verification and discovers that the 25 mm/sec paper speed is actually running at 23 mm/sec, while the 50 mm/sec setting runs at 46 mm/sec. Both settings show proportionally similar deviations. What does this pattern indicate about the required maintenance?
Answer: The timing crystal or internal clock reference needs calibration or replacement due to frequency drift
Both speeds showing the same proportional deviation (approximately 8% slow) indicates a systematic timing error, most likely from timing crystal or clock reference drift. This affects all time-based functions equally. Option A is incorrect because mechanical resistance would typically affect higher speeds more than lower speeds due to increased load. Option C is wrong because excessive paper tension would cause more irregular speed variations rather than consistent proportional errors. Option D is incorrect because print head temperature affects print quality, not the fundamental timing mechanisms that control paper speed.
- An EKG technician notices that after cleaning the patient cable with approved disinfectant wipes, the cable insulation has become slightly sticky and attracts lint and debris. The cable still functions normally and passes electrical safety tests. What maintenance approach best addresses this issue?
Answer: Switch to a different EPA-approved disinfectant that is specifically compatible with cable insulation materials
The sticky residue indicates the current disinfectant is chemically incompatible with the cable insulation, causing surface degradation. Switching to a compatible disinfectant prevents further damage while maintaining infection control. Option A is incorrect because talcum powder can interfere with electrical connections and create additional contamination. Option B doesn't address the chemical incompatibility causing the problem. Option C is premature since the cable still functions normally; the issue can be prevented with proper disinfectant selection.
- During routine maintenance inspection, an EKG technician discovers that the machine's cooling fan is making intermittent grinding noises and running slower than normal, but the internal temperature readings remain within acceptable limits. The machine is scheduled for continuous use over the next 48 hours due to a staff shortage. What is the most appropriate immediate action?
Answer: Replace the cooling fan immediately before returning the machine to service, regardless of current temperature readings
Fan failure during heavy use could cause rapid overheating and potential patient safety issues or equipment damage. Preventive replacement is safer than risking failure during critical operations. Option A is risky because fan failure could cause rapid temperature rise that might not be detected quickly enough. Option B doesn't eliminate the risk of fan failure and may not meet patient care needs. Option D is inappropriate because most modern cooling fans are sealed units not designed for field lubrication, and this doesn't address underlying bearing wear.
- A hospital's infection control policy requires EKG machines to be disinfected with quaternary ammonium compounds between patients. After several weeks of following this protocol, the technician notices that the LCD display has become cloudy and some button labels are fading. What maintenance modification would best address this issue while maintaining infection control compliance?
Answer: Use quaternary ammonium compounds only on patient contact surfaces and alcohol wipes for display and controls
Using different cleaning agents for different surfaces optimizes both infection control and equipment preservation. Quaternary ammonium compounds are excellent for patient contact surfaces but can damage plastics and displays over time. Alcohol is gentler on electronic displays and controls while still providing adequate disinfection for non-patient-contact surfaces. Option A is incorrect because alcohol alone may not meet infection control requirements for patient contact areas. Option B doesn't address the root cause and adds maintenance complexity. Option D is incorrect because reduced contact time may compromise disinfection efficacy regardless of drying method.
- An EKG technician notices that the calibration pulse on their machine consistently measures 8 mm instead of the standard 10 mm after completing routine cleaning with 70% isopropyl alcohol. The paper speed and all other settings appear normal. What is the most likely cause and appropriate next step?
Answer: The gain/sensitivity setting has been altered; verify and adjust the gain to proper calibration
A calibration pulse measuring 8 mm instead of 10 mm indicates the gain/sensitivity is set incorrectly (likely at 0.8 mV/mm instead of 1.0 mV/mm). This is a machine setting issue unrelated to cleaning. Option A is incorrect because alcohol cleaning doesn't typically damage print heads, and this wouldn't affect calibration pulse height. Option C is wrong because paper misalignment affects paper feed, not calibration amplitude. Option D is incorrect because electrode cable issues would affect patient signal quality, not the machine's internal calibration pulse.
- After replacing the power cord on an EKG machine due to damage, the technician notices increased 60 Hz interference on all recorded tracings, despite proper electrode placement and skin preparation. The machine's electrical safety testing shows normal ground resistance. What additional maintenance step is most likely needed?
Answer: Verify that the replacement power cord has proper medical-grade shielding and is correctly grounded to the chassis
A replacement power cord must have proper medical-grade shielding and correct chassis grounding to prevent AC interference. Non-medical grade cords may lack adequate shielding or have improper ground connections, leading to 60 Hz pickup. Option B is incorrect because internal filters are factory-calibrated and don't require adjustment for power cord changes. Option C addresses symptoms rather than the root cause and patient cables weren't changed. Option D is wrong because CMRR is a fixed circuit characteristic, not an adjustable setting, and the ground reference should be established by proper power cord grounding.
- An EKG machine displays an error message indicating 'Lead Wire Impedance High' after routine cleaning and maintenance. The technician verifies that all connections are secure and electrodes are properly attached to a test patient. The machine was functioning normally before maintenance. What is the most likely cause of this error?
Answer: Moisture from the cleaning process has penetrated the lead wire connectors causing increased resistance
Moisture penetration into lead wire connectors during cleaning is the most likely cause of high impedance readings that appear after maintenance. Water increases electrical resistance at connection points. Option A is incorrect because cleaning solution residue would more likely cause low impedance or electrical interference rather than high impedance. Option C is wrong because the question states electrodes are properly attached, and skin preparation would normalize impedance. Option D is incorrect because temperature-related calibration drift would affect multiple parameters, not specifically lead wire impedance measurements.
- During preventive maintenance, an EKG technician finds that the machine's internal memory shows 847 stored ECGs from the past month, approaching the 1000-record storage limit. The hospital's policy requires maintaining tracings for 30 days before archival. What is the most appropriate maintenance action?
Answer: Export all stored records to the hospital's EMR system, verify successful transfer, then clear the internal memory
When you encounter questions about EKG machine data management, think about maintaining data integrity while following hospital policies and proper archival procedures. The key is ensuring no patient data is lost while resolving the storage issue.
Answer A is correct because it follows the complete chain of proper data management: export ensures data preservation, verification confirms the transfer was successful, and clearing the memory only happens after confirming the data is safely stored elsewhere. This approach maintains the 30-day retention requirement while preventing data loss and resolving the storage capacity issue.
Answer B is problematic because immediately deleting records without proper archival could result in permanent data loss. Even if these are the "oldest" records, they may still be within the required 30-day retention period, and deletion without backup violates data management protocols.
Answer C attempts to solve the problem by reducing the retention period, but this violates the established 30-day hospital policy. EKG technicians don't have authority to unilaterally change institutional data retention policies, and doing so could create compliance issues.
Answer D delays necessary action and may be unnecessary. While memory upgrades might help long-term, the immediate issue is approaching the storage limit. Waiting for biomedical engineering could result in reaching capacity before a solution is implemented, potentially causing the machine to malfunction or refuse new recordings.
Remember: On CET exam questions about data management, always prioritize solutions that preserve patient data integrity while following established protocols. The safest approach involves backup, verification, then action.
- During equipment maintenance, an EKG technician discovers that the suction bulbs on several chest electrodes have lost their elasticity and no longer maintain proper contact. The metal clips appear clean and undamaged. What is the most appropriate maintenance action to ensure optimal signal quality?
Answer: Replace the complete electrode assemblies including both suction bulbs and metal clips as integrated units
Complete electrode assemblies should be replaced as integrated units when suction bulbs lose elasticity. This ensures proper impedance matching and reliable contact pressure for accurate signal acquisition. Option A is incorrect because additional gel cannot compensate for poor mechanical contact from failed suction. Option B is wrong because suction bulbs and clips are typically manufactured as matched units for optimal electrical and mechanical performance. Option C is incorrect because alcohol can further degrade rubber/plastic elasticity, and manual stretching will not restore proper elastic properties.
