CRAT Patient Monitoring and Safety 2 — Questions and Answers
Question 1: When attaching cardiac monitoring electrodes, which skin preparation step is most important to reduce artifact?
- Cleaning and lightly abrading the skin to remove oils and dead cells before electrode placement (Correct answer)
- Applying additional electrode gel over the electrode
- Placing electrodes over hairy areas without preparation
- Using cold water to clean the skin
Correct answer: Cleaning and lightly abrading the skin to remove oils and dead cells before electrode placement
Proper skin preparation by cleaning with an alcohol swab and lightly abrading the skin significantly reduces electrode-skin impedance, improving signal quality and reducing artifact.
Electrode-skin impedance is the primary cause of poor ECG signal quality. Skin oils, dead cells, and moisture create resistance that reduces signal amplitude and increases artifact. Preparation includes wiping with an alcohol pad to remove oils, gentle abrasion with the abrasive side of the electrode or gauze, and allowing the skin to dry briefly before applying fresh electrodes. In hairy areas, clipping (not shaving) hair improves contact.
Question 2: Current of microampere levels that may cause cardiac fibrillation when applied directly to the heart through invasive catheters is called what?
- Microshock (Correct answer)
- Macroshock
- Defibrillation
- Cardioversion
Correct answer: Microshock
Microshock refers to small electrical currents (as low as 10-100 microamperes) that can trigger ventricular fibrillation when applied directly to the heart via invasive lines or cardiac catheters, bypassing normal skin resistance.
The skin normally requires 100 mA or more to cause VF (macroshock). However, when current is applied directly to the myocardium via central venous catheters, pacing wires, or cardiac catheters, as little as 10-100 microamperes can induce VF (microshock). Prevention includes using electrically isolated equipment, maintaining proper grounding, using isolation transformers in critical care areas, and ensuring all equipment touching patients in CCU is grounded.
Question 3: During continuous cardiac monitoring, an alarm is triggered for a critical low heart rate. What should the monitor technician do first?
- Assess the patient clinically and notify the nurse or clinician immediately (Correct answer)
- Silence the alarm and continue monitoring
- Adjust the alarm threshold upward
- Assume it is a false alarm due to artifact
Correct answer: Assess the patient clinically and notify the nurse or clinician immediately
A critical alarm must always prompt immediate patient assessment — alarms should never be silenced without clinical evaluation, as critical bradycardia may represent a life-threatening rhythm.
The Joint Commission has emphasized alarm fatigue as a significant patient safety issue. However, the correct response to any critical alarm is clinical assessment first — confirm the patient's hemodynamic status, check consciousness, verify lead connections, and notify the clinical team immediately for critical values. Repeatedly silencing alarms without investigation is a patient safety failure that has resulted in preventable deaths.
Question 4: Why should the defibrillator be kept readily accessible near monitored patients in the cardiac care unit?
- Life-threatening arrhythmias such as VF or pulseless VT can occur without warning and require immediate defibrillation (Correct answer)
- It is used routinely for pacemaker programming
- It improves ECG signal quality
- It is required for blood pressure monitoring
Correct answer: Life-threatening arrhythmias such as VF or pulseless VT can occur without warning and require immediate defibrillation
Immediate defibrillation within the first minutes of VF is the most critical determinant of survival, so defibrillators must be immediately available in monitored care settings.
In monitored settings, VF can be identified immediately on the rhythm strip. Survival depends entirely on the speed of defibrillation — each minute without shock reduces survival 7-10%. Institutional protocols require defibrillators within 3 minutes in all areas with monitored patients. Monitor technicians play a critical role in identifying shockable rhythms and triggering rapid response before permanent anoxic brain injury occurs.
Question 5: When a patient with a pacemaker is receiving electrocautery during surgery, which pacemaker problem can occur?
- Oversensing of electrocautery current causing pacemaker inhibition (Correct answer)
- Permanent pacemaker reprogramming to a faster rate
- Immediate battery depletion
- Loss of pacing lead insulation
Correct answer: Oversensing of electrocautery current causing pacemaker inhibition
Electrosurgical (Bovie) current can be sensed by the pacemaker as cardiac activity (oversensing), inhibiting pacing output — dangerous in pacemaker-dependent patients who may develop bradycardia or asystole.
Electrocautery generates high-frequency electrical current that modern pacemakers can detect as cardiac signals. This oversensing inhibits pacing output. In pacemaker-dependent patients, this can cause asystole. Precautions include placing the cautery grounding pad as far from the pacemaker as possible, using short bursts of cautery, using bipolar cautery when possible, and applying a magnet to switch the pacemaker to asynchronous mode during surgery.
Question 6: A monitor shows a sudden change to a flat line in one lead. What is the first action a rhythm technician should take?
- Check the patient directly and verify electrode and lead connections before calling a code (Correct answer)
- Immediately call a code blue
- Apply defibrillator pads
- Call the physician without verifying the lead
Correct answer: Check the patient directly and verify electrode and lead connections before calling a code
A flat line must be verified as a true rhythm rather than artifact by checking the patient, the electrodes, and the connections in all leads before escalating to a code response.
Protocol for flat line alarm: first, look at the patient (are they talking? breathing?), then assess the monitor (is only one lead flat? check other leads), check electrode connections, replace any disconnected leads. If the patient is unresponsive and multiple leads show asystole, activate emergency response immediately. Acting on a false alarm wastes resources; missing true asystole is fatal. Verify before calling — but verify rapidly.
CRAT Patient Monitoring and Safety 2
When attaching cardiac monitoring electrodes, which skin preparation step is most important to reduce artifact?