CMC Quality Assurance & Improvement 2 — Questions and Answers
Question 1: Which metric is considered the gold standard for measuring door-to-balloon time in STEMI care?
- Time from ED arrival to PCI wire crossing (Correct answer)
- Time from symptom onset to reperfusion
- Time from ECG acquisition to cath lab activation
- Time from EMS contact to hospital arrival
Correct answer: Time from ED arrival to PCI wire crossing
Door-to-balloon time is measured from ED arrival to first balloon inflation (or wire crossing), the standard ACC/AHA benchmark being ≤90 minutes.
Question 2: A cardiac care unit notices a spike in central-line-associated bloodstream infections (CLABSIs). Which QI approach is most appropriate to identify root causes?
- Run chart analysis followed by a fishbone diagram (Correct answer)
- Implement immediate antibiotic prophylaxis for all patients
- Remove all central lines and switch to peripheral access
- Conduct a peer review of individual nurse performance
Correct answer: Run chart analysis followed by a fishbone diagram
Run charts visualize trends over time, and fishbone (Ishikawa) diagrams systematically identify root causes — a standard QI pairing for infection spikes.
Question 3: In the context of cardiac quality improvement, what does the term 'reliability' refer to?
- The percentage of eligible patients who receive a recommended evidence-based intervention (Correct answer)
- The accuracy of diagnostic equipment in detecting arrhythmias
- The consistency of nursing staff scheduling in the ICU
- The reproducibility of echocardiographic measurements between sonographers
Correct answer: The percentage of eligible patients who receive a recommended evidence-based intervention
Reliability in QI is the rate at which a care system delivers an evidence-based process to every patient who should receive it, targeting near-100% compliance.
Question 4: A hospital is using the Plan-Do-Study-Act (PDSA) cycle. In which phase would the team pilot a new rapid-response protocol on one unit?
- Do (Correct answer)
- Plan
- Study
- Act
Correct answer: Do
The 'Do' phase is where the planned change is executed or piloted, typically on a small scale before broader rollout.
Question 5: Which of the following is an example of a balancing measure in a cardiac QI project aimed at reducing unnecessary telemetry use?
- Rate of missed arrhythmia events after protocol change (Correct answer)
- Number of telemetry beds freed per month
- Percentage of patients monitored per ACC guidelines
- Cost savings achieved by reducing monitor usage
Correct answer: Rate of missed arrhythmia events after protocol change
Balancing measures detect unintended harm from an improvement intervention — here, missed arrhythmias would signal that reduced monitoring caused patient safety gaps.
Question 6: The Society of Thoracic Surgeons (STS) National Database is primarily used for which quality improvement purpose?
- Benchmarking cardiac surgical outcomes against national risk-adjusted norms (Correct answer)
- Tracking individual surgeon malpractice claims
- Monitoring real-time intraoperative hemodynamics
- Auditing hospital billing codes for cardiac procedures
Correct answer: Benchmarking cardiac surgical outcomes against national risk-adjusted norms
The STS National Database enables hospitals to compare their risk-adjusted outcomes (mortality, morbidity, complication rates) against national benchmarks to drive quality improvement.
Question 7: Which statistical tool is most useful for distinguishing common-cause variation from special-cause variation in cardiac quality data?
- Statistical process control (SPC) chart (Correct answer)
- Pareto chart
- Scatter diagram
- Histogram
Correct answer: Statistical process control (SPC) chart
SPC charts (control charts) use control limits to identify whether variation is random (common-cause) or due to a specific assignable cause (special-cause), guiding appropriate responses.
CMC Quality Assurance & Improvement 2
Which metric is considered the gold standard for measuring door-to-balloon time in STEMI care?