Clinical Scorecard: Evaluation of 24/7 Clinical Utilization of Computed Tomography Pulmonary Angiography with Customized Scanning Protocols: A Five-Year Observational Analysis of Repeat Scan Incidence and Underlying Factors

At a Glance

Key Highlights

• CTPA is the diagnostic tool of choice for pulmonary embolism due to high sensitivity and specificity but requires precise contrast timing for diagnostic-quality images.
• Individualized contrast material injection protocols based on bodyweight and tube voltage reduce contrast volume and radiation dose while maintaining diagnostic image quality.
• Repeat CTPA scans are often required due to non-diagnostic initial scans, mainly caused by poor contrast timing and patient-related factors, increasing patient radiation and contrast exposure.

Guideline-Based Recommendations

Diagnosis

• Use CTPA as the first-line diagnostic tool for suspected pulmonary embolism in emergency settings.
• Ensure precise timing of contrast material peak density in pulmonary arteries during scan acquisition to achieve diagnostic-quality images.

Management

• Apply individualized contrast material injection protocols adjusting volume and flow rate based on patient bodyweight and automated tube voltage selection.
• Utilize scanner automation and vendor recommendations for scan acquisition and image reconstruction parameters to optimize image quality and minimize radiation dose.

Monitoring & Follow-up

• Monitor repeat scan incidence to assess adequacy of initial CTPA scans and optimize protocols accordingly.
• Evaluate image quality focusing on pulmonary arterial attenuation and presence of motion artifacts or patient-related factors affecting scan quality.

Risks

• Recognize that repeat CTPA scans increase patient exposure to contrast material and radiation.
• Be aware of patient-related factors such as motion artifacts and breathing maneuvers that can compromise scan quality.

Patient & Prescribing Data

Patients undergoing CTPA for suspected pulmonary embolism across a 5-year period in routine clinical practice.

Individualized contrast protocols based on bodyweight and tube voltage effectively reduce contrast volume and radiation dose while maintaining diagnostic image quality, but require careful timing to minimize repeat scans.

Clinical Best Practices

• Implement individualized contrast material injection protocols using the 10-to-10 rule to adjust iodine delivery based on tube voltage and patient bodyweight.
• Use automated tube voltage selection and current modulation to optimize radiation dose and image quality.
• Employ test bolus techniques and scanner automation to improve contrast timing and reduce non-diagnostic scans.
• Continuously monitor and analyze repeat scan rates to identify and address underlying causes of non-diagnostic imaging.

References

• 1. CTPA as diagnostic tool for pulmonary embolism
• 4,5. Causes of non-diagnostic CTPA scans
• 14,20,22,23. Individualized contrast protocols and 10-to-10 rule