Faculty Bibliography

OBJECTIVES/OBJECTIVE:To determine whether use of a stylus user input device (UID) would be superior to a mouse for CMR segmentation. METHODS:Twenty-five consecutive clinical cardiac magnetic resonance (CMR) examinations were selected. Image analysis was independently performed by four observers. Manual tracing of left (LV) and right (RV) ventricular endocardial contours was performed twice in 10 randomly assigned sessions, each session using only one UID. Segmentation time and the ventricular function variables were recorded. The mean segmentation time and time reduction were calculated for each method. Intraclass correlation coefficients (ICC) and Bland-Altman plots of function variables were used to assess intra- and interobserver variability and agreement between methods. Observers completed a Likert-type questionnaire. RESULTS:The mean segmentation time (in seconds) was significantly less with the stylus compared to the mouse, averaging 206±108 versus 308±125 (p<0.001) and 225±140 versus 353±162 (p<0.001) for LV and RV segmentation, respectively. The intra- and interobserver agreement rates were excellent (ICC≥0.75) regardless of the UID. There was an excellent agreement between measurements derived from manual segmentation using different UIDs (ICC≥0.75), with few exceptions. Observers preferred the stylus. CONCLUSION/CONCLUSIONS:The study shows a significant reduction in segmentation time using the stylus, a subjective preference, and excellent agreement between the methods. KEY POINTS/CONCLUSIONS:• Using a stylus for MRI ventricular segmentation is faster compared to mouse • A stylus is easier to use and results in less fatigue • There is excellent agreement between stylus and mouse UIDs.

Acute pulmonary embolism (PE) is the third most common cause of death among hospitalized patients. Treatment escalation beyond anticoagulation therapy is necessary in patients with cardiogenic shock and may be of benefit in select normotensive patients with right heart strain. Percutaneous catheter-based techniques (catheter-directed mechanical thrombectomy, clot maceration, and/or pharmacologic thrombolysis) as an alternative or adjunct to systemic thrombolysis can rapidly debulk central clot in patients with shock. Catheter-directed thrombolysis, which uses a low-dose intraclot prolonged thrombolytic infusion, is a promising but insufficiently studied therapy for patients presenting with acute intermediate-risk PE.

PURPOSE: To determine treatment preferences among endovascular and medical physicians who manage acute submassive pulmonary embolism (PE). MATERIALS AND METHODS: From July through August 2016, 83 sites across the United States were surveyed, and 60 completed the survey. Endovascular and medical physicians were asked to rate their predilection for catheter-directed thrombolysis (CDT) on a 5-point scale and for systemic thrombolysis (ST) as "yes" or "no" in seven case scenarios of submassive PE. A CDT score >/= 4 was considered to represent a predilection for CDT. Mean scores were used to compare CDT preferences between physicians. Percentages of physicians who preferred CDT or ST were calculated. P values < .05 were considered statistically significant. RESULTS: Across all scenarios (numbered S1-S7) combined, endovascular physicians had a significantly higher CDT score (mean, 3.52) than medical physicians (mean, 3.01; P < .0001). Scenario-by-scenario analysis revealed that the mean CDT score was significantly higher for endovascular physicians (S1, 4.25; S2, 3.72; S3, 2.82; S4, 2.68; S5, 3.45; S6, 3.67; S7, 4.02) compared with medical physicians (S1, 3.62 [P < .001]; S2, 3.18 [P < .001]; S3, 2.45 [P = .001]; S4, 2.37 [P = .011]; S5, 2.97 [P < .001]; S6, 3.20 [P < .001]; S7, 3.53 [P < .001]). Overall, a significantly higher percentage of endovascular physicians (56.7%) indicated a predilection for CDT compared with medical physicians (37.9%; P < .001). Also, a significantly higher percentage of physicians, regardless of specialty, indicated a predilection for CDT (47.2%) than did for ST (5.3%; P < .0001). CONCLUSIONS: Endovascular physicians exhibited a greater predilection for CDT to treat acute submassive PE compared with their medical colleagues. Endovascular and medical physicians seemed to more frequently choose CDT than ST.

Interventional radiology (IR) has evolved into a full-fledged clinical specialty with attendant comprehensive patient care responsibilities. Providing excellent and thorough clinical care is as essential to the practice of IR as achieving technical success in procedures. Basic clinical skills that every interventional radiologist should learn include routine management of percutaneously inserted drainage and vascular catheters and rapid effective management of common systemic post-procedural complications. A structured approach to post-procedural care, including routine follow-up and early identification and management of complications, facilitates efficient and thorough management with an emphasis on quality and patient safety. The aim of this second part, in conjunction with part 1, is to complete the comprehensive review of post-procedural care in patients undergoing interventional radiology procedures. We discuss common problems encountered after insertion of drainage and vascular catheters and describe effective methods of troubleshooting these problems. Commonly encountered systemic complications in IR are described, and ways for immediate identification and management of these complications are provided.

Interventional radiology (IR) has evolved into a full-fledged clinical specialty with attendant patient care responsibilities. Success in IR now requires development of a full clinical practice, including consultations, inpatient admitting privileges, and an outpatient clinic. In addition to technical excellence and innovation, maintaining a comprehensive practice is imperative for interventional radiologists to compete successfully for patients and referral bases. A structured approach to periprocedural care, including routine follow-up and early identification and management of complications, facilitates efficient and thorough management with an emphasis on quality and patient safety.

Hyperparathyroidism is an excess of parathyroid hormone in the blood due to over-activity of one or more parathyroid gland. Localization of abnormal glands with noninvasive imaging modalities, such as technetium sestamibi scan and cross-sectional imaging, has a high success rate. Parathyroid venous sampling is performed for patients with persistent or recurrent disease after previous parathyroid surgery, when repeat noninvasive imaging studies are negative or discordant. The success of invasive localization studies and results interpretation is dependent on the interventional radiologist's understanding of the normal and ectopic anatomic locations of parathyroid glands, as well as their blood supply and venous drainage. Anatomic and technical considerations for selective parathyroid venous sampling are reviewed.