Invasive hemodynamic characteristics in patients with mitral annular calcification related mitral stenosis and chest radiation.

Quantification of invasive hemodynamics and mitral annular calcification-related mitral stenosis remains underexplored in patients exposed to chest radiation. We sought to explore invasive hemodynamic parameters via transseptal catheterization in patients with and without chest radiation who had a diagnosis of mitral annular calcification-related mitral stenosis. After excluding patients with more than moderate mitral regurgitation, we found that there was no difference in mitral valve area on hemodynamic testing in patients with and without radiation with an elevated baseline transmitral gradient on transthoracic echocardiography in the setting of mitral annular calcification-related mitral stenosis. There was a higher transmitral gradient and left atrial pressure in patients with prior radiation consistent with left atrial noncompliance, suggesting that treatment mitral valve stenosis may not relieve symptoms in this cohort of patients.

A Quality Improvement Approach to Decrease the Utilization of Docusate in Hospitalized Patients.

BACKGROUND AND OBJECTIVES: Docusate sodium is a commonly prescribed medication to relieve constipation, but several studies have demonstrated its ineffectiveness. Its continued use in the hospital setting adds unnecessary cost and risk to patients. At the Mayo Clinic Florida campus, docusate was ordered for 9.7% of patients admitted to the internal medicine resident (IMED) teaching services during the month of January 2020, and the average hospital length of stay (LOS) was 3.1 days. METHODS: A multidisciplinary team of internal medicine resident physicians and pharmacists collaborated to address this quality gap through a quality improvement project. It sought to reduce the number of patients admitted to the IMED teaching services who had an order placed for docusate by 50% in less than 6 months without adversely impacting hospital LOS. Two separate interventions were devised using Six Sigma methodology and implemented to reduce the frequency of docusate orders, which involved educating internal medicine residents and hospital pharmacists, and creating an additional process-related barrier to docusate orders. RESULTS: The percentage of docusate orders decreased from 9.7% to 2.4% ( P = .004) with a grossly unchanged LOS of 3.1 days to 2.7 days ( P = .12) after 5 weeks. CONCLUSION: The implementation of a dual-pronged intervention successfully decreased the use of an ineffective medication in hospitalized patients without impacting the balancing measure, and serves as a model that can be adopted at other institutions with the hope of promoting evidence-based medical care.

Atrial Arrhythmia Ablation in Patients With D-Transposition of the Great Arteries and Atrial Switch.

BACKGROUND: Patients with D-transposition of the great arteries and atrial switch have a high incidence of atrial arrhythmias. We sought to analyze the arrhythmia substrate, ablation strategies, and outcomes for catheter ablation in this population. METHODS: An in-depth analysis of all clinical and procedural data in patients with D-transposition of the great arteries, atrial baffles, and atrial arrhythmia ablation was performed. RESULTS: A cohort of 32 patients (72% male, mean age 38±7 years) underwent ablation for non-AV nodal reentrant tachycardia atrial arrhythmias, and 4 patients underwent AV nodal reentrant tachycardia ablation. Cavotricuspid isthmus flutter (CTI-flutter) was the most common arrhythmia, encountered in 75% of patients, followed by scar-related intraatrial reentrant tachycardia (non-CTI intraatrial reentrant tachycardia, 53%) and focal atrial tachycardia (focal atrial tachycardia, 6%). Among the 32 patients, 26 underwent 31 procedures at our institution. For patients with prior outside intervention, the index ablation at our institution revealed CTI-dependent flutter in 3/5 cases. However, redo ablation after an index ablation with demonstrated bidirectional CTI block revealed different/new arrhythmia substrates (80% non-CTI intraatrial reentrant tachycardia, 40% focal atrial tachycardia). Achieving bidirectional block across the CTI often required ablating on both sides of the baffle (retroaortic access, 81%; using a baffle leak, 11.5%; or transbaffle puncture, 7.7%). Combined approaches were necessary in 19% to reach the critical tissue. Acute procedural success was 81%, and recurrence was documented in 58% of patients. Despite recurrence, clinical arrhythmia burden was significantly reduced post-ablation (P<0.001), with rare episodes, amenable to antiarrhythmic therapy. Redo ablation was required in 5 (19%) patients and uncovered new arrhythmia substrates. AV nodal reentrant tachycardia ablation also required transbaffle approaches in 3/4 patients. CONCLUSIONS: CTI-dependent flutter was the most common arrhythmia in patients with Dextro-Transposition of the Great Arteries and atrial switch. Transbaffle approaches were often necessary, and, provided that bidirectional CTI block was achieved at the index ablation, late recurrence was due to different arrhythmia mechanisms. Despite recurrence, ablation was associated with significant clinical improvement.

Transcatheter Mitral Valve Repair Using MitraClip in Secondary Mitral Valve Regurgitation Guided by Real-Time Pressure-Volume Loops.

Worsening of left ventricular (LV) function is a potential complication after repair of secondary mitral valve regurgitation, and one which has limited methods for predicting its risk of occurrence. We present a case utilizing real-time pressure-volume loops intraprocedurally to monitor hemodynamic changes before and after application of a trancatheter MitraClip device in a patient with severe symptomatic secondary mitral regurgitation (MR). Worsening of LV function is a potential complication after repair of secondary mitral valve regurgitation. We present a case utilizing real-time pressure-volume loops intraprocedurally to monitor hemodynamic changes before and after application of a transcatheter MitraClip device in a patient with severe symptomatic secondary MR.