Calcium Channel Blocker Overdose: What Role Does Extracorporeal Membrane Oxygenation Have in Support? A Systematic Review of the Literature.

Extracorporeal membrane oxygenation (ECMO) has had increasing prevalence and indications in the last decade. Calcium channel blocker overdose (CCBOD) can lead to significant cardiopulmonary dysfunction and has also increased in recent years. CCBOD results in cardiac depression, vasoplegia, and hyperglycemia. Expert consensus recommends treatment with calcium, high-dose insulin, inotropes, and vasopressors. Our systematic review evaluated when to initiate ECMO in the CCBOD population and the mortality rate associated with use. Electronic literature review identified all relevant studies for CCBOD and ECMO. PRISMA guidelines for systematic review were followed. Three independent authors reviewed abstracts and full texts, and only CCB ingestion without polypharmacy was included. Two authors independently collected data, which included demographics, current medical treatments, ECMO type, and survival. From 314 abstracts, 25 papers were included with a median publication year of 2019. Twenty-six patients were included with an average age of 32.7 years and 42%/58% male/female. Average time on ECMO 4.3 days. VA and VV ECMO use were 92.3% and 7.7%, respectively, and 84.6% of patients survived to hospital discharge. Before ECMO, most patients received 4-5 medical treatments (53.8%). Our systematic review demonstrates ECMO is a newly used, yet valuable therapy for CCBOD when medical treatment fails. Survival to discharge after ECMO for CCBOD is substantially higher than standard VV or VA ECMO. Medical management is still the mainstay therapy for CCBOD, but we show that a persistently unstable patient may benefit from prompt evaluation at an ECMO center for treatment.

Wear analysis in THA utilizing oxidized zirconium and crosslinked polyethylene.

UNLABELLED: Oxidized zirconium, a material with a ceramic surface on a metal substrate, and highly cross-linked polyethylene are two materials developed to reduce wear. We measured in vivo femoral head penetration in patients with these advanced bearings. We hypothesized the linear wear rates would be lower than those published for cobalt-chrome and standard polyethylene. We retrospectively reviewed a select series of 56 THAs in a relatively young, active patient population utilizing oxidized zirconium femoral heads and highly cross-linked polyethylene acetabular liners. Femoral head penetration was determined using the Martell computerized edge-detection method. All patients were available for 2-year clinical and radiographic followup. True linear wear was 4 microm/year (95% confidence intervals, +/- 59 microm/year). The early wear rates in this cohort of relatively young, active patients were low and we believe justify the continued study of these alternative bearing surfaces. LEVEL OF EVIDENCE: Level IV, therapeutic study. See the Guidelines for Authors for a complete description of levels of evidence.

Femoral head size and wear of highly cross-linked polyethylene at 5 to 8 years.

UNLABELLED: Wear of highly cross-linked polyethylene is reportedly independent of head size. To confirm that observation we asked in our population whether head size related to wear with one type of electron beam highly cross-linked polyethylene. Of 146 hips implanted, we evaluated complete clinical and radiographic data for 90 patients (102 hips or 70%). The minimum followup was 5 years (mean, 5.7 years; range, 5-8 years). The head size was selected intraoperatively based on the size of the acetabular component and presumed risk of dislocation. Polyethylene wear measurements were performed in one experienced laboratory using the method of Martell et al. There was no hip with pelvic or femoral osteolysis. The median linear wear rate was 0.028 mm/year (mean, 0.04 mm/year), and the median volumetric wear rate was 25.6 mm(3)/year (mean, 80.5 mm(3)/year). Median total volumetric wear was 41.0 mm(3) (mean, 98.5 mm(3)). We found no association between femoral head size and the linear wear rate, but observed an association between larger (36- and 40-mm) head size and volumetric wear rate and total volumetric wear. Although the linear wear rate of polyethylene was not related to femoral head diameter, there was greater volumetric wear (156.6 mm(3)/year) with the 36- and 40-mm heads. Pending long-term studies of large head sizes, we advise caution in using larger femoral heads in young or active patients and in those with a low risk of dislocation. LEVEL OF EVIDENCE: Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.

Novel Educational Module for Subclavian Central Venous Catheter Insertion Using Real-Time Ultrasound Guidance.

OBJECTIVE: Given increasing evidence supporting a real-time ultrasound (US)-guided approach for subclavian vein (SCV) central venous catheter (CVC) insertion as compared with the traditional landmark approach, we sought to develop a standardized curriculum to offer healthcare providers a means to attain increased competency and confidence in US-guided SCV CVC insertion. DESIGN: Retrospective review of prospectively collected data. SETTING: Single institution's American College of Surgeons Level 1 Accredited Education Institute within an academic tertiary care center. SUBJECTS: A total of 77 residents and midlevel providers working in our surgical intensive care unit. INTERVENTIONS: Providers participated in a tiered educational module designed to teach safe US-guided SCV CVC insertion. The education consisted of a multimedia didactic presentation and a hands-on simulation session, including US anatomy on live subjects and anatomical model-based SCV CVC insertion. MEASUREMENTS AND MAIN RESULTS: Assessment of the effect of education included a written examination and confidence survey, administered pre- and postintervention, and videotaped simulation session graded by blinded expert evaluators. Of the 77 participants, 70 participants completed a posttest with a median 5-point increase in score compared with that of the pretest score (p < 0.0001). Confidence ratings based on a 5-point Likert scale demonstrated an increase in confidence in SCV CVC insertion (p < 0.0001), using the landmark approach (p < 0.0001), using US-guided approach (p < 0.0001), and in use of US to image the SCV (p < 0.0001). Postgraduate year-1 residents had lower mean global rating score (p = 0.010) than any other participants. CONCLUSIONS: This comprehensive hands-on teaching module-based curriculum enhanced learner knowledge of and confidence in US-guided SCV CVC insertion. This module can be implemented in simulation centers for teaching safe and successful SCV CVC insertion.

A complex injury of the distal ulnar physis: a case report and brief review of the literature.

Physeal fractures of the distal forearm are common injuries in children and adolescents. However, Salter-Harris type III and type IV fractures of the distal ulnar epiphysis are often high-energy injuries that require open reduction for restoration of anatomical alignment. These injuries are uncommon and there are few descriptions of them in the contemporary literature. Here we report the case of a 13-year-old boy with a type IV distal ulna fracture not diagnosed with standard radiography. After closed manipulation, an incompletely reduced physis was suspected on the basis of fluoroscopic imaging and comparison radiographs of the contralateral wrist. Computed tomography showed a large, displaced physeal fragment. The patient underwent open reduction and internal fixation. Thorough radiographic assessment should be conducted when there is a high suspicion for these fracture patterns. Appropriate diagnosis can lead to expedient reduction and expectant management of sequelae associated with these injuries.