The Effects of Intravenous Levofloxacin on the QT Interval and QT Dispersion

The QT dispersion (QT_d) is a non-invasive means of identifying those patients at an increased risk of developing sudden cardiac death (SCD). Although levofloxacin has a minimal effect on the QT_c interval, isolated reports of QT prolongation, polymorphic ventricular tachycardia with a normal QT interval and TdP have been reported. The purpose of this study was to examine the effect of intravenous levofloxacin on the QT interval and QT_d. Of the 50 patients who were deemed candidates to receive intravenous levofloxacin, 29 met the eligibility criteria and were enrolled in this study. A 12-lead ECG was performed before the initiation of levofloxacin (baseline), and on days 3 and 5. The QT^c _min, QT^c _max and the QT_d were calculated. Measurements where made by two independent observers blinded to the patients’ clinical status. The QT_d increased significantly on days 3 and 5 following the initiation of therapy [QT_d (baseline) 33.3 ± 20 ms, QT_d (day 3) 64.4 ± 31.3 ms (p = 0.023), QT_d (day 5) 66.8 ± 20.3 ms, (p = 0.008)]. The increase in the QT_d was significantly longer in men than women. Although women had a shorter baseline QT_d compared to men, this did not achieve statistical significance. Intravenous levofloxacin was found to significantly increase the QT_d, which was more pronounced in men compared to women. Its effect on the QT_d may increase the risk of developing a potentially fatal ventricular arrhythmia. Therefore, care must be taken when prescribing this medication to patients with a pre-existing risk of developing SCD.     

Endovascular therapy for critical limb ischemia

AbstractChronic critical limb ischemia (CLI) occurs when arterial perfusion is reduced below a threshold level that results in rest pain and/or tissue breakdown in the lower extremities. Importantly, it is associated with high cardiovascular morbidity and mortality. Without prompt revascularization, CLI may result in loss of a limb (i.e. amputation) and/or life. The goal of endovascular therapy is the re-establishment of pulsatile, straight-line flow to the distal extremity. Percutaneous transluminal angioplasty (PTA) has been shown to be effective and safe in the setting of CLI, with limb salvage rates that compare favorably with surgical procedures. Stents are indicated for failed PTA, while adjunctive therapies such as lasers, thermal angioplasty and atherectomy devices lack data demonstrating improved efficacy compared with conventional lower extremity interventions. In addition to successful revascularization, the institution of lifestyle changes, atherosclerotic risk factor modification, and pharmacologic therapies are indicated to reduce cardiovascular morbidity and mortality.     

Childhood Apraxia of Speech (CAS) in two patients with 16p11.2 microdeletion syndrome

We report clinical findings that extend the phenotype of the ∼550 kb 16p11.2 microdeletion syndrome to include a rare, severe, and persistent pediatric speech sound disorder termed Childhood Apraxia of Speech (CAS). CAS is the speech disorder identified in a multigenerational pedigree (‘KE'') in which half of the members have a mutation in FOXP2 that co-segregates with CAS, oromotor apraxia, and low scores on a nonword repetition task. Each of the two patients in the current report completed a 2-h assessment protocol that provided information on their cognitive, language, speech, oral mechanism, motor, and developmental histories and performance. Their histories and standard scores on perceptual and acoustic speech tasks met clinical and research criteria for CAS. Array comparative genomic hybridization analyses identified deletions at chromosome 16p11.2 in each patient. These are the first reported cases with well-characterized CAS in the 16p11.2 syndrome literature and the first report of this microdeletion in CAS genetics research. We discuss implications of findings for issues in both literatures.     

Benign lymphoid hyperplasia manifesting as a cecal mass: Report of a case

Summary We have presented an unusual case of benign lymphoid hyperplasia, which manifested as a cecal deformity in a 15-year-old boy. The clinical manifestation may have been related to partial occlusion of the appendiceal orifice. In future cases of benign lymphoid hyperplasia, colonoscopy may be diagnostic, and if it is used for continuing observation, may avert unnecessary surgical procedures in children and young adults.     

Fundoplication for gastroesophageal reflux disease: regional variability and factors predicting operative approach

We have recently shown that the majority of patients undergoing fundoplication in the United States are women. Based on these findings, we hypothesized that nonbiological factors contribute to the decisions on surgical reflux therapy. Using State Inpatient Databases of the Agency for Healthcare Research and Quality, we extracted annual fundoplication rates, sex distribution, age cohorts, racial background, and insurance coverage. To account for potential differences in state populations, the results were normalized and correlated with Census data, adult obesity rates, median income, poverty rates, and physician workforce within the state. Fundoplication rates varied fivefold between states, ranging from 4.1 ± 0.1 per 100 000 in New Jersey to 21.8 ± 0.4 per 100 000 in Oregon. Higher poverty rates and a higher fraction of Caucasians within a state independently predicted higher fundoplication rates. While the majority of operations were performed laparoscopically, surgical approaches also differed between states with rates of laparoscopic ranging from 52.3 ± 1.8% in Oklahoma to 87.4 ± 1.7% in Hawaii. A lower number of pediatric and Medicaid‐insured patient and a higher fraction of privately insured patients best predicted higher rates of laparoscopic surgery. Our study shows significant regional variation in surgical reflux management, which cannot be explained by differences in disease mechanisms. Insurance coverage and racial background influenced the likelihood of surgery, suggesting a role of financial incentives.