Mobile aortic atheroma and systemic emboli: efficacy of anticoagulation and influence of plaque morphology on recurrent stroke.

OBJECTIVES: We sought to determine the influence of plaque morphology and warfarin anticoagulation on the risk of recurrent emboli in patients with mobile aortic atheroma. BACKGROUND: An epidemiologic link between aortic atheroma and systemic emboli has been described both in pathologic and transesophageal studies. Likewise, a few studies have found an increased incidence of recurrent emboli in these patients. The therapeutic implications of these findings has not been studied. METHODS: Thirty-one patients presenting with a systemic embolic event and found to have mobile aortic atheroma were studied. The height, width and area of both immobile and mobile portions of atheroma were quantitated. The dimensions of the mobile component was used to define three groups: small, intermediate and large mobile atheroma. The patients were followed up by means of telephone interview and clinical records, with emphasis on anticoagulant use and recurrent embolic or vascular events. RESULTS: Patients not receiving warfarin had a higher incidence of vascular events (45% vs. 5%, p = 0.006). Stroke occurred in 27% of these patients and in none of those treated with warfarin. The annual incidence of stroke in patients not taking warfarin was 0.32. Myocardial infarction occurred in 18% of patients also in this group. Taken together, the risk of myocardial infarction or stroke was significantly increased in this group (p = 0.001). Forty-seven percent of patients with small, mobile atheroma did not receive warfarin. Recurrent stroke occurred in 38% of these patients, representing an annual incidence of 0.61. There were no strokes in patients with small, mobile atheroma treated with warfarin (p = 0.04). Likewise, none of the patients with intermediate or large mobile atheroma had a stroke during follow-up. Only three of these patients had not been taking warfarin. CONCLUSIONS: Patients presenting with systemic emboli and found to have mobile aortic atheroma on transesophageal echocardiography have a high incidence of recurrent vascular events. Warfarin is efficacious in preventing stroke in this population. The dimension of the mobile component of atheroma should not be used to determine the need for anticoagulation.

The use of antibiotics to prevent serious sequelae in children at risk for occult bacteremia: a meta-analysis.

OBJECTIVE: To determine whether antibiotics prevent serious bacterial infections in children at risk for occult bacteremia. METHODS: Meta-analysis of randomized controlled trials involving children aged 3 months to 36 months without a focus of infection and randomized into 2 treatment groups: 1) no antibiotic vs antibiotic or 2) IM ceftriaxone vs oral antibiotic. RESULTS: The use of either an oral antibiotic or IM ceftriaxone did trend toward a reduced risk of serious infection, although neither reached statistical significance (OR = 0.60; 95% CI 0.10, 3.49; and OR = 0.38; 95% CI 0.12, 1.17, respectively). It would be necessary to treat 414 patients to prevent 1 serious bacterial infection. When only children with proven occult bacteremia were analyzed, the use of IM ceftriaxone was statistically significant in preventing serious bacterial infections (OR = 0.25; 95% CI 0.07, 0.89). CONCLUSIONS: Clinical judgment should not be replaced by widespread antibiotic use in the approach to a child with fever. If rapid methods to identify children with occult bacteremia, such as polymerase chain reaction, could be improved and become widely available, then antibiotics could be used judiciously on initial visits. Antibiotic use in all children at risk for occult bacteremia implies the treatment of many children unlikely to benefit from such therapy.

Metoclopramide, thickened feedings, and positioning for gastro-oesophageal reflux in children under two years.

BACKGROUND: Gastro-esophageal reflux (GER) is the refluxing of gastric contents into the esophagus. Fifty per cent of all infants 0 to 3 months regurgitate at least once a day. This drops to 5% once infants are 10 to 12 months old. Three per cent of parents of 10 to 12 month old infants view this as a problem. OBJECTIVES: To investigate the effectiveness of thickened feeds, positioning, and metoclopramide as compared to placebo in improving the outcome of GER in developmentally normal infants aged one month to two years. SEARCH STRATEGY: We searched the Cochrane Central Register of Controlled Trials (The Cochrane Library 2003), MEDLINE (January 1966 to 23 January 2003), EMBASE (January 1985 to 27 January 2003), and reference lists of articles. SELECTION CRITERIA: Randomised studies (parallel or cross over) which evaluated thickened feeds, positional alternations or metoclopramide for the treatment of GER in children between the age of one month and two years who were developmentally normal. DATA COLLECTION AND ANALYSIS: All three reviewers independently assessed trial quality and extracted data. Study authors were contacted for additional information. Adverse effects information was collected from the trials. MAIN RESULTS: Twenty trials involving 771 children met the inclusion criteria: eight dealt with thickened feeds, five with positioning, and seven with metoclopramide. Few comparisons could be made, and so summary measures were often made with two or three studies. Thickened feeds reduce the regurgitation severity score (standardized mean difference (SMD) -0.94;95% confidence interval -1.35 to -0.52), as well as the frequency of emesis (SMD -0.91; confidence interval -1.22 to -0.61). The reflux index was not reduced (weighted mean difference (WMD) 0.48%; 95% confidence interval-3.27 to 4.23). All five positioning studies utilized esophageal pH monitoring as their outcome measure. Elevating the head of the crib for treating reflux in the supine position is not justifiable. The seven metoclopramide studies used a variety of outcomes. Compared to placebo, metoclopramide appears to reduce daily symptoms ( SMD -0.73; 95% confidence interval -1.16 to -0.30), and reduce the reflux index (WMD -2.80%; 95% confidence interval -5.58 to -0.01). It does increase side effects. REVIEWERS' CONCLUSIONS: Thickened feeds are helpful in reducing the symptoms of GER. Elevating the head of the crib in the supine position does not have any effect. Metoclopramide may have some benefit in comparison to placebo in the symptomatic treatment for GER, but that must be weighed against possible side effects. .

Unsuspected articulation side-strut extension during stenting in a tortuous right coronary artery.

This case report demonstrates the effect of articulation stent-strut extension during attempts to deploy a stent in a tortuous, calcified right coronary artery. The manipulation of the stent-sheath relationship and the effect of a tortuous, calcified artery produced serial dissections resulting in the implantation of three stents to seal the dissection. Caution should be used when employing rigid sheathed stent systems through tortuous vessels.

Hemodynamic rounds series II: Coronary hemodynamics for angioplasty and stenting after myocardial infarction: use of absolute, relative coronary velocity and fractional flow reserve.

The application of absolute coronary velocity reserve, relative coronary velocity reserve, and pressure-derived fractional flow reserve of the myocardium may have influence on decision making for angioplasty and stenting in patients after myocardial infarction. This case highlights the use and limitations of these techniques in the setting of myocardial infarction where absolute coronary flow reserve may be commonly compromised. The role for absolute, relative coronary, and fractional flow reserve are discussed.

Nebulized budesonide and oral dexamethasone for treatment of croup: a randomized controlled trial.

CONTEXT: The effectiveness of glucocorticoids for patients with croup is well established but it remains uncertain which glucocorticoid regimen is most effective. OBJECTIVE: To determine the effectiveness of 3 glucocorticoid regimens in patients with croup. DESIGN: Randomized controlled trial with parallel design. SETTING: Emergency departments of 2 Canadian pediatric tertiary care hospitals. PARTICIPANTS: Children with a clinical syndrome consistent with croup, aged 3 months to 5 years, with a croup score of 2 or greater following at least 15 minutes of mist therapy. INTERVENTIONS: Oral dexamethasone, 0.6 mg/kg, and nebulized placebo; oral placebo and nebulized budesonide, 2 mg; or oral dexamethasone, 0.6 mg/kg, and nebulized budesonide, 2 mg. MAIN OUTCOME MEASURES: Westley croup score (primary outcome), hospital admission rates, time spent in the emergency department, return visits to the emergency department, or ongoing symptoms at 1 week. RESULTS: The mean change in the croup score from baseline to the final study assessment was -2.3 (95% confidence interval [CI], -2.6 to -2.0) in the budesonide group (n = 65), -2.4 (95% CI, -2.6 to -2.2) in the dexamethasone group (n = 69), and -2.4 (95% CI, -2.7 to -2.1) in the budesonide and dexamethasone group (n = 64, P = .70). CONCLUSIONS: Based on the similar outcomes in the 3 groups, oral dexamethasone is the preferred intervention because of its ease of administration, lower cost, and more widespread availability.

Abnormal coronary flow velocity reserve after coronary artery stenting in patients: role of relative coronary reserve to assess potential mechanisms.

BACKGROUND: Absolute coronary flow velocity reserve (CVR) after stenting may remain abnormal as a result of several different mechanisms. Relative CVR (rCVR=CVR(target)/CVR(reference)) theoretically normalizes for global microcirculatory disturbances and facilitates interpretation of abnormal CVR. METHODS AND RESULTS: To characterize potential mechanisms of poststent physiology, CVR was measured using a Doppler-tipped angioplasty guidewire in 55 patients before and after angioplasty, after stenting, and in an angiographically normal reference vessel. For the group, the percent diameter stenosis decreased from 75+/-13% to 40+/-18% after angioplasty and to 10+/-9% (all P<0.05) after stent placement. After angioplasty, CVR increased from 1.63+/-0.71 to 1.89+/-0.55 (P<0.05) and after stent placement, to 2.48+/-0.75 (P<0.05 versus pre- and postangioplasty). After angioplasty, rCVR increased from 0.64+/-0.26 to 0.75+/-0.23 and after stent placement to 1.00+/-0.34. In 17 patients with CVR(stent) < or = 2.0, increased basal coronary flow, rather than attenuated hyperemia, was responsible in large part for the lower CVR(stent) compared with patients having CVR(stent) >2.0. In 8 patients with CVR(stent) <2.0, a normal rCVR supported global microvascular disease. The subgroup of 9 patients with CVR(stent) <2.0 and abnormal rCVR (16% of the studied patients) may require a pressure-derived fractional flow reserve to differentiate persistent obstruction from diffuse atherosclerotic disease or microvascular stunning. CONCLUSIONS: Although a majority of patients after stenting normalize CVR for the individual circulation (ie, normal CVR or normal rCVR), in those with impaired CVR(stent), the analysis of coronary flow dynamics suggests several different physiological mechanisms. Additional assessment may be required to fully characterize the physiological result for such patients to exclude remediable luminal abnormalities.