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Biomedical subjects

J C Dillon

Publications and source records attributed to J C Dillon.

At least 19 recordsLinked to original sources

[Breastfeeding in developing countries: update and current recommendations].

Data from numerous surveys conducted by UNICEF using standardized methods in most developing countries over the last 10 years now enable evaluation of the status of breastfeeding in the world. The purpose of this report is to present findings concerning the duration of exclusive breastfeeding, appropriate complementary feeding, and continued breastfeeding after 6 months. Analysis of these data indicates that progress is being made but that various problems remain. In an effort to improve the situation, the WHO/UNICEF has undertaken a number of initiatives and issued several recommendations.

Adult↗

[Progress in the world health status of children during the period 1990-2000].

Multiple Indicator Cluster Surveys (MICS) conducted by UNICEF using standardized methods in 66 countries have provided data for evaluating the status of child health during the period between 1990 and 2000. This report presents findings on mortality in children less than 5 years of age, malnutrition indicators, immunization status and integrated management of childhood illness. It is concluded that children at the dawn of the 21st century are exposed to new risks related to poverty, war, violence, urbanization, and VIH/AIDS.

Acquired Immunodeficiency Syndrome↗

Incidence of thrombocytopenia following coronary stent placement using abciximab plus clopidogrel or ticlopidine.

The incidence of thrombocytopenia with ticlopidine and clopidogrel when used in conjunction with abciximab has not been systematically addressed. We evaluated the rate of thrombocytopenia in patients undergoing intracoronary stent implantation receiving bolus plus infusion of abciximab and either ticlopidine or clopidogrel. We noted an incidence of 24% with the combination of 300-mg clopidogrel and abciximab. Other doses of ticlopidine (250 and 500 mg) and clopidogrel (75 mg) did not result in a statistically significant increase in thrombocytopenia over that of the 2.5%-5.2% reported incidence with abciximab alone. Length of hospital stay was 2.3 vs. 6.4 days in those developing thrombocytopenia (P = 0.06). Four (25%) developed thrombocytopenia requiring blood transfusion. Eight (50%) had no sequelae. The combination of 300-mg clopidogrel and abciximab results in a significant increase in the incidence of thrombocytopenia. This is an important clinical observation that merits further study.

Abciximab↗

Reproductive failure in women living in iodine deficient areas of West Africa.

OBJECTIVES: To investigate the association between iodine status and reproductive failure in a population of West African women. DESIGN: Epidemiological survey on iodine deficiency disorders carried out in 1996-1997. SETTING: The iodine deficient areas of Senegal (Casamance and Senegal Oriental). POPULATION: Four thousand nine hundred and eighty women, aged 10 to 50, of whom 1,544 adolescent and 462 pregnant women were examined for thyroid size and urinary iodine excretion. Their iodine status was associated with their fertility rate and reproductive failures. RESULTS: Reproductive failure (defined as repeated miscarriages and stillbirth) was associated with low iodine status, with severe iodine deficiency increasing the risk. Poor nutritional status and illiteracy had a significant effect on the outcome of pregnancy: underweight women had a fourfold higher risk, and those who were illiterate an eightfold higher risk, of failed pregnancy, compared with nutritionally healthy, literature women. CONCLUSIONS: These findings emphasise the need to implement an effective iodine supplementation programme targeted at young and pregnant women in this area of western Africa. They also emphasise the importance of improving the nutritional status of young girls and the crucial role played by education in the prevention of reproductive failure.

Abortion, Spontaneous↗

[Prevention of iron deficiency and iron deficiency anemia in tropical areas].

Iron deficiency is the most widespread nutritional disease in the World. It is prevalent in tropical areas especially in pregnant women and children. The main cause in these areas is consumption of foods containing inhibitors of iron absorption resulting in insufficient bioavailability. In advanced stages of iron deficiency, low hemoglobin levels lead to anemia. Functional consequences of anemia depend on age including mental and physical retardation in children and work disability in adults. Although other disorders including parasitic, infectious, genetic, and nutritional diseases may be involved in anemia in tropical areas, iron deficiency is always a factor because of nutritional conditions. The WHO has proposed laboratory criteria for use in establishing the incidence of iron deficiency and related anemia in a given population. Based on several surveys, four preventive strategies have been developed, i.e., dietary diversification, iron supplementation, general public health measures, and food fortification. Each of these strategies has advantages and disadvantages. The prevailing consensus is that coordinated use of these approaches holds forth the only hope of impacting the incidence of iron-deficiency anemia in tropical regions.

Anemia, Iron-Deficiency↗

Left internal mammary artery graft perforation due to high-pressure stent deployment.

Perforation of newly placed left internal mammary artery (LIMA) grafts due to stent deployment is an infrequent but potentially dangerous complication of coronary interventions. It may lead to brisk hemorrhage and massive cardiac tamponade requiring emergent pericardiocentesis and surgery. We report a case of a LIMA graft perforation following stent deployment with a high-pressure balloon 12 days after surgery. The patient was treated with emergent pericardiocentesis, rapid autotransfusion of the pericardial aspirate into the systemic circulation, and surgical repair of the ruptured vessel.

Aged↗

Saphenous vein graft ectasia: an unusual late complication of coronary artery bypass surgery. A case report.

Aneurysms and ectasias of saphenous vein grafts are infrequent complications of coronary artery bypass surgery. They usually present as an expanding asymptomatic mediastinal mass on chest x-ray film or computed tomography scan. Though rare, they must be excluded from the differential diagnosis of mediastinal masses to avoid potentially dangerous needle biopsy. The authors describe ectasia of a saphenous vein graft in a 62-year-old man 14 years after coronary artery bypass surgery. The relevant literature is also discussed.

Aortic Aneurysm, Abdominal↗

Arteriography of the left internal mammary artery graft utilizing a balloon-tipped floatation catheter: an alternative approach.

In this report, we describe an alternative method to the conventional arteriographic techniques of the left internal mammary artery (LIMA) graft using a balloon-tipped floatation catheter placed within the left subclavian artery. The floatation catheter will serve as both an occluder of the subclavian artery as well as a port for contrast injection. It may be effectively employed in the rare instances where direct cannulation of the LIMA graft is not possible.

Cardiac Catheterization↗

Exercise echocardiography, angiography, and intracoronary ultrasound after cardiac transplantation.

Fifty-one consecutive patients underwent exercise echocardiography, angiography, and intracoronary ultrasound (ICUS) 2.5 years (range from 1 to 6) after cardiac transplantation. The average age of the donor was 29 years (range 13 to 50), and the average age of the recipient was 49 +/- 12 years. In total, 78 studies were performed, as 25 patients had >1 annual evaluation and 2 patients had 3 consecutive annual evaluations. Of the 78 angiographic studies, 40 (26 patients) had evidence of coronary artery disease, defined as a focal stenosis (>20%, n=4) or luminal irregularities (n=36). However, by ICUS all 51 patients had intimal thickening at some point, with 34 patients possessing diffuse disease and 17 focal intimal thickening only. Of the 25 serial studies, 12 progressed by at least 1 Stanford class. The sensitivity of angiography for determination of class III to IV intimal thickening was 64% and the specificity was 76%. On exercise echocardiography, 6 examinations revealed resting wall motions abnormalities, whereas 6 had inducible wall motion abnormalities with exercise. The sensitivity of exercise echocardiography to determine class III to IV intimal thickening was 15%, and the specificity was 85%. In conclusion, exercise echocardiography is an insensitive method for predicting transplant-mediated coronary artery disease, whereas luminal irregularities on angiography may predict the presence of Stanford grade III to IV intimal thickening.

Adult↗

An outbreak of pellagra related to changes in dietary niacin among Mozambican refugees in Malawi.

Between February and October 1990, 18,276 cases of pellagra dermatitis (due to niacin deficiency) were reported among 285,942 Mozambican refugees in Malawi. Overall, 6.3% of the refugee population developed pellagra and the attack rate was 7.8 times higher among women than men. This outbreak followed a 5-month cessation of groundnut distribution (the major source of niacin) to refugees. A matched-pair case-control study confirmed the protective role of the daily consumption of groundnuts (Odds Ratio [OR] = 0.08), as well as the independent role of garden ownership (OR = 0.34), and home maize milling (OR = 0.3). Recommended corrective action included early case finding and treatment, distribution of niacin tablets, prompt identification of groundnut supply on the world market, fortification with niacin of the food ration and diversification of the food basket through access to local markets.

Adolescent↗

Double balloon mitral valvuloplasty through dual femoral vein punctures and a single atrial septal puncture.

A modification of a previously described double balloon mitral valvuloplasty procedure is described. This involves dual femoral vein punctures with a single atrial septal puncture. After initial transseptal catheterization and predilatation of the interatrial septum with an 8-mm balloon, a second catheter is advanced through the resulting atrial septal defect allowing access to the left atrium and left ventricle through the mitral valve via two separate femoral vein puncture sites. In comparison with the previously described technique using two balloon catheters inserted through a single femoral vein puncture site, this modification has reduced the amount of bleeding from the femoral vein and the need for transfusion. Furthermore, the potential for subsequent interatrial shunting is less than with the alternative previously described technique utilizing two femoral vein punctures with two separate punctures in the interatrial septum. In utilizing two separate femoral vein punctures with only one atrial septal puncture this technique combines advantages of the two previously described techniques.

Catheterization↗

Characterization of dietary-induced hypercholesterolemia in the chicken.

The effect of 2% dietary cholesterol on the distribution of cholesterol among the plasma lipoproteins was studied in 2-week old male chickens. Very-low-, intermediate-, low- and high-density lipoproteins (VLDL, IDL, LDL and HDL) were separated from plasma by density gradient ultracentrifugation in order to determine their concentration and chemical composition. VLDL were furthermore characterized as concerned their size, mobility and protein content. The lipoprotein profile was quantitatively and qualitatively normal in the control group (n = 6) fed the diet without cholesterol, HDL representing the major lipoprotein class (5.06 +/- 0.36 g/l) and the main carrier of cholesterol. Birds fed the cholesterol containing diets for 5 weeks (n = 6) exhibited a dramatic hypercholesterolemia (1.60 +/- 0.89 g/l free cholesterol and 6.70 +/- 3.22 g/l cholesteryl esters) and a shift in their lipoprotein pattern, with an accumulation of beta-VLDL (6.08 +/- 4.21 g/l) and a marked decrease in HDL level (3.53 +/- 0.91 g/l). The decrease or absence of LDL was balanced by a considerable amount of beta-VLDL remnants (namely IDL), so that the concentration of IDL + LDL considered as a whole was not modified significantly (2.10 +/- 0.95 g/l compared to 1.66 +/- 1.13 g/l in controls). Chicken beta-VLDL, smaller in size (31.0 nm) than control VLDL (33.5 nm), were typically enriched in cholesterol (67%) but they lacked apoE. About 60% of plasma cholesterol was associated with beta-VLDL which therefore represented the main atherogenic lipoprotein class and were probably responsible for the greater amount of cholesterol found in the aorta in these chickens (2.44 +/- 0.99 mg/g aorta vs. 1.32 +/- 0.57 in controls). Since LDL were very reduced or absent, the cholesterol-fed chicken provides a suitable model in which to study the role of beta-VLDL in atherogenesis.

Animals↗

[The urinary metabolites of niacin during the course of pellagra].

The three main metabolites of niacin have been measured in urine of 10 Mozambican women living in refugee camps in Malawi and displaying clinical symptoms of pellagra. This study, in which a control group was included, showed that the ratio 6PYR/N1MN is well correlated to the occurrence of clinical symptoms of niacin deficiency and constitutes a reliable indicator of vitamin PP status in subjects at risk of this deficiency.

Adolescent↗

ACC/AHA guidelines for cardiac catheterization and cardiac catheterization laboratories. American College of Cardiology/American Heart Association Ad Hoc Task Force on Cardiac Catheterization.

It is evident that the practice of cardiac catheterization has undergone, and continues to undergo, marked change. Most prominent are the recent very rapid proliferation of catheterization laboratories in general and the development of newer types of catheterization laboratory. No uniform definitions exist for these newer laboratories, so meaningful communication is difficult. The new settings are of particular concern because their location, mobility, organization, and ownership raise questions about the quality of patient care. Most difficult to address are the questions about patient safety and physician conflict of interest. There are no objective data in peer-reviewed literature to support the reported safety and cost savings of these newer settings. Through deliberations, surveys, interviews, and correspondence with the cardiology community embraced by the ACC and the AHA, the task force generally found that in freestanding catheterization laboratories, access to emergency hospitalization may be delayed, and appropriate oversight may be lacking. Additionally, opportunities for self-referral may be fostered and the perception of commercialism and entrepreneurial excess in practice created. All of these problems must be avoided. The growth and development of some freestanding facilities, particularly the mobile laboratories, do not seem to have been driven by an increased need in remote communities or for temporary support but rather almost exclusively by a desire to capture market share. Accordingly, a series of definitions, guidelines, and recommendations for the laboratories as well as for patient selection has been developed. The consensus was that a very restrictive and cautious attitude to the newer settings is appropriate at this time. The justification for development or expansion of cardiac catheterization services must be patient need. Documentation of this need must be based on objective estimates of the number of patients with known or suspected cardiac disease who meet generally accepted indications for laboratory study. Concerns about the lack of data from prospective clinical trials of patient safety in such a group necessitate a very cautious attitude toward any new catheterization services, in particular those without in-house cardiac surgical support. In view of the lack of appropriately controlled safety and need data for hospital-based, mobile, or freestanding laboratories operating without on-site (accessible by gurney) cardiac surgery facilities, the task force reaffirms the position that further development of these services cannot be endorsed at this time. In addition, there is reason for major concern that such proliferation in catheterization services may contribute to increasing costs and troubling ethical questions.

American Heart Association↗

Comparison of contrast angiography and two-dimensional echocardiography for the evaluation of left ventricular regional wall motion abnormalities after acute myocardial infarction.

Regional left ventricular wall motion abnormalities were assessed using 2-dimensional echocardiography and contrast ventriculography within 12 hours of the onset of chest pain in 20 patients with acute myocardial infarction (AMI); 10 patients had anterior infarctions and 10 had inferior. End-diastolic and end-systolic sinus beats from right anterior oblique contrast ventriculograms were analyzed using the center-line chord technique with both a standard overlap method of chord assignment and a nonoverlap method. Echocardiograms were obtained in parasternal long- and short-axis and apical 2- and 4-chamber views and analyzed using a 16-segment scoring system to derive anterior and infero-posterolateral wall motion indexes using both overlap (10 segments for anterior, 8 inferior) as well as nonoverlap (9 segments anterior, 7 inferior) methods of segment assignment. There was a significant inverse correlation between the standard (nonoverlap) echocardiographic analysis and the standard (overlap) angiographic analysis for infarct regions (y = -0.43 X +1.11, r = -0.59, p less than 0.05). Fifteen of 18 patients with angiographic infarct regional score less than or equal to -1 standard deviation/chord had an echocardiographic index greater than or equal to 1.5, while 15 of 16 patients with echocardiographic regional infarct index greater than or equal to 1.5 had an angiographic score less than or equal to -1 standard deviation/chord. Correlation between the 2 methods for noninfarct territories was poor (r = -0.34) because the angiographic method assesses hyperkinesis while the echocardiographic method does not.(ABSTRACT TRUNCATED AT 250 WORDS)

Contrast Media↗