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Dynamics of infection as a determinant of progression of gastric precancerous lesions: 16-year follow-up of an eradication trial.
Mera RM, Bravo LE, Camargo MC, Bravo JC, Delgado AG, Romero-Gallo J, Yepez MC, Realpe JL, Schneider BG, Morgan DR, Peek RM, Correa P, Wilson KT, Piazuelo MB
(2018) Gut 67: 1239-1246
MeSH Terms: Adult, Aged, Anti-Bacterial Agents, Disease Progression, Drug Administration Schedule, Female, Follow-Up Studies, Helicobacter Infections, Helicobacter pylori, Humans, Male, Metaplasia, Middle Aged, Precancerous Conditions, Risk Factors, Stomach Neoplasms
Show Abstract · Added June 29, 2017
OBJECTIVE - To evaluate the long-term effect of cumulative time exposed to infection on the progression of gastric lesions.
DESIGN - 795 adults with precancerous gastric lesions were randomised to receive anti- treatment at baseline. Gastric biopsies were obtained at baseline and at 3, 6, 12 and 16 years. A total of 456 individuals attended the 16-year visit. Cumulative time of exposure was calculated as the number of years infected during follow-up. Multivariable logistic regression models were used to estimate the risk of progression to a more advanced diagnosis (versus no change/regression) as well as gastric cancer risk by intestinal metaplasia (IM) subtype. For a more detailed analysis of progression, we also used a histopathology score assessing both severity and extension of the gastric lesions (range 1-6). The score difference between baseline and 16 years was modelled by generalised linear models.
RESULTS - Individuals who were continuously infected with for 16 years had a higher probability of progression to a more advanced diagnosis than those who cleared the infection and remained negative after baseline (p=0.001). Incomplete-type IM was associated with higher risk of progression to cancer than complete-type (OR, 11.3; 95% CI 1.4 to 91.4). The average histopathology score increased by 0.20 units/year (95% CI 0.12 to 0.28) among individuals continuously infected with . The effect of cumulative time of infection on progression in the histopathology score was significantly higher for individuals with atrophy (without IM) than for individuals with IM (p<0.001).
CONCLUSIONS - Long-term exposure to infection was associated with progression of precancerous lesions. Individuals infected with with these lesions may benefit from eradication, particularly those with atrophic gastritis without IM. Incomplete-type IM may be a useful marker for the identification of individuals at higher risk for cancer.
© Article author(s) (or their employer(s) unless otherwise stated in the text of the article) 2018. All rights reserved. No commercial use is permitted unless otherwise expressly granted.
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16 MeSH Terms
Chronic Angiotensin-(1-7) Improves Insulin Sensitivity in High-Fat Fed Mice Independent of Blood Pressure.
Williams IM, Otero YF, Bracy DP, Wasserman DH, Biaggioni I, Arnold AC
(2016) Hypertension 67: 983-91
MeSH Terms: Analysis of Variance, Angiotensin I, Animals, Blood Glucose, Blood Pressure Determination, Body Composition, Cardiovascular Diseases, Diet, High-Fat, Disease Models, Animal, Dose-Response Relationship, Drug, Drug Administration Schedule, Glucose Clamp Technique, Heart Function Tests, Hemodynamics, Hypertension, Infusions, Subcutaneous, Insulin Resistance, Male, Mice, Mice, Inbred C57BL, Obesity, Peptide Fragments, Random Allocation, Reference Values, Renin-Angiotensin System
Show Abstract · Added May 5, 2016
Angiotensin-(1-7) improves glycemic control in animal models of cardiometabolic syndrome. The tissue-specific sites of action and blood pressure dependence of these metabolic effects, however, remain unclear. We hypothesized that Ang-(1-7) improves insulin sensitivity by enhancing peripheral glucose delivery. Adult male C57BL/6J mice were placed on standard chow or 60% high-fat diet for 11 weeks. Ang-(1-7) (400 ng/kg per minute) or saline was infused subcutaneously during the last 3 weeks of diet, and hyperinsulinemic-euglycemic clamps were performed at the end of treatment. High-fat fed mice exhibited modest hypertension (systolic blood pressure: 137 ± 3 high fat versus 123 ± 5 mm Hg chow;P=0.001), which was not altered by Ang-(1-7) (141 ± 4 mm Hg;P=0.574). Ang-(1-7) did not alter body weight or fasting glucose and insulin in chow or high-fat fed mice. Ang-(1-7) increased the steady-state glucose infusion rate needed to maintain euglycemia in high-fat fed mice (31 ± 5 Ang-(1-7) versus 16 ± 1 mg/kg per minute vehicle;P=0.017) reflecting increased whole-body insulin sensitivity, with no effect in chow-fed mice. The improved insulin sensitivity in high-fat fed mice was because of an enhanced rate of glucose disappearance (34 ± 5 Ang-(1-7) versus 20 ± 2 mg/kg per minute vehicle;P=0.049). Ang-(1-7) enhanced glucose uptake specifically into skeletal muscle by increasing translocation of glucose transporter 4 to the sarcolemma. Our data suggest that Ang-(1-7) has direct insulin-sensitizing effects on skeletal muscle, independent of changes in blood pressure. These findings provide new insight into mechanisms by which Ang-(1-7) improves insulin action, and provide further support for targeting this peptide in cardiometabolic disease.
© 2016 American Heart Association, Inc.
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25 MeSH Terms
Sertraline inhibits increases in body fat and carbohydrate dysregulation in adult female cynomolgus monkeys.
Silverstein-Metzler MG, Shively CA, Clarkson TB, Appt SE, Carr JJ, Kritchevsky SB, Jones SR, Register TC
(2016) Psychoneuroendocrinology 68: 29-38
MeSH Terms: Adipose Tissue, Animals, Antidepressive Agents, Body Composition, Body Weight, Carbohydrate Metabolism, Depression, Drug Administration Schedule, Female, Insulin, Longitudinal Studies, Macaca fascicularis, Models, Animal, Random Allocation, Serotonin Uptake Inhibitors, Sertraline
Show Abstract · Added September 29, 2016
Selective serotonin reuptake inhibitor (SSRI) antidepressants are widely prescribed for depression and other disorders. SSRIs have become one of the most commonly used drugs in the United States, particularly by women. Acute effects on body composition and carbohydrate metabolism have been reported, but little is known regarding the effects of chronic SSRI use. We evaluated the effects of chronic administration of a commonly prescribed SSRI, sertraline HCl, on body weight and composition, fat distribution, carbohydrate metabolism, as well as activity, in adult female depressed and nondepressed cynomolgus monkeys (Macaca fascicularis; n=42) using a placebo-controlled, longitudinal, randomized study design. Phenotypes were evaluated prior to and after 18 months of oral sertraline (20mg/kg) or placebo. Over the 18 month treatment period, the placebo group experienced increases in body weight, body fat (visceral and subcutaneous) fasting insulin concentrations, and homeostasis model assessment of insulin resistance scores (HOMA-IR). Sertraline treatment prevented increases in body weight, fat, insulin, and HOMA-IR (all p<0.05), without significantly altering activity levels. Sertraline treatment altered adiponectin in an unusual way - reducing circulating adiponectin in depressed monkeys without affecting fat mass or body weight. Deleterious effects on adiponectin, a potentially insulin-sensitizing and atheroprotective protein, may result in adverse effects on cardiovascular health despite otherwise beneficial effects on body composition and carbohydrate metabolism.
Copyright © 2016. Published by Elsevier Ltd.
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High-Dose Perioperative Atorvastatin and Acute Kidney Injury Following Cardiac Surgery: A Randomized Clinical Trial.
Billings FT, Hendricks PA, Schildcrout JS, Shi Y, Petracek MR, Byrne JG, Brown NJ
(2016) JAMA 315: 877-88
MeSH Terms: Acute Kidney Injury, Aged, Aged, 80 and over, Aspartate Aminotransferases, Atorvastatin, Cardiac Surgical Procedures, Creatinine, Double-Blind Method, Drug Administration Schedule, Female, Glomerular Filtration Rate, Humans, Hydroxymethylglutaryl-CoA Reductase Inhibitors, Male, Medication Adherence, Middle Aged, Postoperative Complications, Renal Insufficiency, Chronic
Show Abstract · Added April 6, 2017
IMPORTANCE - Statins affect several mechanisms underlying acute kidney injury (AKI).
OBJECTIVE - To test the hypothesis that short-term high-dose perioperative atorvastatin would reduce AKI following cardiac surgery.
DESIGN, SETTING, AND PARTICIPANTS - Double-blinded, placebo-controlled, randomized clinical trial of adult cardiac surgery patients conducted from November 2009 to October 2014 at Vanderbilt University Medical Center.
INTERVENTIONS - Patients naive to statin treatment (n = 199) were randomly assigned 80 mg of atorvastatin the day before surgery, 40 mg of atorvastatin the morning of surgery, and 40 mg of atorvastatin daily following surgery (n = 102) or matching placebo (n = 97). Patients already taking a statin prior to study enrollment (n = 416) continued taking the preenrollment statin until the day of surgery, were randomly assigned 80 mg of atorvastatin the morning of surgery and 40 mg of atorvastatin the morning after (n = 206) or matching placebo (n = 210), and resumed taking the previously prescribed statin on postoperative day 2.
MAIN OUTCOMES AND MEASURES - Acute kidney injury defined as an increase of 0.3 mg/dL in serum creatinine concentration within 48 hours of surgery (Acute Kidney Injury Network criteria).
RESULTS - The data and safety monitoring board recommended stopping the group naive to statin treatment due to increased AKI among these participants with chronic kidney disease (estimated glomerular filtration rate <60 mL/min/1.73 m2) receiving atorvastatin. The board later recommended stopping for futility after 615 participants (median age, 67 years; 188 [30.6%] were women; 202 [32.8%] had diabetes) completed the study. Among all participants (n = 615), AKI occurred in 64 of 308 (20.8%) in the atorvastatin group vs 60 of 307 (19.5%) in the placebo group (relative risk [RR], 1.06 [95% CI, 0.78 to 1.46]; P = .75). Among patients naive to statin treatment (n = 199), AKI occurred in 22 of 102 (21.6%) in the atorvastatin group vs 13 of 97 (13.4%) in the placebo group (RR, 1.61 [0.86 to 3.01]; P = .15) and serum creatinine concentration increased by a median of 0.11 mg/dL (10th-90th percentile, -0.11 to 0.56 mg/dL) in the atorvastatin group vs by a median of 0.05 mg/dL (10th-90th percentile, -0.12 to 0.33 mg/dL) in the placebo group (mean difference, 0.08 mg/dL [95% CI, 0.01 to 0.15 mg/dL]; P = .007). Among patients already taking a statin (n = 416), AKI occurred in 42 of 206 (20.4%) in the atorvastatin group vs 47 of 210 (22.4%) in the placebo group (RR, 0.91 [0.63 to 1.32]; P = .63).
CONCLUSIONS AND RELEVANCE - Among patients undergoing cardiac surgery, high-dose perioperative atorvastatin treatment compared with placebo did not reduce the risk of AKI overall, among patients naive to treatment with statins, or in patients already taking a statin. These results do not support the initiation of statin therapy to prevent AKI following cardiac surgery.
TRIAL REGISTRATION - clinicaltrials.gov Identifier: NCT00791648.
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Acute and chronic ethanol exposure differentially regulate CB1 receptor function at glutamatergic synapses in the rat basolateral amygdala.
Robinson SL, Alexander NJ, Bluett RJ, Patel S, McCool BA
(2016) Neuropharmacology 108: 474-84
MeSH Terms: Animals, Basolateral Nuclear Complex, Dose-Response Relationship, Drug, Drug Administration Schedule, Ethanol, Excitatory Postsynaptic Potentials, Glutamic Acid, Male, Organ Culture Techniques, Rats, Rats, Sprague-Dawley, Receptor, Cannabinoid, CB1, Synapses
Show Abstract · Added March 14, 2018
The endogenous cannabinoid (eCB) system has been suggested to play a key role in ethanol preference and intake, the acute effects of ethanol, and in the development of withdrawal symptoms following ethanol dependence. Ethanol-dependent alterations in glutamatergic signaling within the lateral/basolateral nucleus of the amygdala (BLA) are critical for the development and expression of withdrawal-induced anxiety. Notably, the eCB system significantly regulates both glutamatergic and GABAergic synaptic activity within the BLA. Chronic ethanol exposure significantly alters eCB system expression within regions critical to the expression of emotionality and anxiety-related behavior, including the BLA. Here, we investigated specific interactions between the BLA eCB system and its functional regulation of synaptic activity during acute and chronic ethanol exposure. In tissue from ethanol naïve-rats, a prolonged acute ethanol exposure caused a dose dependent inhibition of glutamatergic synaptic activity via a presynaptic mechanism that was occluded by CB1 antagonist/inverse agonists SR141716a and AM251. Importantly, this acute ethanol inhibition was attenuated following 10 day chronic intermittent ethanol vapor exposure (CIE). CIE exposure also significantly down-regulated CB1-mediated presynaptic inhibition at glutamatergic afferent terminals but spared CB1-inhibition of GABAergic synapses arising from local inhibitory-interneurons. CIE also significantly elevated BLA N-arachidonoylethanolamine (AEA or anandamide) levels and decreased CB1 receptor protein levels. Collectively, these data suggest a dynamic regulation of the BLA eCB system by acute and chronic ethanol.
Copyright © 2015 Elsevier Ltd. All rights reserved.
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13 MeSH Terms
Cardiac Outcomes of Patients Receiving Adjuvant Weekly Paclitaxel and Trastuzumab for Node-Negative, ERBB2-Positive Breast Cancer.
Dang C, Guo H, Najita J, Yardley D, Marcom K, Albain K, Rugo H, Miller K, Ellis M, Shapira I, Wolff AC, Carey LA, Moy B, Groarke J, Moslehi J, Krop I, Burstein HJ, Hudis C, Winer EP, Tolaney SM
(2016) JAMA Oncol 2: 29-36
MeSH Terms: Adult, Aged, Aged, 80 and over, Antineoplastic Combined Chemotherapy Protocols, Biomarkers, Tumor, Breast Neoplasms, Chemotherapy, Adjuvant, Disease-Free Survival, Drug Administration Schedule, Female, Humans, Middle Aged, Neoplasm Staging, Paclitaxel, Receptor, ErbB-2, Risk Assessment, Risk Factors, Stroke Volume, Time Factors, Trastuzumab, Treatment Outcome, United States, Ventricular Dysfunction, Left, Ventricular Function, Left, Young Adult
Show Abstract · Added March 6, 2016
IMPORTANCE - Trastuzumab is a life-saving therapy but is associated with symptomatic and asymptomatic left ventricular ejection fraction (LVEF) decline. We report the cardiac toxic effects of a nonanthracycline and trastuzumab-based treatment for patients with early-stage human epidermal growth factor receptor 2 (ERBB2, formerly HER2 or HER2/neu)-positive breast cancer.
OBJECTIVE - To determine the cardiac safety of paclitaxel with trastuzumab and the utility of LVEF monitoring in patients with node-negative, ERBB2-positive breast cancer.
DESIGN, SETTING, AND PARTICIPANTS - In this secondary analysis of an uncontrolled, single group study across 14 medical centers, enrollment of 406 patients with node-negative, ERBB2-positive breast cancer 3 cm, or smaller, and baseline LVEF of greater than or equal to 50% occurred from October 9, 2007, to September 3, 2010. Patients with a micrometastasis in a lymph node were later allowed with a study amendment. Median patient age was 55 years, 118 (29%) had hypertension, and 30 (7%) had diabetes. Patients received adjuvant paclitaxel for 12 weeks with trastuzumab, and trastuzumab was continued for 1 year. Median follow-up was 4 years.
INTERVENTIONS - Treatment consisted of weekly 80-mg/m2 doses of paclitaxel administered concurrently with trastuzumab intravenously for 12 weeks, followed by trastuzumab monotherapy for 39 weeks. During the monotherapy phase, trastuzumab could be administered weekly 2-mg/kg or every 3 weeks as 6-mg/kg. Radiation and hormone therapy were administered per standard guidelines after completion of the 12 weeks of chemotherapy. Patient LVEF was assessed at baseline, 12 weeks, 6 months, and 1 year.
MAIN OUTCOMES AND MEASURES - Cardiac safety data, including grade 3 to 4 left ventricular systolic dysfunction (LVSD) and significant asymptomatic LVEF decline, as defined by our study, were reported.
RESULTS - Overall, 2 patients (0.5%) (95% CI, 0.1%-1.8%) developed grade 3 LVSD and came off study, and 13 (3.2%) (95% CI, 1.9%-5.4%) had significant asymptomatic LVEF decline, 11 of whom completed study treatment. Median LVEF at baseline was 65%; 12 weeks, 64%; 6 months, 64%; and 1 year, 64%.
CONCLUSIONS AND RELEVANCE - Cardiac toxic effects from paclitaxel with trastuzumab, manifesting as grade 3 or 4 LVSD or asymptomatic LVEF decline, were low. Patient LVEF was assessed at baseline, 12 weeks, 6 months, and 1 year, and our findings suggest that LVEF monitoring during trastuzumab therapy without anthracyclines could be simplified for many individuals.
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Comparison of 60 and 80 mg/m of daunorubicin in induction therapy of acute myeloid leukaemia.
Vaezi M, Bahar B, Mousavi A, Yaghmai M, Kasaeian A, Souri M, Jahani M, Alimoghaddam K, Ghavamzadeh A
(2017) Hematol Oncol 35: 101-105
MeSH Terms: Adolescent, Adult, Antibiotics, Antineoplastic, Chromosome Aberrations, Cytarabine, Daunorubicin, Disease-Free Survival, Dose-Response Relationship, Drug, Drug Administration Schedule, Febrile Neutropenia, Female, Follow-Up Studies, Humans, Kaplan-Meier Estimate, Leukemia, Myeloid, Acute, Male, Middle Aged, Mycoses, Neutropenia, Prevalence, Prospective Studies, Remission Induction, Treatment Outcome, Young Adult
Show Abstract · Added September 28, 2015
For finding better method of acute myeloid leukaemia (AML) induction, we designed a prospective clinical trial to find a more effective regimen with least toxicity for induction therapy of AML. Hence, we examined different accepted doses of daunorubicin and their outcomes. Total of 114 patients were included in the study. Fifty-five patients received 60 mg/m of daunorubicin (arm 1) 1 h IV infusion for 3 days, and the remaining 59 received 80 mg/m (arm 2) 1 h IV infusion for 3 days. Continuous infusion of 100 mg/m /day of cytosine arabinozide IV for 24 h for 7 days was given in both groups. Complete remission rate was 77.78% in group 1 and 76.92% in group 2 (p = 0.92). One-year overall survival was 55.85% [standard error (SE) = 8.05%] in arm 1 and 57.94% (SE = 7.32%) in arm 2. Median follow-up time was 11.1 (SE = 1.43) and 10.28 (SE = 1.29) months, respectively. One-year disease-free survival was 64.41% (SE = 7.39%) in arm 1 and 54.86% (SE = 7.53%) in arm 2. Complete remission, overall survival and disease-free survival were statistically the same in both groups (p = 0.92, 0.697, 0.31). Toxicity and safety profile were similar in two groups but need to transfusion was higher in arm 2. Febrile neutropenia, days of antibiotics consumption and invasive fungal infection prevalence did not show any difference. Mean transfused packed cells and platelets rate were higher in the group that received higher dose of daunorubicin. Considering these results, we found that 60 mg/m of daunorubicin would be more rational and as effective with lower toxicity to 80 mg/m in induction therapy of AML patients at least as scheduled in our trial. Copyright © 2015 John Wiley & Sons, Ltd.
Copyright © 2015 John Wiley & Sons, Ltd.
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Three months of weekly rifapentine plus isoniazid is less hepatotoxic than nine months of daily isoniazid for LTBI.
Bliven-Sizemore EE, Sterling TR, Shang N, Benator D, Schwartzman K, Reves R, Drobeniuc J, Bock N, Villarino ME, TB Trials Consortium
(2015) Int J Tuberc Lung Dis 19: 1039-44, i-v
MeSH Terms: Adult, Antitubercular Agents, Aspartate Aminotransferases, Brazil, Canada, Case-Control Studies, Chemical and Drug Induced Liver Injury, Drug Administration Schedule, Drug Therapy, Combination, Female, Hepatitis C, Humans, Isoniazid, Latent Tuberculosis, Male, Middle Aged, Multivariate Analysis, Rifampin, Risk Factors, Spain, United States
Show Abstract · Added February 17, 2016
SETTING - Nine months of daily isoniazid (9H) and 3 months of once-weekly rifapentine plus isoniazid (3HP) are recommended treatments for latent tuberculous infection (LTBI). The risk profile for 3HP and the contribution of hepatitis C virus (HCV) infection to hepatotoxicity are unclear.
OBJECTIVES - To evaluate the hepatotoxicity risk associated with 3HP compared to 9H, and factors associated with hepatotoxicity.
DESIGN - Hepatotoxicity was defined as aspartate aminotransferase (AST) >3 times the upper limit of normal (ULN) with symptoms (nausea, vomiting, jaundice, or fatigue), or AST >5 x ULN. We analyzed risk factors among adults who took at least 1 dose of their assigned treatment. A nested case-control study assessed the role of HCV.
RESULTS - Of 6862 participants, 77 (1.1%) developed hepatotoxicity; 52 (0.8%) were symptomatic; 1.8% (61/3317) were on 9H and 0.4% (15/3545) were on 3HP (P < 0.0001). Risk factors for hepatotoxicity were age, female sex, white race, non-Hispanic ethnicity, decreased body mass index, elevated baseline AST, and 9H. In the case-control study, HCV infection was associated with hepatotoxicity when controlling for other factors.
CONCLUSION - The risk of hepatotoxicity during LTBI treatment with 3HP was lower than the risk with 9H. HCV and elevated baseline AST were risk factors for hepatotoxicity. For persons with these risk factors, 3HP may be preferred.
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Considerations and challenges in defining optimal iron utilization in hemodialysis.
Charytan DM, Pai AB, Chan CT, Coyne DW, Hung AM, Kovesdy CP, Fishbane S, Dialysis Advisory Group of the American Society of Nephrology
(2015) J Am Soc Nephrol 26: 1238-47
MeSH Terms: Anemia, Iron-Deficiency, Animals, Cross-Sectional Studies, Disease Models, Animal, Dose-Response Relationship, Drug, Drug Administration Schedule, Erythropoietin, Ferritins, Hematinics, Humans, Infusions, Intravenous, Iron Compounds, Kidney Failure, Chronic, Prognosis, Randomized Controlled Trials as Topic, Renal Dialysis, Risk Assessment, Treatment Outcome
Show Abstract · Added January 6, 2015
Trials raising concerns about erythropoiesis-stimulating agents, revisions to their labeling, and changes to practice guidelines and dialysis payment systems have provided strong stimuli to decrease erythropoiesis-stimulating agent use and increase intravenous iron administration in recent years. These factors have been associated with a rise in iron utilization, particularly among hemodialysis patients, and an unprecedented increase in serum ferritin concentrations. The mean serum ferritin concentration among United States dialysis patients in 2013 exceeded 800 ng/ml, with 18% of patients exceeding 1200 ng/ml. Although these changes are broad based, the wisdom of these practices is uncertain. Herein, we examine influences on and trends in intravenous iron utilization and assess the clinical trial, epidemiologic, and experimental evidence relevant to its safety and efficacy in the setting of maintenance dialysis. These data suggest a potential for harm from increasing use of parenteral iron in dialysis-dependent patients. In the absence of well powered, randomized clinical trials, available evidence will remain inadequate for making reliable conclusions about the effect of a ubiquitous therapy on mortality or other outcomes of importance to dialysis patients. Nephrology stakeholders have an urgent obligation to initiate well designed investigations of intravenous iron in order to ensure the safety of the dialysis population.
Copyright © 2015 by the American Society of Nephrology.
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Efficacy of paracetamol on patent ductus arteriosus closure may be dose dependent: evidence from human and murine studies.
El-Khuffash A, Jain A, Corcoran D, Shah PS, Hooper CW, Brown N, Poole SD, Shelton EL, Milne GL, Reese J, McNamara PJ
(2014) Pediatr Res 76: 238-44
MeSH Terms: Acetaminophen, Administration, Intravenous, Administration, Oral, Animals, Blood Pressure, Cyclooxygenase Inhibitors, Dose-Response Relationship, Drug, Drug Administration Schedule, Ductus Arteriosus, Ductus Arteriosus, Patent, Humans, Indomethacin, Infant, Newborn, Ligation, Prostaglandin Antagonists, Retrospective Studies, Time Factors, Treatment Outcome, Vasoconstriction, Vasoconstrictor Agents
Show Abstract · Added April 9, 2015
BACKGROUND - We evaluated the clinical effectiveness of variable courses of paracetamol on patent ductus arteriosus (PDA) closure and examined its effect on the in vitro term and preterm murine ductus arteriosus (DA).
METHODS - Neonates received one of the following three paracetamol regimens: short course of oral paracetamol (SCOP), long course of oral paracetamol (LCOP), and intravenous paracetamol (IVP) for 2-6 d. Pressure myography was used to examine changes in vasomotor tone of the preterm and term mouse DA in response to paracetamol or indomethacin. Their effect on prostaglandin synthesis by DA explants was measured by mass spectroscopy.
RESULTS - Twenty-one preterm infants were included. No changes in PDA hemodynamics were seen in SCOP infants (n = 5). The PDA became less significant and eventually closed in six LCOP infants (n = 7). PDA closure was achieved in eight IVP infants (n = 9). On pressure myograph, paracetamol induced a concentration-dependent constriction of the term mouse DA, up to 30% of baseline (P < 0.01), but required >1 µmol/l. Indomethacin induced greater DA constriction and suppression of prostaglandin synthesis (P < 0.05).
CONCLUSION - The clinical efficacy of paracetamol on PDA closure may depend on the duration of treatment and the mode of administration. Paracetamol is less potent than indomethacin for constriction of the mouse DA in vitro.
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