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Mia Sivén, Satu Kovanen, Outi Siirola, Tuomas Hepojoki, Sari Isokirmo, Niina Laihanen, Tiina Eränen, Jukka Pellinen, Anne M Juppo
OBJECTIVES: The study evaluated the quality of compounded sachets and hard gelatine capsules and their feasibility in paediatric drug administration. METHODS: Commercial tablets were compounded to sachets and capsules in hospital environment, and the uniformity of content and simulated drug dose were determined. KEY FINDINGS: Compounded formulations were successfully obtained for a range of drug substances; dipyridamole, spironolactone, warfarin and sotalol formulations were within acceptable limits for uniformity of content, in most cases...
October 5, 2016: Journal of Pharmacy and Pharmacology
Bradley Witbrodt, Abhinav Goyal, Anita A Kelkar, Sharmila Dorbala, Benjamin J W Chow, Marcelo F Di Carli, Brent A Williams, Michael E Merhige, Daniel S Berman, Guido Germano, Robert S Beanlands, James K Min, Punitha Arasaratnam, Masoud Sadreddini, Marjolein Lidwine van Velthuijsen, Leslee J Shaw
BACKGROUND: A drop in blood pressure (BP) or blunted BP response is an established high-risk marker during exercise myocardial perfusion imaging (MPI); however, data are sparse regarding the prognostic value of BP response in patients undergoing vasodilator stress rubidium-82 (Rb-82) Positron Emission Tomography (PET) MPI. METHODS AND RESULTS: From the PET Prognosis Multicenter Registry, a cohort of 3413 patients underwent vasodilator stress Rb-82 PET MPI with dipyridamole or adenosine...
September 22, 2016: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
Amirreza Khorasanchi, Mohsen Arabi, Alireza Akhavein, Mohammad Seyedabadi, Mansooreh Eftekhari, Hamid Javadi, Iraj Nabipour, Majid Assadi
INTRODUCTION: Dipyridamole inhibits adenosine reuptake and increases cyclic Adenosine Monophosphate (cAMP) levels in platelets, erythrocytes and endothelial cells, all of which influence blood glucose. Acute hyperglycaemia reduces endothelium-dependent vasodilation and suppresses coronary microcirculation; which, in theory, can alter the outcome of a radionuclide scan. AIM: The present study was conducted with the aim to investigate the changes in blood glucose level of patients receiving dipyridamole for cardiac scan...
August 2016: Journal of Clinical and Diagnostic Research: JCDR
Maseeh Uz Zaman, Nosheen Fatima, Areeba Zaman, Unaiza Zaman, Rabia Tahseen
For vasodilator stress, myocardial perfusion imaging (MPI) with at least 12-h caffeine abstinence is recommended, as it attenuates cardiovascular hyperemic response of adenosine and dipyridamole. However, many published conflicting results have shown no significant effect upon perfusion abnormalities in MPI performed without caffeine abstinence. The aim of this study was to compare the hemodynamic changes and negative predictive value (NPV) of normal MPIs with adenosine stress performed with or without caffeine abstinence...
September 2016: World Journal of Nuclear Medicine
Clara Carpeggiani, Patrizia Landi, Claudio Michelassi, Rosa Sicari, Eugenio Picano
BACKGROUND: Previous studies have suggested a decline in positivity of stress cardiac imaging, suggesting the need for developing better strategies for test selection to achieve acceptable cost-effectiveness balance. The aim of this retrospective study was to assess the rate of positivity of stress echocardiography (SE) over 27 consecutive years. METHODS: We assessed the rate of SE positivity in 2007 patients without previous myocardial infarction or coronary revascularization who performed SE in a tertiary care referral center from 1983 to 2009...
August 22, 2016: International Journal of Cardiology
Martin Lyngby Lassen, Thomas Rasmussen, Thomas E Christensen, Andreas Kjær, Philip Hasbak
BACKGROUND: Respiratory motion due to breathing during cardiac positron emission tomography (PET) results in spatial blurring and erroneous tracer quantification. Respiratory gating might represent a solution by dividing the PET coincidence dataset into smaller respiratory phase subsets. The aim of our study was to compare the resulting imaging quality by the use of a time-based respiratory gating system in two groups administered either adenosine or dipyridamole as the pharmacological stress agent...
September 7, 2016: Journal of Nuclear Cardiology: Official Publication of the American Society of Nuclear Cardiology
Bita Dadpour, Vahid R Dabbagh Kakhki, Reza Afshari, Masoumeh Dorri-Giv, Seyed A R Mohajeri, Somayeh Ghahremani
OBJECTIVES: Methamphetamine (MA) is associated with alterations of cardiac structure and function, although it is less known. In this study, we assessed possible abnormality in myocardial perfusion and left ventricular function using gated myocardial perfusion SPECT. METHODS: Fifteen patients with MA abuse, on the basis of Diagnostic and Statistical Manual of Mental Disorders, 4th ed. (DSM-IV) MA dependency determined by Structured Clinical Interview for DSM-IV, underwent 2-day dipyridamole stress/rest Tc-sestamibi gated myocardial perfusion SPECT...
August 17, 2016: Nuclear Medicine Communications
Helga Castagnoli, Cecilia Ferrantini, Raffaele Coppini, Alessandro Passeri, Katia Baldini, Valentina Berti, Franco Cecchi, Iacopo Olivotto, Roberto Sciagrà
AIMS: Myocardial blood flow <1.1 mL/min/g following dipyridamole (Dip-MBF) assessed by positron emission tomography (PET) was identified in 2003 as an important outcome predictor in hypertrophic cardiomyopathy (HCM), based on scans performed in the 90s. However, such extreme Dip-MBF impairment is rarely observed in contemporary cohorts. We, therefore, reassessed the Dip-MBF threshold defining high-risk HCM patients. METHODS: Dip-MBF was measured using (13)N-ammonia in 100 HCM consecutive patients, prospectively enrolled and followed for 4...
August 16, 2016: European Journal of Nuclear Medicine and Molecular Imaging
Aránzazu Mediero, Tuere Wilder, Vishnu S R Reddy, Qian Cheng, Nick Tovar, Paulo G Coelho, Lukasz Witek, Carl Whatling, Bruce N Cronstein
As many as 10% of bone fractures heal poorly, and large bone defects resulting from trauma, tumor, or infection may not heal without surgical intervention. Activation of adenosine A2A receptors (A2AR) stimulates bone formation. Ticagrelor and dipyridamole inhibit platelet function by inhibiting P2Y12 receptors and platelet phosphodiesterase, respectively, but share the capacity to inhibit cellular uptake of adenosine and thereby increase extracellular adenosine levels. Because dipyridamole promotes bone regeneration by an A2AR-mediated mechanism we determined whether ticagrelor could regulate the cells involved in bone homeostasis and regeneration in a murine model and whether inhibition of P2Y12 or indirect A2AR activation via adenosine was involved...
August 10, 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
Tochukwu C Okwuosa, Dominika Stefaniak, Basel Arafat, Abdullah Isreb, Ka-Wai Wan, Mohamed A Alhnan
PURPOSE: The fabrication of ready-to-use immediate release tablets via 3D printing provides a powerful tool to on-demand individualization of dosage form. This work aims to adapt a widely used pharmaceutical grade polymer, polyvinylpyrrolidone (PVP), for instant on-demand production of immediate release tablets via FDM 3D printing. METHODS: Dipyridamole or theophylline loaded filaments were produced via processing a physical mixture of API (10%) and PVP in the presence of plasticizer through hot-melt extrusion (HME)...
November 2016: Pharmaceutical Research
Tonino Bombardini, Louis A Mulieri, Stefano Salvadori, Marco Fabio Costantino, Maria Chiara Scali, Mario Marzilli, Eugenio Picano
INTRODUCTION AND OBJECTIVES: The variation between rest and peak stress end-systolic pressure-volume relation is an afterload-independent index of left ventricular contractility. Whether and to what extent it depends on end-diastolic volume remains unclear. The aim of this study was to assess the dependence of the delta rest-stress end-systolic pressure-volume relation on end-diastolic volume in patients with negative stress echo and all ranges of resting left ventricular function. METHODS: We analyzed interpretable data obtained in 891 patients (593 men, age 63 ± 12 years) with ejection fraction 47% ± 12%: 338 were normal or near-normal or hypertensive; 229 patients had coronary artery disease; and 324 patients had ischemic or nonischemic dilated cardiomyopathy...
July 27, 2016: Revista Española de Cardiología
Nikhil Kapil, Yvonne H Datta, Naila Alakbarova, Eric Bershad, Magdy Selim, David S Liebeskind, Ornina Bachour, Gundu H R Rao, Afshin A Divani
Ischemic stroke represents one of the leading causes of death and disability in both the United States and abroad, particularly for patients with prior ischemic stroke or transient ischemic attack (TIA). A quintessential aspect of secondary stroke prevention is the use of different pharmacological agents, mainly antiplatelets and anticoagulants. Antiplatelets and anticoagulants exhibit their effect by blocking the activation pathways of platelets and the coagulation cascade, respectively. Clinical trials have demonstrated the safety and efficacy of antiplatelets for noncardioembolic stroke prevention, while anticoagulants are more often used for cardioembolic stroke prevention...
July 26, 2016: Clinical and Applied Thrombosis/hemostasis
Nicola Gaibazzi, Valentina Lorenzoni, Claudio Reverberi, Juefei Wu, Feng Xie, Thomas R Porter
BACKGROUND: Real-time contrast stress echocardiography (RTCSE) permits the simultaneous analysis of myocardial perfusion and wall motion during stress echocardiography, which has resulted in improved coronary artery disease detection. Although several studies have confirmed a protective effect of obesity in coronary artery disease, it is unclear whether this benefit is dependent on the functional significance of the disease. The objective of this study was to compare outcomes in obese versus nonobese subjects referred for pharmacologic RTCSE...
September 2016: Journal of the American Society of Echocardiography
Vijaya L Damaraju, Dwayne Weber, Michelle Kuzma, Carol E Cass, Michael B Sawyer
Human nucleoside transporters (hNTs) mediate cellular influx of anticancer nucleoside drugs, including cytarabine, cladribine, and fludarabine. BCR-ABL tyrosine kinase inhibitors (TKIs) imatinib and dasatinib inhibit fludarabine and cytarabine uptake. We assessed interactions of bosutinib, dasatinib, imatinib, nilotinib, and ponatinib with recombinant hNTs (hENT1, 2; hCNT1, -2, and -3) produced individually in yeast Saccharomyces cerevisiae Nilotinib inhibited hENT1-mediated uridine transport most potently (IC50 value, 0...
September 2, 2016: Journal of Biological Chemistry
Attila Nemes, Gyula Szántó, Anita Kalapos, Péter Domsik, Tamás Forster
The left ventricular (LV) twist is defined as the wringing motion of the heart around its long-axis in systole caused by oppositely directed counterclockwise apical and clockwise basal rotations resulted from the movement of two orthogonally oriented muscular bands. In some clinical circumstances, rotation at both basal and apical levels of the LV occurred in the same clockwise or counterclockwise direction during systole resulting the near absence of LV twist as called left ventricular "rigid body rotation" (LV-RBR)...
June 2016: Quantitative Imaging in Medicine and Surgery
Yu-Hsiang Su, Sheng-Feng Sung
PURPOSE: Spontaneous hemorrhagic transformation is common in anterior circulation infarction, but is rarely seen in brainstem infarction. We report a case of massive symptomatic brainstem hemorrhagic transformation in a patient with pontine infarction treated with only antiplatelet agents. CASE REPORT: A 59-year-old man presented with acute dysarthria and right sided weakness. His Glasgow coma scale was E3 V5 M6. His pupils were pinpoint in size and minimally reactive to light...
March 2016: Acta Neurologica Taiwanica
Seyed Rasoul Zakavi, Mehdi Taherpour, Zohreh Moossavi, Ramin Sadeghi, Vahidreza Dabbagh Kakhki, Haleh Rokni
OBJECTIVE: Although coronary artery disease (CAD) is the leading cause of death in type 2 diabetic patients, it is frequently asymptomatic. Myocardial perfusion imaging (MPI) is reported to show ischemia in a significant number of asymptomatic diabetic patients. We studied the prevalence and severity of myocardial perfusion defects in asymptomatic diabetic patients and its clinical impact. METHODS AND PATIENTS: One hundred thirty consecutive asymptomatic patients, aged 35-65 years with type 2 diabetes mellitus and with no history of CAD and no cardiac symptoms were recruited in the study...
2013: Asia Ocean J Nucl Med Biol
F J Giles, T J Kanemaki, J T Otsuki, S I Hamburg, J T Yamashita, H A Koh, M M Fuerst, D A Kusuanco, M M Franco, S W Lim
Skin necrosis is a rare complication of heparin therapy. Strong evidence suggests an immune-mediated mechanism in which heparin-antibody complexes bind to platelets, resulting in platelet aggregation, thromboembolism, and ischemic necrosis. Heparin-induced thrombocytopenia (HIT) may also occur in response to immune-mediated platelet aggregation. The presence, of heparin-dependent antibodies can be confirmed by platelet aggregometry, (14)C-serotonin release assay (SRA), or enzyme-linked immunosorbent assay (ELISA)...
1997: Hematology (Amsterdam, Netherlands)
Nariman A El-Ragehy, Nagiba Y Hassan, Mahmoud A Tantawy, Mohamed Abdelkawy
Aspirin (ASP) and dipyridamole (DIP) are widely used as a combination in pharmaceutical formulations for treatment of strokes. Many of these formulations are containing tartaric acid as an excipient (in DIP pellets formulation for sustained release), which increases the probability of formation of dipyridamole tartaric acid ester impurity (DIP-I). On the other hand, salicylic acid (SAL) is considered to be one of the synthesis impurities and a degradation product of ASP. In this work, two chromatographic methods, namely, TLC-densitometry and HPLC, have been established and validated for simultaneous determination of ASP, DIP, SAL and DIP-I...
August 2016: Journal of Chromatographic Science
Shrawan Baghel, Helen Cathcart, Niall J O'Reilly
Amorphous solid dispersions (ASDs) have the potential to offer higher apparent solubility and bioavailability of BCS class II drugs. Knowledge of the solid state drug-polymer solubility/miscibility and their mutual interaction are fundamental requirements for the effective design and development of such systems. To this end, we have carried out a comprehensive investigation of various ASD systems of dipyridamole and cinnarizine in polyvinylpyrrolidone (PVP) and polyacrylic acid (PAA) at different drug loadings...
October 2016: European Journal of Pharmaceutics and Biopharmaceutics
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