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At least 577 records · Page 32Linked to original sources

Experience with a new percutaneous port system, Percuseal, for intravenous injection in patients with haemophilia, von Willebrand disease and severe alpha1-antitrypsin deficiency.

We have implanted a new port system (Percuseal) in altogether 13 patients with haemophilia A, B, von Willebrand disease and alpha1-antitrypsin deficiency in order to facilitate venous access. The Percuseal system differs from subcutaneous ports, such as Port-a-Cath, in that the upper part of the device protrudes above the skin. In this way, the patient can easily puncture the port membrane under the guidance of his eyes without penetrating the skin. In the present study cohort, a number of complications occurred. These were mainly caused by repeated local infections (in five patients), which made it necessary to replace the ports in three of the patients and to permanently remove the ports as the first option in two of the patients. In one patient, the port was removed because of inconvenience when doing physical exercise. In one additional patient, a severe systemic infection occurred, causing spondylitis. Despite the high infection rate, most patients considered the device very convenient to use. Because of the side-effects seen in our study, the Percuseal port in its present form is not to be recommended for regular use. A reconstruction of the port, making it smaller and giving it an antibacteriostatic cap, may possibly make this kind of port system a feasible alternative to use in order to improve pharmacoeconomics in the prophylactic treatment of haemophilia and patients with alpha1-antitrypsin deficiency.

Adult↗

Pharmacokinetics of moxidectin and ivermectin following intravenous injection in pigs with different body compositions.

Macrocyclic lactones (ML) are highly effective anthelmintics that provide a long protective period after administration because of their extensive distribution into fat. This study examined whether the body composition of the animal at the time of treatment had any influence on the pharmacokinetics of two MLs, moxidectin (MOX) and ivermectin (IVM). 'Fat' and 'lean' lines of pigs were established using two different diets, with weekly determination of liveweight and backfat thickness confirming the difference in body condition between the groups. Blood samples were taken at regular intervals following i.v. injection of IVM or MOX at a dose of 300 microg/kg and the plasma was analysed using fluorescence high performance liquid chromatography (HPLC) to determine the concentration of IVM or MOX in the samples. Regardless of body composition IVM and MOX kinetics were very different with MOX having a greater apparent volume of distribution, longer distribution and elimination half-lives and a slower clearance rate than IVM, which led to MOX being detectable in plasma for >40 days compared with only 8-10 days for IVM. Altering body composition had no detectable influence on the kinetic disposition of IVM in this study. In contrast, although there was no difference in AUC or the volume of distribution, MOX was distributed within and eliminated from the lean animals more rapidly than from the fat animals.

Animals↗

[Attempted suicide by intravenous injection of metasystox].

A 27-year old man was admitted to the hospital after having attempted suicide by injection of 30 ml of metasystox (demeton-s-methyl), an organophosphate compound, in a cubital vein of the left arm. He was suffering from the typical cholinergic symptoms. Local examination of the injection site revealed a local inflammation extending from the middle of the left upper arm to the distal forearm. Surgical débridement became necessary. In the third week of treatment he developed a rhabdomyolysis (CK 66.300 U/l) with an acute renal failure and needed haemodialysis. Later he showed signs of an intermediate syndrome.

Acute Kidney Injury↗

[Cardiac adverse effects following an intravenous injection of pirenzepine are an expression of deficient receptor sensitivity].

Under the aspect of life-threatening pneumonias in long-term ventilated patients receiving ant-acids or H2-antagonists the prophylaxis of stress ulcer with pirenzepine gains new importance. This study was aimed at detecting cardiac side effects of pirenzepine due to low receptor specificity. Pirenzepine (10 mg) was given via the peripheral or central venous route at an injection velocity of 5 or 30 seconds as well as a control of 2 ml normal saline solution via the central venous route for 5 seconds, 20 times each. Heart rate and blood pressure were determined before and after the injection. Independent of the injection site or velocity, an increase in the heart rate was found after the injection of pirenzepine. The increase was more marked if the central venous route was used. The percentage rise in heart rate was up to the thirteenth minute highly significant when comparing pirenzepine to normal saline solution. There were no changes in blood pressure. If M1-cholinoceptors are blocked, a reduction of the heart rate is seen. Blocking M2-cholinoceptors causes a rise in the heart rate. Injecting 10 mg of the M1-antagonist pirenzepine results in a significant increase in the heart rate, independent of site or velocity of injection which can be explained by blocking M2-cholinoceptors at the same time. To prevent this probably dose-dependent effect, pirenzepine should be given slowly over a couple of minutes.

Adult↗

[Imaging of blood flow-dependent curve parameters in the course of sequential computed tomography of the kidneys following intravenous injection of a contrast bolus].

Since the introduction of fast CT scanners with short scanning times the early density changes observed during the first transit of a contrast bolus can be clearly demonstrated and quantified. A theoretical curve can be fit to the CT data describing the density changes in the kidney according to the indicator dilution principle. A curve parameter can be obtained which characterizes the shape of the curve. Then an image can be calculated which reflects the selected curve parameter rather than tissue densities. Such images have been termed "functional images". Using this type of imaging we were able to demonstrate acute changes in renal perfusion.

Animals↗

[Adverse reactions following high-dose intravenous injection of urographic contrast media].

The frequency and type of side effects from high-dose renographic contrast media correspond with those quoted in the literature for injections of small doses of contrast. In addition to the usual contra-indications against injection of renographic contrast, one should also consider the effect of short-lived increase in circulating volume in patients with left heart insufficiency.

Adolescent↗

[Bolus geometry and dynamics after intravenous injections of contrast media Studies using chronography].

Studies of contrast bolus geometry and dynamics were carried out by means of a chronogram - a digital serial radiographic method. Four situations were considered - contrast volume, speed of injections, subsequent saline injections and rapidly repeated contrast boli. Peak values, maximum duration and half-life of the bolus and maximum contrast enhancement were recorded. The results have shown that a larger volume of contrast with reduced injection speed leads to a lengthening of the peak period. More rapid injection speed up to 8 ml/sec leads to a higher peak and increased contrast enhancement. Further increases of injection speed beyond 8 ml/sec does not further increase contrast enhancement. The subsequent injection of saline has no recognisable effect on bolus geometry or dynamics.

Adult↗

Eradication of spontaneous metastases and activation of alveolar macrophages by intravenous injection of liposomes containing muramyl dipeptide.

The multiple systemic administration of multilamellar liposomes composed of phosphatidylserine and phosphatidylcholine (molar ratio 3:7) that contained water-soluble muramyl dipeptide (MDP) activated alveolar macrophages to become tumoricidal and eradicated established spontaneous pulmonary and lymph node metastases. Spontaneously metastasizing melanoma cells were injected into the footpads of mice. After 4-5 weeks, the tumors were resected by a midfemoral amputation; 3 days later, twice-weekly injections of liposomes were initiated and continued for 4 weeks. In some experiments the mice were killed 2 weeks after the final treatment. Seventy-four percent of animals injected with liposomes containing MDP were free of visible metastases. In a separate life-span experiment, 60% of mice treated with liposome-encapsulated MDP were tumor-free 120 days after the last liposome treatment or 110 days after all control mice treated with free MDP or control liposome preparations had died of disseminated cancer. These data suggest that the systemic administration of liposomes containing MDP, or similar compounds that produce macrophage activation, may provide an additional useful approach to the therapeutic regimens currently used to eradicate cancer metastases.

Acetylmuramyl-Alanyl-Isoglutamine↗