1
|
Abstract
Restenosis after percutaneous transluminal coronary angioplasty was demonstrated in 61 (29%) of 210 successfully treated patients. Mostly it occurred within 4 months after treatment and in arteries less than 3 mm in diameter. Careful clinical follow-up is therefore particularly important early after angioplasty of smaller arteries. Redilation can be performed without increased risk of restenosis.
Collapse
|
2
|
Abstract
Purpose: To examine the cardiovascular effects of MnDPDP in a model of acute heart failure in the dog, and to compare these effects with those of MnCl2. Material and Methods: The study involved slow i.v. infusion of either 10,60 and 300 μmol/kg of MnDPDP, or 1, 6 and 30 μmol/kg MnCl2, in increasing doses to groups of 5 dogs. Acute ischaemic heart failure was first induced by injection of polystyrene microspheres (50 ± 10 μm) into the left coronary artery until a stable left ventricular end-diastolic pressure of approximately 20 mm Hg was achieved. The following test parameters were measured: left ventricular end-diastolic pressure; the first derivatives of maximum rate of left ventricular contraction and relaxation; mean aortic pressure; pulmonary artery pressure; right atrial pressure; cardiac ouput; heart rate; QT-time; PQ-time; QRS-width; and plasma catecholamines. Results: Slow infusion of MnDPDP at doses up to and including 12 times the clinical dose was well tolerated in dogs without further depression of cardiovascular function during acute ischaemic heart failure. At 300 μmol/kg, i.e. 60 times the human dose, only minor haemodynamic and electrophysiological effects were seen, and these were similar to those seen after administration of 30 μmol/kg MnCl2. Conclusion: The present study suggests that slow infusion of MnDPDP should not cause further deteroriation of cardiac function in patients with heart failure.
Collapse
Affiliation(s)
- J O Karlsson
- Department of Physiology and Biomedical Engineering, University of Trondheim, Norway.
| | | | | | | | | |
Collapse
|
3
|
Jacobsen EA, Pedersen HK, Kløw NE, Refsum H. Cardiac Effects of Adding Electrolytes and Oxygen to Iohexol in a Dog Model of Contrast Media-Induced Ventricular Fibrillation. Acta Radiol 2016. [DOI: 10.1177/028418519503600108] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
We investigated whether addition of a balanced electrolyte supplement and oxygen to the nonionic contrast medium iohexol reduces the risk of ventricular fibrillation (VF), and studied regional electrophysiology prior to the VF event. Twenty ml of each test solution were infused at a rate of 0.5 ml/s into the left anterior descending coronary artery (LAD) in 8 anesthetized dogs. LAD was externally occluded during infusion, to simulate a wedged catheter situation. ECG, hemodynamics, regional epicardial monophasic action potential duration (MAPD) and ventricular activation times (VAT) were calculated. All infusions with iohexol caused VF within 27 s. Five of 12 infusions with iohexol + 30 mmol NaCl, 3 of 11 infusions with iohexol + electrolytes (IPE) (NaCl, KCl, CaCl2 and MgCl2) and 4 of 11 infusions with IPE with oxygen addition (IPE + O2) caused VF after 45 s. Iohexol did not change MAPD prior to the VF event. Iohexol + 30 mmol NaCl and the IPE solutions lengthened MAPD initially, but at the time of the VF event MAPD were normalized or shortened. We conclude that electrolyte supplement to iohexol may prevent VF, probably by lengthening MAPD.
Collapse
|
4
|
Abstract
In a six-year period (1982–1987), 248 patients were treated with 297 procedures (percutaneous transluminal coronary angioplasty, PTCA) on 282 vessels. Two hundred and fifty-nine (87.2%) of the procedures in 210 (76.7%) of the patients appeared successful angiographically. Thirty-eight procedures were unsuccessful due to failure to pass the stenosis in 18 patients, dissection or occlusion of the treated vessel in 11, and significant residual stenosis in 9 patients. Emergency operations were performed after 11 (3.7%) of the procedures. Two patients died postoperatively. Myocardial infarction was seen in 13 patients, of whom 4 developed pathologic Q-waves in their ECG. Restenosis occurred in 60 (28.6%) of the patients. In the last year of the study, the patients selected for PTCA were in a poorer state angiographically, but the results of PTCA were better, without any increase of the complication rate. Our results, which are in accordance with others, support the concept that PTCA is a relatively safe procedure with a primary success rate of almost 90 per cent. However, approximately one third of the patients developed restenosis, which in most cases occurred within 3 months.
Collapse
|
5
|
Abstract
Electrolyte addition to nonionic contrast media has been suggested to further reduce the incidence of ventricular fibrillation during coronary arteriography. The present study was designed to investigate the effects of adding 30 mM NaCl, 0.9 mM KCl, 0.15 mM CaCl2 and 0.1 mM MgCl2 to iohexol on cardiac electrophysiology and hemodynamics (iohexol + electrolytes = IPE). Contrast media were injected into the left main coronary artery in 9 open-chest, anesthetized dogs before and after induction of acute ischemic heart failure. IPE increased left ventricular inotropy (LV dP/dtmax) with no initial decrease, even during heart failure. During heart failure IPE induced the same hemodynamic effects as iohexol without electrolyte addition. IPE slightly lengthened epicardial monophasic action potential duration before heart failure. We conclude that IPE appears to be well tolerated hemodynamically. The electrophysiologic differences between IPE and iohexol are small when the injection time is not longer than 5 s.
Collapse
|
6
|
Abstract
Hemispheric processing differences were assessed by presenting square matrices that varied in size and the number of filled-in cells. Subjects judged whether the matrix contained an even or odd number of filled cells. Experiment 1 employed relatively small matrix sizes (2 x 2, 3 x 3, and 4 x 4), and Experiment 2 employed relatively large matrix sizes (4 x 4, 6 x 6, and 8 x 8). Response time was shorter and error rates lower for left visual field/right hemisphere (LVF/RH) presentations compared to right visual field/left hemisphere (RVF/LH) presentations, with the larger matrices demonstrating the strongest visual field/hemispheric effects. Increases in the number of filled cells contributed to increases for the LVF/RH response time advantage only for the larger arrays. Analysis of the data from both studies collapsed across the number of filled cells produced highly consistent LVF/RH advantages for both response time and error rate, with stronger LVF/RH advantages found for the larger matrix sizes of both studies. The findings suggest that visual stimulus spatial frequency is a key determinant of hemispheric processing advantages, but that this factor is constrained by stimulus size variation. Theoretical implications with respect to the hemispheric processing double filtering by frequency model are discussed.
Collapse
|
7
|
Hald JK, Eldevik OP, Dunn RL, Bakke SJ, Pedersen HK, Nakstad PH. Improving postoperative MR imaging of pituitary macroadenomas: comparison of full and reduced dose of gadopentetate dimeglumine. Eur Radiol 2001; 10:1068-72. [PMID: 11003399 DOI: 10.1007/s003300000455] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The aim of this study was to evaluate the efficacy of contrast-medium (CM)-ehanced MR imaging of operated pituitary macroadenomas with reduced dose of gadopentetate dimeglumine. In a prospective study 18 patients were examined with coronal T1-weighted MR imaging prior to and following intravenous CM injections. Two sets of contrast-enhanced coronal images were obtained in each patient; the first set after 50% of the recommended dose of 0.1 mmol/kg body weight (b.w.) had been administered, and the second set immediately after additional CM had been given to make up a total dose of 0.1 mmol/kg b.w. The images were evaluated by three neuroradiologists. The SIPAP classification system was used to evaluate tumour extension, whereas tumour margin conspicuity was scored using an arbitrary scale of 1-5 (1 = indistinct, 5 = well defined). Signal intensity measurements obtained from the most enhancing part of the adenomas demonstrated increased enhancement with increased CM dose. Tumour delineation scores were significantly better on the reduced- and full-dose images than on pre-CM injection images, but, with one exception, tumour extension was identified as the same on all imaging sequences. Postoperative MR imaging of large macroadenoma residues can routinely be performed without intravenous CM. When CM is indicated a reduced dose of gadopentetate dimeglumine should provide sufficient diagnostic information.
Collapse
Affiliation(s)
- J K Hald
- Department of Radiology, Rikshospitalet, The National Hospital, Oslo, Norway
| | | | | | | | | | | |
Collapse
|
8
|
Pedersen HK, Bakke SJ, Hald JK, Skalpe IO, Anke IM, Sagsveen R, Langmoen IA, Lindegaard KE, Nakstad PH. CTA in patients with acute subarachnoid haemorrhage. A comparative study with selective, digital angiography and blinded, independent review. Acta Radiol 2001; 42:43-9. [PMID: 11167331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
PURPOSE Minimal- or non-invasive methods replacing intra-arterial digital subtraction angiography (IA-DSA) would be of great importance in patients suffering from acute subarachnoid haemorrhage (SAH). The aims of this study were to compare CTA with IA-DSA in patients with acute SAH, to compare CTA interpretations with those of blinded, independent reviewers and to evaluate improvement in CTA diagnostics after 1 year of experience with CTA. MATERIAL AND METHOD During 2 years 162 patients with SAH underwent CTA as well as IA-DSA. Independent blinded review of 77 patients was performed for 1 year. RESULTS Totally 144 aneurysms were demonstrated in 119 patients at IA-DSA, while 43 patients had normal intracranial arteries. Initially 131 aneurysms were detected at CTA while 2 normal, tortuous arteries were misinterpreted as aneurysms, giving a sensitivity of 91% and a specificity of 95%. At independent blinded review the observer agreement was 87% and the kappa value 0.68. CONCLUSION CTA in SAH is of great value in demonstrating vascular anatomy and the exact size of an aneurysm. However, IA-DSA is still needed for diagnostic evaluation in aneurysms smaller than 5 mm in diameter, especially in those located near bony structures.
Collapse
Affiliation(s)
- H K Pedersen
- Department of Radiology, The National Hospital, University of Oslo, Norway
| | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Pedersen HK, Bakke SJ, Hald JK, Skalpe IO, Anke IM, Sagsveen R, Langmoen IA, Lindegaard KF, Nakstad PH. CTA IN PATIENTS WITH ACUTE SUBARACHNOID HAEMORRHAGE. A comparative study with selective, digital angiography and blinded, independent review. Acta Radiol 2001. [DOI: 10.1034/j.1600-0455.2001.042001043.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
10
|
Karlsson J, Mortensen E, Pedersen HK, Sager G, Refsum H. Cardiovascular effects of MnDPDP and mncl2 in Dogs with Acute Ischaemic Heart Failured. Acta Radiol 1997. [DOI: 10.3109/02841859709172408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
11
|
Gudmundsen TE, Ostensen H, Vinje B, Pedersen HK. Imaging routines for the esophagus, small bowel, abdomen, and liver in six Norwegian hospitals from 1975 to 1993. Clin Imaging 1996; 20:256-61. [PMID: 8959364 DOI: 10.1016/0899-7071(95)00037-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The roles of liver scintigraphy in addition to other imaging modalities of the esophagus and the small bowel and the use of abdominal flat films were studied in six Norwegian hospitals between 1975 and 1993. Parallel to the introduction of ultrasonography, the use of liver scintigraphy disappeared almost completely. Barium studies of the esophagus, to some degree, have been replaced by endoscopy, whereas use of barium studies of the small bowel remained unchanged or increased. The number of flat-film studies of the abdomen performed remained unchanged.
Collapse
Affiliation(s)
- T E Gudmundsen
- Department of Radiology, Central Hospital of Buskerud, Drammen, Norway
| | | | | | | |
Collapse
|
12
|
Haahr V, Pedersen HK, Møller JK. [Spread of an imported multiresistant Staphylococcus aureus to other hospitals via secondary colonized patients]. Ugeskr Laeger 1996; 158:3471-2. [PMID: 8650818] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
UNLABELLED A secondary spread of an imported methicillin-resistant Staphylococcus aureus strain (MRSA) to two other patients occurred within a Danish surgical ward in spite of isolation of a multitraumatized index-patient immediately after arrival from a hospital in the Mediterranean area. The two other colonized patients were later transferred to other hospitals in Denmark where it became apparent that they had developed serious infections with the MRSA strain. IN CONCLUSION to prevent spread of imported MRSA within Danish hospitals, strict adherence to isolation procedures and a high level of general hygiene is essential not only when patients are transferred from hospitals situated in endemic areas of MRSA abroad, but also when admitted from Danish hospital wards where known cases of colonisation or infection with MRSA exist.
Collapse
Affiliation(s)
- V Haahr
- Klinisk mikrobiologisk afdeling, Arhus Kommunehospital
| | | | | |
Collapse
|
13
|
Pedersen HK, Jacobsen EA, Refsum H. Coronary arteriography with an oxygenated contrast medium: cardiac effects in dogs with and without acute ischemic heart failure. Acad Radiol 1996; 3:493-9. [PMID: 8796707 DOI: 10.1016/s1076-6332(96)80009-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
RATIONALE AND OBJECTIVES We investigated the possible cardiac effects of oxygen addition to contrast media (CM) during coronary arteriography in dogs that did and did not have ischemic heart failure. METHODS Acute ischemic heart failure was induced by injecting small plastic microspheres into the left coronary artery of 18 dogs. Hemodynamic and electrophysiologic measurements were performed during a single injection before and during heart failure and during a single injection and five rapidly repeated CM injections during heart failure. Iohexol supplemented with electrolytes (iohexol + electrolytes = IPE), oxygenated IPE (IPE+O), Ringer acetate, and oxygenated Ringer acetate were injected into the left coronary artery. RESULTS Single injections of IPE and IPE+O induced small hemodynamic and electrophysiologic effects. However, repeated injections of IPE and IPE+O increased left ventricular inotropy (maximum value of the first derivative of the left ventricular pressure) by 36% and 39%, reduced heart rate by 7% (for both), and lengthened QTc time (corrected QT interval) by 39 and 38 msec, respectively. A comparison of IPE and IPE+O revealed no statistically significant differences. CONCLUSION Although electrolyte addition to nonionic CM may reduce the risk of cardiac complications during coronary arteriography, oxygenation does not seem to significantly further reduce this risk.
Collapse
Affiliation(s)
- H K Pedersen
- Department of Radiology, University of Tromsø, Norway
| | | | | |
Collapse
|
14
|
Jynge P, Falck G, Pedersen HK, Karlsson JO, Refsum H. Sodium-calcium balance in coronary angiography. Experimental experience with isotonic iodixanol. Ann N Y Acad Sci 1996; 779:551-2. [PMID: 8659877 DOI: 10.1111/j.1749-6632.1996.tb44835.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- P Jynge
- Department of Pharmacology and Toxicology, University of Trondheim, Norway
| | | | | | | | | |
Collapse
|
15
|
Pedersen HK, Jacobsen EA, Mortensen E, Refsum H. Contrast-medium-induced ventricular fibrillation: arrhythmogenic mechanisms and the role of antiarrhythmic drugs in dogs. Acad Radiol 1995; 2:1082-8. [PMID: 9419687 DOI: 10.1016/s1076-6332(05)80521-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
RATIONALE AND OBJECTIVES Small electrolyte additions to a nonionic contrast medium reduce the risk of ventricular fibrillation (VF) during wedged catheter injection of a contrast medium. The current study was designed to further investigate contrast-medium-induced VF by studying the effect of pretreatment with different antiarrhythmic drugs. METHODS During a simulated wedged catheter situation, iohexol was injected into the anterior descending branch of the left coronary artery in five open-chest, anesthetized dogs pretreated with lidocaine, propranolol, amiodarone, almokalant, or verapamil. RESULTS Wedging the catheter for 60 sec did not induce VF. However, all 15 wedged catheter injections with iohexol induced VF within 28 sec (19 +/- 1 [mean +/- standard error of the mean]) despite pretreatment with antiarrhythmic drugs. Prior to VF, conduction was slowed and monophasic action potential duration lengthened in the contrast-medium-perfused myocardium, although no significant changes occurred in the control area. CONCLUSION The combination of catheter wedging and long-lasting contrast medium injection has a high risk of causing VF. Although adding a small amount of electrolytes to nonionic contrast media can reduce the risk of VF, antiarrhythmic drug therapy may not have a protective effect.
Collapse
Affiliation(s)
- H K Pedersen
- Department of Radiology, University of Tromsø, Norway
| | | | | | | |
Collapse
|
16
|
Pedersen HK, Jacobsen EA, Mortensen E, Refsum H. Additive hemodynamic and electrophysiologic effects of repeated intracoronary contrast media injections in dogs with heart failure. Acad Radiol 1995; 2:973-9. [PMID: 9419669 DOI: 10.1016/s1076-6332(05)80699-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
RATIONALE AND OBJECTIVES We investigated the cardiac effects of single and repeated contrast media injections in dogs with heart failure and compared the effects of iohexol with iohexol supplemented with electrolytes (30 mmol/l NaCl, 0.15 mmol/l CaCl2, 0.9 mmol/l KCl, and 0.1 mmol/l MgCl2; iohexol + electrolytes [IPE]). Although it has a higher osmolality than iohexol, IPE appears to be safer when injected through a wedged catheter. METHODS Acute ischemic heart failure was induced by injections of small plastic microspheres into the left coronary artery of 16 anesthetized dogs. Iohexol, IPE, and Ringer acetate were injected into the left coronary artery either as a 5-ml single injection or repeatedly five times, once every 10th second. RESULTS Single injections of iohexol and IPE induced small hemodynamic and electrophysiologic effects. However, repeated injections of iohexol and IPE increased the maximum rate of isovolumetric contraction by 46% and 36%, reduced heart rate by 8% and 7%, and lengthened QTc (the Q-T interval corrected for heart rate) time by 44 and 39 msec, respectively. No statistically significant differences were found in a comparison of IPE and iohexol. CONCLUSION During heart failure, repeated injections of iohexol and IPE induced similar additive hemodynamic and electrophysiologic effects without inducing arrhythmias or serious hemodynamic changes.
Collapse
Affiliation(s)
- H K Pedersen
- Department of Radiology, University of Tromsø, Norway
| | | | | | | |
Collapse
|
17
|
Gudmundsen TE, Vinje B, Ostensen H, Pedersen HK. Changes in radiological routines following the introduction of computed tomography. A retrospective study from two Norwegian hospitals. Clin Imaging 1995; 19:201-7. [PMID: 7553438 DOI: 10.1016/0899-7071(94)00054-g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Diagnostic imaging routines have changed rapidly during the last two decades. The real revolution started with the introduction of computed tomography into routine clinical work in the middle of the 1970s. Simultaneously, a tremendous sophistication of ultrasonography took place, and shortly later, magnetic resonance imaging started its "career." The present report explores how the introduction of computed tomography changed imaging routines in two major Norwegian hospitals during the last 10 to 15 years.
Collapse
Affiliation(s)
- T E Gudmundsen
- Department of Radiology, Central Hospital of Buskerud, Drammen, Norway
| | | | | | | |
Collapse
|
18
|
Abstract
Contrast media (CM) affect normal cardiac electrophysiology when injected into the coronary arteries. High-osmolality CM cause more pronounced electrophysiological effects than do low-osmolality CM. Further, both high- and low-osmolality ionic CM have more pronounced effects than the nonionic CM. The CM-induced electrophysiological effects involve regional disturbances of depolarization and repolarization, thereby causing disturbances of impulse conduction as well as dispersion of refractoriness. Recent experimental studies have demonstrated that the addition of sodium or a balanced electrolyte supplement to nonionic CM reduces the risk of ventricular fibrillation (VF), particularly when the CM is injected in a wedged catheter situation. The reduced risk of VF may be due to the small and transient lengthening of repolarization seen in the CM-perfused area of the myocardium. Iodixanol, which is an isotonic nonionic dimer supplemented with NaCl and CaCl(2), is as well tolerated as iohexol during free coronary flow. However, when flow is restricted, such as when CM is injected through a wedged catheter, the risk of VF is less with iodixanol than with iopamidol, iohexol and ioxaglate.
Collapse
Affiliation(s)
- E A Jacobsen
- Department of Radiology, The National Hospital, Oslo Norway
| | | | | | | |
Collapse
|
19
|
Jacobsen EA, Pedersen HK, Kløw NE, Refsum H. Cardiac effects of adding electrolytes and oxygen to iohexol in a dog model of contrast media-induced ventricular fibrillation. Acta Radiol 1995; 36:47-53. [PMID: 7833168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
We investigated whether addition of a balanced electrolyte supplement and oxygen to the nonionic contrast medium iohexol reduces the risk of ventricular fibrillation (VF), and studied regional electrophysiology prior to the VF event. Twenty ml of each test solution were infused at a rate of 0.5 ml/s into the left anterior descending coronary artery (LAD) in 8 anesthetized dogs. LAD was externally occluded during infusion, to simulate a wedged catheter situation. ECG, hemodynamics, regional epicardial monophasic action potential duration (MAPD) and ventricular activation times (VAT) were calculated. All infusions with iohexol caused VF within 27 s. Five of 12 infusions with iohexol + 30 mmol NaCl, 3 of 11 infusions with iohexol+electrolytes (IPE) NaCl, KCl, CaCl2 and MgCl2) and 4 of 11 infusions with IPE with oxygen addition (IPE+O2) caused VF after 45 s. Iohexol did not change MAPD prior to the VF event. Iohexol + 30 mmol NaCl and the IPE solutions lengthened MAPD initially, but at the time of the VF event MAPD were normalized or shortened. We conclude that electrolyte supplement to iohexol may prevent VF, probably by lengthening MAPD.
Collapse
Affiliation(s)
- E A Jacobsen
- Department of Radiology, University Hospital, Tromsø, Norway
| | | | | | | |
Collapse
|
20
|
Jacobsen EA, Pedersen HK, Kløw NE, Refsum H. Cardiac Effects of Adding Electrolytes and Oxygen to Iohexol in a Dog Model of Contrast Media-Induced Ventricular Fibrillation. Acta Radiol 1995. [DOI: 10.1080/02841859509173346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
21
|
Vinje B, Gudmundsen TE, Halvorsen FA, Pedersen HK, Ostensen H. Changes in diagnostic imaging routines of the stomach and the large bowel during the period between 1975 and 1992. Clin Imaging 1995; 19:57-9. [PMID: 7895202 DOI: 10.1016/0899-7071(94)00021-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In a retrospective study on diagnostic imaging of the stomach and large bowel, we evaluated the examination routines in six Norwegian hospitals for the period between 1975 and 1992. For both organ systems, a shift in routines from radiological examination toward endoscopy was observed. For the stomach there was a significant correlation between an increase in the use of endoscopy and a decrease in the use of X-ray examinations. Additionally, the total number of stomach examinations had declined. For the large bowel, the total number of endoscopic and radiological examinations had increased for all hospitals studied. While not as prominent as for the stomach, an obvious shift from X-ray examinations toward endoscopy was observed. These results should be considered when planning new imaging departments and hospitals in Norway.
Collapse
Affiliation(s)
- B Vinje
- Department of Radiology, Central Hospital of Buskerud, Drammen, Norway
| | | | | | | | | |
Collapse
|
22
|
Jacobsen EA, Pedersen HK, Kløw NE, Refsum H. Cardiac Effects of Adding Electrolytes and Oxygen to Iohexol in a Dog Model of Contrast Media-Induced Ventricular Fibrillation. Acta Radiol 1995. [DOI: 10.3109/02841859509173346] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
23
|
Pedersen HK, Jacobsen EA, Refsum H. Contrast media-induced ventricular fibrillation: an experimental study of the effects of dimeric contrast media during wedged catheter injection in dogs. Acad Radiol 1994; 1:136-44. [PMID: 9419477 DOI: 10.1016/s1076-6332(05)80832-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
RATIONALE AND OBJECTIVES We investigated the cardiac effects of an ionic dimer, ioxaglate and two nonionic dimers, iotrolan, and iodixanol. METHODS During a simulated wedged catheter situation, 22 ml of each contrast medium was injected into the left anterior descending branch of the left coronary artery in seven open-chested, anesthetized dogs. RESULTS Of 13 injections with each contrast medium, ioxaglate induced ventricular fibrillation in 11 after 34 +/- 5 sec, iotrolan in 6 after 42 +/- 4 sec, and iodixanol in 3 after 61 +/- 1 sec. Ioxaglate markedly lengthened monophasic action potential duration in contrast medium-perfused myocardium. Iotrolan, and iodixanol induced biphasic changes, first lengthening and then shortening action potential duration. The electrophysiological changes occurred later when using iodixanol. CONCLUSIONS The risk of ventricular fibrillation during long-lasting contrast media exposure to the myocardium, as in a wedged catheter situation, appears to be much lower with iodixanol compared with ioxaglate and also lower than when using iotrolan.
Collapse
Affiliation(s)
- H K Pedersen
- Department of Radiology, University of Tromsø, Norway
| | | | | |
Collapse
|
24
|
Pedersen HK, Jacobsen EA, Refsum H, Kløw NE. Cardiac Effects of Coronary Arteriography with Electrolyte Addition to Iohexol. Acta Radiol 1994. [DOI: 10.3109/02841859409173290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
25
|
Pedersen HK, Jacobsen EA, Refsum H, Kløw NE. Cardiac Effects of Coronary Arteriography with Electrolyte Addition to Iohexol. Acta Radiol 1994. [DOI: 10.1080/02841859409173290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
26
|
Pedersen HK, Jacobsen EA, Refsum H, Kløw NE. Cardiac effects of coronary arteriography with electrolyte addition to iohexol. A study in dogs with and without heart failure. Acta Radiol 1994; 35:77-82. [PMID: 8305279] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Electrolyte addition to nonionic contrast media has been suggested to further reduce the incidence of ventricular fibrillation during coronary arteriography. The present study was designed to investigate the effects of adding 30 mM NaCl, 0.9 mM KCl, 0.15 mM CaCl2 and 0.1 mM MgCl2 to iohexol on cardiac electrophysiology and hemodynamics (iohexol+electrolytes = IPE). Contrast media were injected into the left main coronary artery in 9 open-chest, anesthetized dogs before and after induction of acute ischemic heart failure. IPE increased left ventricular inotropy (LV dP/dtmax) with no initial decrease, even during heart failure. During heart failure IPE induced the same hemodynamic effects as iohexol without electrolyte addition. IPE slightly lengthened epicardial monophasic action potential duration before heart failure. We conclude that IPE appears to be well tolerated hemodynamically. The electrophysiologic differences between IPE and iohexol are small when the injection time is not longer than 5 s.
Collapse
Affiliation(s)
- H K Pedersen
- Department of Medical Physiology, University Hospital, Tromsø, Norway
| | | | | | | |
Collapse
|
27
|
Abstract
It has been assumed that the introduction of ultrasonography in diagnostic imaging has led to dramatic changes in imaging routines by replacing other modalities like angiography, intravenous urography, and computerized tomography in several diagnostic procedures. The present retrospective study from five Norwegian hospitals during the period from 1978 to 1991 confirm this assumption, showing how ultrasonographic examinations have influenced diagnostic routines.
Collapse
Affiliation(s)
- T E Gudmundsen
- Department of Diagnostic Radiology, Central Hospital of Buskerud, Drammen, Norway
| | | | | | | |
Collapse
|
28
|
Jacobsen EA, Kløw NE, Pedersen HK, Refsum H. Repeated intracoronary injections of contrast media. Additive hemodynamic and electrophysiologic effects in a dog model. Invest Radiol 1993; 28:917-24. [PMID: 8262746 DOI: 10.1097/00004424-199310000-00012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
RATIONALE AND OBJECTIVES Coronary arteriography in patients implies several selective injections into the coronary arteries. The authors investigate whether repeated injections cause additive cardiac hemodynamic and electrophysiologic effects in dogs. METHODS Five repeated injections of 5 mL iohexol (Omnipaque 350 mgI/mL, Nycomed Imaging AS, Oslo, Norway), ioxaglate (Hexabrix 320 mgI/mL, Laboratory Guerbet, Cedex, France), and sodium meglumine-diatrizoate (Renografin-76 370 mgI/mL, Squibb Diagnostics, Princeton, NJ) were given into the left coronary artery in 7 anesthetized dogs and were compared with the effects after a 5 mL single injection of the same medium. Left ventricular (LV) pressures, LV dP/dtmax (inotropy) and epicardial monophasic action potential were recorded, from which monophasic action potential duration (MAPD) was measured. RESULTS Repeated injections of ioxaglate and sodium meglumine-diatrizoate did not potentiate initial decrease in LV pressures and inotropy, but the secondary increase in LV inotropy increased more after repeated injections than after a single injection. Repeated injections of iohexol increased LV inotropy more than a single injection. All contrast media prolonged MAPD more after repeated injections than after single injections. MAPD was prolonged 30 sec after the last injection. CONCLUSION Repeated injections of contrast media cause greater cardiac hemodynamic and electrophysiologic effects than a single injection during selective coronary arteriography.
Collapse
Affiliation(s)
- E A Jacobsen
- Department of Medical Physiology, University of Tromsø, Norway
| | | | | | | |
Collapse
|
29
|
Gudmundsen TE, Vinje B, Blørstad O, Ostensen H, Pedersen HK. [Diagnostic imaging of the gastrointestinal and biliary tracts. Pattern of examinations during the period 1975-90]. Tidsskr Nor Laegeforen 1992; 112:2852-5. [PMID: 1412323] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
The procedures used for imaging of the gastrointestinal tract, the gall bladder and the bile ducts were registered in six Norwegian hospitals during the period 1975-90. Data obtained from all hospitals showed a significant decrease in radiological examinations of the stomach and the large bowel, and a dramatic decrease of such examinations in the case of the gall bladder and bile ducts. The changes are mainly due to the increasing use of newer methods such as ultrasonography, gastroscopy and colonoscopy. The shift in the pattern of examinations, as shown in the present study, may well have many implications for patients and for the health service as a whole.
Collapse
|
30
|
Pedersen HK, Vatne K, Simonsen S. Restenosis after percutaneous transluminal coronary angioplasty. Acta Radiol 1992; 33:149-51. [PMID: 1562409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Restenosis after percutaneous transluminal coronary angioplasty was demonstrated in 61 (29%) of 210 successfully treated patients. Mostly it occurred within 4 months after treatment and in arteries less than 3 mm in diameter. Careful clinical follow-up is therefore particularly important early after angioplasty of smaller arteries. Redilation can be performed without increased risk of restenosis.
Collapse
Affiliation(s)
- H K Pedersen
- Department of Radiology, National Hospital, University of Oslo, Norway
| | | | | |
Collapse
|
31
|
Pedersen HK, Vatne K, Simonsen S. Restenosis after Percutaneous Transluminal Coronary Angioplasty. Acta Radiol 1992. [DOI: 10.3109/02841859209173150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
32
|
Pedersen HK, Vatne K, Simonsen S. Restenosis after Percutaneous Transluminal Coronary Angioplasty. Acta Radiol 1992. [DOI: 10.1080/02841859209173150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
33
|
Gudmundsen TE, Vinje B, Ostensen H, Blørstad O, Pedersen HK. Radiological examinations of the urinary tract. Changes during the last 24 years. Scand J Urol Nephrol 1992; 26:155-60. [PMID: 1626205 DOI: 10.1080/00365599.1992.11690447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Procedures for imaging the urinary tract have been recorded in six Norwegian hospitals for the last 24 years. For three of the hospitals, data were collected from 1965 to 1989, and for the other three from 1966, 1971 and 1975, respectively. There was a significant reduction in the number of intravenous pyelograms, voiding cystograms, and renal angiograms, but the number of retrograde pyelograms and plain radiographs of the urinary tract remained constant. Computed tomography of the urinary tract increased during the first years, but after the introduction of ultrasonography, the number of computed tomograms decreased. Ultrasonographic examinations of the urinary tract are still rapidly increasing, and seem to have replaced some of the other imaging techniques. The present results should be taken into consideration when planning the health care for the future.
Collapse
Affiliation(s)
- T E Gudmundsen
- Department of Diagnostic Radiology, Central Hospital of Buskerud, Drammen, Norway
| | | | | | | | | |
Collapse
|
34
|
Pedersen HK, Vatne K, Simonsen S. [Restenosis after coronary angioplasty]. Tidsskr Nor Laegeforen 1990; 110:830-2. [PMID: 2321207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Angiography of 169 patients who had been treated successfully with PTCA showed restenosis in 61. Of these, 38 were successfully treated with a new PTCA, and six developed a new restenosis. Restenosis usually appears during the first four months after PTCA in vessels with a diameter less than three millimeters. The authors emphasize the importance of careful clinical follow-up.
Collapse
Affiliation(s)
- H K Pedersen
- Røntgen-radiumavdelingen, Røntgenavdelingen, Regionsykehuset i Tromsø
| | | | | |
Collapse
|
35
|
Pedersen HK, Simonsen S. Coronary artery-left ventricle fistula. AJR Am J Roentgenol 1989; 153:1098. [PMID: 2637691 DOI: 10.2214/ajr.153.5.1098-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
36
|
Vatne K, Pedersen HK, Laake B, Brodahl U, Levorstad K, Simonsen S. Percutaneous transluminal coronary angioplasty. Six years experience. Acta Radiol 1989; 30:475-9. [PMID: 2611052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In a six-year period (1982-1987), 248 patients were treated with 297 procedures (percutaneous transluminal coronary angioplasty, PTCA) on 282 vessels. Two hundred and fifty-nine (87.2%) of the procedures in 210 (76.7%) of the patients appeared successful angiographically. Thirty-eight procedures were unsuccessful due to failure to pass the stenosis in 18 patients, dissection or occlusion of the treated vessel in 11, and significant residual stenosis in 9 patients. Emergency operations were performed after 11 (3.7%) of the procedures. Two patients died postoperatively. Myocardial infarction was seen in 13 patients, of whom 4 developed pathologic Q-waves in their ECG. Restenosis occurred in 60 (28.6%) of the patients. In the last year of the study, the patients selected for PTCA were in a poorer state angiographically, but the results of PTCA were better, without any increase of the complication rate. Our results, which are in accordance with others, support the concept that PTCA is a relatively safe procedure with a primary success rate of almost 90 percent. However, approximately one third of the patients developed restenosis, which in most cases occurred within 3 months.
Collapse
Affiliation(s)
- K Vatne
- Department of Radiology, Rikshospitalet, Oslo, Norway
| | | | | | | | | | | |
Collapse
|
37
|
Pedersen HK, Røyset P. [Varicose anomalous pulmonary veins]. Tidsskr Nor Laegeforen 1988; 108:1614-5. [PMID: 3413746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
|
38
|
Pape JF, Gudmundsen TE, Ostensen H, Pedersen HK. [Urinary tract infections in women. Should intravenous urography be done in recurrent infections?]. Tidsskr Nor Laegeforen 1988; 108:120-1. [PMID: 3353905] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
|
39
|
Abstract
Three hundred and twenty consecutive patients with hypertension were referred to examination with intravenous urography. Only 2 of the 320 urograms performed showed abnormalities possibly related to hypertension. Renal angiography was performed in 39 (12%) of the patients. Seventeen (7%) subjects had renal artery stenosis, of whom 8 (2.5%) were referred to surgery. Four became normotensive and the other 4 had a more treatable hypertension. Urography is an expensive and insensitive method for evaluation of patients with hypertension and should be abandoned. Proper treatment of renovascular hypertension demands the performance of renal angiography. We therefore suggest a program for primary use of renal angiography in the examination of patients with suspected renovascular hypertension.
Collapse
Affiliation(s)
- J F Pape
- Department of Internal Medicine, University Hospital, Tromsø, Norway
| | | | | |
Collapse
|
40
|
Pedersen HK, Gudmundsen TE, Ostensen H, Pape JF. [Urography in children. Indications and findings]. Tidsskr Nor Laegeforen 1987; 107:1871-2. [PMID: 3660368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
|
41
|
Pedersen HK, Gudmundsen TE, Ostensen H, Pape JF. [Urography. Presentation of 3,856 patients in Tromsö examined for the first time]. Tidsskr Nor Laegeforen 1987; 107:460-1. [PMID: 3576531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
|
42
|
Abstract
This report derives from Tromsoe in northern Norway. In a retrospective study of the indications for intravenous urography (IU) and the findings at IU in 740 patients (451 girls and 289 boys) aged 0-19 years, we found that urinary tract infections accounted for 69.4% of the IU in females 30.1% of the IU in males, most often seen in the youngest patients. The pathological findings most frequently seen were anomalies (17 females and 10 males) and urinary tract obstruction (3 females and 15 males). The present study indicates the following: first, that the yield of IU in the primary investigation of children and youth suffering from enuresis and non-specific abdominal disturbancies is small; and second, that the use of IU in children and youth with urinary tract infection and haematuria should be questioned and reconsidered.
Collapse
Affiliation(s)
- H K Pedersen
- Department of Radiology, University Hospital of Tromsoe, Norway
| | | | | | | |
Collapse
|
43
|
Gudmundsen TE, Pedersen HK, Ostensen H, Pape JF. [Urography in hypertension. Practical consequences of recent information]. Tidsskr Nor Laegeforen 1986; 106:3012-3. [PMID: 3810627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
|
44
|
Pedersen HK, Ostensen H. [False negative computer tomography. Diffuse, obscure abdominal diseases]. Tidsskr Nor Laegeforen 1986; 106:1095-7. [PMID: 3726837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
|
45
|
Pedersen HK, Pape JF, Gudmundsen TE, Ostensen H. Intravenous urography and voiding cystoureterography in northern Norway: a retrospective study. Pediatr Radiol 1986; 16:472-4. [PMID: 3774393 DOI: 10.1007/bf02387960] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Intravenous urography (IU) was performed in 489 patients aged 0-9 years during 1980-1983. A total of 35 (7.2%), 19 (13.1%) boys and 16 (4.7%) girls had pathological changes at IU. Of these, 11 boys and 5 girls had findings with therapeutic consequences. We have analysed the results of IU and voiding cystoureterography (VC) in 62 patients and show that a normal IU does not exclude vesicoureteral reflux into the renal pelvis. By performing only VC hydronephrosis, pyelonephritic scarring and anomalies may be missed.
Collapse
|