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1.
Frequency of pulmonary mineralization and hypoxemia in 21 dogs with pituitary-dependent hyperadrenocorticism 总被引:1,自引:0,他引:1
Berry CR Hawkins EC Hurley KJ Monce K 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2000,14(2):151-156
The purpose of this study was to determine the frequency of hypoxemia and pulmonary mineralization using 99m Tc-methylene diphosphonate (99m Tc-MDP) in dogs with pituitary-dependent hyperadrenocorticism (PDH). Twenty-one dogs with PDH were pro-spectively evaluated using thoracic radiography, arterial blood gas analysis, and bone phase and pulmonary perfusion scintigraphy (using 99m Tc-macro-aggregated albumin [99m Tc-MAA]). The radiographs and bone and perfusion studies were evaluated subjectively. An averaged quantitative count density ratio was calculated between the thorax and cranial thoraco-lumbar vertebrae from lateral thoracic 99m Tc-MDP images. Thoracic: vertebral ratios were calculated using 99m Tc-MDP studies from 21 control dogs. The thoracic: vertebral ratios were compared between the 2 groups (PDH and control). The mean age (±SD) of the 21 PDH dogs was 10.2 (±3) years, whereas the mean age of the control group was 9.8 (±3) years. Seven of the 21 dogs with PDH were hypoxemic (denned as an arterial partial pressure of oxygen [PaO2 ] <80 mm Hg) with an average PaO2 (±SD) of 62 (±15) mm Hg. Of the 7 hypoxemic dogs, 2 were found to have pulmonary mineralization based on bone scintigraphic images. Pulmonary perfusion abnormalities were not identified using 99m Tc-MAA in any of the 21 PDH dogs. Six PDH dogs had an abnormal interstitial pulmonary pattern and 5 of these dogs were hypoxemic. The average quantitative thoracic: vertebral ratio was not significantly different between the PDH and control dogs (0.5 ± 0.4 versus 0.4 ± 0.1, P = .16). Causes of hypoxemia other than pulmonary thromboembolism should be considered in dogs with PDH. Pulmonary mineralization may contribute to hypoxemia in dogs with PDH. 相似文献
2.
Ten scintigraphic gastrointestinal bleeding localization examinations were done in nine dogs. All dogs had clinical evidence of gastrointestinal bleeding prior to or on the day of the examination. Scintigraphy was done by in vivo labeling of red blood cells with 99m Technetium and imaging serially with a gamma camera over a 21-hour period. Of the nine dogs, four case history reports are presented. Three of these dogs had positive scintigraphic examinations. One dog had a negative scan but was later shown to have been ingesting material that mimicked the appearance of melena. 相似文献
3.
Craig A. Harms DVM James J. Hoskinson DVM David S. Bruyette DVM James W. Carpenter MS DVM Johna K. Veatch DVM PhD 《Veterinary radiology & ultrasound》1994,35(6):473-478
Thyroid scintigraphy using sodium 99m Technetium pertechnetate (99 TcO4 -) was performed in normal and radiothyroidectomized cockatiels ( Nymphicus hollandicus ). 131 I scintigraphy was performed in the course of ablating the thyroid glands. The thyroid glands in normal birds were clearly visualized, but were not individually resolvable. Thyroid glands were not visualized in thyroid-ablated birds. With 99m TcO4 scans, thyroid (or other region of interest)/body count density ratios were used for comparisons of normal and thyroid-ablated birds. Normal 99m TcO4 - thyroid/body ratios (mean +/− SD) for the dorsal and lateral views were 1.83 +/− 0.31 and 1.70 +/− 0.34 respectively. Pertechnetate thyroid/body count density ratios decreased (to 0.93 -/−0.14 and 0.88 +/− 0.12 for dorsal and lateral views respectively) after thyroid ablation, while crop/body ratios increased. 99m TcO4 - thyroid scintigraphy, therefore, was capable of detecting hypofunctional thyroid abnormalities in 131 I radiothyroidectomized cockatiels. 相似文献
4.
Steven H. Harnagel DVM William J. Hornof DVM MS Philip D. Koblik DVM MS Paul E. Fisher BS 《Veterinary radiology & ultrasound》1989,30(1):22-27
This study was undertaken to design protocol for use of radioaerosol of technetium-99m-labeled diethylenetriaminepentacetic acid (99m Tc-DTPA) for ventilation imaging as clinical tool in the dog and to evaluate imaging characteristics in both normal dogs and dogs with simulated pulmonary embolism. Clearance of the 99mTc-DTPA radioaerosol from the lung was also evaluated. Six normal dogs were used in two phases: (1) as their own controls and (2) during pulmonary artery occlusion using Swan-Ganz catheter. Radioaerosol ventilation images were obtained and rate of clearance from normal and occluded lungs determined. Perfusion studies using technetium-99m-macroaggregated albumin (99m Tc-MAA) immediately followed. Clearance half-times (T1/2 ) were found to be significantly increased (p < 0.05) in acutely occluded lungs; however, the small magnitude of this change was visually difficult to detect on the ventilation images. Good quality initial ventilation and perfusion images were obtained and provided ready evaluation of ventilation (V), perfusion (Q), and induced V/Q mismatches. A clinical case of pulmonary thromboembolic disease was also evaluated with diagnostic result, indicating that this method of V/Q scintigraphy can provide useful information in those clinical cases in which pulmonary thromboembolism is suspected. 相似文献
5.
MANUEL PINILLA ROBERT E. SHIEL SHEILA F. BRENNAN HESTER McALLISTER CARMEL T. MOONEY 《Veterinary radiology & ultrasound》2009,50(2):224-229
The existence of hypothyroidism in greyhounds remains controversial and its investigation is complicated by the low circulating thyroid hormone concentrations typically found in healthy dogs of this breed. Quantitative measurement of thyroidal technetium-99m pertechnetate (99m TcO4 − ) uptake is known to be useful in assessing thyroid function in other breeds. The aim of this study was to evaluate thyroid scintigraphy as a method of assessing thyroid function in greyhounds suspected of primary hypothyroidism. Twenty greyhounds (eight females, 12 males) were studied. Thirteen had bald thigh syndrome and seven poor performance and low total T4. Total T4 concentrations were decreased in 18 (90%), and free T4 in two (10%) dogs. All canine thyroid stimulating hormone concentrations were within the reference interval. Thyroidal 99m TcO4 − uptake values (mean ± SD, 0.76 ± 0.26%) were within the reference limits published for euthyroid dogs (0.39–1.86%) making hypothyroidism highly unlikely. There were no significant differences ( P <0.05) when comparing data between dogs with bald thigh syndrome (13 dogs) and the remaining dogs (seven dogs). Seventeen (85%) dogs had higher uptake in the left thyroid gland than in the right that might reflect an anatomic feature of the greyhound breed. Calculation of percent thyroidal uptake of 99m TcO4 − is more accurate than thyroid:salivary gland ratios because of high variability in salivary gland uptake. Percent thyroidal uptake of 99m TcO4 − should be used when assessing thyroid function scintigraphically in the greyhound breed. 相似文献
6.
MARK B. PARCHMAN DVM JAMES A. FLANDERS DVM DipiomatACVs HOLLIS N. ERB DVM PhD ROBERT WALLACE BS FRANCIS A. KALLFELZ DVM PhD 《Veterinary surgery : VS》1990,18(6):454-458
Nuclear medical bone imaging was used in combination with targeted radiography to detect metastatic or multicentric lesions in 23 dogs with skeletal neoplasms. Each dog with a radio-graphically diagnosed skeletal neoplasm was injected with Technetium-99m labeled methylene diphosphonate (99m Tc-MDP) (15.0 mCi intravenously) for whole body imaging. All areas with increased uptake of 99m Tc-MDP were radiographed. In 19 dogs, the amount of bone shaft involvement in primary sites indicated by bone imaging was larger than the amount indicated by radiography. Eighteen dogs had secondary areas of increased 99m Tc-MDP uptake, six of which had secondary areas that were suspected radiographically to be neoplastic. Four dogs had lesions characterized histologically as neoplasia, one as bone infarction and one as normal cortical bone. Positive predictive value for this strategy was 66.7%. Results of this study suggest that nuclear medical bone imaging with targeted radiography is a quick, noninvasive technique with a good positive predictive value for evaluation of the skeleton for metastatic or multicentric sites of neoplasia. 相似文献
7.
William H. Adams DVM Michael A. Walker DVM Gregory B. Daniel DVM MS Mark G. Petersen DVM MA Alfred M. Legendre DVM MS 《Veterinary radiology & ultrasound》1995,36(5):417-424
Seven dogs with thyroid gland carcinoma were treated with 131 I and hormone suppressive therapy either alone (3 dogs) or in combination with surgery (3 dogs) or 137 Cs teletherapy and chemotherapy (1 dog). Empirically chosen doses of 75 to 137 mCi of 131 I were given orally (2 dogs) and intravenously (5 dogs). Adverse effects were limited to acute, transient bone marrow hypoplasia and pancytopenia. Nominal objective reduction in tumor volume or size and number of pulmonary metastases was observed in 4 dogs treated with 131 I and thyroxine. Of these 4 dogs, 2 had stable disease for periods of 4 and 12 months while a third dog had stable disease for 27 months following two 131 I treatments at 3 month intervals. The fourth dog had progressive disease. Two dogs with mediastinal metastases showed reduction in localization of 99m Tc pertechnetate and radioiodine following 2 and 3 treatments using 131 I. It appears that relatively high doses of 131 I can be used safely for the treatment of canine thyroid tumors and that further investigation can be justified to define its efficacy. 相似文献
8.
Christopher R. Lamb MA VetMB MRCVS Scott H. Schelling DVM John Berg DVM MS 《Veterinary radiology & ultrasound》1989,30(6):268-271
Localization of 99m Tc-MDP in lymph nodes was apparent on the three-hour bone-scan image in seven dogs. In six dogs injection or leakage of the radiopharmaceutical into the perivascular tissues was associated with subsequent uptake in an ipsilateral lymph node. In the remaining dog, 99m Tc-MDP localized in a lymph node infiltrated by metastatic osteosarcoma. This aided staging of the tumor. Possible mechanisms of 99m Tc-MDP localization in soft tissues are briefly reviewed. 相似文献
9.
Quantitative hepatobiliary scintigraphy using 99m Tc-2,6 diisopropylphenylcarbamoylmethyl iminodiacetic acid (DISIDA) was performed in normal dogs. 99m Tc-DISIDA is excreted by the hepatocyte into the biliary tract. Hepatic blood flow from arterial and portal venous sources was measured as the hepatic perfusion index. The hepatic clearance of the radiopharmaceutical was used to assess hepatocyte function and parenchymal biliary transport. Biliary ejection was evaluated using synthetic cholecystokinin infusion. The procedure should be useful in evaluating dogs with hepatic and biliary disease. 相似文献
10.
MICHAEL R. METCALF DVM MS ROBERT C. ROSENTHAL DVM PHD LOUIS C. SELLETT MS ROBERT R. BADERTSCHER II DVM PHD 《Veterinary radiology & ultrasound》1986,27(5):155-160
The scintigraphic characteristics of lymph nodes draining the ventral body wall were analyzed in 12 dogs as to their pattern of appearance and image contrast. Each dog was scanned using 99m Tc-antimony sulfide colloid and 99m Tc-dextran, and the imaging characteristics of these agents were compared. A large degree of variability exists in the number and pattern of lymph node appearance with either agent. No significant difference in average numbers of lymph nodes per dog was shown between agents. However, 99m Tc-antimony sulfide colloid provided a significantly (p<.05) better target-to-background ratio, which determines the contrast with which lymph nodes stand out from background activity. From these findings, it is suggested that too great a variability in lymph node appearance exists using this procedure to allow a high degree of confidence in the diagnosis of metastasis to lymph nodes of the ventral body wall. However, for other purposes, 99m Tc-antimony sulfide colloid is the lymphoscintigraphic agent of choice. 相似文献
11.
Fusellier M Desfontis JC Le Roux A Madec S Gautier F Thuleau A Gogny M 《Journal of veterinary pharmacology and therapeutics》2008,31(2):150-155
The aim of the study was to investigate the renal function in clinically normal dogs receiving meloxicam and pimobendan alone or in combination. Ten adult female beagle dogs were administered the treatment for 7 days in a randomized crossover trial (control/meloxicam/pimobendan/meloxicam and pimobendan). Renal function was assessed by blood urea, creatinine, sodium, potassium and chloride concentrations and by glomerular filtration rate, measured by means of renal scintigraphy [renal uptake of 99m Tc-diethylenetriaminepentacetic acid (DTPA)] and plasma clearance of 99m Tc-DTPA. As compared with the control group, renal uptake and plasma clearance of 99m Tc-DTPA were not significantly modified after a 7-day period of treatment with meloxicam or pimobendan alone, or meloxicam and pimobendan in combination. Furthermore, urea, creatinine, sodium, potassium and chloride levels in the serum of the dogs during the 7-day period treatment were not significantly modified in relation to the treatments. It was therefore concluded that meloxicam and pimobendan alone or in combination did not alter renal function in healthy dogs. 相似文献
12.
This report describes the use of 99m technetium pertechnetate (99m TcO4 − ) and 131 [for imaging of a metastatic thyroid carcinoma in a dog. The 131 ] imaging showed metastatic lesions undetected by the 99m TcO4 − imaging on 2 separate occasions. The possible mechanisms for the discrepancies between 131 I and 99m TcO4 − imaging of thyroid carcinomas are discussed. The use of 131 I for the imaging of functional thyroid carcinomas in the dog is recommended. 相似文献
13.
Gregory B. Daniel DVM MS Ronald Bright DVM MS Eric Monnet DVM Paul Ollis RT 《Veterinary radiology & ultrasound》1990,31(4):175-181
Per-rectal portal scintigraphy using tech-netium-99m pertechnetate (99m TcO4 - ) was performed in 8 normal dogs before and after surgical creation of a portacaval shunt. Shunt fractions were calculated by computer assisted analysis of dynamic images (IMG) and compared to shunt fractions determined by mesenteric venous injection of radioactive microspheres (MIC). The mean pre-operative shunt fraction was 1.59% using IMG and 3.00% using MCI. The mean postoperative shunt fraction was 64.56% using IMG and 69.56% using MIC. There was excellent correlation between both methods (r2 0.94). Per-rectal portal scintigraphy is an easily performed, inexpensive method to diagnose and quantify portosystemic shunts in dogs. 相似文献
14.
Philip D. Koblik DVM MS Chi-Kwan Yen MD Jan Komtebedde DVM William J. Hornof DVM MS Peter F. Moore BvSc PhD Paul E. Fisher MS 《Veterinary radiology & ultrasound》1990,31(4):170-174
Shunt fraction was determined using transcolonic 123 I-iodoamphetamine (IMP) and portal vein injection of 99m Tc-macroaggregated albumin (MAA) in a group of eight dogs with chronic cirrhosis and acquired portosystemic shunts subsequent to total common bile duct ligation. Hepatic parenchymal damage was confirmed by alterations in liver function tests and liver histology. Seven of the eight dogs developed portal hypertension and had angiographic evidence of hepatofugal portal blood flow with multiple peripheral portosystemic anastomoses. Shunt fractions determined in the seven dogs with shunts varied from 39 to 100 using IMP and 45 to 93 using MAA. The remaining dog had normal portal pressure, a normal portal angiogram, and normal IMP and MAA scintigraphic studies. There was an excellent correlation between the two methods of shunt fraction calculation (R2 = 0.98) and the line of regression was not significantly different from unity (IMP = 1.09 × MAA - 0.03). 相似文献
15.
J. C. COELHO R. TUCKER J. MATTOON G. ROBERTS D. K. WAITING & K. L. MEALEY 《Journal of veterinary pharmacology and therapeutics》2009,32(5):417-421
P-glycoprotein (P-gp), the product of ABCB1 gene, is thought to play a role in the biliary excretion of a variety of drugs, but specific studies in dogs have not been performed. Because a number of endogenous (ABCB1 polymorphisms) and exogenous (pharmacological P-gp inhibition) factors can interfere with normal P-gp function, a better understanding of P-gp's role in biliary drug excretion is crucial in preventing adverse drug reactions and drug–drug interactions in dogs. The objectives of this study were to compare biliary excretion of technetium-99m-sestamibi (99m Tc-MIBI), a radio-labelled P-gp substrate, in wild-type dogs (ABCB1 wild/wild), and dogs with intrinsic and extrinsic deficiencies in P-gp function. Dogs with intrinsic P-gp deficiency included ABCB1 mut/mut dogs, and dogs with presumed intermediate P-gp phenotype (ABCB1 mut/wild). Dogs with extrinsic P-gp deficiency were considered to be ABCB1 wild/wild dogs treated with the P-gp inhibitor ketoconazole (5 mg/kg PO q12h × 9 doses). Results from this study indicate that ABCB1 mut/mut dogs have significantly decreased biliary excretion of 99m Tc-MIBI compared with ABCB1 wild/wild dogs. Treatment with ketoconazole significantly decreased biliary excretion of 99m Tc-MIBI in ABCB1 wild/wild dogs. P-gp appears to play an important role in the biliary excretion of 99m Tc-MIBI in dogs. It is likely that concurrent administration of a P-gp inhibitor such as ketoconazole will decrease P-gp-mediated biliary excretion of other substrate drugs as well. 相似文献
16.
Paul Y. Barthez DVM William J. Hornof DVM MS Larry D. Cowgill DVM PhD Larry A. Neal BS Paul Mickel 《Veterinary radiology & ultrasound》1998,39(5):470-474
The scintigraphically measured percentage dose uptake of 99m Tc-DTPA by the kidneys and the plasma clearance of 99m Tc-DTPA have been reported to correlate well with inulin clearance. These two parameters were evaluated in seven dogs with known or suspected naturally occurring renal disease and compared to simultaneously measured renal inulin clearance. Correlation between inulin clearance and the 99m Tc-DTPA plasma clearance was better ( p =.0016) than the correlation between the percentage DTPA uptake by the kidney. It was concluded that measurement of 99m Tc-DTPA plasma clearance is a more accurate method to estimate global glomerular filtration rate (GFR) than the percentage kidney uptake. 相似文献
17.
Gregory B. DanielDVM MS Rodger V. Allhands DVM PhD 《Veterinary radiology & ultrasound》1989,30(2):74-79
Monoclonal antibodies specific for Dirofilaria immitis were labeled with technetium-99m (99m Tc) and tested in vivo in five heartworm positive and five heartworm negative dogs. Diethlyenetriaminepentaactic acid (DTPA) was used to label the 99m Tc to the antibody. Radiochemical purity of the 99m Tc-labeled antibodies (99m Tc-MoAb) was determined by gel filtration and by instant thin-layer chromatography. The uptake percentages in the blood, heart, lung, liver, and kidneys were determined from tissues obtained at necropsy and by computer analysis of images obtained at two and 24 hours. The percent uptake in the heart region of interest (ROI) at two hours was significantly higher in the heartworm-positive dogs. There was significant correlation between the uptake in the heart at two hours to the number and activity of the worms at necropsy. 相似文献
18.
Phillip F. Steyn BVSc MRCVS MS Gregory Ogilvie DVM 《Veterinary radiology & ultrasound》1995,36(5):411-416
Technetium-99m methoxy-isobutyl-isonitrile (sestamibi) imaging of malignant canine lymphoma was performed in thirteen dogs 1 hour after intravenous injection of 99m Tc-sestamibi at 13 MBq (0.35 mCi) per kilogram body weight. Abnormal tracer uptake was visualized in the liver, spleen, bone marrow, and mesenteric, inguinal, popliteal, sternal, cranial cervical and mandibular lymph nodes. Radiopharmaceutical uptake was also noted in a nasal mass. One large neoplastic renal mass did not have demonstrable sestamibi uptake. Other regions had no significant difference in the target:background ratios when compared with values from normal dogs ( P > 0.05). 99m Tc-sestamibi can be used to image malignant lymphoma, and has potential applications in the management of patients to document response to treatment and to stage of extent of disease. 相似文献
19.
A young female Boxer had a history of chronic soft stool. Survey abdominal radiographs were unremarkable. A duodenal diverticulum was identified in abdominal ultrasound and barium upper-gastrointestinal contrast examinations. Before surgery a 99m Tc-pertechnetate study was performed to evaluate for ectopic gastric mucosa in the duodenal diverticulum. Focal abnormal increased radioactivity was identified in the right caudal abdominal quadrant. The diverticulum was excised. Upon histopathologic examination of the duodenal diverticulum, ectopic gastric mucosa was not identified but ectopic pancreatic tissue was found. Mild eosinophilic inflammation within the diverticulum was suspected to be the cause of the mild 99m Tc uptake seen in this dog. 相似文献
20.
Phillip F. Steyn BVSc MRCVS MS Gregory Ogilvie DVM 《Veterinary radiology & ultrasound》1995,36(2):160-163
Technetium-99m methoxy-isobutyl-isonitrile (sestamibi) is a radiophartnaceutical used for the evaluation of myocardial perfusion. Increased uptake of sestamibi has also been documented in tumors. The objective of this study was to document the extracardiac biodistribution of 99m Tc sestamibi in the normal dog. Nine normal beagles were given 0.35 mCi/kg 99m Tc sestamibi intravenously, and 60 second images were made of the entire body at 1 hour post injection. A defined distribution pattern was recognized, with good visualization of the heart, liver, gallbladder, small intestine, kidneys, urinary bladder, popliteal lymph nodes, parotid salivary glands and zygomatic salivary glands. Splenic uptake was not seen.
Target to background ratios were calculated for all the regions listed, using background regions-of-interest with the smallest coefficient of variance for the denominator. The mean, range and standard deviation of these ratios are given. 相似文献
Target to background ratios were calculated for all the regions listed, using background regions-of-interest with the smallest coefficient of variance for the denominator. The mean, range and standard deviation of these ratios are given. 相似文献