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1.
QUALITATIVE AND QUANTITATIVE THYROID IMAGING IN FELINE HYPERTHYROIDISM USING TECHNETIUM-99M AS PERTECHNETATE 总被引:1,自引:0,他引:1
Carmel T. Mooney MVB MPhil Keith L. Thoday BVetMed Phd DVD Jeremy J. Nicoll BSc Phd David L. Doxey BVM&S PhdD 《Veterinary radiology & ultrasound》1992,33(5):313-320
Thyroid imaging using technetium-99m as pertechnetate (99m TcO4 ) was carried out in five healthy, euthyroid and 37 hyperthyroid cats using both pinhole and parallel-hole collimators. Images of greater resolution, necessary to distinguish bilateral lobe involvement, were obtained using the pinhole collimator. Per cent thyriod 99m TcO4 - uptake was calculated in each cat and was significanly (P < 0.001) higher in hyperthyroid compared with euthyroid cats. In the hyperthyroid cats, per cent thyroid uptake was significantly correlated with serum total thyroxine (T4) and triiodothyronine (T3) Concentrations. Per cent thyroid 99m TcO4 - uptake is increased in feline hyperthyrodism and may be calculated using a pinhole collimator alone at the time of qalitative assessment of the extent of thyroid tissue involvement. 相似文献
2.
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
3.
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
4.
Suzanne M. Cook DVM Gregory B. Daniel DVM MS Michael A. Walker DVM MS Jeanne M. Maddux DVM PhD Christine C. Jenkins DVM Edward R. Klebanow DVM Donna M. Bouley DVM David F. Dean DVM Mark G. Petersen DVM 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》1993,7(5):303-308
Three cats were diagnosed as hyperthyroid based on clinical signs, historical findings, laboratory abnormalities, and basal serum thyroxine (T4 ) concentrations, and/or nuclear thyroid scans. Additionally, a presumptive diagnosis of thyroid carcinoma with pulmonary metastasis was made in each cat based on radiographic or scintigraphic evaluation. All three cats had solitary pulmonary nodules 1.5 to 2 cm in diameter on survey thoracic radiographs; one cat also had chylous pleural effusion and pulmonary lobar consolidation. Focal pulmonary accumulation of sodium pertechnetate (99m TcO4 -) and/or radioiodine (131 I) corresponding to radiographic lesions were seen in all cats. Two cats were treated with single ablative doses (1111 to 1480 MBq) of131 I; the remaining cat was euthanatized.
One of the treated cats died 8 days later; the other cat was euthanatized 22 weeks following treatment. Histopathologic examination of tissue obtained at necropsy confirmed metastatic thyroid carcinoma in one cat and bronchogenic adenocarcinoma in two cats. Our findings indicate that increased radionuclide uptake in focal pulmonary lesions and cytologic evaluation of tissue obtained by fine-needle aspiration are not specific for thyroid tissue. (Journal of Veterinary Internal Medicine 1993; 7:303–308. Copyright © 1993 by the American College of Veterinary Internal Medicine.) 相似文献
One of the treated cats died 8 days later; the other cat was euthanatized 22 weeks following treatment. Histopathologic examination of tissue obtained at necropsy confirmed metastatic thyroid carcinoma in one cat and bronchogenic adenocarcinoma in two cats. Our findings indicate that increased radionuclide uptake in focal pulmonary lesions and cytologic evaluation of tissue obtained by fine-needle aspiration are not specific for thyroid tissue. (Journal of Veterinary Internal Medicine 1993; 7:303–308. Copyright © 1993 by the American College of Veterinary Internal Medicine.) 相似文献
5.
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
6.
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
7.
E. Vandermeulen I. van Hoek C. De Sadeleer A. Piepsz H.R. Ham T. Bosmans A. Dobbeleir S. Daminet K. Peremans 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2008,22(2):266-272
Background: Chronic kidney failure is frequently seen in middle-aged and elderly cats. 51 Chromium-ethylene diaminic tetraacetic acid (51 Cr-EDTA) clearance and single blood sample (SBS) method are used in several species to estimate the glomerular filtration rate (GFR).
Hypothesis: The hypothesis of this study was that51 Cr-EDTA clearance could be determined using an SBS method in normal and hyperthyroid cats.
Animals: Forty-six cats were included in this study, with an average age of 9.5 years. Of these cats, 27 had hyperthyroidism; 19 were healthy.
Methods: After IV injection of51 Cr-EDTA (average dose: 4.25 MBq), 7 blood samples were obtained between 5 and 240 minutes. Reference clearance was calculated in mL/min and mL/min/kg body weight, using a 2-compartment model. Optimal time for clearance measurement with SBS was then determined by systematically comparing each individual plasma concentration to the reference multisample clearance.
Results: The average reference plasma clearance of51 Cr-EDTA for all cats was 14.9 mL/min (3.7 mL/min/kg). The clearance in hyperthyroid cats averaged 16.4 mL/min (4.3 mL/min/kg) and in normal cats averaged 10.3 mL/min (2.4 mL/min/kg).
The optimal time for the SBS was 48 minutes after injection of tracer51 Cr-EDTA ( R 2 = 0.9414), giving the following converting equation: clearance = (0.0066 × DV48 minutes ) – 0.9277 (in mL/min).
Conclusions and Clinical Importance: In this study, the single sample51 Cr-EDTA clearance method was used to estimate the global GFR in cats. The method identified differences in clearance between normal and hyperthyroid cats. The optimal time for an SBS was 48 minutes. 相似文献
Hypothesis: The hypothesis of this study was that
Animals: Forty-six cats were included in this study, with an average age of 9.5 years. Of these cats, 27 had hyperthyroidism; 19 were healthy.
Methods: After IV injection of
Results: The average reference plasma clearance of
The optimal time for the SBS was 48 minutes after injection of tracer
Conclusions and Clinical Importance: In this study, the single sample
8.
William H. Adams DVM Gregory B. Daniel DVM MS Mark G. Petersen DVEM Karen Young BS 《Veterinary radiology & ultrasound》1997,38(4):323-328
This study was done to investigate the validity of published canine thyroid/salivary (TS) rations of approximately i in normal dogs and to detemine thyroid uptak of 99m Tc-pertechnetate (pertechnetate) measured as percent uptake of injected dose. These parameters were evaluated in 13 Beagle dogs over a 4 hour period. Mean ± standard deviation (SD) and median T/S ratios of 1.2 ± 0.3 and 1.1 were essentially the same at twenty minutes and 1 hour. T/S Values ranged from 0.9 to 2.2 at 20minutes and from 0.8 to 2.4 at 1 hour. T/S ratio values progressively declined over the subsequent time intervals with mean ± SD and median values of 0.6 ± 0.2 and 0.6, respectively, measured at 4 hour. The mean with a rang of 0.28% to 0.90%. The mean ± SD time interval from injection of pertechanetate to maximum uptake within the thyroid gland was 160 ± 55 minutes with a range 31–240 minutes. The data derived from this study of normal dogs may be useful in the evaluation of dogs with thyroidal diseases including hypthyroidism 相似文献
9.
Russell L. Tucker DVM Gregory B. Daniel DVM MS Sandra L. Daniel DVM MS PhD Theresa Buckman AHT 《Veterinary radiology & ultrasound》1992,33(4):241-246
Technetium-99m hexamethylpropyleneamine oxine (99m Tc-HMPAO) and Indium-111 oxine (111 In-oxine) labeled canine gramulocytes were evaluated in vitro over a six hour period. Labeling efficiency for 99m TC-HMPAO and 111 In-oxine labeled granulocytes was 39.6%± 8.0% and 60.6%± 17.6% (mean ± SD) respectively. The mean in vitro elution of the radiolabel ranged from 8.7-14.0% for the 99m Tc-HMPAO grannulocytes and from 6.1-9.0% for the 111 In-oxine granulocytes. Mean cell viability, for the 99m Tc-HMPAO, 111 In-oxine and non-radiolabeled control granulocytes ranged from 97.8-99.4%, 96.4-98.5% and 98.2-99.0%, respectively. The phagocytic ability of the 99m Tc-HMPAO, 111 In-oxine and control granulocytes ranged from 47.5-54.1%, 38.9-56.2% and 46.6-57.8% respectively over the six hour study period. Although labeling efficiency using 111 In-oxine was significantly (P=0.05) better than 99m Tc-HMPAO, there was no significant difference in label retention of the two radiolabels. There was no significant difference in viability or phagocytic function during the six hour study period. Considering the potential cost advantage and the superior imaging qualities of Technetium-99m relative to Indium-111, 99m Tc-HMPAO appears to be a good alternative to 111 In-oxine as a granulocyte label. 相似文献
10.
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
11.
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
12.
J. Turrel B. Burke S. Ullman M. McEntee R. Page 《Veterinary and comparative oncology》2005,3(1):52-53
Introduction: Greater than 50% of dogs with thyroid tumors present with surgically unresectable disease for which external beam radiotherapy has been reported to prolong survival. The success of 131 I for control of thyroid tumors in cats and in humans suggests such therapy may also play a role in the management of canine thyroid cancer.
Methods: Thirty‐nine dogs with WHO stage II/III (invasive or ectopic; n = 32) or IV (metastatic; n = 7) thyroid tumors were treated with131 I alone. Changes in thyroid function, 99M Tc‐pertechnetate (99M Tc) scintigraphic changes, and tumor response were recorded. Dogs with ventral cervical tumors were evaluated for feasibility of surgical resection following 131 I.
Results: Median overall survival was 839 days and 366 days for dogs with stage II/III and stage IV tumors, respectively. Thyroid hormone status, site and surgical resection were not associated with outcome in dogs with stage II/III tumors. Three dogs developed severe bone marrow suppression.
Conclusions: These findings suggest131 I should be investigated more thoroughly in dogs with thyroid tumors not considered surgical candidates to more clearly characterize the indications for therapy and followup recommendations. 131 I dosimetry in dogs with thyroid tumors remains problematic. Administration of 131 I is currently based on empiric recommendations and, in general, the treatment is well tolerated although additional studies are indicated to optimize response and minimize toxicity. 相似文献
Methods: Thirty‐nine dogs with WHO stage II/III (invasive or ectopic; n = 32) or IV (metastatic; n = 7) thyroid tumors were treated with
Results: Median overall survival was 839 days and 366 days for dogs with stage II/III and stage IV tumors, respectively. Thyroid hormone status, site and surgical resection were not associated with outcome in dogs with stage II/III tumors. Three dogs developed severe bone marrow suppression.
Conclusions: These findings suggest
13.
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
14.
AMY K. LEBLANC JON S. WALL FEDERICA MORANDI STEPHEN J. KENNEl ALAN STUCKEY BJOERN JAKOBY DAVID W. TOWNSEND GREGORY B. DANIEL 《Veterinary radiology & ultrasound》2009,50(4):436-441
Positron emission tomography (PET) with 2-deoxy-2-[18 F]fluoro- d -glucose (18 FDG) is an important imaging modality for diagnosis and staging of human neoplastic disease. The purpose of this study is to describe the normal 18 FDG uptake in adult cats. Six adult healthy female cats were used. Cats were sedated and then injected intravenously with 74.0±13.0 (mean±SD) MBq of 18 FDG. General anesthesia was induced and cats were placed in ventral recumbancy on the PET scanner's bed. Static images using multiple bed positions were acquired approximately 60–90 min after injection. A transmission scan was acquired at each bed position utilizing a 57 Co point source to perform attenuation and scatter correction. Regions of interest (ROIs) were drawn over the liver, right and left renal cortices, left ventricular wall, and wall of ascending and descending colonic segments. Standardized uptake values (SUV) were calculated using an established formula. Kidneys and intestinal tract had relatively intense uptake of 18 FDG; liver activity was intermediate; the spleen was not identified in any of the cats. Cardiac activity was variable but intense activity was noted in the left ventricular myocardium in most cats. No appreciable lung uptake was noted. Mean±SD SUV values were calculated. This study established the normal pattern of uptake of 18 FDG in adult cats and provided baseline data for comparison with future studies evaluating a variety of neoplastic and nonneoplastic diseases. 相似文献
15.
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
16.
MOHAMED H. ABUSHHIWA NOURIA S. SALEHI ROBERT C. WHITTON JENNIFER A. CHARLES PETER J. FINNIN PETER M. LORDING BRUCE W. PARRY 《Veterinary radiology & ultrasound》2009,50(5):545-549
Technetium-99m stannous colloid (99m TcSnC) has been used to radiolabel human leukocytes to investigate various inflammatory disorders. We investigated the in vitro behavior of feline leukocytes labeled in whole blood with 99m TcSnC. Heparinized blood samples were collected from healthy cats and divided into control and test aliquots. The latter were labeled with 99m TcSnC using a standard procedure. Leukocyte viability was determined for each sample using a trypan blue exclusion test. Labeling efficiency was determined for test aliquots. Test aliquots were layered onto Histopaque-1077® and centrifuged before measurement of radioactivity of the blood components. Leukocytes from radiolabeled and control samples were washed and incubated with opsonized zymosan particles to allow assessment of phagocytic function. Aliquots were taken from radiolabeled feline leukocyte samples at 1, 3, 4, and 7 h postlabelling. After centrifugation of each aliquot, radioactivity of the supernatant and pellet was measured and the labeling retention determined. Leukocyte viability in both radiolabeled and control samples was >98%. The labeling efficiency was 95.2±0.14%. The distribution of radioactivity in feline blood was found to be 3.4±0.18% in plasma, 39.0±0.37% in erythrocytes, and 57.6±0.38% in leukocytes. Labeled feline leukocytes had phagocytic activity of 90.9±0.18% (control 91.3±0.15%). The radiolabeled leukocytes retained 93.4±0.19% of the radioactivity up to 7 h postlabeling. 99m TcSnC efficiently labeled feline leukocytes with no effect on viability and minimal effect on phagocytic function. The percentage retention of radioactivity by the leukocytes was still high at 7 h postlabeling. 相似文献
17.
Marion D. Francis Candice L. Slough Hugh E. Black Andrew J. Tofe G. Gilbert Cloyd 《Veterinary radiology & ultrasound》1980,21(4):168-176
The following sequence of treatments was administered to a Saint Bernard dog with a primary distal right radius osteosarcoma: 54 days of daily disodium 1-hydroxyethylidenediphosphonate (HEDP) subcutaneous injections; 53 days of HEDP per os ; one 32 P-HEDP intravenous injection. During the pretreatment period, there was an extensive increase in calcific tumor growth and osteoblastic proliferation. After the subcutaneous HEDP treatment, almost complete tumor necrosis was seen. After the oral HEDP treatment, only the deepest tumor portion contained active osteoblasts, calcific growth of the tumor was completely blocked, and uptake of 99m Tc-Sn-HEDP was reduced to one fourth of the pretreatment uptake. After a single 32 P-HEDP dose, large areas of tumor necrosis were evident histopathologically. However, subsequent resumption of cellular activity occurred in the tumor, and the uptake of 99m Tc-Sn-HEDP increased to pretreatment values. These data suggest that systemically administered HEDP should be studied further for its possible therapeutic potential in the treatment of osteosarcoma and indicate a need for further study of 32 P-HEDP or possibly 33 P-HEDP. 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.
Anthony J. Fischetti Wm Tod Drost Stephen P. DiBartola Dennis J. Chew Patricia A. Schenck Cheyney Meadows 《Veterinary radiology & ultrasound》2005,46(3):267-272
Nineteen cats with abnormally high serum T4 concentrations underwent thyroid scintigraphy using technetium-99m pertechnetate (99mTcO4) before and after 36 +/- 6 days of methimazole administration (approximately 2.5mg PO q 12 h). Thyroid-to-salivary gland ratios (T:S ratios) and percentage thyroidal uptake of injected radioactivity at 20 and 60min after injection of 99mTcO4 were compared before and after methimazole treatment. Serum thyroid stimulating hormone (TSH) concentration was measured before and after methimazole treatment. Quantitatively, there was a positive association between the thyroid uptake of 99mTcO4 and the serum T4 before treatment (r = 0.74-0.83). TSH suppression was present when cats were first evaluated for hyperthyroidism. Methimazole treatment did not relieve TSH suppression in 17 cats. Two cats with unilateral thyroid uptake developed bilateral, asymmetric thyroid uptake of 99mTcO4 after treatment and had the greatest increase in TSH concentration after treatment. Quantitatively, thyroid scintigraphy did not significantly change after methimazole treatment (P>0.1). Evaluation of serum TSH concentration may be helpful in identifying methimazole-induced changes in the scintigraphic features of hyperthyroidism in mildly hyperthyroid cats. 相似文献
20.
EVALUATION OF RENAL HEMODYNAMICS IN AWAKE AND ISOFLURANE-ANESTHETIZED CATS WITH PULSED-WAVE DOPPLER AND QUANTITATIVE RENAL SCINTIGRAPHY 总被引:2,自引:1,他引:1
Sally K. Mitchell DVM Robert L. Toal DVM MS Gregory B. Daniel DVM MS Barton W. Rohrbach VMD MPH 《Veterinary radiology & ultrasound》1998,39(5):451-458
The feasibility and reproducibility of obtaining the pulsed-wave Doppler measurements of resistive index (RI) and pulsatility index (PI) were investigated in intrarenal arteries of normal, nonsedated cats, and cats anesthetized with isoflurane. In addition, relative renal function and relative renal blood flow were evaluated using quantitative renal scintigraphy. The percentage of injected dose uptake, time to peak activity, and two indices of renal blood flow (K/A ratio and flow index) obtained during the first pass of 99m Tc-MAG3 , were determined for both awake and anesthetized cats. Results indicate that measuring RI and PI in nonsedated cats is readily accomplished and that the results are reproducible within an animal. Mean RI and PI values in the awake cats were 0.55 and 0.8, respectively. Significant differences between the awake and anesthetized cats were found for all pulsed-wave Doppler and quantitative renal scintigraphic measurements evaluated. 相似文献