Lymphoscintigraphy of the Lower Extremities: Discrepancies Between Superficial and Deep Lymphatic Systems.

ABSTRACT: We describe a 57-year-old man with prostate cancer. A radical prostatectomy with a pelvic lymphadenectomy was performed. After 2 years, a mild swelling of the lower extremities appeared, and the patient was referred for lower-limb lymphoscintigraphy. A lymphoscintigraphy of the superficial lymphatic system in the limbs showed prominent, dermal backflow in the area of the right hypogastrium. Lymphoscintigraphy of the deep lymphatic system showed reflux in the left hypogastrium. This discrepancy between the findings in the superficial and deep lower-limb lymphatic systems was explained by asymmetric sampling of the lymph nodes during the lymphadenectomy.

Primary Congenital Lymphedema.

We present the case of a 26-year-old man with congenital primary lymphedema. A lymphedema of the right upper limb appeared at the age of 2 years, followed by edemas of the right lower limb and of the right part of the head and neck. A lymphedema of the left lower limb began 5 years ago, and finally an edema of the external genitalia began 2 years ago. Lymphoscintigraphy of the lower limbs and pelvic/abdominal region (including SPECT/ldCT) revealed interesting abnormalities.

Diffusion-weighted magnetic resonance imaging is more sensitive than dimercaptosuccinic acid scintigraphy in detecting parenchymal lesions in children with acute pyelonephritis: A prospective study.

INTRODUCTION: Static renal scintigraphy is the gold standard for detection of inflammatory changes in the renal parenchyma in acute pyelonephritis. Our aim was to determine whether diffusion-weighted magnetic resonance imaging (DW-MRI) was comparable with static renal scintigraphy (DMSA-SRS) to demonstrate acute renal parenchymal lesions. OBJECTIVE: To compare 99mTc-dimercaptosuccinic acid static renal scintigraphy (DMSA-SRS) with diffusion-weighted magnetic resonance imaging (DW-MRI) for detecting acute inflammatory changes in the renal parenchyma in children with febrile urinary tract infection. METHODS: Thirty-one children (30 girls) aged 3-18 years with a first episode of febrile UTI without a previously detected congenital malformation of the urinary tract, were prospectively included. DMSA-SRS and DW-MRI were performed within 5 days of diagnosis to detect renal inflammatory lesions. The DW-MRI examination was performed without contrast agent and without general anesthesia. Late examinations were performed after 6 months using both methods to detect late lesions. RESULTS: DW-MRI confirmed acute inflammatory changes of the renal parenchyma in all 31 patients (100%), mostly unilateral. DMSA-SRS detected inflammatory lesions in 22 children (71%; p = 0.002). The lesions were multiple in 26/31 children (84%) on DW-MRI and in 9/22 (40%) on DMSA-SRS. At the control examination, scarring of the renal parenchyma was found equally by DW-MRI and DMSA-SRS in five patients (16%), three of whom were the same patients. The overall concordance of positive and negative late findings occurred in 87% of patients. There was correspondence in the anatomical location of acute and late lesions. DISCUSSION: The clinical significance of acute and late parenchymal findings on DWI-MR is yet to be determined. A limitation of our study is the age of the patients (older than 3 years) who are less sensitive to scar development; therefore, a smaller number of patients with scars could be analyzed during control examination. Further studies using the DW-MRI should confirm its reliability to detect acute and late lesions in younger children and infants and determine the clinical consequences. CONCLUSION: DW-MRI has higher sensitivity for detecting acute renal inflammatory lesions and multifocal lesions than DMSA-SRS. The incidence of scars was low and corresponded with the anatomical location of acute and late lesions.

J-pouch versus Roux-en-Y reconstruction after gastrectomy: functional assessment and quality of life (randomized trial).

PURPOSE: The aim of this study was to evaluate the quality of life and functional emptying of J-pouch versus Roux-en-Y reconstruction after total gastrectomy for malignancy. METHODS: This study was designed as a prospective, nonblinded, randomized, parallel clinical trial (Trial Number: MN Ostrava, 200604). With informed consent, patients undergoing gastrectomy for malignancy were randomized to J-pouch or Roux-en-Y reconstruction. The time taken for a test semisolid meal labeled with 99mTc-sulfur colloid to exit the reconstructed parts was measured by dynamic scintigraphy 1 year after resection. Quality of life was measured using the Eypasch questionnaire at the same time as functional emptying assessment. This trial was investigator-initiated. RESULTS: In all, 72 patients were included into the study. The time taken for the test meal to exit the postgastrectomy reconstruction was 16.5±10.0 minutes (mean ± standard deviation) in the Roux-en-Y group and 89.4±37.8 minutes in the "J-pouch" group; the difference was statistically significant (P<0.001). Emptying of the J-pouch appeared to be a linear decreasing function compared to the exponential pattern seen in the Roux-en-Y group. The quality of life measurement showed scores of 106±18.8 points (mean ± standard deviation) in the Roux-en-Y group compared to 122±22.5 points in the J-pouch group; the difference was statistically significant (P=0.0016). There were no important adverse events. CONCLUSION: After total gastrectomy, a J-pouch reconstruction empties more slowly and is associated with higher quality of life compared to Roux-en-Y reconstruction. Whether these two observations have a direct causative link remains unanswered.

Functional compared to anatomical imaging in the initial evaluation of patients with suspected coronary artery disease: An international, multi-center, randomized controlled trial (IAEA-SPECT/CTA study).

OBJECTIVE: To test the hypothesis that, in the initial evaluation of patients with suspected coronary artery disease (CAD), stress myocardial perfusion imaging (MPI) would result in less downstream testing than coronary computed tomographic angiography (CCTA). METHODS: In this international, randomized trial, mildly symptomatic patients with an intermediate likelihood of having CAD, and asymptomatic patients at intermediate risk of cardiac events, underwent either initial stress-rest MPI or CCTA. The primary outcome was downstream noninvasive or invasive testing at 6 months. Secondary outcomes included cumulative effective radiation dose (ERD) and costs at 12 months. RESULTS: We recruited 303 patients (151 MPI and 152 CTA) from 6 centers in 6 countries. The initial MPI was abnormal in 29% (41/143) and CCTA in 56% (79/141) of patients. Fewer patients undergoing initial stress-rest MPI had further downstream testing at 6 months (adjusted OR 0.51, 95% CI 0.28-0.91, P = 0.023). There was a small increase in the median cumulative ERD with MPI (9.6 vs. 8.8 mSv, P = 0.04), but no difference in costs between the two strategies at 12 months. CONCLUSION: In the management of patients with suspected CAD, a strategy of initial stress MPI is substantially less likely to require further downstream testing than initial testing with CCTA. TRIAL REGISTRATION: clinicaltrials.gov identification number NCT01368770.

Radionuclide cholescintigraphy in genetically confirmed Rotor syndrome.

A 7-year-old girl had been followed up for persistent conjugated hyperbilirubinemia since birth. Alanine aminotransferase, aspartate aminotransferase and γ-glutamyl transpeptidase activity was within the normal range, and liver protein synthesis had always been normal. Infectious etiology of jaundice, autoimmune diseases, drug-induced liver injury, hemolytic anemia, α-1 anti-trypsin deficiency, Wilson disease and Gilbert syndrome were ruled out. At the age of 8 years the patient underwent radionuclide dynamic cholescintigraphy, indicating poor accumulation of the radiotracer in the liver on one hand, and severe retention of the radiopharmaceutical in the blood pool (including the heart) on the other hand. Rotor syndrome was suspected and finally confirmed on molecular analysis. This case represents the first cholescintigraphy report in a pediatric patient with genetically proven Rotor syndrome.

Modified PISAPED Criteria in Combination with Ventilation Scintigraphic Finding for Predicting Acute Pulmonary Embolism.

This prospective clinical study aimed at assessing three pulmonary scintigraphic algorithms to detect acute pulmonary embolism (PE): Lung ventilation/perfusion (V/Q) scintigraphy along with modified prospective investigation of pulmonary embolism diagnosis (PIOPED) criteria; lung perfusion scintigraphy along with prospective investigative study of acute pulmonary embolism diagnosis (PISAPED) criteria; and lung perfusion scan in combination with ventilation scan, along with modified PISAPED criteria, which were newly developed. Patients with suspicion of PE were eligible for this study if they had no abnormal chest x-ray. Their diagnostic workup included a clinical assessment, a pulmonary V/Q scintigraphy, and CT pulmonary angiography (CTPA), as well as a clinical outcome assessment over a period of 24 weeks. Referred to the final clinical diagnosis of patients, the sensitivity and specificity of each algorithm were evaluated. The diagnostic performance of each algorithm by the area under the maximum likelihood fitted receiver operating characteristic (ROC) curve was determined. With respect to the PISAPED criteria, the sensitivity was 60.8% and specificity was 87.3%. No patient was classified into nondiagnostic category. The PIOPED criteria showed that the sensitivity was 95.0% and specificity was 88.2%, while 57.4% of the patients were in nondiagnostic category. The areas under the ROC curve constructed from the PISAPED criteria results and the modified PIOPED criteria results were 0.734 and 0.859 (P < 0.01), respectively. The modified PISAPED criteria demonstrated that the sensitivity was 83.8% and specificity was 89.1%. No patient was classified into nondiagnostic category. The area under the ROC curve constructed from modified PISAPED criteria was 0.864 (P < 0.01). Perfusion scans used with ventilation scans and modified PISAPED criteria may increase the diagnostic accuracy of pulmonary scintigraphy for acute PE, compared with the two major algorithms.

Myocardial perfusion imaging parameters: IQ-SPECT and conventional SPET system comparison.

Technological advancement in hardware and software development in myocardial perfusion imaging (MPI) leads to the shortening of acquisition time and reduction of the radiation burden to patients. We compared semiquantitative perfusion results and functional parameters of the left ventricle between new dedicated cardiac system with astigmatic collimators called IQ-SPECT (Siemens Medical Solutions, USA) and conventional single photon emission tomography (SPET) system equipped with standard low energy high resolution collimators. A group of randomly selected 81 patients underwent consecutively the MPI procedure on IQ-SPECT and on conventional SPET systen, both without attenuation correction. The summed scores and the values of the functional parameters of the left ventricle: ejection fraction (EF), end-systolic and end-diastolic volumes (ESV, EDV) received from the automatic analysis software were compared and statistically analyzed. Our results showed that summed scores values were significantly higher for the IQ-SPECT system in comparison to the conventional one. Calculated EF were significantly lower for IQ-SPECT, whereas evaluated left ventricular volumes (LVV) were significantly higher for this system. In conclusion, we recorded significant differences in automatically calculated semiquantitative perfusion and functional parameters when compared uncorrected studies obtained by the IQ-SPECT with the conventional SPET system.

Transcranial sonography and (123)I-FP-CIT single photon emission computed tomography in movement disorders.

Diagnosis of Parkinson's disease (PD) can be difficult in the early stages of the disease. The aim of the study described here was to assess the correlation between transcranial sonography (TCS) and (123)I-FP-CIT ([(123)I]ioflupane, N-ω-fluoropropyl-2ß-carbomethoxy-3ß-(4-[(123)I]iodophenyl)nortropane) SPECT (single photon emission computed tomography) findings and the diagnosis of PD. A total of 49 patients were enrolled in the study: 29 patients with PD, 7 patients with other parkinsonian syndromes, 11 patients with essential tremor and 2 with psychogenic movement disorder. Substantia nigra echogenicity was measured using TCS. SPECT was performed using DaTSCAN ([(123)I]ioflupane). TCS and SPECT findings were correlated in 84% of patients, with κ = 0.62 (95% confidence interval: 0.38-0.86). TCS-measured substantia nigra echogenicity and SPECT-measured striatal binding ratio were negatively correlated (r = -0.326, p = 0.003). TCS/SPECT sensitivity, specificity and positive and negative predictive values for the diagnosis of PD were 89.7%/96.6%, 60.0%/70.0%, 76.5%/82.4% and 80.0%/93.3%, respectively. Both positive TCS and SPECT findings correlated significantly with the diagnosis of PD (κ = 0.52, 95% confidence interval: 0.27-0.76, and κ = 0.69, 95% confidence interval: 0.49-0.90, respectively).

Sentinel lymph nodes and planar scintigraphy and SPECT/CT in various types of tumours. Estimation of some factors influencing detection success.

BACKGROUND: Aim ot the study was to assess the role of planar lymphoscintigraphy and fusion imaging of SPECT/CT in sentinel lymph node (SLN) detection in patients with various types of tumours and to estimate some factors influencing detection success - age and body mass index. MATERIAL AND METHODS: Planar scintigraphy and hybrid modality SPECT/CT were performed in 550 consecutive patients (mean age 58.1 ± 13.1 years): 69 pts with gynaecological tumours (37 pts with cervical cancer, 25 pts with endometrial cancer, 7 pts with vulvar carcinoma; mean age 54.4 ± 13.2 years), 161 consecutive patients with melanomas (mean age 57.1 ± 14.8 years), and 320 consecutive women with breast cancer (mean age 59.4 ± 12.0 years). The radiopharmaceutical was injected around the tumour (gynaecologic and breast cancers, melanomas), subareolarly (in some breast cancers), or around the scar (in melanomas after their removal). Planar and SPECT/CT images were interpreted separately by two nuclear medicine physicians. RESULTS: Planar scintigraphy did not show SLN in 77 patients (14.0%): in 8 pts with gynaecologic tumours, in 23 pts with melanomas and in 46 pts with breast cancer. SPECT/CT was negative in 49 patients (8.9%): in 4 pts with gynaecologic tumours, in 12 pts with melanomas and in 33 pts with breast cancer. In 199 (36.2%) patients the number of SLNs captured on SPECT/CT was higher than on planar imaging. 35 foci of uptake (3.1% from totally visible 1134 foci on planar images) interpreted on planar images as hot LNs were found to be false positive non-nodal sites of uptake when further assessed on SPECT/CT. SPECT/CT showed the exact anatomical location of all visualized sentinel nodes. Influence of the age and BMI: The group of patients with higher number of detected SLN on SPECT/CT than on planar scintigraphy had lower average age than the group of patients with the same number of detected SLN on SPECT/CT and on planar scintigraphy, the difference was statistically significant (P=0.008). BMI did not differ between the two groups. CONCLUSION: In some patients with gynaecologic and breast cancers and melanomas, SPECT/CT improves detection of sentinel lymph nodes. It can image nodes not visible on planar scintigrams, exclude false positive uptake and exactly localize axillary, inguinal, pelvic and paraaortic SLNs. It improves anatomical localization of SLNs. We have found the influence of the age on the difference in the number of SLNs detected by the fusion of SPECT/CT and planar lymphoscintigraphy. On the other hand, this difference was not influenced by BMI.

What is the risk for parametrial involvement in women with early-stage cervical cancer with tumour <20 mm and with negative sentinel lymph nodes?

AIMS: To evaluate the incidence of parametrial involvement in women with early-stage cervical cancer with tumour <20 mm and with negative sentinel lymph nodes (SLN). METHODS: We reviewed the cases of all women who underwent radical hysterectomy and pelvic lymphadenectomy with SLN biopsy for invasive cervical cancer between April 2004 and December 2009. Parametrial involvement was defined as direct extension, nodal disease or spread through vascular channels. RESULTS: From the 204 women who underwent radical surgery with SLN biopsy, 63 (FIGO stage IA2-10, IB1-53) met the inclusion criteria: tumour <20 mm in the largest diameter regardless of the depth of stromal invasion (less or more than half stromal invasion) and negative sentinel lymph nodes. Median age was 44.3 years (range 24-72). Lymph-vascular space invasion was present in 25 women. The histology identified squamous carcinoma in 50 women, adenocarcinoma in 11 women and adenosquamous carcinoma in two women. Tumour grade 1 occurred in 41, grade 2 in 16 and grade 3 in 6 of the cases. No parametrial involvement was observed. The false negative rate of SLN biopsy was 0%. CONCLUSION: No parametrial involvement was observed in women with early-stage cervical cancer with tumour <20 mm in diameter and negative sentinel lymph nodes regardless of the presence of lymph-vascular space invasion, histology subtype and grade of the tumour. Radical removal of the parametrium in this low-risk group is questionable.

Localisation of sentinel lymph nodes in patients with melanomas by planar lymphoscintigraphic and hybrid SPECT/CT imaging.

BACKGROUND: The aim of the study was to assess the role of planar lymphoscintigraphy and fusion imaging of SPECT/CT in sentinel lymph node (SLN) identification in patients with melanomas. MATERIAL AND METHODS: Planar and hybrid SPECT/low-dose CT lymphoscintigraphy were performed in 113 consecutive patients with melanomas (59 men, 54 women, mean age 57.6 with range 11-87 years, BMI 29.4 ± 12.5). The radiopharmaceutical was injected around the tumour (Group A, 59 patients), or around the scar (Group B, 54 patients). Localisation of melanomas: head and neck 4, trunk 55, upper extremities 28, lower extremities 26. Planar and SPECT/CT images were interpreted separately by two nuclear medicine physicians. Abilities of these two techniques to image SLN were compared. RESULTS: SLNs were detected on lymphoscintigraphy comprising planar and SPECT-CT images in 108 (95.6%) study patients; there was failure to detect SLNs in the remaining 5 (4.4%) patients. Planar images identified 253 SLNs in 100 (88.5%) pts, with a mean of 2.2 ± 1.7 (range 0-9 nodes) per patient. In the remaining 13 (11.5%) patients no SLNs were detected on planar images. On SPECT-CT images, 334 hot nodes were detected in 107 (94.7%) patients with a mean of 3.0 ± 2.1 (range 0-9) nodes per patient. In the remaining 6 (5.3%) patients, SPECT-CT was negative. SPECT/CT visualised lymphatic drainage in 8 (7.1%) patients with non-visualisation on planar imaging. CONCLUSIONS: In some patients with melanomas SPECT/CT improves detection of sentinel lymph nodes. It can image nodes not visible on planar scintigrams, exclude false positive uptake and exactly localize SLNs.

Detection of Sentinel Lymph Nodes in Gynecologic Tumours by Planar Scintigraphy and SPECT/CT.

OBJECTIVE: Assess the role of planar lymphoscintigraphy and fusion imaging of SPECT/CT in sentinel lymph node (SLN) detection in patients with gynecologic tumours. MATERIAL AND METHODS: Planar scintigraphy and hybrid modality SPECT/CT were performed in 64 consecutive women with gynecologic tumours (mean age 53.6 with range 30-77 years): 36 pts with cervical cancer (Group A), 21 pts with endometrial cancer (Group B), 7 pts with vulvar carcinoma (Group C). Planar and SPECT/CT images were interpreted separately by two nuclear medicine physicians. Efficacy of these two techniques to image SLN were compared. RESULTS: Planar scintigraphy did not image SLN in 7 patients (10.9%), SPECT/CT was negative in 4 patients (6.3%). In 35 (54.7%) patients the number of SLNs captured on SPECT/CT was higher than on planar imaging. Differences in detection of SLN between planar and SPECT/CT imaging in the group of all 64 patients are statistically significant (p<0.05). Three foci of uptake (1.7% from totally visible 177 foci on planar images) in 2 patients interpreted on planar images as hot LNs were found to be false positive non-nodal sites of uptake when further assessed on SPECT/CT. SPECT/CT showed the exact anatomical location of all visualised sentinel nodes. CONCLUSION: In some patients with gynecologic cancers SPECT/CT improves detection of sentinel lymph nodes. It can image nodes not visible on planar scintigrams, exclude false positive uptake and exactly localise pelvic and paraaortal SLNs. It improves anatomic localization of SLNs. CONFLICT OF INTEREST: None declared.

Effectiveness of radiosynoviorthesis in the treatment of chronic synovitis of small and middle-sized joints affected by rheumatoid arthritis.

Our aim was to describe and evaluate our experience in the treatment of radiosynoviorthesis (RSO) of small and middle-sized joints in patients with rheumatoid arthritis (RA). Eighty six patients with RA enrolled in the study. The criterion for enrolment was destructive process of the joint detected by X-rays and classified as a stage II-III according to Larsen. Seventy-six middle-sized joints were treated each with 74MBq or rhenium-186 sulphate and other 80 small joints with 10-40MBq of erbium-169 citrate each. The effect of treatment was evaluated at 6 and 12 months following the RSO treatment. The obtained values were compared with those of the initial state. The inflammatory and structural changes in activity were assessed according to the results of ultrasound examination, regression of pain, swelling of the joint and the improvement in mobility. The data obtained were statistically processed with the Chi-square test. Our results showed that RSO significantly decreased pain of the affected joints, however the influence upon joint motion was minimal. The best treatment results were observed in shoulders and elbows, while the ankles were the worst to respond to the RSO treatment. The significant (P<0.05) beneficial effect of the RSO treatment on pain and swelling reduction were only transient started on 1 week to 1 month and declined over 12 months. In conclusion, our study showed that RSO is a suitable alternative in the treatment of chronic synovitis, with a low potential of adverse effects. However the beneficial effect on pain and swelling reduction was only transient and declined over 12 months.

I-131 false positive uptake in a huge parapelvic renal cyst.

A male patient had undergone total thyroidectomy for thyroid papillary carcinoma. He was administered thyroablation activity of radioiodine. Whole body imaging after diagnostic activity of 131-I demonstrated intense radioiodine uptake in the right side of the upper abdominal region. The serum thyroglobulin level was low. Ultrasonography demonstrated a large irregular anechoic structure in the centre of the right kidney--a cyst in the parapelvic region. Renal cysts can lead to erroneous interpretation of radioiodine scintigraphy.

Moyamoya disease is associated with endothelial activity detected by anti-nestin antibody.

AIM: To describe the case history and new histopathological findings of a young woman suffering from moyamoya disease. METHODS: The patient underwent brain computed tomography, magnetic resonance imaging and brain angiography. Vessel samples of a. temporalis superficialis were processed by standard histopathological and immunohistochemical methods by analysis of VEGF, VEGFR and nestin expression. RESULTS: Brain angiography revealed both internal carotid artery stenoses and stenoses of the anterior cerebral arteries. Stenotic parts of vessels were accompanied by coiled and elongated vessels with a picture of "smoke puffs carried away by breeze" after contrast medium application. Histological examination showed: obstruction of lumen, fibrocellular intimal thickening, tortuosity and disruption of internal elastic lamina. Imunohistochemistry confirmed a defect of the internal elastic membrane of the muscular arteria and progressive intimal thickening accompanied by abnormal smooth muscle cells and, VEGF/VEGFR expression in intima. Nestin positivity in endothelium of arteria indicated that endothelial cells are activated. CONCLUSION: We found that the endothelium of affected vessels is nestin positive. This, together with the finding of VEGF/VEGFR expression, might suggest an active angiogenetic process We present a new conception of pathogenesis but further studies with higher number of patients are necessary to elucidate the role of these growth factors in the moyamoya disease.

Characteristics of sentinel lymph nodes' metastatic involvement in early stage of vulvar cancer.

BACKGROUND: Nodal involvement is one of the most significant prognostic factors in early-stage vulvar cancer. AIMS: To determine the diagnostic accuracy of sentinel lymph node (SLN) detection in early-stage vulvar cancer and to describe the characteristics of metastatic lymph node involvement. METHODS: Of 23 women with early-stage squamous cell vulvar cancer included in the study, five had lateral lesions and 18 had midline lesions. SLN detection was performed by using a radioactive tracer and blue dye, followed by radical vulvectomy or radical wide excision with uni/bilateral inguinofemoral lymphadenectomy, depending on tumour size and localization. SLNs were subsequently examined with haematoxylin-eosin and immunohistochemistry. RESULTS: The SLN detection was successful in all 23 women (100%) and in 38 of 41 groins (92.3%) tested. The total number of SLNs was 67, with an average of 1.76 per groin. In total, 20 positive SLNs were detected in 14 of 23 patients. From a total of 20 positive SLNs, micrometastases were found in five SLNs and isolated tumour cells in one SLN. We experienced one case with a false negativity of SLN. Sensitivity, negative predictive value, accuracy and false negativity of SLN detection were 93.3%, 88.8%, 95.6% and 7.1% respectively. CONCLUSION: The SLN biopsy performed by an experienced team is a feasible method, with high accuracy in patients with early-stage vulvar cancer. Prognostic value of micrometastases should be confirmed in further studies.

123 I-mIBG scintigraphy to predict inducibility of ventricular arrhythmias on cardiac electrophysiology testing: a prospective multicenter pilot study.

BACKGROUND: Disturbances of autonomic function after infarction are associated with both total mortality and sudden death. Although many imaging techniques for assessing the cardiac autonomic nervous system have been studied, the clinical usefulness of these techniques remains uncertain. This exploratory pilot study examined the relationship between abnormalities of ventricular sympathetic innervation delineated by scintigraphic imaging with (123)I-mIBG and inducible ventricular tachyarrhythmias in patients with left ventricular dysfunction and previous myocardial infarction. METHODS AND RESULTS: Fifty patients underwent electrophysiological (EP) testing and 15-minute and 4-hour planar and single photon emission computed tomography (SPECT) imaging with (123)I-mIBG and SPECT imaging with (99m)Tc-tetrofosmin. The primary efficacy variables were the 4-hour heart:mediastinum ratio (H/M) and the (123)I-mIBG/(99m)Tc-tetrofosmin SPECT mismatch score. EP studies were categorized as positive (EP(+)) or negative (EP(-)) for inducibility of sustained (>30 seconds) ventricular tachyarrhythmias. Thirty patients were EP(+), and 20 were EP(-). There were no significant differences in the 4-hour H/M ratios or (123)I-mIBG/(99m)Tc-tetrofosmin SPECT mismatch scores between the two groups. In a multivariable analysis using all (123)I-mIBG and (99m)Tc-tetrofosmin SPECT measurements, the only variable that showed a significant difference between EP(+) and EP(-) patients was the 4-hour (123)I-mIBG SPECT defect score. A 4-hour (123)I-mIBG SPECT defect score of > or =37 yielded a sensitivity of 77% and specificity of 75% for predicting EP results. CONCLUSIONS: The standard indices of (123)I-mIBG imaging (H/M and innervation-perfusion mismatch score) are not predictive of EP test results. The association of (123)I-mIBG SPECT defect severity with EP test inducibility in this exploratory study will require confirmation in a larger cohort of patients.

Functional autonomies of thyroid and efficacy of radioiodine therapy.

In this paper, the authors present their experience with the radioiodine therapy of thyroid functional autonomies. The aims of this study were to establish the efficacy and determine the adverse effects of radioiodine therapy of patients with thyroid functional autonomies. Over a period of 31 years (from 1974 to 2005) 868 patients (766 women, 102 men with the age from 33 to 86 years; average age, 58.5) with unifocal functional autonomy, multifocal functional autonomy, and disseminated functional autonomy, received at least one treatment of radioiodine in our Department of Nuclear Medicine. For diagnostics and the evaluation of the radioiodine therapeutic effect of functional autonomies, a thyroid scintigraphy is the basic and necessary procedure. We have also performed a thyroid ultrasonography, an assessment of a serum level of a total and free thyroxine, total tri-iodothyronine, thyroid-stimulating hormone (TSH), the radioiodine accumulation test, the estimation of the radioiodine effective half-life, and in some patients, thyrotrophin-releasing hormone (TRH)-TSH test. The follow-up examinations were done in all patients after 4-6 months, another examination after 1 year in 585 patients, and after 2 years in 284 patients. One therapeutic dose received 798 patients (91.9%) and it was sufficient for an elimination of functional autonomies. Some patients were retreated if there was the evidence of small or no treatment effect and no elimination of functional autonomies. Sixty-six (66) patients (7.6%) received two radioiodine treatments and 4 patients (0.5%) three treatments. Before radioiodine therapy, an average serum level of total thyroxine was 165.8 nmol/L, of free thyroxine 21.2 pmol/L, and of total triiodothyronine 3.3 nmol/L, and in all patients, TSH was suppressed. Before therapy, patient complaints were cardiovascular in 87%, neurological in 72%, hypermetabolic in 70%, and local in 31% of patients. After therapy, the average serum levels of total thyroxine were 110.9 nmol/L, free thyroxine 12.7 pmol/L, and total triiodothyronine 2.1 nmol/L with an improvement of symptoms in 91.5% of patients, no improvement in 8.2% and a worsening in 0.3% of patients. The suppression of TSH disappeared in 668 of treated patients (77%). An average volume reduction of thyroid of 40% was achieved in any type of functional autonomy after radioiodine treatment. Side-effects were minimal, and in some patients, presented as a transient neck pressure or pain and neck swelling. Postradiation hypothyroidism was diagnosed in 38 patients (4.4%). The results of this study show that the radioiodine therapy of the thyroid functional autonomies is safe, with a low incidence of adverse effects. It is effective, and for patients, is a nondemanding procedure.