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J T Fairbank

Publications and source records attributed to J T Fairbank.

10 recordsLinked to original sources
PubMed1999

Effect of short-term hormone replacement therapy on left ventricular mass and contractile function.

OBJECTIVE: To determine the effect of hormone replacement therapy (HRT) on cardiac structure and function and whether these changes are related to changes in blood volume. DESIGN: Open-label pilot study. SETTING: Academic medical center. PATIENT(S): Eighteen healthy postmenopausal women. INTERVENTION(S): We administered medroxyprogesterone acetate orally, 5 mg/d for 2 months followed by 2 months of oral sequential 17beta-estradiol, 1 mg/d plus medroxyprogesterone acetate, 10 mg/d for the last 12 days of each month. MAIN OUTCOME MEASURE(S): Cardiac output, stroke volume, heart rate, end diastolic volume, end systolic volume, ejection fraction, and left ventricular mass were measured by echocardiography; blood and plasma volumes were measured using 125I-albumin dilution. RESULT(S): Cardiac output, stroke volume, left ventricular mass, end diastolic volume, and ejection fraction increased by 12.8%, 11.7%, 9.4%, 7.2%, and 10.9%, respectively, by 16 weeks. End systolic volume decreased, whereas heart rate was unaffected. There was a significant increase in blood volume (5.2%) and plasma volume (4.8%) from baseline during treatment, which could explain the increased cardiac output but not the increased ejection fraction. CONCLUSION(S): Hormone replacement therapy causes modest but significant increases in cardiac output, ejection fraction, and left ventricular mass. These pilot data suggest a direct myocardial effect of HRT that is preload independent.

Blood Volume↗
PubMed1996

Preoperative technetium Tc 99m sestamibi imaging. Paving the way to minimal-access parathyroid surgery.

OBJECTIVE: To examine the reliability of technetium Tc 99m sestamibi scanning as a new adjunct to the surgical management of hyperparathyroidism. DESIGN: Preoperative localization of parathyroid adenoma by technetium Tc 99m sestamibi delayed washing-out scanning and high-resolution ultrasound was compared with a historical institutional experience of surgical intervention without preliminary localization studies. A 10-year retrospective review from 1985 to 1995 of patients with surgical hyperparathyroidism was performed. SETTING: Academic tertiary referral medical center. PATIENTS: Thirty-three technetium Tc 99m sestamibi scans in patients with primary hyperparathyroidism were correlated with eventual surgical and pathologic findings. The last 10 patients were also studied with 10-MHz linear transducer ultrasound, and the results were compared with those of the radionuclide scan and eventual surgical and pathologic findings. From 1985 to 1995, 142 patients underwent surgical exploration for primary hyperparathyroidism, and 125 records were available for review. RESULTS: The technetium Tc 99m sestamibi parathyroid scan correctly identified the site and presence of 31 adenomas among 34 confirmed tumors, a sensitivity of 91% and positive predictive value of 97%. The scan detected three anterior mediastinal adenomas that could not be removed through cervical exploration. In each instance median sternotomy was included in the primary surgery and allowed efficient, successful management of these ectopic adenomas. High-resolution ultrasound correctly identified nine of 10 cervical parathyroid adenomas and predicted the volume of each tumor to a statistically significant level. CONCLUSIONS: Hyperthyroidism has traditionally been treated surgically without preliminary localization studies. We found both technetium Tc 99m sestamibi scanning and high-resolution ultrasound to be highly sensitive at detecting parathyroid adenomas at the 90% level. Furthermore, preoperative localization allowed efficient surgical intervention for our group of patients who had high frequency of mediastinal adenomas that required transmediastinal surgery.

Adenoma↗
PubMed1994

Validation of global and segmental left ventricular contractile function using gated planar technetium-99m sestamibi myocardial perfusion imaging.

OBJECTIVES: The purpose of this study was to test the hypothesis that segmental wall motion analysis determined from gated planar technetium-99m sestamibi myocardial imaging is reproducible and agrees well with echocardiographic data. BACKGROUND: Technetium-99m sestamibi is a new radiopharmaceutical recently approved for myocardial perfusion imaging. Its advantages include a dosimetry that allows use of a dose 10 to 15 times higher than that of thallium-201. As a result, myocardial counts are markedly improved and images can be collected in a gated mode to potentially allow assessment of global and segmental ventricular function. However, the reproducibility and accuracy of technetium-99m sestamibi imaging for measurement of global and segmental left ventricular function have not been evaluated or compared with those of a standard ventricular function technique, such as echocardiography. METHODS: We studied 136 patients referred for clinical technetium-99m sestamibi imaging. One-day rest-stress planar technetium-99m sestamibi protocols were used, gating the stress images. After technetium-99m sestamibi imaging, all patients had standard rest two-dimensional echocardiography. Global and segmental technetium-99m sestamibi and echocardiographic left ventricular contraction was graded qualitatively as normal or abnormal using a four-point grading system. RESULTS: Interobserver and intraobserver agreement was extremely high for global and segmental technetium-99m sestamibi wall motion analysis, with absolute agreements ranging from 0.92 to 1.00 and corresponding kappa values of 0.74 to 1.00 (p < 0.00001). Agreement with global and segmental echocardiographic wall motion was similarly very high, with absolute agreements ranging from 0.93 to 1.00 and corresponding kappa values of 0.75 to 1.00 (p < 0.00001). CONCLUSIONS: Gated technetium-99m sestamibi cardiac imaging provides information with regard to rest global and segmental left ventricular systolic function that is highly reproducible and agrees very well with results of two-dimensional echocardiography.

Adult↗
PubMed1993

Surgical resection and radiolocalization of the sentinel lymph node in breast cancer using a gamma probe.

We have recently reported on a technique of gamma probe localization of radiolabelled lymph nodes to identify the sentinel node in malignant melanoma. In order to determine whether this technique is applicable to assist in staging breast cancer, a pilot study was begun to address two questions: (i) can the sentinel lymph node draining a breast cancer be identified for selective resection; and (ii) is the sentinel lymph node predictive of the status of the entire axillary lymph nodes? One to four hours prior to axillary lymph node dissection, 22 consecutive patients had approximately 0.4 mCi of technetium sulfur colloid in 0.5 ml saline injected around the perimeter of the breast lesion. A hand-held gamma counter was used at surgery to locate the lymph node(s) receiving drainage from the breast. A sentinel lymph node was identified in 18 of 22 patients. Of these 18 patients, the sentinel lymph node was positive in seven of seven patients, with pathologically verified metastatic breast cancer to at least one lymph node. In three out of seven patients, the sentinel lymph node was the only lymph node with metastatic cancer. In this pilot study of breast cancer patients, we conclude that: (i) radiolocalization and selective resection of sentinel lymph nodes is possible; and (ii) the sentinel lymph node appears to predict correctly the status of the remaining axilla. These data justify a larger clinical trial to verify the value of this technique.

Adult↗
PubMed1993

Gamma-probe-guided lymph node localization in malignant melanoma.

The initial draining lymph node (sentinel node) has been successfully localized using intraoperative vital dye mapping and reportedly is predictive of regional nodal metastases in Clinical- Stage 1 melanoma. In an animal model, we previously established the technique of gamma-probe-guided localization of the technetium-99 sulfur colloid labelled sentinel node and found its sensitivity equal to vital dye mapping. We now report our initial experience using gamma-probe-guided localization to identify and then surgically remove the first draining lymph node(s) in 10 malignant melanoma patients. Lymphoscintigraphy was used to confirm localization. We conclude that this technique: (a) reliably localizes the sentinel node draining the site of a primary melanoma, (b) allows the lymphatic bed to be checked intraoperatively verifying complete sentinel node biopsy, and (c) is relatively simple and can be performed under local anaesthesia.

Adult↗
PubMed1991

Legionnaires' disease.

The Legionella bacillus is a relatively common pulmonary pathogen that has been responsible for a number of outbreaks of respiratory illness this century. Not until 1976, however, after exciting epidemiologic and microbiologic investigation, was the organism isolated and identified. Legionnaires' disease does not have a characteristic radiographic appearance, but certain features may alert the clinician to its presence. It often rapidly progresses to a lobar pneumonia that may not respond immediately to treatment. The radiographic findings lag behind clinical improvement, and radiographic resolution is prolonged. Organ transplantation patients often present with ill-defined, rounded, pleura-based opacities that may simulate pulmonary infarction and can cavitate.

Humans↗
PubMed1983

The chest radiograph in Legionnaires' disease. Further observations.

Chest radiographs of 70 patients with Legionnaires' disease were evaluated and compared to the authors' previous series of 24 patients as well as others in the literature. A larger number of patients in the more recent survey had pleural effusion, and there were 3 with cavitation whereas none was seen previously. Analysis of the radiograph showing the most marked changes in survivors versus patients who died showed no consistent pattern, indicating that the radiograph cannot be used as a prognostic indicator. On long-term follow-up (mean, 104.2 days), the radiograph remained abnormal for many months and demonstrated a variety of slowly resolving or permanent abnormalities.

Adolescent↗
PubMed1978

The chest radiograph in legionnaires' disease.

The chest radiographs of 24 patients with documented Legionnaires' disease were evaluated. Twenty-two of the 24 patients had positive findings for the disease initially. There was unilateral involvement in 68% and the most common lung shadows were poorly marginated round opacities (46%), diffuse patchy (25%) and peripheral opacities (21%). At peak, 70% of patients had a lobar shadow. Pleural effusions were present in 39% of cases but could be explained by underlying congestive heart failure or renal failure in 7 of the 9. Although the findings are not specific, the radiologist should consider this diagnosis in a patient with compatible clinical history, a pneumonia of obscure etiology, and these radiographic manifestations.

Adolescent↗
PubMed1977

Biplane translumbar aortography for evaluation of peripheral vascular disease.

Complete evaluation of the aortoiliac femoropopliteal system is necessary for the proper evaluation of lower extremity peripheal vascular ischemic disease. We have used a modified infrarenal translumbar approach since it is both safely and rapidly performed. An analysis of 212 consecutive cases (the last 182 with translumbar technic) revealed that 72 per cent of patients had significant atherosclerotic involvement of the aorta or one or more common or external iliac arteries, 43 per cent had significant bilateral involvement, and it was judged that retrograde femoral catheterization would have been difficult or impossible in 38 per cent. Biplane aortoiliac evaluation was added in our last seventy-nine studies. This provided additional diagnostic help in thirty-six of these cases and revealed an abnormality not otherwise visible in six of these patients. There were no serious complications in this series.

Aorta, Abdominal↗