RESUMEN

AIMS: To evaluate outcomes after treatment with image-guided stereotactic body radiation therapy (SBRT) using daily online cone beam computed tomography for malignancies metastatic to the lung. MATERIALS AND METHODS: Forty-seven lung metastases in 32 patients were treated with volumetrically guided SBRT. The median age was 62 years (21-87). Primaries included colorectal (n = 10), sarcoma (n = 4), head and neck (n = 4), melanoma (n = 3), bladder (n = 2), non-small cell lung cancer (n = 2), renal cell (n = 2), thymoma (n = 2), thyroid (n = 1), endometrial (n = 1) and oesophageal (n = 1). The number of lung metastases per patient ranged from one to three (68% single lesions). SBRT was prescribed to the edge of the target volume to a median dose of 60 Gy (48-65 Gy) in a median of four fractions (four to 10). Most lesions were treated using 12 Gy fractions (92%) to 48 or 60 Gy. RESULTS: The median follow-up was 27.6 months (7.6-57.1 months). The 1, 2 and 3 year actuarial local control rates for all treated lesions were 97, 92 and 85%, respectively. Two patients with colorectal primaries (four lesions in total) had local failure. The median overall survival was 40 months. The 1, 2 and 3 year overall survival from the time of SBRT completion was 83, 76 and 63%, respectively. There were no grade 4 or 5 toxicities. Grade 3 toxicities (one instance of each) included pneumonitis, dyspnoea, cough, rib fracture and pain. CONCLUSION: SBRT with daily online cone beam computed tomography for lung metastases achieved excellent local tumour control with low toxicity and encouraging 2 and 3 year survival.

Asunto(s)

RESUMEN

The aim of this study was to identify useful patterns of abnormal fluorine-18 fluorodeoxyglucose (FDG) uptake by different types of non-small cell (NSC) lung cancer and to assess their clinical implications. One hundred and three sequential patients with newly diagnosed, pathology-proven NSC lung cancer were included. FDG positron emission tomography (PET) images were acquired using a dedicated PET scanner. There were 35 squamous cell carcinomas (SQC), 17 large cell cancers (LGC), 38 adenocarcinomas (ADC), 1 bronchioloalveolar carcinoma (BAC) and 12 non-classified NSC cancers. PET images were categorized into detectable patterns of necrotic center in the primary tumor, satellite lesions (T4), hilar lymph nodes (N1), and N2, N3, and M1 lesions by visual interpretation of PET images for SQC, LGC, and ADC (n=90; BAC and non-classified NSC cancers were excluded). The PET lesions were correlated with surgical pathology and with CT findings in inoperable cases. Necrosis was more commonly present in the primary tumors of LGC (53%) and SQC (43%) than in those of ADC (26%) (P<0.0001 and <0.01, respectively). The frequencies of nodal uptake in ADC, SQC and LGC were similar (71%, 60%, and 59%, respectively). However, M1 lesions were present significantly more often in LGC (41%) and ADC (34%) than in SQC (3%) (both P<0.0001). Significantly more surgically inoperable cases were found by PET (T4, N3, M1) in ADC (50%) and LGC (41%) than in SQC (26%) (P<0.001 and <0.02, respectively). Our results suggest a wide variation of PET findings for different types of NSC lung cancer. Identification of these patterns is useful in clinical PET interpretation, in that knowledge of the most probable association between the PET patterns and the histological types will facilitate initial staging and planning of management.

Asunto(s)

RESUMEN

Anecdotal reports support the use of octreotide in the treatment of traumatic thoracic duct injuries and chylothorax, but no prospective studies have proved its efficacy. We evaluated the effects of octreotide in treating thoracic duct transection in a canine model. Eight mongrel dogs (27.8+/-5.1 kg) were fed one pint of 10.5 per cent milkfat 2 hours before operation. Through a left supraclavicular neck incision, the thoracic duct was identified and transected, producing free flow of chyle. A quarter-inch drain was tunneled subcutaneously from the wound and attached to closed suction. After wound closure dogs were randomized to a control group (n = 4) receiving sham injections of saline subcutaneously three times per day, or a treatment group (n = 4) given 3 microg/kg octreotide three times per day. Postoperatively all dogs were fed a standard low-fat (5-7%) crude fat diet. Drain output was measured each day, and on odd-numbered postoperative days the drainage was analyzed for cholesterol, triglycerides, albumin, and total protein. Fistula closure was defined as drainage <10 ml/24-hour period. Treated dogs achieved fistula closure significantly faster than controls: 3.5+/-1.3 days versus 7.8+/-1.0 days (P = 0.0037). Whereas equivalent amounts of drainage occurred on the day of surgery and on postoperative day one in both groups, by postoperative day 2 the treatment group had significantly less drainage over 24 hours: 63+/-69 ml versus 195+/-79 ml (P = 0.046); this significant difference persisted through postoperative day 5 when drainage began to decrease in the control group. No significant differences between groups were seen in levels of cholesterol, triglycerides, albumin, or protein in the drainage at any time point. We conclude that octreotide is effective in treating thoracic duct injury, leading to an early decrease in drainage and early fistula closure. The mechanism for this effect remains to be clarified.

Asunto(s)

RESUMEN

The technique of pulmonary lymphoscintigraphy was used to evaluate pulmonary lymphatic flow and to assess reestablishment of lymphatic drainage after lung transplantation. A first group of six control dogs underwent percutaneous transthoracic injection of a radiocolloid into the periphery of the left upper and lower lobes. Radiocolloids are large molecules tagged with radioisotopes that are absorbed only through lymph and are concentrated in tributary lymph nodes. Twenty-four hours after injection the dogs underwent scintigraphic studies of the chest and upper part of the abdomen. Mediastinal lymph nodes were visualized in all animals. A second group of four dogs underwent partial reimplantation of the native left lung, with interruption of all lymphatic connections between the lung and mediastinum. Lymphoscintigraphic studies of the left lung were obtained on the third postoperative day and then weekly for 4 weeks. Three of the four dogs in this group did not have visible mediastinal nodes 3 days after the operation. Nodes were visualized in all animals at 1 week and at all following studies. A third group of five dogs were subjected to left lung allotransplantation by means of standard surgical techniques, as well as immunosuppression. The animals were studied with radiocolloid injections and lung lymphoscintigraphy at weekly intervals for 6 weeks. Mediastinal nodes were visualized for the first time 2 to 4 weeks after the operation and at every subsequent study. We conclude that lung lymphoscintigraphy is a reliable technique for the study of pulmonary lymphatic flow. This experiment demonstrates that lymphatic drainage after lung transplantation is reestablished as early as the second postoperative week.

Asunto(s)

RESUMEN

The operative approach to primary hyperparathyroidism due to a single adenoma remains controversial. We evaluated our experience with 75 patients presenting with primary hyperparathyroidism between January 1979 and September 1988. Prior to 1985 all patients underwent bilateral exploration. During this period, ultrasonographic localization in 6 patients proved highly accurate. Subsequently, routine preoperative ultrasonographic localization was used and patients were prospectively evaluated for the following: (1) incidence of unilateral exploration, (2) accuracy of ultrasonographic localization, (3) incidence of complications, and (4) operative time. Localization permitted unilateral exploration in 19 of 36 patients, although its accuracy depended on the interest of the radiologist involved. Institution A had an accuracy of 92%, while institution B had an accuracy of only 43%. There were fewer complications with unilateral exploration, and operative time was significantly less. Unilateral exploration based on preoperative ultrasonographic localization is recommended as the initial approach to primary hyperparathyroidism due to a single adenoma.

Asunto(s)

RESUMEN

In 5 latency-age boys, methylphenidate plasma concentrations following multiple doses of methylphenidate were consistently higher than those obtained after a single dose. Pharmacological and clinical implications are discussed.

Asunto(s)

RESUMEN

The role of a child in his/her physical abuse was reviewed with particular attention to hyperactive children. A retrospective analysis of the records of children referred to a university-based hyperactive children's clinic revealed that children both with and without Attention Deficit Disorder (ADD) were more often physically abused than children in the general population. The period prevalence of physical abuse in children with ADD did not differ significantly from that in children without ADD. This suggests that hyperactivity may either contribute to, or result from, physical abuse.

Asunto(s)

RESUMEN

Hyperactivity, or attention-deficit disorder, is a common disorder of childhood and has serious sequelae. Patients with this problem present frequently to the family physician's office. The physician should be able to perform a thorough evaluation that includes a family interview, a teacher consultation, and referral for psychological testing. Once the diagnosis of hyperactivity (attention-deficit disorder) is made, a comprehensive treatment plan is initiated that includes the use of stimulants, family counseling with an emphasis on behavioral management of the child and support of the parents and siblings, and initiation of school intervention. Many parents inquire about diet therapy, which may be of help with some children but should not be used to the exclusion of other treatment approaches.

Asunto(s)

Asunto(s)

Asunto(s)