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L F Urdaneta

Publications and source records attributed to L F Urdaneta.

At least 19 recordsLinked to original sources
PubMed2001

The nasogastric tube syndrome: two case reports and review of the literature.

BACKGROUND: The nasogastric tube syndrome is a potentially life-threatening complication of an indwelling nasogastric (NG) tube. The syndrome is thought to result from ulceration and infection of the posterior cricoid region with subsequent dysfunction of vocal cord abduction. This dysfunction may present as complete loss of vocal cord abduction manifested as serious airway compromise. Reports of this syndrome are infrequent, with only 29 cases published to date. METHODS: Two additional cases of nasogastric tube syndrome diagnosed at the University of Iowa Hospitals and Clinics over a 2-year period are presented. A search of MEDLINE (1966 through February 1999), including review of those articles' references identified seven previous publications, including 29 case reports. These 29 cases are reviewed and the findings summarized. RESULTS: Twenty-nine cases of NG tube syndrome are identified, with 16 of these occurring in the preantibiotic period. Including the two cases presented here, 15 contemporary patients are examined. Among these 15 cases, 10 required tracheostomy, on average 8.5 days after NG tube placement. CONCLUSION: Although the fully manifested syndrome presents quite dramatically, we suspect that a clinical spectrum of severity exists with less severe cases going unrecognized. Consistent with previous reports, we found that direct visualization of the postcricoid region is required to rule out the diagnosis and recommend such action be taken whenever the diagnosis is suspected. Treatment should include establishment of a safe airway, removal of the tube whenever possible, antibiotic therapy, and antireflux therapy.

Aged↗
PubMed1997

Spigelian hernia: diagnosis by high-resolution real-time sonography.

The purpose of this study was to demonstrate the role of high-resolution real-time sonography in the diagnosis of spigelian hernias. The sonographic findings in three patients, two of whom had surgical confirmation, are presented. We also discuss and demonstrate the anatomic and pathologic factors that predispose to these hernias. In all three cases, real-time high-resolution sonography was very helpful in providing detailed images of the abdominal wall defect, the hernial sac and contents, and the relationship of the contents to the spigelian fascia and the rectus, external oblique, and internal oblique muscles. The role of the Valsalva and other provocative maneuvers in demonstrating the "in and out" sliding movement of the contents of the hernia also is discussed. Although the number of cases in our study is small, we think that this modality may be the most effective means for establishing this diagnosis, especially in cases with equivocal clinical findings.

Abdominal Muscles↗
PubMed1991

Pleomorphic melanoma mimicking sarcoma.

Malignant melanoma may display a wide variety of unusual morphologic patterns that simulate unrelated neoplasms. The diagnostic approach to such complex and morphologically divergent lesions requires thorough and extensive scrutiny not only by routine light microscopy, but also by immunohistochemical and ultrastructural evaluation. We have reported the case of a patient with a mass on the heel exhibiting complex morphology that illustrates the value of such a systematic approach.

Diagnosis, Differential↗
PubMed1990

Adenocarcinoma of the vermiform appendix.

Primary adenocarcinoma of the appendix is rare. Eleven patients with this rare neoplasm have been evaluated at our institution over a 50-year period. We have reviewed the presentation and clinical course of these patients, and have compared them with those described in the literature. The presenting signs and symptoms, physical findings, and treatment were similar to those described in the literature. However, the 5-year survival of 20% is lower than most series, and reflects the advanced stage of disease at the time of diagnosis in this group of patients. Despite the low 5-year survival, we feel that aggressive therapy (right hemicolectomy) is necessary to obtain long-term survival.

Adenocarcinoma↗
PubMed1990

The prevalence and severity of late effects in normal rat duodenum following intraoperative irradiation.

In humans, a portion of the duodenum is often at risk for radiation-induced complications following intraoperative radiation therapy for pancreatic carcinoma. To determine experimentally the prevalence and severity of late effects in the normal mammalian duodenum, 190 rats received single doses of 0, 15, 20, 25, 30, or 40 Gy orthovoltage X rays to temporarily exteriorized 3 cm circumferential segments of duodenum. The animals were killed 2, 6, 8, or 10 months later. Actuarial survival, change in body weight, and a radiation injury score based on eight histopathologic alterations were used as endpoints. Epithelial atypia, intestinal wall fibrosis, serosal thickening, and vascular sclerosis were the dominant histopathologic alterations at all dose levels throughout the 10-month observation period. The prevalence and severity of histologic radiation injury showed sigmoidal dose-response relationships with the plateaus starting at 20 Gy. Doses of 20 Gy or greater also resulted in a substantial loss of body weight and a high level of early deaths (20-80 days). All endpoints indicate that intraoperative doses of 20 Gy or greater are associated with unacceptable risks of late and irreversible complications.

Animals↗
PubMed1989

Factitious microcalcifications in breast biopsy material: laboratory-induced error by use of tattoo powder for specimen mammography.

A xeromammogram led to the surgical excision of a calcified breast lesion on a 66-year-old female. Before specimen mammography was performed, the excised tissue was oriented with tattoo pigment. The specimen mammogram then revealed multiple calcifications caused by unsuspected radio-opaque material in the tattoo pigment, and the original calcifications were obscured. This case demonstrates the hazards involved utilizing tattoo powders for orienting xeromammographically discovered specimens.

Aged↗
PubMed1989

Gastrointestinal carcinoid tumor metastatic to the orbit.

Primary gastrointestinal carcinoid tumors rarely metastasize to the orbit, but an aggressive approach is warranted for any patient with a history of carcinoid tumor and ocular complaints. The diagnosis can be established only by obtaining tissue for histologic examination. Treatment, usually with radiation, can result in symptomatic improvement and should be considered after confirmation of the diagnosis.

Aged↗
PubMed1988

Intraoperative irradiation in a rat model: histopathological changes in irradiated segments of duodenum.

During intraoperative radiation therapy for carcinoma of the head of the pancreas in humans, a portion of duodenum is often at risk for radiation-induced complications because of its fixed anatomical position within the treatment field. This study was undertaken to determine the feasibility of using the rat as a model to determine the radiotolerance of normal mammalian duodenum. The procedures used to exteriorize and irradiate a selected segment of duodenum are described. Histopathologic changes in 5-cm segments of midduodenum were studied 14 and 28 days after 0, 30, 40, or 50 Gy X-radiation. Complete denudation of the epithelium and thickening of the muscularis and serosal layers occurred in all irradiated segments by day 14. By day 28, even though crypt and villus architectures were atypical, large areas of epithelial regeneration were seen in rats receiving 30 Gy. In contrast, complete denudation of the epithelium were still evident along most of the length of the irradiated segments in rats receiving 40 or 50 Gy. Serosal fibrosis was prominent in all irradiated animals, regardless of dose. These results indicate that radiation doses above 30 Gy carry high risks of complications. The rat is considered a suitable animal model.

Animals↗
PubMed1988

Rational ordering of cervical spine radiographs following trauma.

A retrospective review of 312 hospitalized patients with cervical spine injuries was conducted to identify presenting signs, symptoms, and coexisting conditions, and to determine if any injuries were not diagnosed in the emergency department. Of the 257 (82%) patients who were alert on ED evaluation, 215 (84%) complained of neck pain or tenderness. Of the remaining 42 alert patients without neck pain, 34 had sensory or motor symptoms or signs suggestive of cervical spine injury, and eight had significantly painful other injuries. Of the 284 patients presenting within the first 48 hours after injury, 23 were not diagnosed initially, 21 because radiographs were initially read as negative and two because no radiographs were taken. A significant number of patients had more than one fracture of the spinal column. A stepwise approach to rational ordering of cervical spine radiographs in blunt trauma is proposed.

Adult↗
PubMed1987

Role of an emergency helicopter transport service in rural trauma.

The records of 916 trauma victims transported by an emergency helicopter service were reviewed to evaluate its impact on patient outcome. According to strict criteria, the service was classified as essential, helpful, or "not a factor" in the preservation of life and/or limb in each case. The helicopter service was essential in 14.0%, helpful in 12.9%, and "not a factor" in 56.6% of patients. A fourth category included patients who, despite the delivery of maximal emergency medical care, died as a result of their injuries (16.5%). With the available initial information, it was impossible to determine prospectively which patients would benefit from air transport. We believe that the rapid evaluation of potentially serious injuries and the number of patients for whom the service proved beneficial justify its use, particularly in rural areas.

Adolescent↗
PubMed1987

High-resolution sonography of acute appendicitis.

During a 7-month period high-resolution sonography was used in the evaluation of 68 patients with an equivocal clinical diagnosis of acute appendicitis. The sonographic findings were correlated with surgical-pathologic outcome in 32 cases and with clinical follow-up in the remainder. This technique was found to be accurate in the diagnosis of acute appendicitis with a specificity of 95%, a sensitivity of 80%, and an accuracy of 90%. The predictive value of a positive test was 91%; that of a negative test was 89%. The results show that high-resolution sonography is indicated to establish the diagnosis of acute appendicitis in patients with equivocal clinical findings.

Acute Disease↗
PubMed1986

Massive hemoperitoneum secondary to spontaneous rupture of hepatic metastases: report of two cases and review of the literature.

Two cases of massive hemoperitoneum secondary to spontaneous rupture of hepatic metastases are presented. This devastating complication of hepatic malignant disease is difficult to diagnose preoperatively. However, the diagnosis should be considered in patients with known malignant disease who present with unexplained blood loss, shock, or signs consistent with an acute surgical abdomen. The presence of fever and leukocytosis with these signs and symptoms may also be part of the clinical picture. Treatment by hepatic resection is never curative. Review of the literature indicates that local control of the bleeding site by suture ligature, packing with topical hemostatic agents, or hepatic artery ligation offers the best chances of obtaining hemorrhage control and some degree of palliation in these desperately ill patients.

Adenocarcinoma↗
PubMed1986

Malignant melanoma in childhood and adolescence.

A retrospective chart review of 25 patients under the age of 20 years with malignant melanoma, diagnosed between the years 1938 and 1984 at the University of Iowa Hospitals and Clinics, was conducted. Nine of the patients were under the age of 14 years, and 18 patients were females. There appeared to be a frequent delay in diagnosis of the primary lesion, occasionally incorrect initial diagnosis, and under-treatment in these young patients. Primary treatment varied from limited excision of the lesion to wide excision and regional lymph node dissection. Females appeared to have a better prognosis than males, and wide local excision with or without regional lymph node dissection was associated with the most favorable outcome. Overall 10-year survival in this group of patients was 56 per cent, a rate that compares well to the overall survival in adult patients with malignant melanoma.

Adolescent↗
PubMed1985

Carcinoid tumors of the gastrointestinal tract.

Carcinoid tumors continue to be of specific clinical interest because of their diverse presentation, hormonal secretion, and malignant potential. One hundred ninety-two patients with carcinoid tumors were treated at the University of Iowa Hospitals and Clinics between 1938 and 1982. The most common location of these tumors was the appendix (30%), followed by the ileum (23%) and rectum (9%). Metastatic disease occurred in 29 per cent of all patients, with colonic and ileal tumors being the most likely to metastasize (40% and 35%, respectively). Surgical excision continues to be the treatment of choice in resectable tumors. Appendectomy alone proved effective in the treatment of appendiceal tumors less than 2 cm in diameter and without lymph node metastases. Local excision was also sufficient for the treatment of rectal tumors less than 2 cm in diameter and without invasion of the muscularis propria. Ileal, colonic, and locally advanced appendiceal and rectal tumors should be treated with radical excision including resection of the regional lymph nodes. The overall 5-year survival rate was 47%. Patients with metastatic disease had a lower survival rate (25%) compared with patients without metastases (64%).

Adolescent↗
PubMed1985

Male breast carcinoma.

Fifty men with primary breast carcinoma were seen between the years 1938 and 1983 at the University of Iowa Hospitals and Clinics. In most patients, there was a significant delay between the onset of symptoms and seeking medical advice (mean, 21 months; range, 1-156). The vast majority of patients were treated by simple, modified radical, or radical mastectomy. Ten patients underwent incisional or excisional biopsy with or without radiation because of locally advanced disease or distant metastases. Survival was comparable in the groups of patients treated with simple mastectomy (mean, 70 months), modified radical mastectomy (mean, 61 months), and radical mastectomy (mean, 78 months). Local recurrence occurred in 25 per cent of all patients, and this rate was not dependent on the operation performed. The data suggest that modified radical mastectomy is adequate therapy for local control and staging of the disease without reducing survival from that observed after radical mastectomy.

Adult↗