Magnetic retrieval of foreign body from stomach.
Explore the source record for details and available documents.
Child, Preschool↗
Biomedical subjects
H Vargas
Publications and source records attributed to H Vargas.
Lymphoepitheliomas of the laryngohypopharynx.
Explore the source record for details and available documents.
Aged↗
Can perforated appendicitis Be diagnosed preoperatively based on admission factors?
The optimal initial treatment for selected patients with perforated appendicitis may be nonoperative. For this reason it is important to be able to diagnose perforated appendicitis preoperatively. The purpose of this study was to determine the accuracy of diagnosing perforated appendicitis using only admission factors. The study population was comprised of 366 adult patients who underwent appendectomy for presumed appendicitis during 1997. Admission factors associated with perforated appendicitis were determined using univariate and multivariate analyses. These variables were then used to formulate a rule for the diagnosis of perforated appendicitis. Sensitivity and specificity were calculated for this rule. The admission factors analyzed were sex, race, age, days of pain, temperature, heart rate, symptoms, physical examination findings, and laboratory findings. Multivariate regression analysis revealed days of pain, temperature, and localized tenderness outside the right lower quadrant to be significant (P <0.05). Using two or more days of pain, a temperature of >/=101 F (38.3 C), or localized tenderness outside the right lower quadrant as criteria to indicate perforation, we achieved a sensitivity of 86% and a specificity of 58% for distinguishing perforated from nonperforated appendicitis. We concluded that (1) perforated appendicitis cannot reliably be distinguished from nonperforated appendicitis based on admission factors, and (2) two or more days of pain, localized tenderness outside the right lower quadrant, and a temperature of >/=101 F (38.3 C) define a group of patients with appendicitis who have a high incidence of perforation.
Adolescent↗
A photoacoustical radiation dosimeter.
A new type of radiation dosimeter using the photoacoustical effect is described. The photoacoustical radiation dosimeter (PARD) is capable of directly measuring the energy absorbed in the detecting element. For a completely absorbing element, the energy fluence rate in the radiation beam is measured. It is thus a calorimetric dosimeter. Since the energy sensor can be calibrated with another form of energy, it has the potential for being an absolute radiation dosemeter. Measurements were made using 50 to 100 kVp x rays with exposure rates at the detector of 2.6 x 10(-6) C/kg/s (10 mR/s) to 5 x 10(-5) C/kg/s (200 mR/s). The minimum measurable exposure rate at 90 kVp is 5 x 10(-7) C/kg/s (2 mR/s). For a given x-ray spectrum, the PARD has a linear response with radiation intensity and an inverse response with chopping frequency. With appropriate design parameters, we believe the PARD may be used to measure any photon energy or any type of radiation particle.
Acoustics↗
[Our experience in maxillofacial trauma].
Explore the source record for details and available documents.
Humans↗
Shoulder girdle compression syndrome.
Nowadays all compression syndromes at the upper chest like the costoclavicular syndrome, the scalenus syndrome, the hyperabduction syndrome and the Page-von Schroetter syndrome are included under the term of thoracic-outlet-syndrome. Apart from a constitutional disposition (cervical rib, anomalies of the tendons, etc.), it needs special factors like professional activities, sports, trauma, etc. to develop a T.O.S. syndrome. The symptoms range from prickling paresthesia, early fatigue, pains in shoulder and neck, claudication like pains and strong tendency towards swelling and rest pain or peripheral gangrene. Among 3126 vascular-surgical operations 128 transaxillary rib resections were performed during the time from June 1st, 1975 until March 31st, 1980. On 105 occasions rib resection was combined with the thoracic sympathectomy. In only 4 cases the resection of a cervical rib was sufficient to obtain decompression; in 15 cases the first rib had to be resected with a cervical rib. In 3 cases direct reconstructions of the artery and subclavian vein was performed by way of transaxillary approach. Postoperatively, 56% of the patients remained completely asymptomatic, 32% were decidedly improved and 12% unchanged.
Adult↗
Arterial reconstruction for distal disease of the lower extremities by the in situ vein graft technique.
From January 1st, 1975 to December 31st, 1979, 285 femoropopliteal and femorocrural bypasses have been performed in 260 patients. In 57% of all cases the operation was carried out for limb salvage. The first 100 in situ transplants were angiographically examined 2 years after the operation. 5 years after the operation all patients were examined clinically, angiologically and by ultra sound Doppler technique. The patency rate amounts to 84% after 2 years and 76% after 5 years. With a patency rate of 57% after 2 years and 38% after 5 years the results achieved in the revascularization of a single crural artery are much more unfavourable. The results may be compared with those demonstrated by other authors who use the in situ technique. Compared to the classical venous bypass, the in situ bypass comes off a little better after a five years period.
Aged↗
[Neonatal screening for congenital hypothyroidism and phenylketonuria].
A newborn screening program for congenital hypothyroidism (CH) and phenylketonuria (PKU) was conducted in 140 163 infants from the Federal District and the states of Mexico and Tlaxcala. These children were born mainly in hospitals for the non-insured population, although some were social security beneficiaries. Their filter-paper blood TSH and phenylalanine concentrations were determined 48 hours after birth. The frequency of CH was 1:1 797, with a 95 per cent confidence interval of 1:1 470 to 1:2 315, and was quite similar in the different types of hospitals. Only two PKU cases were found, for a frequency of 1:70 082, with a 95 per cent confidence interval of 0 to 1:4 762. This work demonstrates the feasibility of newborn screening programs in Mexico, identifies the problems to be solved in order to achieve a wide coverage and establishes the high frequency of CH in the Mexican population.
Age Distribution↗
Fine needle aspiration cytology of breast ductal carcinoma in situ.
To evaluate the role of fine needle aspiration cytology (FNAC) in identifying in situ breast carcinoma, we reviewed 19 FNACs of histologically confirmed pure or predominantly ductal carcinoma in situ (DCIS). The cytologic diagnosis was positive for malignancy in 53%, suspicious in 31% and nondiagnostic in 16%. An intraductal lesion was suggested prospectively in 21%. Retrospective review showed three distinctive cytologic criteria in cases with DCIS: (1) cohesive groups of atypical ductal cells associated with scattered, individual malignant cells or a necrotic background; (2) hyperplastic ductal cells with associated malignant cells or necrosis; and (3) true tissue fragments composed of cohesive epithelial cells with a cribriform pattern. One or more findings were present in 81% of the malignant or suspicious FNACs; 19% could not be distinguished cytologically from invasive carcinoma. We studied a control group of 30 invasive ductal carcinomas; one or more criteria were found in 35% of cases with no or a minor DCIS component but in 73% of those with an extensive DCIS component. We conclude that these three criteria deserve further study as an aid in suggesting DCIS on FNAC.
Adult↗