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Biomedical subjects

R Gupta

Publications and source records attributed to R Gupta.

At least 199 records · Page 11Linked to original sources
PubMed2001

Low-voltage paper electrophoretic study of ion-pair formation and electrochromatography of inorganic anions on papers impregnated with titanium (IV) tungstate.

The ion-pair formation and electrochromatographic behavior of 22 anions are studied on plain and titanium (IV) tungstate impregnated papers using 0.1 N and 1 N solutions of NaNO3, Mg(NO3)2, Al(NO3)3, Cr(NO3)3, and Co(NO3)2 as background electrolytes. The effect of ion-pair formation on the migration of anions is studied. In general, the mechanism of migration is explained in terms of adsorption, precipitation, and complex formation. A number of binary and ternary separations are achieved. In Mg(NO3)2 media, the migration is correlated with the solubility of their magnesium salts for SO3(2-), C2O4(2-), SeO3(2-), AsO4(3-), and Fe(CN)6(4-).

Journal Article↗
PubMed2001

Detection of coronary artery disease by stress thallium scintigraphy in diabetic patients.

We investigated the efficacy of exercise stress thallium in the diagnosis of coronary artery disease in patients with diabetes mellitus. Forty-three patients with known diabetes and suspected of having coronary artery disease were included in the study. All the patients underwent coronary angiography, 24 had significant coronary artery stenosis and 19 had normal coronaries. Out of the 24 patients with a positive angiographic finding, thallium scintigraphy was positive in 21 patients (sensitivity, 87.5%); and false negative in only three of the 24 patients. Out of the 19 patients with normal angiography findings, 16 patients had a normal thallium scan (specificity, 84.2%) and the remaining three had a positive thallium scan. This gives thallium scintigraphy a positive predictive value of 87.5% and negative predictive value of 84.2% when compared with coronary angiography. The findings of this study suggest that stress thallium scintigraphy is a useful modality in screening of coronary artery disease in diabetic patients.

Aged↗
PubMed2001

The innervation of the triangular fibrocartilage complex: nitric acid maceration rediscovered.

Injury to the triangular fibrocartilage complex (TFCC) is frequently implicated in the etiology of ulnar-sided wrist pain. This study examines the nervous anatomy of the TFCC using a nitric acid maceration technique and attempts to correlate this information with known tear patterns. Ten fresh frozen cadaveric specimens were studied in detail. Gross dissection of each upper-extremity specimen included removal of all flexor and extensor tendons. After identification and labeling with permanent color of the ulnar nerve, dorsal sensory branch of the ulnar nerve, posterior interosseous nerve, anterior interosseous nerve, and median nerve, an en bloc excision of the distal radioulnar region was performed. Digestion of the soft tissue was performed with nitric acid at sequential concentrations of 50% and 33% for 9 of 10 specimens. The digestion was halted by immersing the specimen in a mixture of 10% formaldehyde and 1% glycerine. After removal of bone, the specimens were fixed in paraffin, sectioned, and stained with hematoxylin and eosin. Nine of the 10 specimens were studied microscopically to determine the contribution of the grossly identified nerves to each zone of the triangular fibrocartilage complex as defined by Palmer's classification of acute TFCC tears. The anterior interosseous, median, and superficial radial nerves did not contribute to the innervation of the TFCC. The intraarticular course of the peripheral nerves could not be defined in the one specimen that was not digested with nitric acid. Nitric acid maceration is a rediscovered technique for identifying the nervous anatomy of soft tissues. The study showed that the triangular fibrocartilage complex is innervated by branches of the posterior interosseous, ulnar, and dorsal sensory ulnar nerves in a fairly consistent manner. Improved treatment of TFCC tears may result from an enhanced understanding of the supporting structures' innervation and mechanical function.

Cartilage, Articular↗
PubMed2001

Prevalence of hepatopulmonary syndrome in cirrhosis and extrahepatic portal venous obstruction.

OBJECTIVE: Hepatopulmonary syndrome (HPS) is characterized by arterial hypoxemia in patients with chronic liver disease caused by abnormal intrapulmonary vasodilations. Data on its frequency vary from 5% to 29%. Most of these studies are from the West and in patients with cirrhosis. We, therefore, studied the prevalence of HPS in patients with liver cirrhosis and extrahepatic portal venous obstruction (EHPVO). METHODS: We studied 54 consecutive patients with liver cirrhosis (42 men and 12 women; mean age = 44.2 +/- 13 yr; Child grade A: 13, B: 22, and C: 19) and 50 patients with EHPVO (31 men and 19 women; mean age = 23.3 +/- 7.8 yr) Diagnosis of cirrhosis was made by history, liver function abnormalities, endoscopy, and sonography, whereas EHPVO was diagnosed by demonstration of a block in the splenoportovenous axis on sonography. Each of the patients underwent chest x-ray, arterial blood gas analysis, contrast-enhanced echocardiography (CEE), and pulmonary function tests. HPS was diagnosed in a patient with positive CEE, in the presence of hypoxia (PaO2 < 70 mm Hg) and/or elevated alveolar arterial oxygen gradient of > 20 mm Hg in the absence of any underlying cardiopulmonary disease. RESULTS: Ten of 54 patients (18.5%) with cirrhosis were positive on CEE compared with two of 50 patients (4%) with EHPVO. Six of the 10 patients positive with cirrhosis for CEE had associated hypoxia, whereas only one EHPVO patient with positive CEE had an elevated pulmonary alveolar arterial oxygen gradient of > 20 mm Hg. Thus, the incidence of HPS was 11.1% in patients with cirrhosis, compared with 2% in patients with EHPVO. One patient with HPS and cirrhosis had clinical cyanosis. CONCLUSION: HPS occurs more commonly in patients with cirrhosis but can also be seen in patients with EHPVO.

Adolescent↗
PubMed2001

The burden of drug-resistant tuberculosis and mechanisms for its control.

Drug resistance in tuberculosis is largely a man-made phenomenon caused by erroneous prescribing practices on the part of physicians and noncompliance on the part of patients. The global epidemiology of drug-resistant TB, the impact of standardized short-course chemotherapy (SSC), and the potential future evolution of MDR TB are discussed in this chapter.

Animals↗
PubMed2001

Cervical tuberculous lymphadenopathy: changing clinical pattern and concepts in management.

Tuberculosis is one of the biggest health challenges the world is facing. In this study the clinical pattern of patients with cervical lymphadenitis, who presented to the ear, nose, and throat outpatient department of the Government Medical College Hospital, Chandigarh, India between June 1997 and May 1998 is recorded. Tuberculosis accounted for 60 out of 94 cases of cervical lymph node enlargement. The commonest age group affected was 11-20 years. Constitutional symptoms were not present in most of the patients. Multiple matted nodes were seen in 23 patients but a single discrete node was seen in 18 patients. Upper deep jugular nodes were the most commonly affected lymph nodes. Discharging sinus and abscess formation were uncommon. Fine needle aspiration cytology yielded a positive diagnosis in 52 out of 56 patients. Chest lesions on radiography were evident in 16% of the patients. Mantoux test was positive and was more than 15 mm in most of the patients. This study shows that the classical picture of "scrofula" is no longer seen nowadays and can probably be explained by the earlier presentation of the disease. All the patients were treated with short course daily chemotherapy for six months. Surgery was not required in the majority of patients except in four cases where excision biopsy was performed. Patients with abscess formation were managed with wide bore needle aspiration only. With a minimum six month period of follow up, no patient was found to have a recurrence of local or systemic disease. This study emphasises the role of fine needle aspiration cytology in diagnosis and confirms the efficacy of six months short course chemotherapy.

Adolescent↗
PubMed2001

Avascular necrosis of the hip in children with sickle cell disease and high Hb F: magnetic resonance imaging findings and influence of alpha-thalassemia trait.

Avascular necrosis (AVN) of the hip is a common cause of morbidity in sickle cell disease (SCD). Its prevalence increases with age and predisposing factors include coexistent alpha-thalassemia trait, frequent vaso-occlusive crisis and a high hematocrit (Hct). SCD is relatively mild among Kuwaiti patients because of their elevated Hb F levels, but a subset exists with severe recurrent vaso-occlusive crises. We carried out a prospective magnetic resonance imaging (MRI) study of the hip in a group of patients being followed in the Pediatric Hematology clinics of Al-Mubarak and Al-Amiri Hospitals. The association of AVN with age, frequency of hospitalization, alpha-thal trait, steady-state Hb, Hct, Hb F, WBC and platelet counts was investigated. MRI was carried out with a 1.5-tesla GE unit with a super-conducting magnet. Thirty patients (19 males, 11 females) (23 SS and 7 SbetaThal) were studied. Their ages ranged from 6 to 17 years, with a mean of 9.8 +/- 3.5 years, and Hb F from 11 to 35% with a mean of 22.8 +/- 5.7%. Among the SS patients, 11 (47.8%) had coexistent alpha-thal trait (-3.7-kb deletion). A total of 8 (26.7%) patients (6 SS and 2 SbetaThal) had varying degrees of osteonecrosis of the hip. Four (36.4%) of the 11 SS patients with alpha-thal trait and 2 (16.7%) of those without alpha-thal trait had osteonecrosis. This difference is, however, not statistically significant (chi(2) = 0.3, p = 0.5). While there was also no significant difference in the mean age and hematological parameters (Hb, Hct, Hb F, WBC, platelets), the SS patients with osteonecrosis had a significantly higher number of hospitalizations for vaso-occlusive crisis in the preceding 3 years than those without osteonecrosis.

Adolescent↗
PubMed2001

Body composition, physiological function and psychological changes in patients with predicted severe acute pancreatitis.

BACKGROUND: Serious sepsis and major blunt trauma have adverse effects on body composition, physiological function and psychological state. The effect of severe acute pancreatitis on these groups of variables has not yet been reported. METHODS: We have studied the effect of predicted severe acute pancreatitis (admission APACHE II score > or = 6) on body fat and mid arm muscle circumference (assessed by dual-energy X-ray absorptiometry and anthropometry), respiratory function (measured by spirometry and vitalography), voluntary muscle function (measured by hand dynamometry) and psychological state (measured by use of the hospital anxiety and depression score and visual analogue scale for fatigue) on admission, and three and seven days thereafter. RESULTS: The median APACHE II score of the 15 patients (7 men) in this study was 10 (6-13). The patients showed significant improvement in respiratory function (FEV1 1.3, 1.6, 2.3 litres/s, p < 0.01; FVC 1.5, 2.0, 2.9 litres, p < 0.01; PEFR 304, 372, 409 litres/min, p = 0.01 but no change in voluntary muscle function (210, 205, 213 N, p = 0.41) over the 7-day study period. Psychological state improved in terms of fatigue (2.4, 4.2, 7.0, p < 0.01) and depression (6, 9, 4, p = 0.12) but not in anxiety (8, 6, 7, p = 0.07). Body fat measured by DEXA (17.3 kg on admission, 16.7 kg on day 7, p = 0.13) and the mid upper arm muscle circumference (262, 248, 251 mm, p = 0.10) did not change implying that energy and nitrogen balance over the 7-day study period was achieved. CONCLUSION: Predicted severe acute pancreatitis has an adverse effect on respiratory function and psychological state similar to that observed in serious sepsis. Improvement in these variables is apparent over 7 days of effective treatment. Further research is indicated to examine the effect of nutritional support on these variables.

APACHE↗
PubMed2001

Body composition, muscle function and psychological changes in patients undergoing operation for hepatic or pancreatic disease.

BACKGROUND: There is currently a dearth of data with respect to changes in body composition, physiological function and pSychological state in patients undergoing operative treatment for pancreatic or hepatic disease although marked changes in these variables have been reported in colorectal surgical patients. METHODS: In 36 patients (37 operations) we have studied the effect of a pancreatic or hepatic operation (with and without nutritional support) on body fat and body protein (assessed by Dual energy X-ray absorptiometry (DEXA) and anthropometry), respiratory function (measured by spirometry and vitalography), voluntary muscle function (measured by hand dynamometry) and psychological state (measured by use of the hospital anxiety and depression score and visual analogue scale for fatigue) over a 1-week period postoperatively. RESULTS: On the 3rd postoperative day there were significant changes in: grip strength 307 (135-499) to 249 (85-461) N; FEV1 2.28 (0.48-3.98) to 1.02 (0-2.42) litres/min; FVC 2.90 (0.75-5.02) to 1.28 (0.22-3.31) litres; anxiety score 7 (0-17) to 6 (1-20); depression score 3 (0-10) to 5 (0-20), and fatigue 3.9 (0.4-10) to 6.8 (1.0-9.7). These persisted on day 7 by which time mid-arm circumference and total body fat (by DEXA) had fallen from 30.1 (21.1-45.0) to 29.5 (20.2-43.2) cm, and 20.7 (5.8-53.7) to 20.4 (6.6-53.5) kg, respectively. CONCLUSION: We conclude that operative treatment for pancreatic or hepatic disease has an adverse effect on body composition, physiological function and psychological state.

Adipose Tissue↗
PubMed2001

Intrathoracic kidney in an adult.

An intrathoracic kidney, although rare, should be considered in a patient with a mass at the base of the lung on a chest radiograph. Excretory urography is diagnostic and may eliminate the need for further extensive investigation and operation.

Adult↗
PubMed2001

Dendritic cells genetically engineered to express IL-4 inhibit murine collagen-induced arthritis.

Dendritic cells (DCs) are specialized antigen-presenting cells that migrate from the periphery to lymphoid tissues, where they activate and regulate T cells. Genetic modification of DCs to express immunoregulatory molecules would provide a new immunotherapeutic strategy for autoimmune and other diseases. We have engineered bone marrow-derived DCs that express IL-4 and tested the ability of these cells to control murine collagen-induced arthritis (CIA), a model for rheumatoid arthritis in which Th1 cells play a critical role. IL-4-transduced DCs inhibited Th1 responses to collagen type II in vitro. A single injection of IL-4-transduced DCs reduced the incidence and severity of CIA and suppressed established Th1 responses and associated humoral responses, despite only transient persistence of injected DCs in the spleen. In contrast, control DCs and IL-4-transduced T cells or fibroblastic cells failed to alter the course of the disease. The functional effects correlated well with the differential efficiency of DC migration from various sites of injection to lymphoid organs, especially the spleen. The ability of splenic T cells to produce IL-4 in response to anti-CD3 was enhanced after the administration of IL-4-transduced DCS: These results support the feasibility of using genetically modified DCs for the treatment of autoimmune disease.

Animals↗
PubMed2001

Surgical decisions in the elderly: the importance of biological age.

Surgeons will sometimes advise against an operation because the patient is 'old and frail'. A simple starring system (one to five), based on performance and lifestyle, has been devised to assess the biological age of elderly patients. 10 consultant surgeons and 10 trainees answered questions about their treatment recommendations for hypothetical patients of standard age and medical history but with various star ratings and surgical conditions. 1000 decisions were available for analysis. The four and five star patients (those leading an independent existence) were recommended 266 interventions, the one and two star patients 55. Trainees were more inclined to intervene than consultants, recommending operations in half the patients rather than one-third. These results indicate that decisions on surgical management are strongly influenced by the patient's star rating or biological age. If the starring method proves reproducible in other patient groups and settings, it could allow better communication on an important factor in clinical decisions.

Age Factors↗
PubMed2001

Syphilitic panuveitis and asymptomatic neurosyphilis: a marker of HIV infection.

Co-existing human immunodeficiency virus (HIV) infection can alter the course and presentation of syphilis. Severe ocular manifestations and accelerated natural course of syphilis along with neurosyphilis may be associated with HIV infection. A 30-year-old man is described in whom syphilitic panuveitis and asymptomatic neurosyphilis served as a marker for HIV infection.

Adult↗