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Biomedical subjects

O Prakash

Publications and source records attributed to O Prakash.

At least 91 records · Page 5Linked to original sources
PubMed1990

Evaluation of beneficial effects of nonnutritive sucking in preterm infants.

The effects of nonnutritive sucking (NNS) were studied in 40 preterm infants weighing less than or equal to 1800 g and of less than or equal to 35 weeks gestation by using a pacifier. The provision of NNS accelerated the maturation of sucking resulting in a faster transition from gavage to oral feedings. Treated infants (20) were ready for bottle feeds 1.54 days earlier, took their bottle feeds 1.5 min/30 ml faster and were transferred out of the nursery on an average .5 days earlier than the control infants. No adverse effects due to NNS were observed throughout the period of study. This resulted in an earlier union with their mother, less maternal deprivation and decreased work load on the nursery staff. Used judiciously this simple and safe modality of providing a pacifier for NNS during tube feeding may be useful in the management of preterm infants.

Body Weight↗
PubMed1989

Influence of endosperm texture on milling, chemical composition and nutritive quality in maize.

Three maize varieties namely Vijay, SO/SN composite and Shakti, which differ in their nutritional quality and endosperm texture were processed to prepare semolina (sooji) and process-flour. The nutritional quality of these products was determined and compared with whole kernel flour of the respective variety. Distinct differences in milling and chemical composition of three varieties were recorded. In quality evaluation tests lysine and tryptophan content, biological value and true digestibility were better in semolina and process-flour. Moreover, decrease in acid value in semolina and process-flour compared with whole maize flour recorded in all the varieties suggested improvement in shelf-life.

Animals↗
PubMed1989

A new approach: reusable real-time database for medical instrumentation applications.

Medical instrumentation (MI) software development work differs from other software development works mainly in the testing and validation phase. For MI software, this phase has always been most difficult, time-consuming and yet the most doubted phase. The primary reason being the input to these programs (ie) the physiological signals like ECG, pulse, etc. To be more specific, the problem is because 1. These physiological signal patterns vary so widely from person to person and hence these programs have to be validated statistically on all categories of persons including those on the extreme ends. 2. There are also artifacts riding on these signals (inherent, intentional or due to inevitable physical movements) 3. These signals are real-time ones to the order of a second. Above all, 4. They are not reproducible patterns, if you need them for study and analysis at a later date. Though it is tough to find alternatives for the present technique of statistical validation, there can be ways to make use of this time-consuming validation process to its fullest potential. One such way is to make a kind of 'CAPTURE-RETAIN AND REUSE' databases that can reduce the future efforts in the validation phase substantially. The main areas where these databases can make vital contributions are: 1. Medical Instrumentation software testing and validation 2. Medical Instruments' results and performance comparison 3. Expert system building, testing and enhancement of its capabilities.

Evaluation Studies as Topic↗
PubMed1989

Nitrous oxide does not induce myocardial ischemia in patients with ischemic heart disease and poor ventricular function.

Despite evidence from animal experiments to the contrary, nitrous oxide (N2O) reportedly does not induce myocardial ischemia when used as an adjunct to fentanyl anesthesia in patients with coronary artery disease who have well-preserved left ventricular (LV) function. However, the incidence of ischemia with N2O administration in similar patients with poor LV function may be different. The effects of N2O on segmental LV function, as determined by two-dimensional transesophageal echocardiography, changes in the ST-segment of the electrocardiogram were compared with the effects of an equal concentration of nitrogen (N2) (crossover design) in 70 patients who required elective coronary artery bypass grafting. Of these patients, 24% had left ventricular ejection fraction (LVEF) less than or equal to 40%. Myocardial ischemia was diagnosed in 14 patients during the study: four while awake, seven during induction of anesthesia and tracheal intubation, and four during the remainder of the study (one during N2O and three during 100% oxygen; one patient had two distinct periods of ischemia). No value for LVEF could be found that would distinguish between patients who did or did not have ischemia during the study. Patients treated with beta-adrenergic blocking drugs preoperatively were less likely to develop ischemia (P less than 0.05). Preoperative calcium channel blockers made no such differences. Onset of ischemia was not closely associated with hemodynamic changes. Thus, N2O does not induce clinically detectable myocardial ischemia in patients who have coronary artery disease, and poor LV function in situations in which the effects of deepening anesthetic depth and mild depression of global myocardial function are deemed desirable or harmless.

Adult↗
PubMed1989

Prescription audit of under six children living in periurban areas.

One hundred and seventy two children were prescribed, in 212 episodes of illness, antimicrobial agents (28.4%), followed by antidiarrheals (10.9%), nutritional products (9.4%), analgesics (7.5%) and steroids (6.8%). Ampicillin (22.7%) and cotrimoxazole (12.7%) were the most commonly prescribed antimicrobials. Tetracyclines, which are not indicated in children below 8 years, were used in 7.1% of total exposures of chemotherapeutic agents. Penicillin, a comparatively safe and useful drug, was used only in 4.5% exposures. Analgin and hydroxyquinolines were used frequently. Corticosteroids were used for simple ailments like diarrhea, fever and jaundice. ORS was used in only 13.9% episodes of diarrhea. Adverse drug reactions were noted in 30 (17.4%) cases and death in 6 (3.5%) cases. The average cost per prescription for neonates was Rs 32.43 and for a child was Rs 30.65. Weight of the children was not taken prior to prescribing drugs. There is need for prescription audit as there is high consumption rate of drugs, with overuse of antimicrobial and nutritional products, and misuse of steroids.

Child↗
PubMed1988

Epidural sufentanil for intra- and postoperative analgesia in thoracic surgery: a comparative study with intravenous sufentanil.

A comparative study was undertaken to evaluate the effectiveness of epidural sufentanil in providing intra- and postoperative analgesia during thoracic surgery. Sufentanil was chosen on the basis of its high lipid solubility and its potent opiate receptor binding. Epidural sufentanil was compared with intravenous sufentanil as the major intraoperative analgetic agent in an anesthesia regimen with midazolam and nitrous oxide. Epidural sufentanil significantly decreased the need for supplementary intravenous analgesia. In the epidural sufentanil group the immediate postoperative analgesia was found to be better, with a longer duration of action, compared with the intravenous sufentanil group. Postoperatively epidural sufentanil was compared with epidural morphine. Sufentanil provided good analgesia with a very fast onset and a mean duration of almost 7 h. Severe respiratory depression was observed in one patient within 1 h of extubation, probably due to the combined effects of the narcotic administration and residual midazolam. It is concluded that 50 micrograms of sufentanil administered in the thoracic epidural space provides valuable intraoperative analgesia which can easily be extended into the postoperative period, although all necessary precautions for epidural opiate administration should be taken.

Adult↗
PubMed1987

Structural alterations in the long terminal repeat of an acquired mouse mammary tumor virus provirus in a T-cell leukemia of DBA/2 mice.

ML, a transplantable T-cell leukemia of DBA/2 mice, expresses the gag and env gene products of the murine mammary tumor virus (MuMTV). Analysis of the genomic DNA of ML cells using the restriction enzyme HindIII and hybridization with MuMTV-specific probes revealed that the ML cells contained two or more newly integrated MuMTV proviruses (ML-MuMTV). Further analysis of these proviruses with a combination of Mspl and Pstl enzymes showed that the long terminal repeat (LTR) (ML-MuMTV LTR) of the ML-MuMTV provirus(es) was structurally different from the LTRs of both exogenous and endogenous MuMTV proviruses of DBA/2 mice. In order to characterize the nature of the structural alterations in the ML-MuMTV LTR, we cloned a 4.0-kb HindIII fragment containing the 3' half of an acquired provirus. Sequence analysis of the ML-MuMTV LTR of this acquired provirus revealed a deletion of a 387-bp segment that maps between the 5' nucleotide 616 and the 3' nucleotide 1003 of the normal MuMTV LTR and duplication of a 102-bp fragment that mapped between 514 and 616. In addition to two point mutations in the direct repeat, the proviral ML-MuMTV LTR has also acquired 9- and 7-bp segments at the 5' and 3' sites of the duplicated 102-bp segment, respectively. Since direct repeats in the U3 regions of a number of LTRs have been found to be associated with enhancer function, we examined the enhancer function of the U3 region sequences of the ML-MuMTV LTR using enhancer-dependent transient expression assay of chloramphenicol acetyltransferase (CAT) gene in NIH 3T3 cells. Our studies have shown that the U3 region sequences of the rearranged ML-MuMTV LTR have the ability to enhance the expression of the CAT gene 12- to 15-fold more than the U3 region sequences from the normal MuMTV LTR. The presence of a direct repeat in the ML-MuMTV LTR and its ability to enhance the transcription of adjacent genes is analogous to the LTRs of certain murine leukemia viruses.

Animals↗
PubMed1987

Addition of nitrous oxide to fentanyl anesthesia does not induce myocardial ischemia in patients with ischemic heart disease.

Although nitrous oxide is commonly administered to patients with ischemic heart disease, recent reports suggest that it may induce myocardial ischemia in these patients. The authors compared the effects of nitrous oxide on segmental left ventricular (LV) function and the ST segment of the electrocardiogram with the effects of an equal concentration of nitrogen (crossover design) before the start of surgery in 18 patients who required coronary-artery bypass grafting. The patients studied did not have valvular or LV dysfunction. Anesthesia was induced and maintained with intravenous fentanyl. After endotracheal intubation and 20 min of ventilation with 100% oxygen, either 60% nitrous oxide or 60% nitrogen (randomly assigned) was added to the inspired gas mixture of each patient for 10 min. This was followed by 10 min of 100% oxygen, and then 10 min of 60% nitrous oxide or 60% nitrogen, whichever had not been administered previously. Patients were monitored for myocardial ischemia using a standard 12-lead electrocardiogram and trans-esophageal two-dimensional echocardiography. Surgery did not begin until the study was concluded. No patient experienced an ST segment change greater than 1 mm during the study, and none developed a new segmental wall motion abnormality during inhalation of either nitrous oxide or nitrogen. The authors conclude that nitrous oxide does not induce myocardial ischemia when used as an adjunct to fentanyl anesthesia in patients who have severe coronary-artery disease accompanied by well-preserved valvular and LV function.

Adult↗
PubMed1987

Hypothermia and acid-base regulation in infants.

During progressive hypothermia for cardiac surgery, the need for advanced and comprehensive physiological monitoring systems is even more apparent and vital. A review of the literature on the physiological effects of hypothermia in animals reveals that the "physiological neutrality" intracellularly is achieved at progressively higher pH values as temperature falls, and that this more alkaline acid-base balance is apparently achieved while the total carbon dioxide content of the tissues remains at normothermic (normal body temperature) levels. Based on this, an anesthetic technique was studied, whereby the ventilation was maintained throughout the cooling/surgery/rewarming cycle at normothermic levels. This allowed a progressively more alkaline acid-base environment to be achieved. This technique is discussed in detail, together with information relating to the circulatory changes and complications seen and the degree of acid-base control obtained. The conclusion is drawn that the addition of carbon dioxide to the ventilation gases, of alternatively, a decrease in ventilation as temperature falls, is not only unnecessary, but perhaps also harmful.

Acid-Base Equilibrium↗