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Biomedical subjects

D Mahapatra

Publications and source records attributed to D Mahapatra.

7 recordsLinked to original sources
PubMed2004

Karyotype analyses and studies on the nuclear DNA content in 30 genotypes of potato (Solanum tuberosum) L.

The cytophotometric estimation of 4C DNA content, and karyotypic and somatic chromosome number analyses were carried out in 30 genotypes comprising seven cultivars and 23 advanced breeding lines of Solanum tuberosum. Detailed karyotype analysis revealed genotype specific chromosomal characteristics and structural alterations in chromosomes of the genome, with a rare phenomenon of aneusomatic (2n = 4x + 2 = 50) condition in cv.K. Chandramukhi. The origin of this variation could be attributed to mitotic non-disjunction in the shoots giving rise to aneusomatic roots. Highly significant variations in the genome length, volume and total form percentage were noted at the cultivar level. The total chromosome length varied from 84.56 microm in cv.K. Pukhraj to 127.62 microm in MS/89-60, with an average value of 100.94 microm +/- 1.82. Total chromosome volume varied from 57.22 microm3 in MS/92-1090 to 132.64 microm3 in JW-160. Significant variations in the 4C DNA content (7.28-15.83 pg) were recorded at the cultivar level, with an exceptionally high DNA content (22.24 pg) in cv.K. Chandramukhi. This could be due to the aneusomatic condition of this genotype. Correlation studies revealed interdependence between the chromosomal and nuclear parameters of the genotypes. Structural alterations in the chromosomes, as well as loss or addition of highly repetitive sequences in the genome, caused variations in DNA content at the cultivar level. Variations in genomic structure and nuclear DNA content of the 48-chromosome genotypes suggest a genetic drift during microevolution, leading to the development of new cultivars.

Cell Nucleus↗
PubMed1987

Clinical experience with a transdermal nitroglycerin system.

Forty-seven patients with chronic stable angina pectoris entered a thirteen-week open-label study with a transdermal therapeutic system of nitroglycerin in order to evaluate its clinical efficacy, safety, and patient acceptance. In 19 patients, a beta-blocker and in 17 patients a calcium-channel blocker were continued throughout the study period without alteration of their doses. The study consisted of a two-week run-in period and an eleven-week active drug period. Acute titration was done with nitroglycerin patches on the basis of weekly patient diaries on frequency of angina and sublingual nitroglycerin consumption. Overall, reductions in frequency of angina and in nitroglycerin consumption were statistically significant (p less than 0.05). Adverse reactions were common but tolerable. The reported side effects were headache in 32, skin rash in 18, dizziness in 10, palpitation and itching in 9 each, nausea in 7, flushing in 3, and vomiting in 1 patient. In conclusion, the present study demonstrates that individual dose titration with nitroglycerin patches for obtaining significant antianginal effect is essential. The present therapeutic system is convenient to use and well tolerated and had acceptable side effects in our study population.

Administration, Cutaneous↗
PubMed1986

Efficacy and safety of oral tocainide in refractory ventricular arrhythmia: a preliminary report on an open label study.

The preliminary data on efficacy and safety of oral tocainide in refractory ventricular dysrhythmia in 8 patients is described. Two patients died; one within 15 days and the other after 1750 days of continuous tocainide therapy. The cause of death in both patients was unclear. During initial administration and acute titration, oral tocainide was extremely effective in lidocaine-sensitive ventricular dysrhythmia and in patients with Q-T prolongation syndrome. Four out of 8 patients received tocainide in presence of left ventricular dysfunction and 2 out of 4 such patients died suddenly. Minor central nervous system side effects were seen in 2 patients and dermatologic adverse reaction was seen in one patient only.

Aged↗
PubMed1986

Cardiovascular effects of polycyclic antidepressants.

Every day, thousands of people in the United States receive polycyclic antidepressants (PCAs) prescribed by their primary care physicians. We have examined the cardiovascular manifestations of polycyclic antidepressants in 14 patients with primary depression receiving various antidepressant drugs for a period of six months or more. None had suffered from any systemic illness. All 14 received a commonly prescribed PCA, such as doxepin, amitriptyline, imipramine, desipramine or amoxapine, in therapeutic doses. None developed any significant adverse reaction. Left ventricular function, as determined by M-mode echocardiogram, was within normal limit in all patients. A twenty-four-hour ambulatory electrocardiogram revealed rare supraventricular ectopic beats in 8 patients and ventricular ectopic activity (Lown grade 1) in 4 patients. In 1 patient, who received additional lithium carbonate for treatment of depression, both supraventricular and ventricular ectopic activity developed on rare occasions. In 4 of the 8 patients the plasma concentration of PCA was optimal or near optimal, and in 4 of the 8 patients it was subtherapeutic (even though these 4 patients had shown clinical improvement with continued polycyclic therapy). It appears from the present data that antidepressant therapy with PCAs prescribed in therapeutic doses was well tolerated, without any significant adverse cardiovascular reaction, in otherwise healthy young patients with primary depression.

Adult↗
PubMed1986

Acute titration and chronic follow-up with captopril in hypertension. A one-year safety profile on combination therapy with captopril and a diuretic.

The present study examines acute titration with captopril and chronic follow-up data on captopril and a diuretic in patients with all forms of hypertension. Captopril was initiated in those patients in whom previous antihypertensive agents either failed to control high blood pressure or produced adverse reactions. Acute titration was done in 88 patients in whom average diastolic blood pressure was equal to or more than 95 mm Hg. Initial titration dosage was decided on the basis of initial blood pressure recordings. During initial titration, 5 patients received 12.5 mg, 51 received 25 mg, 28 received 50 mg, and the remaining 4 received 100 mg of captopril. Post-captopril blood pressure data were normalized by using pre-captopril data as 100% for each patient. The blood pressure-lowering effect of captopril on both systolic and diastolic blood pressure in all 88 patients was statistically significant (p less than 0.05), within forty-five minutes of captopril administration irrespective of the doses. No adverse reactions were seen during the acute titration. After the initial titration, in all 88 patients a diuretic was added to obtain a synergistic effect. Eleven patients were dropped from the study, for they could not follow the requirements of the protocol. In 77 patients the data for a one-year safety profile with captopril and diuretic were available. There were no overall significant statistical changes in serial white blood cell count, serum potassium, and serum creatinine values in those 77 patients. In 31 patients the initial and maintenance dosage of captopril and the diuretic remained unaltered for one year. Post-captopril blood pressure and heart rate data were normalized, pre-captopril data being considered as 100% in those 31 patients. The blood pressure data following captopril and a diuretic therapy compared with the pre-captopril data were statistically significant (p less than 0.05) throughout the study period. However, no significant changes in heart rates were observed during the study period. In all other patients, diuretic therapy was continued throughout the study period. In 6 severely hypertensive patients, an additional beta-blocker was needed for further control of high blood pressure. In 3 severe hypertensives with renal failure, besides a diuretic and a beta-blocker, minoxidil was needed to normalize their high blood pressure. In 4 of 77 patients, verapamil was used for treatment of either vasospastic angina or paroxsysmal supraventricular arrhythmia.(ABSTRACT TRUNCATED AT 400 WORDS)

Adrenergic beta-Antagonists↗