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Biomedical subjects

A Taira

Publications and source records attributed to A Taira.

At least 289 records · Page 16Linked to original sources
PubMed1979

Cardia lymph in electrical ventricular fibrillation: an experimental study.

The flow velocity of cardiac lymph during electrical ventricular fibrillation under normothermic cardiopulmonary bypass was studied experimentally in dogs. The time needed for the cardiac lymph node to become stained after injection of dye into the apex myocardium of the left ventricle was measured as an indicator in determining flow velocity of cardiac lymph. The flow velocity was markedly decelerated immediately after the commencement of electrical ventricular fibrillation. It was accelerated, however, after 2 hours of continuous electrical ventricular fibrillation. The difference between the two values was significant (p less than 0.01). Absent contractility of the heart influenced the deceleration of flow velocity of cardiac lymph immediately after the commencement of electrical ventricular fibrillation. Acceleration after 2 hours involved stasis of cardiac lymph as a result of absent contractility and increment of lymph production due to the nonphysiological condition of the myocardium.

Animals↗
PubMed1978

Differential pulse and AC polarography of reserpine, using an aprotic organic solvent system.

Previously demonstrated advantages of aprotic organic solvent for analysis of organic pharmaceuticals have been applied to the assay of reserpine tablets. A procedure using high sensitivity electroanalytical relaxation methods was developed which is simpler and more sensitive than the USP assay. Most data were obtained with a commercial differential pulse polarograph which is widely available. However, less extensive measurements with other instruments established the general applicability of the differential pulse method, as well as various acpolarographic techniques. The results of differential pulse polarographic (DPP) and USP assays of synthetically formulated reserpine tablets compare favorably. The DPP method yields an average recovery for 0.1 mg reserpine/tablet of 100%, with a range of 97.6-102.3%. Corresponding data for 0.25 mg reserpine/tablet are 99.3%, with a range of 97.6-100.6%. Satisfactory results also were obtained in content uniformity studies, using single 0.1 and 0.25 mg tablets.

Polarography↗
PubMed1977

Flow velocity of cardiac lymph and contractility of the heart: an experimental study.

The flow velocity of cardiac lymph in various abnormal conditions of the heart and in control situations was studied experimentally in dogs. The time needed for the cardiac lymph node to become stained after injection of contrast medium into the muscle layer of the left ventricular apex was measured as an indicator in determining flow velocity of cardiac lymph. Left ventricular contractility was studied simultaneously. The hypoxic dogs had a short staining time with a vigorous cardiac beat. (Short staining time means accelerated lymph flow through the heart). The hearts in which the coronary sinus was ligated revealed the shortest staining time with an insignificant contractile change. The exsanguinating dogs had a long staining time with reduced contractility. The dogs with ventricular fibrillation had the longest staining time. When the heart rate was fixed by pacing, the staining time reflected contractile change. The contractile force of the heart plays an important role in the flow velocity of cardiac lymph.

Animals↗
PubMed1976

Patch closure of the ductus arteriosus: an improved method.

An improved surgical procedure for patch closure of the ductus arteriosus under cardiopulmonary bypass is presented. A patch with a Fogarty catheter inserted through its center is used. The catheter is insinuated into the aorta through a pulmonary arteriotomy under normothermic cardiopulmonary bypass. An inflated intraaortic balloon is made to plug the orifice of the ductus using gentle traction on the catheter. The catheter may be slanted in any direction that is convenient to provide satisfactory visualization of the operative field.

Aorta, Thoracic↗
PubMed1976

Cardiac lymph and contractility of the heart.

The transport mechanism of cardiac lymph with reference to the contractility of the heart was studied experimentally using a dye technique. An augmentation of cardiac contractility with or without hypoxia of the heart equally accelerated the transportation of cardiac lymph. The short staining time of the "cardiac node" correlated well to the augmented contractility of the heart and the long to the decreased contractility. Similar result was obtained in the dogs with surgical block and pacing at a rate of 100/min. This experiment suggests the importance of dynamical observation of cardiac lymph.

Animals↗