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Biomedical subjects

N Hugo

Publications and source records attributed to N Hugo.

62 records · Page 4Linked to original sources
PubMedDate not supplied

The effect of intravenous administration of melatonin on cardiovascular parameters of the baboon (Papio ursinus).

Melatonin (0.3 to 0.4 mg/kg) dissolved in 0.5 ml dimethylsulphoxide (DMSO) was injected i.v. into six baboons, and their cardiovascular parameters were monitored. Left ventricular end-diastolic and end-systolic volumes, stroke volume, cardiac output, and left ventricular ejection fraction were measured, using conventional radionuclide ventriculography, and compared to normal values previously established. These parameters were also measured after an i.v. administration of only DMSO. The only statistical significant change due to melatonin was the increase in the cardiac output and left ventricular ejection fraction. With the reduced heart rate the increase in cardiac output implies a positive inotropic action on the heart by melatonin. There are indications that DMSO possibly suppresses cardiovascular actions of melatonin.

Animals↗
PubMedDate not supplied

[Systemic inflammatory response syndrome and primary of spontaneous intracerebral haemorrhage].

OBJECTIVE: Systemic inflammatory response syndrome (SIRS) without infection is a well known phenomenon that accompanies various acute cerebral insults. We in tented to determine whether SIRS was associated with outcome in patients with spontaneous intracerebral hemorrhage. PATIENTS AND METHODS: In patients with intracerebral hemorrhage, the occurrence of SIRS was assessed according to the guidelines of the 1992 Consensus Conference. SIRS criteria and other prognostic parameters were evaluated as predictors of final outcome. RESULTS: SIRS was highly related to poor clinical grade (Glasgow coma scale), hemorrhage volume on CT scan and intraventricular extension of hemorrhage. By univariate analysis,the occurrence of SIRS was associated with higher mortality and morbidity rates than was the nonoccurrence (p<0.005). CONCLUSIONS: In patients with intracerebral hemorrhage, SIRS reflected the extent of tissue damage and predicted a poor outcome.

Adult↗
PubMedDate not supplied

Cardiac function and Fourier phase data from simulated Wolff-Parkinson-White syndrome in a baboon model.

The diagnostic value of Fourier phase analysis and planar scintigraphy in Wolff-Parkinson-White (WPW) syndrome has been suspect. This study investigates phase analytical data from planar radionuclide ventriculography of six baboons with simulated WPW syndrome by means of implanted electrodes. An electrode in the atrium controlled the heart rate and a subsequent stimulation was delivered by electrodes placed at different sites on the ventricles, delayed to cause the characteristic delta wave of the WPW syndrome. Sensitivity for accurately-localizing variously-situated first points of activation (FPAs) from the Fourier phase images was found highest for premature right ventricular (RV) activation, and for atrioventricular (AV) delays around 125 msec. Other sites were subject to artifacts. Changes in cardiac function, phase delay, and histogram parameters were not statistically meaningful.

Animals↗
PubMedDate not supplied

Prostaglandin E1 and papaverine: a comparative study on the ability to increase the penile bloodpool as measured by the 99mTc-penogram in the baboon model.

The evaluation of arterial blood supply and venous drainage of the penis is essential in assessing the impotent male. The vaso-active drugs prostaglandin E1 and papaverine, as intracavernous injections, cause penile erections in humans by influencing the arterial blood supply and venous drainage. These drugs were used in the normal baboon and in vascular compromised baboons using a 99mTc-penogram to quantify the vascular status of the penis. Ligation of the A. Iliaca Interna was performed to change the penile blood supply, thus compromising the vascular supply. It was observed that pre- and post-operatively, the increase in the penile bloodpool was more dramatic although not significantly so (P less than 0.05), but more variable after papaverine than with prostaglandin E1. The effect was even more enhanced (P less than 0.05) in the vascular compromised baboons so that the occurrence of priapism after papaverine can speculatively not be excluded. Also the more consistent vasoactive response after prostaglandin E1 seems to establish it as the superior intracavernous injectable agent.

Alprostadil↗
PubMedDate not supplied

Thiol reduction-mediated 99mTc-IgG for scintigraphy of inflammatory lesions in the baboon model.

Radiolabeling procedures may modify the structure of the Fc portion of the immunoglobulin molecule in such a way that its in vivo immunological behavior may be altered and its efficacy as radiopharmaceutical for inflammatory lesions impaired. This study tested the efficacy of thiol reduction-mediated 99mTc human IgG for scintigraphy of focal inflammatory lesions, either bacterially or chemically induced and located either in the abdominal/thoracical region or in the thigh of baboons. Positive images were obtained in the thigh lesions between 4 and 7 hr after i.v. administration of the labeled IgG. The abdominal/thoracic lesions were never very clear, mostly because of very hot kidneys. Late visualization (20 hr) of all lesions was poor and a high background was present. Bacterially induced lesions were better visible, although no neutrophil nor monocyte activity could be established in the mechanism of the IgG localization.

Animals↗