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Biomedical subjects

B Pump

Publications and source records attributed to B Pump.

22 records · Page 2Linked to original sources
PubMed1997

Left atrial distension and antiorthostatic decrease in arterial pressure and heart rate in humans.

It was investigated to what degree left atrial distension augments the hypotensive effects of a 15-min moderate antiorthostatic maneuver in humans. Ten healthy males underwent a posture change from upright seated (Seat, legs horizontal) to supine (Sup) or to supine with simultaneous lower body negative pressure (Sup + LBNP) to keep left atrial diameter (LAD) unchanged. After 2.5 min of Sup, mean arterial pressure (MAP) decreased from 94 +/- 3 to 86 +/- 3 mmHg (P < 0.05), whereas a similar decrease was delayed 7.5 min into Sup + LBNP. Heart rate (HR) decreased within 2.5 min of Sup from 68 +/- 2 to 60 +/- 3 beats/min (P < 0.05) and remained significantly decreased for at least 2.5 min longer than during Sup + LBNP. Aortic systolic distension (ASD) increased by 59 +/- 17% during Sup (P < 0.05) but was unchanged during Sup + LBNP. The 29 +/- 4% decrease in plasma norepinephrine (NE) during Sup (P < 0.05) was abolished during Sup + LBNP. In conclusion, the increases in LAD and ASD seem important stimuli for the prompt decrease in MAP, the 2.5-min longer-lasting decrease in HR, and the sustained decrease in NE during a 15-min moderate antiorthostatic posture change in humans.

Adult↗
PubMed1997

Contribution of abdomen and legs to central blood volume expansion in humans during immersion.

The hypothesis was tested that the abdominal area constitutes an important reservoir for central blood volume expansion (CBVE) during water immersion in humans. Six men underwent 1) water immersion for 30 min (WI), 2) water immersion for 30 min with thigh cuff inflation (250 mmHg) during initial 15 min to exclude legs from contributing to CBVE (WI+Occl), and 3) a seated nonimmersed control with 15 min of thigh cuff inflation (Occl). Plasma protein concentration and hematocrit decreased from 68 +/- 1 to 64 +/- 1 g/l and from 46.7 +/- 0.3 to 45.5 +/- 0.4% (P < 0.05), respectively, during WI but were unchanged during WI+Occl. Left atrial diameter increased from 27 +/- 2 to 36 +/- 1 mm (P < 0.05) during WI and increased similarly during WI+Occl from 27 +/- 2 to 35 +/- 1 mm (P < 0.05). Central venous pressure increased from -3.7 +/- 1.0 to 10.4 +/- 0.8 mmHg during WI (P < 0.05) but only increased to 7.0 +/- 0.8 mmHg during WI+Occl (P < 0.05). In conclusion, the dilution of blood induced by WI to the neck is caused by fluid from the legs, whereas the CBVE is caused mainly by blood from the abdomen.

Abdomen↗
PubMed1996

Preoperative lymph-node staining with liposomes containing patent blue violet. A clinical case report.

A case study is reported using patent blue violet entrapped in liposomes to localize lymph nodes before surgery. Liposomes containing 44 mg patent blue violet were injected into foot lymphatics of a patient due to undergo retroperitoneal staging-lymphonodectomy. Lymph nodes were readily visualized and removed, and urine and serum was collected for assay of the dye. The maximum concentration of patent blue violet in serum was 2.7 micrograms mL-1, 1.5 h after the termination of the injection, almost no dye was detectable by the time of the operation 24 h later. In the first urine sample (2 h after the termination of the injection) the concentration of patent blue violet was 1.3 micrograms mL-1, and subsequently diminished, with the last urine sample to contain detectable dye being collected 20 h later. A total of 0.8 mg dye (2% of the injected amount) was excreted in the urine suggesting 10% of the circulating amount of dye was renally excreted. Endolymphatic injection of patent blue violet simplifies the often difficult process of finding the lymph nodes and additionally reduces side-effects. All surgery cases demanding a radical lymphonodectomy may profit, including testicular or bladder cancers and many gynaecological tumours.

Adult↗