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- W2047935532 abstract "Heart-lung transplantation results in afferent and efferent denervation of the transplanted organs including interruption of the central connections from the low-pressure receptors in the atria and pulmonary veins. We investigated whether the cardiovascular and neurohumoral responses to the postural stimulus of head-up tilt were affected after transplantation. Responses in eight heart-lung transplant recipients were studied and compared with those in eight normal subjects matched for age and sex during passive head-up tilt at 45 degrees for 1 hour. The transplant group had a higher initial heart rate (99 +/- 2 versus 68 +/- 2 beats/min, p less than 0.001) and diastolic blood pressure (88 +/- 5 versus 76 +/- 2 mm Hg, p less than 0.05) than did the control group. The increases in heart rate and diastolic blood pressure during head-up tilt were similar in the two groups. Systolic blood pressure remained unchanged. The decrease in cardiac output (30% versus 18%, p less than 0.05) and the increase in systemic vascular resistance (52% versus 28%, p less than 0.05) were greater in the transplant group. Baseline levels of norepinephrine, epinephrine, vasopressin, and plasma renin activity were similar in the two groups. Atrial natriuretic peptide concentrations were higher in the transplant group (26 +/- 3.8 versus 9.7 +/- 1.6 pmol/l, p less than 0.001). During head-up tilt, plasma norepinephrine levels increased to a greater extent in the transplant group than in the control group (83% versus 53%, p less than 0.01), indicating an increased sympathetic response. In contrast, plasma renin activity increased significantly in the control group but not in the transplant group.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2047935532 date "1990-09-01" @default.
- W2047935532 modified "2023-10-06" @default.
- W2047935532 title "Altered cardiovascular and neurohumoral responses to head-up tilt after heart-lung transplantation." @default.
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- W2047935532 doi "https://doi.org/10.1161/01.cir.82.3.863" @default.
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