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Diminished vasoconstrictive function caused by long-term nonpulsatile left heart bypass
T Nishimura1, E Tatsumi, T Nishinaka
1Department of Artificial Organs, National Cardiovascular Center Research Institute, Suita, Osaka, Japan.
Artificial Organs
|August 27, 1999
Summary
Prolonged nonpulsatile left heart bypass (NPLHB) in goats impaired vascular constrictive function. The vascular system
Area of Science:
- Cardiovascular Physiology
- Vascular Biology
- Biomedical Engineering
Background:
- Left heart bypass (LHB) is a critical intervention for cardiac support.
- Understanding the systemic vascular effects of different LHB modes is essential.
Purpose of the Study:
- To investigate the impact of prolonged nonpulsatile left heart bypass (NPLHB) on systemic vascular function.
- To assess changes in vascular constrictive response under NPLHB.
Main Methods:
- Adult goats underwent pulsatile left heart bypass (PLHB) followed by 4 weeks of NPLHB.
- Systemic vascular resistance (SVR) and plasma norepinephrine levels were measured.
- Vascular constrictive response (deltaSVR) to norepinephrine injection was evaluated.
Main Results:
- Systemic vascular resistance and plasma norepinephrine levels remained stable.
- The constrictive response (deltaSVR) to norepinephrine significantly decreased during prolonged NPLHB.
- This diminished response was evident by the third and fourth weeks of NPLHB.
Conclusions:
- Prolonged NPLHB significantly impairs the constrictive function of the systemic vascular system.
- The findings suggest potential long-term vascular maladaptations associated with NPLHB.