Abstract
To study the functional and metabolic correlates of left ventricular hypertrophy [LVH] in non-human primates, 7 hypertensive baboons [papio anubis] with 4.6 ± 0.1 years of hypertension produced by a two-kidney one-clip model, and echocardiographically documented concentric LVH underwent serial phosphorus-31 [P-31] NMR Spectroscopy studies at rest and during inotropic cardiac stress produced by dobutamine infusion [5 μg/kg/minute]. Responses in LVH baboons were compared to those in 5 normotensive, sex and weight-matched control animals. The ratio of P-31 NMR-S derived inorganic phosphates [Pi] to phosphocreatine [PCr] was significantly greater at rest in LVH baboons [0.53 ± 0.06 versus controls = 0.41 ± 0.17; P<0.05]. With dobutamine drug stress, the Pi/PCr ratio rose significantly in LVH baboons [0.77 ± 0.15 versus 0.56 ± 0.16; P<0.05 at 15 minutes]. Despite hemodynamic recovery, the 5 minute post-dobutamine Pi/PCr ratio remained elevated compared to baseline in LVH baboons only [0.78 ± 0.16 versus 0.53 ± 0.06; P<0.05]. In pre-instrumented baboons [n=5], the 'transfer function' of cardiac work [heart rate × LV end-systolic pressure × + dp/dt max] versus Pi/PCr ratio was abnormally shifted rightward and downward [r=0.80] with LVH as compared to the linearly increasing response in controls. We conclude that in vivo P-31 NMR Spectroscopy studies during dobutamine stress demonstrate reduced PCr stores, delayed metabolic recovery following cessation of inotropic stress, and an abnormal rightward shift in the 'transfer function' in LVH baboons.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 57-70 |
| Number of pages | 14 |
| Journal | The International Journal of Cardiac Imaging |
| Volume | 6 |
| Issue number | 1 |
| DOIs | |
| State | Published - Mar 1 1990 |
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Keywords
- cardiac work
- dobutamine
- left ventricular hypertrophy
- oxidative metabolism
- phosphorus-31 NMR spectroscopy
ASJC Scopus subject areas
- Radiological and Ultrasound Technology
- Radiology Nuclear Medicine and imaging
- Cardiology and Cardiovascular Medicine
Cite this
In vivo phosphorus-31 NMR spectroscopy of abnormal myocardial high-energy phosphate metabolism during cardiac stress in hypertensive-hypertrophied non-human primates. / Miller, D. Douglas; Walsh, Richard A.
In: The International Journal of Cardiac Imaging, Vol. 6, No. 1, 01.03.1990, p. 57-70.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - In vivo phosphorus-31 NMR spectroscopy of abnormal myocardial high-energy phosphate metabolism during cardiac stress in hypertensive-hypertrophied non-human primates
AU - Miller, D. Douglas
AU - Walsh, Richard A.
PY - 1990/3/1
Y1 - 1990/3/1
N2 - To study the functional and metabolic correlates of left ventricular hypertrophy [LVH] in non-human primates, 7 hypertensive baboons [papio anubis] with 4.6 ± 0.1 years of hypertension produced by a two-kidney one-clip model, and echocardiographically documented concentric LVH underwent serial phosphorus-31 [P-31] NMR Spectroscopy studies at rest and during inotropic cardiac stress produced by dobutamine infusion [5 μg/kg/minute]. Responses in LVH baboons were compared to those in 5 normotensive, sex and weight-matched control animals. The ratio of P-31 NMR-S derived inorganic phosphates [Pi] to phosphocreatine [PCr] was significantly greater at rest in LVH baboons [0.53 ± 0.06 versus controls = 0.41 ± 0.17; P<0.05]. With dobutamine drug stress, the Pi/PCr ratio rose significantly in LVH baboons [0.77 ± 0.15 versus 0.56 ± 0.16; P<0.05 at 15 minutes]. Despite hemodynamic recovery, the 5 minute post-dobutamine Pi/PCr ratio remained elevated compared to baseline in LVH baboons only [0.78 ± 0.16 versus 0.53 ± 0.06; P<0.05]. In pre-instrumented baboons [n=5], the 'transfer function' of cardiac work [heart rate × LV end-systolic pressure × + dp/dt max] versus Pi/PCr ratio was abnormally shifted rightward and downward [r=0.80] with LVH as compared to the linearly increasing response in controls. We conclude that in vivo P-31 NMR Spectroscopy studies during dobutamine stress demonstrate reduced PCr stores, delayed metabolic recovery following cessation of inotropic stress, and an abnormal rightward shift in the 'transfer function' in LVH baboons.
AB - To study the functional and metabolic correlates of left ventricular hypertrophy [LVH] in non-human primates, 7 hypertensive baboons [papio anubis] with 4.6 ± 0.1 years of hypertension produced by a two-kidney one-clip model, and echocardiographically documented concentric LVH underwent serial phosphorus-31 [P-31] NMR Spectroscopy studies at rest and during inotropic cardiac stress produced by dobutamine infusion [5 μg/kg/minute]. Responses in LVH baboons were compared to those in 5 normotensive, sex and weight-matched control animals. The ratio of P-31 NMR-S derived inorganic phosphates [Pi] to phosphocreatine [PCr] was significantly greater at rest in LVH baboons [0.53 ± 0.06 versus controls = 0.41 ± 0.17; P<0.05]. With dobutamine drug stress, the Pi/PCr ratio rose significantly in LVH baboons [0.77 ± 0.15 versus 0.56 ± 0.16; P<0.05 at 15 minutes]. Despite hemodynamic recovery, the 5 minute post-dobutamine Pi/PCr ratio remained elevated compared to baseline in LVH baboons only [0.78 ± 0.16 versus 0.53 ± 0.06; P<0.05]. In pre-instrumented baboons [n=5], the 'transfer function' of cardiac work [heart rate × LV end-systolic pressure × + dp/dt max] versus Pi/PCr ratio was abnormally shifted rightward and downward [r=0.80] with LVH as compared to the linearly increasing response in controls. We conclude that in vivo P-31 NMR Spectroscopy studies during dobutamine stress demonstrate reduced PCr stores, delayed metabolic recovery following cessation of inotropic stress, and an abnormal rightward shift in the 'transfer function' in LVH baboons.
KW - cardiac work
KW - dobutamine
KW - left ventricular hypertrophy
KW - oxidative metabolism
KW - phosphorus-31 NMR spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=0025633782&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0025633782&partnerID=8YFLogxK
U2 - 10.1007/BF01798433
DO - 10.1007/BF01798433
M3 - Article
C2 - 2149566
AN - SCOPUS:0025633782
VL - 6
SP - 57
EP - 70
JO - International Journal of Cardiovascular Imaging
JF - International Journal of Cardiovascular Imaging
SN - 1569-5794
IS - 1
ER -