What question did this study set out to answer?

The aim is to determine how nitric oxide affects renal vascular resistance and blood flow regulation in preglomerular arterioles.

June 1, 1992Hypertension

Nitric oxide modulates vascular tone in preglomerular arterioles.

Q: What does this research mean for the field?

Nitric oxide modulates vascular tone in the interlobular artery and afferent arterioles of deep nephrons, influencing the preglomerular vasculature's ability to autoregulate glomerular capillary pressure. Novelty: ClaimNovelty.NOVEL_FINDING. Consensus alignment: ConsensusAlignment.NEUTRAL.

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Why the study?

Does N omega-nitro-L-arginine alter the pressure-diameter relation and vascular tone of renal arterioles in a rat juxtamedullary microvascular preparation?

Population

Rat juxtamedullary microvascular preparation perfused in vitro with a physiological salt solution containing…

Comparison

N omega-nitro-L-arginine, an inhibitor of nitric… vs Baseline conditions and reversal with L-Arginine

Design

Preclinical

Authors

JIJohn D. ImigVascular Medicine RRR. J. RomanUniversity of Mississippi Medical Center

Discussion

Member takes

Implication

Nitric oxide modulates rat renal arteriolar tone and autoregulation; hypothesis-generating for human hypertension, should not change practice.

Key Points

The aim is to determine how nitric oxide affects renal vascular resistance and blood flow regulation in preglomerular arterioles.
Used N omega-nitro-L-arginine (100 µM) to inhibit nitric oxide synthesis in an in vitro renal microvascular preparation.
Examined pressure-diameter relations of various renal arterioles at different perfusion pressures.
Measured the effects of L-arginine (1 mM) on reversing the inhibition caused by nitro-arginine.
Basal diameters measured as follows: arcuate arteries 438 ± 26 µm, interlobular arteries 64 ± 4 µm, proximal afferent arterioles 30 ± 1 µm, and distal afferent arterioles 20 ± 1 µm at 80 mm Hg.
Nitro-arginine reduced afferent arterioles' diameters by 7 ± 2% across all pressures, while supporting autoregulation of glomerular capillary pressure.
L-arginine completely reversed the changes caused by nitro-arginine.

Structured PICO

Does N omega-nitro-L-arginine alter the pressure-diameter relation and vascular tone of renal arterioles in a rat juxtamedullary microvascular preparation?

Population

Rat juxtamedullary microvascular preparation perfused in vitro with a physiological salt solution containing 5% albumin

Intervention

N omega-nitro-L-arginine (100 microM), an inhibitor of nitric oxide synthesis

Comparator

Baseline conditions and reversal with L-Arginine (1 mM)

Outcome

Pressure-diameter relation of renal arterioles (arcuate, interlobular, and afferent arterioles)surrogate

Nitric oxide modulates vascular tone of the interlobular artery and afferent arterioles of deep nephrons, influencing the preglomerular vasculature's ability to autoregulate glomerular capillary pressure.

Cite This Study

Imig et al. (1992) studied this question.

synapsesocial.com/papers/6a1ec40dbf2a5d44faaf4ac5 https://doi.org/10.1161/01.hyp.19.6.770

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June 1, 1992Hypertension

Nitric oxide modulates vascular tone in preglomerular arterioles.

View Full Paper

Ask AI

Bookmark

Why the study?

Does N omega-nitro-L-arginine alter the pressure-diameter relation and vascular tone of renal arterioles in a rat juxtamedullary microvascular preparation?

Population

Rat juxtamedullary microvascular preparation perfused in vitro with a physiological salt solution containing…

Comparison

N omega-nitro-L-arginine, an inhibitor of nitric… vs Baseline conditions and reversal with L-Arginine

Design

Preclinical

Authors

JIJohn D. ImigVascular Medicine RRR. J. RomanUniversity of Mississippi Medical Center

Discussion

Member takes

Implication

Nitric oxide modulates rat renal arteriolar tone and autoregulation; hypothesis-generating for human hypertension, should not change practice.

Key Points

The aim is to determine how nitric oxide affects renal vascular resistance and blood flow regulation in preglomerular arterioles.
Used N omega-nitro-L-arginine (100 µM) to inhibit nitric oxide synthesis in an in vitro renal microvascular preparation.
Examined pressure-diameter relations of various renal arterioles at different perfusion pressures.
Measured the effects of L-arginine (1 mM) on reversing the inhibition caused by nitro-arginine.
Basal diameters measured as follows: arcuate arteries 438 ± 26 µm, interlobular arteries 64 ± 4 µm, proximal afferent arterioles 30 ± 1 µm, and distal afferent arterioles 20 ± 1 µm at 80 mm Hg.
Nitro-arginine reduced afferent arterioles' diameters by 7 ± 2% across all pressures, while supporting autoregulation of glomerular capillary pressure.
L-arginine completely reversed the changes caused by nitro-arginine.

Structured PICO

Does N omega-nitro-L-arginine alter the pressure-diameter relation and vascular tone of renal arterioles in a rat juxtamedullary microvascular preparation?

Population

Rat juxtamedullary microvascular preparation perfused in vitro with a physiological salt solution containing 5% albumin

Intervention

N omega-nitro-L-arginine (100 microM), an inhibitor of nitric oxide synthesis

Comparator

Baseline conditions and reversal with L-Arginine (1 mM)

Outcome

Pressure-diameter relation of renal arterioles (arcuate, interlobular, and afferent arterioles)surrogate

Cite This Study

Imig et al. (1992) studied this question.

synapsesocial.com/papers/6a1ec40dbf2a5d44faaf4ac5 https://doi.org/10.1161/01.hyp.19.6.770

Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

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