What question did this study set out to answer?

To evaluate the specific contribution of chloride to sodium- and potassium-induced renin inhibition by comparing the effects of chloride versus bicarbonate salts in salt-deprived rats.

October 1, 1976American Journal of Physiology-Legacy Content

Failure of NaHCO3 and KHCO3 to inhibit renin in the rat

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To evaluate the specific contribution of chloride to sodium- and potassium-induced renin inhibition by comparing the effects of chloride versus bicarbonate salts in salt-deprived rats.
Compared 9-day oral intake of isotonic NaCl versus NaHCO3 and dietary loading of KCl versus KHCO3 (5 meq K+/10 g diet) in NaCl-deprived rats.
Conducted acute intravenous volume expansion using isotonic NaCl or NaHCO3 infusions.
Measured plasma renin activity (PRA), renal renin content (RRC), sodium balance, and potassium balance.
Chronic NaCl loading suppressed PRA (16.5 ± 4.4 vs. 44.8 ± 4.7 ng/ml per h, P < 0.005) and RRC (P < 0.02) compared to NaCl deprivation, whereas NaHCO3 loading did not (PRA: 57.2 ± 9.8 ng/ml per h).
Dietary KCl significantly decreased both PRA and RRC compared to controls (P < 0.01), while KHCO3 failed to inhibit either parameter.
Acute IV expansion with NaCl reduced PRA more effectively than NaHCO3 (11.8 ± 3.8 vs. 29.7 ± 8.5 ng/ml per h, P < 0.05) despite similar plasma volume expansion (P > 0.05).

Structured PICO

Population

NaCl-deprived rats

Intervention

NaHCO3 or KHCO3 loading (isotonic drinking for 9 days or acute intravenous expansion)

Comparator

NaCl or KCl loading, and NaCl-deprived controls

Outcome

Plasma renin activity (PRA) and renal renin content (RRC)surrogate

The failure of NaHCO3 and KHCO3 to inhibit renin suggests that chloride plays a key role in mediating renin responses to sodium and potassium.

Discussion

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Implication

Animal data implicate chloride in salt-mediated renin suppression; extends mechanistic insights but leaves open clinical relevance in humans.

Cite This Study

Kotchen et al. (1976) studied this question.

synapsesocial.com/papers/6a83dd59b0b8dfdc4c62dd0e https://doi.org/10.1152/ajplegacy.1976.231.4.1050

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Implication

Animal data implicate chloride in salt-mediated renin suppression; extends mechanistic insights but leaves open clinical relevance in humans.

Failure of NaHCO3 and KHCO3 to inhibit renin in the rat

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Failure of NaHCO3 and KHCO3 to inhibit renin in the rat

Key Points

Structured PICO

Discussion

Implication

Cite This Study

Also Consider

Also Consider