Key result
Reduced vagal CAP amplitude strongly correlates with greater glomerular injury in severe SAH rabbits.
Why the study?
Although the vagus nerve is central to autonomic and anti-inflammatory regulation, its relationship to renal structural injury in severe subarachnoid hemorrhage was unclear.
In a rabbit model of subarachnoid hemorrhage, reduced vagal compound action potential amplitude was strongly correlated with increased glomerular injury, suggesting a link between autonomic dysfunction and renal damage.
May link vagal activity to glomerular integrity in experimental SAH; leaves open clinical relevance and need for human studies.
Background: Subarachnoid hemorrhage (SAH) induces a sympathetic surge and systemic inflammation that may impair renal perfusion and glomerular integrity. Although the vagus nerve is central to autonomic and anti-inflammatory regulation, its relationship to renal structural injury in severe SAH is unclear. This study evaluated whether electrophysiological vagal CAP amplitude correlates with glomerular integrity in an experimental SAH model. Methods: Nineteen rabbits were assigned to control (n = 5), sham (n = 5), and SAH groups (n = 9). SAH was induced by daily cisterna magna injections of autologous blood for three days, and animals were followed for 14 days; those that did not survive to the 14-day endpoint formed the SAH-Nonsurvivor subgroup (n = 4). Vagal compound action potential (CAP) amplitude (mV) was recorded electrophysiologically and used as the principal physiologic readout of vagal nerve integrity. Renal tissue and perirenal parasympathetic ganglia were analyzed histologically and stereologically to quantify degenerated neurons and atrophic glomeruli (per mm3). Vagal CAP amplitude decreased from 1.42 ± 0.36 mV in controls to 0.34 ± 0.11 mV in the SAH-Nonsurvivor subgroup (p < 0.001), while atrophic glomeruli increased from 4 ± 1 to 98 ± 11 per mm3. Degenerated neuronal density peaked in the SAH-Nonsurvivor subgroup (98 ± 19 per mm3). Vagal CAP amplitude was inversely correlated with glomerular injury (Spearman ρ = −0.89; 95% CI −0.96 to −0.73; p < 0.001). Conclusions: In this small exploratory study, reduced vagal CAP amplitude was associated with greater glomerular injury after severe SAH. These hypothesis-generating findings warrant confirmation in larger, adequately powered studies before any physiologic or translational interpretation can be made.
No takes yet. Share an insight, caveat, or question.
Çağlayan et al. (2026) studied Subarachnoid hemorrhage (n=19). Subarachnoid hemorrhage induction via autologous blood injection vs. Control and sham was evaluated on Correlation between vagal compound action potential amplitude and glomerular injury (Spearman ρ -0.89, 95% CI -0.96 to -0.73, p=<0.001). Reduced vagal compound action potential amplitude was inversely correlated with glomerular injury after severe subarachnoid hemorrhage (Spearman ρ = -0.89; 95% CI -0.96 to -0.73; P<0.001).
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: