Acetazolamide induces indomethacin and ischaemia-sensitive pial arteriolar vasodilation in the piglet

Ferenc Domoki, Aliz Zimmermann, Valéria Tóth-Szuki, David W. Busija, Ferenc Bari

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Aim: Acetazolamide (AZD) produces cerebral vasodilation. The underlying mechanism is unclear, but it is assumed to be largely due to CO2 retention and acidosis. We tested if cerebrovascular effects of AZD were similar to hypercapnia in the newborn pig. Methods: We used the closed cranial window/intravital microscopy technique to determine pial arteriolar diameters simultaneously with laser-Doppler flowmetry (LDF) to monitor cortical blood perfusion. Anaesthetized (Na-thiopenthal + α-chloralose), ventilated, 1-day-old instrumented piglets (n = 38) were divided into five experimental groups: time control (n = 11), indomethacin, ibuprofen, Nω- nitro-L-arginine methyl ester (L-NAME) treatments (1, 30, 15 mg/kg, i.v., n = 6, 6, 4, respectively), and global ischaemia/reperfusion (I/R, 10 min induced by elevated intracranial pressure, n = 11). Responses to 5-10% inhaled CO 2 were recorded before and after the treatments, and then in a similar manner to AZD (10-20 mg/kg, i.v.). Results: Hypercapnia and AZD produced pial arteriolar vasodilation and increases in cortical perfusion. Consistent with previous data, hypercapnia-induced changes were abolished by indomethacin, unaltered by ibuprofen and L-NAME and were significantly attenuated after I/R. AZD-induced vasodilation was also sensitive to indomethacin and I/R and was unaltered by ibuprofen or L-NAME. Conclusion: The mechanism of AZD-induced vasodilation appears to be similar/identical to hypercapnia, and pial arteriolar diameter changes reflect changes in cortical perfusion.

Original languageEnglish
Pages (from-to)280-284
Number of pages5
JournalActa Paediatrica, International Journal of Paediatrics
Volume97
Issue number3
DOIs
Publication statusPublished - Apr 2008

Keywords

  • Cranial window
  • Hypercapnia
  • Ibuprofen
  • N-Nitro-L-arginine methyl ester

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health

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