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Erschienen in: Basic Research in Cardiology 6/2008

01.11.2008 | ORIGINAL CONTRIBUTION

Reduced calcium responsiveness characterizes contractile dysfunction following coronary microembolization

verfasst von: Andreas Skyschally, Petra Gres, Patrick van Caster, Anita van de Sand, Kerstin Boengler, Rainer Schulz, Prof. Dr. med. Dr. h.c. Gerd Heusch

Erschienen in: Basic Research in Cardiology | Ausgabe 6/2008

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Abstract

Aims

We addressed calcium responsiveness in microembolized myocardium at 6 h after coronary microembolization (ME).

Methods and results

In anesthetized pigs calcium responsiveness was determined as the increase of a myocardial work index (WI; LV pressure development vs. wall thickening) in response to a graded intracoronary infusion of CaCl2 at baseline and at 6 h after ME or placebo, respectively. At baseline, CaCl2 infusion increased WI in both groups (ME: 296 ± 22 to 468 ± 47 mmHg*mm; placebo: 324 ± 24 to 485 ± 38 mmHg*mm; mean ± SEM). At 6 h after ME, WI was decreased by 159 ± 16 mmHg*mm (P < 0.05 vs. baseline) and remained reduced at any calcium concentration, whereas it was unchanged with placebo. The calcium concentration in coronary blood necessary to achieve the half maximal increase in WI remained unchanged from baseline to 6 h and did not differ between placebo and ME.

Conclusion

The ME-induced myocardial dysfunction is not related to an altered calcium sensitivity, but is characterized by a reduced maximal contractile force.
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Metadaten
Titel
Reduced calcium responsiveness characterizes contractile dysfunction following coronary microembolization
verfasst von
Andreas Skyschally
Petra Gres
Patrick van Caster
Anita van de Sand
Kerstin Boengler
Rainer Schulz
Prof. Dr. med. Dr. h.c. Gerd Heusch
Publikationsdatum
01.11.2008
Verlag
D. Steinkopff-Verlag
Erschienen in
Basic Research in Cardiology / Ausgabe 6/2008
Print ISSN: 0300-8428
Elektronische ISSN: 1435-1803
DOI
https://doi.org/10.1007/s00395-008-0732-1

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