Ameroid constrictors

K. P. Gallagher, G. Osakada, W. S. Kemper and J. Ross Jr., Cyclical coronary flow reductions in conscious dogs equipped with ameroid constrictors to produce severe coronary narrowing, Basic Res Cardiol SO, 100-106(1985). 

Dogs weighing 20-30 kg were given 1 ml Combi-len i.m. 60 min before intravenous thiopental anaesthesia (5-lOmg/kg). After 1 mg succinyl cho-Une/kg intravenously the animals were intubated for nitrous oxide narcosis (NjO 02 =3 1). The anterior descending and circumflex branches of the left coronary artery were exposed and an Ameroid constrictor (Litvak et al. 1957) with 2.5 mm diameter was set. Epicardiectomy, cardio-pneumopexy, and omentopexy were performed to induce collateral circulation (for details of operation techniques see Wernitsch 1970). 

Fig. 348. Disrupted tunica elastica interna of the ramus circumflexus of the left coronary artery of a dog (No.91) sacrificed 180 days after setting Ameroid constrictors (2.5 mm central lumen) and cardioomentopexy. Formalin. Paraffin section, unstained, embedded in glycerol. Interference contrast FI 50/0.85/ OO/0.17. Agfachrome 50 L professional...

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