An elderly lady without any comorbidities, presented with paroxysmal palpitations and was documented to have an adenosine-responsive narrow complex tachycardia (NCT). Baseline electrocardiogram (ECG) showed normal sinus rhythm with no preexcitation. Tachycardia ECG showed a regularly irregular short RP NCT at the rate of around 150/min with alternating cycle lengths of 320 ms and 360 ms. What is the likely diagnosis?
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Crystal structures of six complexes of phosphane chalcogenides P ( = -butyl or isopropyl, = S or Se) with the metal halides ( = Pd or Pt, = Cl or Br), two halochalcogenyl-phospho-nium derivatives ( Bu PrPBr)[PdBr] and one hydrolysis product.
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The complexes - (: = BuPrPSe, = Pd, = Cl; : = Bu PrPSe, = Pd, = Cl; : = Bu PrPSe, = Pd, = Br; : = Bu PrPS, = Pd, = Br; : = Bu PrPS, = Pt, = Cl) {systematic names: (-butyl-diiso-propyl-phosphine selenide-κ)di-chlorido-palladium(II), [PdCl(CHPSe)] (), (di--butyl-iso-propyl-phosphine selenide-κ)di-chloridopalladium(II), [PdCl(CHPSe)] (), di-bromido-(di--butyl-iso-propyl-phosphine selenide-κ)palladium(II), [PdBr(CHPSe)] (), di-bromido-(di--butyl-iso-propyl-phosphine sulfide-κ)palladium(II), [PdBr(CHPS)] (), di-chlorido-(di--butyl-iso-propyl-phosphine sulfide-κ)palladium(II), [PdCl(CHPS)] ()} all display a configuration with square-planar geometry at the metal atom. Compounds and are isotypic. The mol-ecules of and display crystallographic inversion symmetry; compound involves two independent mol-ecules, each with inversion symmetry but with differing orientations of the tri-alkyl-phosphane groups.
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