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Rationale: Left main shock syndrome (LMSS) induced by thrombosed coronary artery dissection is very rare and has a fatal prognosis. Optimal treatment strategy includes early reperfusion and hemodynamic support to prevent cardiogenic shock. However, it involves the extension of technical difficulties under different conditions.

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The case of a 63-year old female suffering from recurrent paroxysmal supraventricular tachycardia for 30 years is reported. In the past she was treated unsuccessfully with multiple drugs. Electrophysiological study showed dual nodal pathways and the inducibility of a junctional reciprocating tachycardia with RR and V-A intervals respectively 360-410 and 40 msec.

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Clinical clues to magnesium deficiency.

Isr J Med Sci

December 1987

Department of Medicine B, Lady Davis Carmel Hospital, Haifa, Israel.

Two cases of congestive heart failure with coexistent magnesium and potassium depletion are described. The prolonged QTc intervals and ventricular premature beats of the first patient and the idionodal tachycardia of the second patient disappeared only after magnesium repletion, which normalized both extra- and intracellular potassium and magnesium levels. The third patient had a case of urosepsis while on total parenteral nutrition.

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Modulation of a parasystolic rhythm implies that the latter is affected by nonparasystolic beats in predictable ways. When modulation occurs the diagnosis of ventricular parasystole cannot be made by applying the well-known 'classical' criteria. This report deals with clinical tracings from three cases having modulated parasystole with unusual characteristics.

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Seven patients with congestive heart failure receiving long-term diuretic treatment (more than three years) experienced idionodal tachycardia in the presence of apparently normal serum digoxin levels. Intravenous bolus administration of magnesium (Mg) sulfate, followed by intramuscular Mg repletion, abolished the digitalis-toxic arrhythmia. The finding of decreased lymphocyte Mg and potassium contents proved the existence of cellular Mg depletion associated with normal serum Mg levels in five patients and with hypomagnesemia in the other two.

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