Posthaemorrhagic ventricular dilatation is the most serious direct complication of intraventricular haemorrhage after preterm birth. It results initially from multiple small blood clots throughout the cerebrospinal fluid channels impeding circulation and reabsorption. Management is difficult and new treatment approaches are needed.

The perturbative dilatation operator in 3d is constructed at the leading two-loop order.

The existence of a shallow or virtual tetraquark state, c c ū d̄, is discussed. Using the putative masses for the doubly charmed baryons (c c u/c c d) from SELEX, the mass of the c c ū d̄ state is estimated to be about 3.9GeV , only slightly above the DD threshold. The experimental signatures for various c c ū d̄ masses are also discussed. Typeset using REVTEX 1

Denote by ’ the set of all real symmetric matrices. We use to 8 ‚ 8 K L K ž L a b denote that is positive semidefinite (definite). For or K  L M œ > ß > c d ! 0 Ё_ß > Ó 0 and \ œ P Mß 8 ‚ 8 V \ 8‚8 or ’ _ , denote by the space of all bounded and measurable a b functions from to and by the space of all with M \ P Mß T − P Mß "ß_ _ a b a b \ \ T − P Mß P Mß − P Mß w _ _ _ 8 a b a b a b \ E − V ...

BACKGROUND The Ross operation is an alternative to mechanical aortic valve replacement in the young. Early dilatation of the pulmonary autograft root exposed to the systemic circulation has been reported. To define the prevalence of, risk factors for, and consequences of late autograft dilatation, outcome in all consecutive patients operated since May 1994 was reviewed. METHODS AND RESULTS Ni...

The existence of a shallow or virtual tetraquark state, c c ū d̄, is discussed. Using the putative masses for the doubly charmed baryons (c c u/c c d) from SELEX, the mass of the c c ū d̄ state is estimated to be about 3.9GeV , only slightly above the DD threshold. The experimental signatures for various c c ū d̄ masses are also discussed. Typeset using REVTEX 1