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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.

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Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...

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Related Experiment Video

Updated: Feb 16, 2026

Reduction of Iatrogenic Atrial Septal Defects with an Anterior and Inferior Transseptal Puncture Site when Operating the Cryoballoon Ablation Catheter

Reduction of Iatrogenic Atrial Septal Defects with an Anterior and Inferior Transseptal Puncture Site when Operating the Cryoballoon Ablation Catheter

Published on: June 15, 2015

Symptomatic partial and transitional atrioventricular septal defect repaired in infancy.

Sylvia Krupickova¹, Gareth J Morgan², Mun Hong Cheang³

¹Department of Paediatric Cardiology, Royal Brompton Hospital, London, UK.

Heart (British Cardiac Society)

|December 31, 2017

Summary

Infants with symptomatic atrioventricular septal defects need early surgical repair. Unfavorable left atrioventricular valve anatomy is a key risk factor for reoperation in these young patients.

Keywords:

congenital heart disease congenital heart disease surgery

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Area of Science:

Pediatric Cardiology
Congenital Heart Disease Surgery
Pediatric Cardiac Surgery

Background:

Symptomatic infants with partial and transitional atrioventricular septal defects (AVSD) undergoing early surgical repair are considered high-risk.
The specific outcomes and risk factors for this patient group are not well-defined.

Purpose of the Study:

To evaluate the outcomes of symptomatic infants undergoing early surgical repair for partial and transitional AVSD.
To identify risk factors associated with mortality and reoperation in this cohort.

Main Methods:

A multicenter study involving 51 infants (0-1 year) with symptomatic partial/transitional AVSD requiring biventricular repair.
Data collected on patient demographics, surgical procedures, valve anatomy, and clinical outcomes including mortality and reoperation rates.

Main Results:

Three in-hospital deaths (5.9%) occurred post-primary repair.
Eleven patients (22%) required reoperation, primarily for left atrioventricular valve regurgitation/stenosis.
Unfavorable left atrioventricular valve anatomy was the sole predictor of reoperation (31% of patients had unfavorable anatomy).

Conclusions:

Early surgical repair of symptomatic partial/transitional AVSD in infants leads to significant morbidity and mortality.
A high reoperation rate is associated with unfavorable left atrioventricular valve anatomy in this population.