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Two separate heart valves with switched blood vessels describes transposition of the great arteries, not truncus arteriosus. Transposition features parallel circulations where the aorta arises from the right ventricle and the pulmonary artery from the left ventricle. Truncus arteriosus possesses only one common ventricular valve.

Missing pulmonary arteries with pulmonary blood flow dependent entirely on systemic collaterals from the abdomen describes a severe variant of tetralogy of Fallot with pulmonary atresia. This is also called a pseudotruncus. True Type I truncus arteriosus possesses a well-formed common pulmonary artery trunk.

Right and left pulmonary arteries branching completely separate from each other from the posterior or lateral wall of the main truncus defines Type II or Type III truncus arteriosus. In Type I, they do not arise separately; they stem from a single, short common pulmonary trunk.

A wide, fixed splitting of the second heart sound is the classic hallmark of an atrial septal defect. This split occurs because delayed right ventricular emptying prolongs pulmonic valve closure across all respiratory phases. It cannot happen in truncus arteriosus where a pulmonic valve does not exist.

A muffled, distant first heart sound paired with a pericardial friction rub indicates acute pericarditis or a large pericardial effusion. This finding points to inflammation or fluid accumulation around the epicardium. It is not an inherent anatomical sound variation of a truncus arteriosus defect.

Complete absence of systolic murmurs is unexpected because truncus arteriosus always features a large ventricular septal defect and altered flow. High-velocity blood moving across the overriding truncal valve routinely creates a systolic ejection murmur. Tricuspid regurgitation from volume overload can also cause murmurs.

Edwards syndrome is caused by trisomy 18 and presents with severe growth restriction, clenched fists, and low-set ears. While ventricular septal defects and polyvalvular disease are common, it is not the classic genetic driver for truncus arteriosus. DiGeorge syndrome shares a far more specific link.

Down syndrome is caused by trisomy 21 and is strongly associated with endocardial cushion defects. These include complete atrioventricular canal defects and isolated atrial or ventricular septal defects. It does not carry a primary or frequent association with truncus arteriosus.

Turner syndrome is characterized by a 45,X karyotype in females and classically drives left-sided obstructive cardiac lesions. These include bicuspid aortic valves, coarctation of the aorta, and hypoplastic left heart syndrome. It is rarely implicated in truncus arteriosus development.

Aggressive milking or stripping of chest tubes creates extreme negative pressure within the thoracic cavity that can injure delicate vascular structures. This high suction can worsen active bleeding at the aortic or pulmonary suture sites. Routine aggressive manipulation is contraindicated in pediatric care.

Documenting this volume and waiting two hours is an unsafe omission of care that delays essential medical intervention. Active hemorrhage at this rate can lead to exsanguination or tamponade within minutes. High-volume bloody drainage requires immediate escalation rather than continued observation.

Decreasing the intravenous maintenance fluid rate exacerbates the infant's existing hypovolemia caused by rapid blood loss. The patient is losing intravascular volume, so reducing fluid intake would accelerate cardiovascular collapse. Intravenous access must instead be preserved for volume resuscitation.