Principles of Forensic Pathology Flashcards

In a fire death investigation, which finding most strongly suggests the victim was alive during the fire rather than placed there post-mortem?

Answer: Soot and carbon monoxide in the airway and elevated carboxyhemoglobin

Inhalation of soot into the airways and elevated carboxyhemoglobin levels confirm active breathing during the fire, proving the victim was alive when the fire occurred.

What distinguishes a 'chop wound' from other sharp force injuries?

Answer: It is caused by a heavy-bladed implement and may show combined sharp and blunt force characteristics

Chop wounds are inflicted by heavy-bladed instruments (axes, machetes, cleavers) and display both sharp cutting and blunt crushing components, often extending into bone.

A victim of suspected manual strangulation shows no external neck marks. Which internal autopsy finding would most strongly support this diagnosis?

Answer: Hemorrhage in the strap muscles of the neck and fracture of the thyroid cartilage

Internal hemorrhage in the neck's strap muscles and laryngeal cartilage fractures can occur without visible external bruising, particularly in strangulation victims with darker skin or delayed autopsy.

Which classification system is used by forensic pathologists to describe the severity and pattern of lacerations to the aorta in blunt thoracic trauma?

Answer: AIS (Abbreviated Injury Scale) or Organ Injury Scale (OIS)

The Abbreviated Injury Scale (AIS) and the AAST Organ Injury Scale (OIS) are used to grade aortic and solid organ injuries in blunt trauma, with Grade V representing complete transection.

An infant autopsy shows multiple rib fractures in various stages of healing, retinal hemorrhages, and subdural hematoma without external injuries. What is the most appropriate manner of death?

Answer: Homicide

The constellation of injuries at different healing stages without plausible accidental explanation is characteristic of repetitive non-accidental trauma (child abuse), supporting a homicide ruling.

Which toxin causes 'pink froth' in the airways and acute pulmonary edema seen at autopsy, with a history of inhalation exposure?

Answer: Chlorine or phosgene gas

Chlorine and phosgene are potent pulmonary irritants that cause massive alveolar damage, resulting in acute pulmonary edema with pink frothy fluid filling the airways.

In evaluating blunt force injuries, which feature of a laceration helps distinguish it from a sharp force incised wound?

Answer: Lacerations show bridging tissue, abraded/contused margins; incised wounds have clean, sharp edges

Lacerations from blunt force show tissue bridges crossing the wound, and margins exhibit abrasion and contusion; incised wounds from sharp edges have clean, undamaged margins without bridging.