Which factor must be confirmed in the determination of death with rigor mortis?

The determination of death involves several critical criteria, and in the context of rigor mortis, the assessment of the body's physiological signs is essential. Rigor mortis refers to the postmortem stiffening of muscles due to chemical changes in muscle tissue after death.

Auscultating the apical pulse for 60 seconds is significant because it helps to confirm whether there is any cardiac activity present. If there is no detectable heartbeat after thorough auscultation, it can be strong evidence of death. This method is especially relevant in emergency medical settings where immediate transport decisions may be necessary.

In contrast, checking the peripheral pulse for an extended period, confirming brain death through imaging, or measuring body temperature may provide additional clinical information but are not specifically tied to the physiological changes of rigor mortis. Furthermore, these methods may not give a definitive indication of the presence or absence of life in a timely manner compared to assessing the apical pulse.