Also known as: Brain aneurysm
Manny Jr. has a fusiform aneurysm in the vertebral basilar artery near the Circle of Willis requiring emergency neurosurgery. The surgical team induces hypothermic circulatory arrest (suspended animation) to allow safe repair, but the surgery is complicated by a radiation spill in the OR.
Also known as: Severe allergic reaction
Dave, an accountant who fancies himself an urban outdoorsman, presents for his third time this week with anaphylactic shock from multiple bee stings after a beehive transfer went wrong. He requires epinephrine, hydrocortisone, and antihistamines.
Also known as: Leg amputation
Tennessee, the mountain guide, suffers severe trauma from a rock climbing accident including broken femur, shattered wrist, and possible pelvic fracture. She requires emergency field amputation of her foot to free her from rocks before a rockslide, followed by cauterization with a heated carabiner to control bleeding.
Also known as: Shock from blood loss
Tennessee develops hypovolemic shock from massive blood loss following her traumatic injuries and field amputation. The team must cauterize her leg to prevent fatal exsanguination while awaiting helicopter rescue.
Dr. Reynolds is exposed to high levels of thallium radiation during Manny Jr.'s neurosurgery when a radiation spill is discovered in the OR. He refuses to leave the surgical field despite the danger, prioritizing completing the surgery over his own safety.
Also known as: Heroin addiction
Vanessa is mentioned as having overdosed previously and is implied to be struggling with ongoing substance use. Lauren, who is three years sober, reaches out to help someone struggling with addiction at an NA meeting.
Max mentions that his daughter Luna has been diagnosed with a peanut allergy that could cause her to stop breathing, using it as a metaphor for needing to avoid Helen. This is mentioned in passing but indicates an ongoing health concern.