What device is shown in the picture, and what is it used for.

Which conduction structure is known as the “gatekeeper” between atria and ventricles? Purkinje fibers Bundle of His AV node SA node I picked bundle of his for the answer because the book says that's the "gatekeeper" (pg. 210) and I got it wrong, but google and the feedback says AV node. Wondering which is correct.

Patients with alcoholism are prone to subdural hematomas and GI bleeding because: A) they fall more frequently than sober people B) their blood clotting mechanisms are impaired C) they are at high risk for violent assaults D) alcoholics are immunocompromised

Last P2 lab there was a good discussion about a patient who overdosed on caffeine. The patient's HR was 190, in SVT. How should this be managed? - Supportive care first → oxygen, IV access, cardiac monitoring. - Benzodiazepines (e.g., midazolam, diazepam, lorazepam) → first-line to reduce sympathetic surge, agitation, and rate. - Avoid adenosine or beta-blockers initially in massive caffeine overdose, because underlying mechanism is not a pure AV node reentry — and abrupt AV nodal block may worsen instability. - Calcium channel blockers (diltiazem, verapamil) slow AV node conduction, but they don’t address the underlying catecholamine storm and can drop blood pressure in an already unstable overdose patient. - Fluids → for perfusion support. - Transport to ED → may need activated charcoal (if recent ingestion), antiarrhythmics (like esmolol), or even dialysis in severe cases.

A 21-year-old female presents with fever, headache, photophobia, and stiff neck. Vitals: BP 100/64, HR 122, Temp 102.9°F. What is the MOST important infection control step? A) Gown and sterile gloves B) N95 mask for airborne precautions C) Surgical mask for droplet precautions D) Face shield only