Got something to say to this podcast? Send a voicemail, and you might hear yourself on the next episode!

0.9% Sodium Chloride: The Drug We Give Without Thinking (Free Preview) | Anesthesia Drug Compendium Series

Normal" saline is not normal. Plasma runs Na⁺ ≈ 140 and Cl⁻ ≈ 100; the bag holds 154 of each at 308 mOsm/L. The supraphysiological chloride — half again above normal — defines everything modern medicine worries about in the bag.

This episode covers: the 1832 cholera outbreak that invented IV fluid resuscitation, Hamburger's 1896 red-cell experiments that gave us the "0.9%" (and overshot the true isotonic value), hyperchloremic metabolic acidosis via the Stewart strong-ion-difference mechanism, the 2018 SMART and SALT-ED trials, and the three jobs no balanced crystalloid does better than normal saline.

The full episode, available on Supercast >>> https://diaryofaloststudent.supercast.com/

Timestamps

00:42 — "Normal" is not normal

01:16 — The modern formulation

01:40 — The full episode continues on Supercast...

Full Episode

The complete saline episode — is on Supercast https://diaryofaloststudent.supercast.com/

If this made something click, leave a 5-star rating and follow the show. That's how other anesthesia providers — residents, SRNAs, SAAs, CRNAs, and anesthesiologists — find it. New episodes every week.

Got something to say to this podcast? Send a voicemail, and you might hear yourself on the next episode!

Massive Transfusion Protocol: The 1:1:1 Ratio, and the Diamond of Death | Anesthesia Clinical Concepts

Ten units of red cells in 24 hours. That was the old definition — arbitrary, borrowed because ten units approximates one adult blood volume. It never accounted for rate. A patient can lose half their volume in an hour and never reach ten units before they arrest. Massive transfusion is not a number. It is a physiology problem with a clock attached.

This episode covers the protocol from activation to deactivation — the ABC score, the 1:1:1 ratio, and what the PROPPR trial actually showed. Then the mechanism underneath: the lethal triad of hypothermia, acidosis, and coagulopathy, plus the fourth variable that turns a triad into a death spiral — ionized hypocalcemia from citrate. Viscoelastic testing, tranexamic acid, calcium, warming, and the team roles that decide outcomes.

Key Takeaways

• Massive transfusion is traditionally defined as 10 or more units of red cells in 24 hours. Modern practice favors dynamic criteria

• The ABC score uses four bedside variables — penetrating mechanism, positive FAST, systolic BP ≤90, heart rate ≥120. Two or more activates the protocol.

• Balanced resuscitation with a 1:1:1 ratio of plasma to platelets to red cells improves early hemorrhage control. The PROPPR trial showed no significant 24-hour mortality difference versus 1:1:2, but more patients in the 1:1:1 group achieved hemostasis and fewer died of exsanguination.

• The lethal triad — hypothermia, acidosis, and coagulopathy. Citrate is the fourth variable that creates the diamond. Every unit of blood carries citrate that binds ionized calcium. Hypothermia and hypoperfusion slow citrate metabolism, prolonging hypocalcemia and worsening coagulopathy.

• Transexamic acid works by blocking plasmin activation, preventing clot degradation rather than promoting clot formation.

• Rapid infusers warm and deliver 200–1,200 mL/min. Warming is not comfort — it is coagulation management.

Timestamps

00:00 — The falling wall

02:00 — 1:1:1 ratio

02:36 — The lethal triad and the diamond of death

03:33 — Calcium, Transexamic Acid, Cryoprecipitate

04:10 — The rediscovery of balance

05:05 — PROPPR Trial

05:31 — From Theory to Practice

If this made something click, leave a 5-star rating and follow the show. That's how other anesthesia providers — residents, SRNAs, SAAs, CRNAs, and anesthesiologists — find it. New episodes Tuesday and Friday.

Hey! I'd love to hear your thoughts, send me a voice note.

Phase 2 Conjugation: Glucuronidation and Why Some Drugs Last Longer | Anesthesia Foundational Concepts

Imagine trying to catch a very slippery fish with your bare hands. It keeps slithering away. Now imagine someone glues a heavy, easy-to-grip handle onto the fish. Suddenly you can catch it.

That is conjugation. Fat-soluble drug molecules are the slippery fish — they slip through the kidneys, get reabsorbed, and stick around in the body. Phase II enzymes glue a polar handle onto each drug molecule, usually glucuronic acid, and the resulting compound is water-loving enough for the kidneys to grab and flush out.

This episode covers how that works, why almost every drug needs chemical alteration before it can leave the body, the difference between Phase I and Phase II and the role of glucuronidation. Then it follows conjugation to the bedside, where two stories anchor almost everything anesthesiology needs to know.

Key Takeaways

• Phase II conjugation attaches a large polar group to a lipid-soluble drug so the kidneys can excrete it.

• Glucuronidation is the busiest pathway.

• Morphine is the famous exception.

• Morphine-6-glucuronide (M6G) is roughly twice as potent as morphine at the μ-opioid receptor and accounts for about 10 percent of metabolites.

• Acetaminophen overdose works through the same machinery. Glucuronidation and sulfation saturate, more drug shunts through CYP2E1 to NAPQI, glutathione depletes, and NAPQI binds hepatocyte proteins. N-acetylcysteine replenishes glutathione so conjugation of NAPQI can resume.

• Phase II is relatively preserved in liver disease.

• Newborns have immature UGT capacity. That shortfall is behind neonatal jaundice.

Timestamps

00:00 — The slippery fish

01:17 — Two fates, two phases

02:00 — Phase I versus Phase II

02:30 — Glucuronidation and the other tags

03:17 — Immature at birth: jaundice and gray baby

03:46 — The exception: morphine-6-glucuronide

04:55 — From Theory to Practice

05:06 — Morphine and renal failure

06:09 — Acetaminophen and NAPQI

07:19 — One habit of mind

If this made something click, leave a 5-star rating and follow the show. That's how other anesthesia providers — residents, SRNAs, SAAs, CRNAs, and anesthesiologists — find it. New episodes Tuesday and Friday.