Diary of a Lost Student: From Theory to Practice -Foundational Anesthesia Concepts for All Providers

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.

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

Got something to say to this podcast? Send a voicemail, and you might hear yourself on the next episode! INTRALIPID 20%: The Lipid Emulsion That Reverses LAST (Free Preview) | Anesthesia Drug Compendium Series The same bag of fat that feeds the sickest patients is the antidote that restarts a poisoned heart. It was built to feed people — the world's first safe intravenous fat, a soybean-oil emulsion held in water by egg-yolk phospholipid, developed by the Swedish biochemist Arvid Wretlind at the Karolinska Institute and approved in 1962 after a decade spent taming the toxicity of the fat solutions that came before it. Intralipid 20% is a milky white emulsion of 20% soybean oil, 1.2% egg yolk phospholipids, and 2.25% glycerin. The full episode, available on Supercast, goes underneath: How it was discovered, the mechanism and dosing and exactly how a bag of nutrition restart and feeds a poisoned heart and Key Takeaways. Timestamps 00:00 — The miracle of a bag of fat 01:35 — The full episode continues in Supercast.... FULL EPISODE The complete Intralipid 20% 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 Tuesday and Friday.

Got something to say to this podcast? Send a voicemail, and you might hear yourself on the next episode! Local Anesthetic Systemic Toxicity: The Signal Jammer You Have to Recognize Early | Anesthesia Clinical Concepts LAST is rare — roughly 0.27 episodes per 1,000 peripheral nerve blocks — but when it happens, it is one of the few true emergencies in anesthesia where the clock, not the diagnosis, decides who lives. The reason it kills is not that it is hard to treat. It is that it is hard to see. AUnder sedation or general anesthesia, the classic neurologic prodrome — circumoral numbness, metallic taste, tinnitus, agitation — is gone. All you have is a patient who suddenly does not look right. This episode covers the mechanism, the history, and the response. It talks about the ASRA response and the ASRA-modified resuscitation protocal. One last point that saves lives: up to a quarter of patients can relapse. Highly lipophilic agents redistribute and produce delayed recurrence. Observe long enough after apparent recovery to catch it. Key Takeaways • Under sedation or general anesthesia, the neurologic prodrome may be absent. Isolated cardiovascular collapse can be the first sign. • Intravascular injection produces symptoms in one to three minutes. Overdose may peak at twenty to thirty minutes. • Mechanism: sodium channel blockade. At toxic concentrations, that block reaches the myocardium — reduced action potential duration, bradycardia, hypotension, collapse. • Treatment order: stop injecting, call for help, 100% oxygen, benzodiazepines for seizures, 20% lipid emulsion early for serious LAST. • Lipid emulsion dosing: 1.5 mL/kg bolus over one minute, then 0.25 mL/kg/min. Double to 0.5 mL/kg/min if blood pressure remains low. Cumulative ceiling roughly 12 mL/kg. • ASRA-modified resuscitation: avoid large epinephrine doses, vasopressin, calcium channel blockers, and beta-blockers — they may worsen toxicity. • Relapse is real. Up to 25% of patients develop recurrent toxicity. Observe long enough after apparent recovery to catch it. Timestamps 00:00 — The signal Jammer 01:52 — One trick pony 02:35 — First, the brain, then the heart 03:26 — Bupivicaine: the one to fear 04:22 — The safer cousins 04:36 — Antidote is not a channel drug but fat 05:01 — History: a single alarmed editorial 06:58 — From Theory to Practice 08:46 — The ASRA Sequence 09:26 — The price tag on every local anesthetic If this made something click, leave a 5-star rating and follow the show. That's how other anesthesia providers — residents, SRNAs, SAAs, CRNs, and anesthesiologists — find it. New episodes twice a week.

Got something to say to this podcast? Send a voicemail, and you might hear yourself on the next episode! Tochen's Formula: Neonatal Endotracheal Tube Depth, Explained | Pediatric Anesthesia Concepts A term newborn's entire trachea is about four centimeters long — shorter than your thumb — and the tube tip has to stop in the middle of it, below the vocal cords and above the point where the airway splits to the two lungs. That leaves a safe window measured in millimeters: an error of a single centimeter drives the tip down a mainstem bronchus, ventilating one lung, or back up through the cords and out. Tochen's formula is the elegant answer to that narrow target: the depth to insert an oral tube, measured at the lip, is simply the infant's weight in kilograms plus six. This episode covers — the single 1979 study, how to use Tochen's formula to get it right on the first attempt, required confirmations and primary checks, updates to the Neonatal Resuscitation Program guidelines, and how it relates to everyday practice. Key Takeaways: Tochen's formula is the elegant answer to that narrow target: the depth to insert an oral tube, measured at the lip, is simply the infant's weight in kilograms plus six. It pairs naturally with the vocal-cord depth marker many neonatal tubes carry Goal: you want it mid-trachea, around the first or second thoracic vertebra on an X-ray, halfway between the cords and the carina. Confirm with symmetric chest rise, listen for equal breath sounds in both axillae, look for a sustained capnography trace, and get an X-ray. Neonatal Resuscitation Program's 7th edition in 2016 stepped back from weight-plus-six as its primary method, adopting instead a gestational-age insertion-depth table and the nasal-tragus length. Timestamps 00:00 — The narrow landing strip 02:12 — The 7-8-9 rule 03:04 — Trachea length to body weight 03:34 — Primary tube confirmation 03:52 — Head-dependance link 04:33 — A single 1979 study 06:06 — From Theory to Practice 07:35 — Know where the rule frays 08:46 — An emblem of good Pediatric 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 twice a week/