Focused Concept Reviews
Physiology · Indices · Pharmacokinetics
The science behind the practice. Each entry isolates a single concept: a monitoring index, a kinetic principle, a physiological mechanism and unpacks it at the level of rigor that clinical decision-making demands. No filler, no textbook sprawl. Just the framework you actually need to understand what’s happening at the bedside.
Each entry is self-contained, and written to support the same analytical framework used throughout the Case Law Index and Drug Spotlight series.
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The Neuromuscular Junction
The neuromuscular junction relies on nicotinic receptors and a built-in safety margin, so fade only appears once about 75% of those receptors are blocked.
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Train of Four Ratio: Quantifying Paralysis
Train-of-Four ratio explained: T4:T1 fade, depth-of-block staging, and why ≥0.9 is the threshold defining adequate recovery from neuromuscular blockade.
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Capnography & ETCO₂: Visualizing Ventilation
Capnography & ETCO₂: Visualizing Ventilation The Waveform, the Number, and What Each Phase Actually Tells You Respiratory Monitoring · CO₂ Transport · Waveform Analysis · Airway Safety TL;DR In practice, ETCO₂ is best understood…
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MAC: How Anesthetic Potency is Defined
MAC: How Anesthetic Potency is Defined MAC-awake vs. MAC-intubation, and the Patient Factors That Shift the Curve Pharmacokinetics · Volatile Agents · Anesthetic Potency · Dose-Response Background: Minimum Alveolar Concentration (MAC): the end-tidal concentration…
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Bispectral Index (BIS): Monitoring the Brain Under Anesthesia
Bispectral Index (BIS): Monitoring the Brain Under Anesthesia EEG Signal Processing, Spectral Analysis, and the 0–100 Scale as a Proxy for Hypnotic Depth M&I · Neuromonitoring · EEG · Anesthetic Depth Background: The Bispectral…
Nothing published in this section yet.
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Dead Space Fraction (Vd/Vt): Measuring Wasted Ventilation
Dead Space Fraction (Vd/Vt): Measuring Wasted Ventilation The Bohr/Enghoff equation, the ETCO₂ gradient, and tracking lung perfusion Capnography · Airway Management · Cardiovascular Physiology Background: Dead Space Fraction (Vd/Vt): the proportion of a tidal…
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Fick Principle
Fick Principle Arteriovenous Extraction, Cardiac Output, and the Shift from Direct to Indirect Measurement Cardiovascular Physiology · Capnography · Case Analysis Background: Fick Principle: the physiological rule stating that the total uptake or release…
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Cardiac Output: Quantification of Heart Performance
Cardiac Output: Quantification of Heart Performance Stroke Volume vs. Heart Rate, and the Four Determinants That Make or Break Perfusion Cardiovascular Physiology · Hemodynamics · Preload & Afterload · Anesthetic Management Background: The concept…