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Document Description
This document is the "20 Document Description
This document is the "2008 ICU Manual" from Boston Medical Center, a comprehensive educational guide specifically designed for resident trainees rotating through the medical intensive care unit. Authored by Dr. Allan Walkey and Dr. Ross Summer, the handbook aims to facilitate learning in critical care medicine by providing structured resources that accommodate the busy schedules of medical residents. It includes concise 1-2 page topic summaries, relevant medical literature, and approved clinical protocols. The curriculum covers a wide array of critical care subjects, ranging from respiratory support and mechanical ventilation to cardiovascular emergencies, sepsis management, toxicology, and neurological crises. By integrating physiological principles with evidence-based protocols, the manual serves as both a quick-reference tool during clinical duties and a foundational text for understanding complex ICU pathologies.
Key Points, Topics, and Headings
I. Educational Framework
Purpose: Facilitate resident learning in the Medical Intensive Care Unit (MICU).
Components:
Topic Summaries (1-2 pages).
Literature Reviews (Original and Review Articles).
BMC Approved Protocols.
Curriculum Support: Didactic lectures, hands-on tutorials (ventilators, ultrasound), and morning rounds.
II. Respiratory Management & Mechanical Ventilation
Oxygen Delivery:
Oxygen Cascade: Describes the drop in partial pressure from the atmosphere to the mitochondria.
Equation:
DO2=[1.34×Hb×SaO2+(0.003×PaO2)]×C.O.
* Devices: Nasal cannula (variable performance), Non-rebreather mask (high FiO2).
Ventilator Initiation:
Mode: Volume Control (AC or SIMV).
Settings: TV 6-8 ml/kg, Rate 12-14, PEEP 5 cmH2O.
Alerts: Peak Pressure >35 cmH2O, sudden hypotension.
ARDS (Acute Respiratory Distress Syndrome):
Criteria: PaO2/FiO2 < 200, bilateral infiltrates, PAOP < 18.
ARDSNet Protocol: Low tidal volume (6 ml/kg IBW), Plateau Pressure < 30 cmH2O.
Management: High PEEP, prone positioning, permissive hypercapnia.
Weaning & Extubation:
SBT (Spontaneous Breathing Trial): Perform daily for 30 mins.
Criteria: PEEP ≤ 8, FiO2 ≤ 0.4, RSBI < 105.
Cuff Leak Test: Assess for laryngeal edema before extubation (Steroids may help if leak is poor).
NIPPV (Non-Invasive Positive Pressure Ventilation):
Indications: COPD exacerbation, Pulmonary Edema.
Contraindications: Altered mental status, unable to protect airway.
III. Cardiovascular & Hemodynamics
Severe Sepsis & Septic Shock:
SIRS Criteria: Fever >100.4 or <96.8, Tachycardia >90, Tachypnea >22, WBC count abnormalities.
Treatment: Antibiotics immediately (mortality increases 7%/hr delay), Fluids 2-3L immediately.
Pressors: Norepinephrine (1st line), Vasopressin (2nd line).
Vasopressors:
Norepinephrine: Alpha/Beta agonist (Sepsis).
Phenylephrine: Pure Alpha (Neurogenic shock).
Dopamine: Dose-dependent (Low: renal; High: pressor).
Dobutamine: Beta agonist (Cardiogenic shock).
Epinephrine: Alpha/Beta (Anaphylaxis, ACLS).
Massive Pulmonary Embolism (PE):
Management: Anticoagulation (Heparin).
Unstable: Thrombolytics.
Contraindications: IVC Filter.
IV. Diagnostics & Critical Thinking
Chest X-Ray (CXR) Reading:
5 Steps: Confirm ID, Penetration, Alignment, Systematic Review.
Key Findings: Right mainstem intubation (raise suspicion if unilateral BS), Pneumothorax (Deep sulcus sign in supine), CHF (Bat-wing appearance, Kerley B lines).
Acid-Base Analysis:
Step 1: pH (Acidosis < 7.4, Alkalosis > 7.4).
Step 2: Check pCO2 (Respiratory vs Metabolic).
Step 3: Anion Gap (Na - Cl - HCO3).
Mnemonics: MUDPILERS for high gap acidosis (Methanol, Uremia, DKA, Paraldehyde, Isoniazid, Lactic Acidosis, Ethylene Glycol, Salicylates).
V. Specialized Topics
Tracheostomy:
Timing: Early (1st week) reduces ICU stay and vent days but not mortality.
Acute Pancreatitis: Management (fluids, pain control).
Renal Replacement Therapy: Indications for dialysis in ICU.
Electrolytes: Management of severe abnormalities (Na, K, Ca, Mg).
Presentation: ICU Resident Crash Course
Slide 1: Introduction to the ICU Manual
Target Audience: Resident Trainees at BMC.
Goal: Safe, evidence-based management of critically ill patients.
Tools: Summaries, Protocols, Literature.
Slide 2: Oxygenation & Ventilation Basics
The Oxygen Equation:
Oxygen is carried by Hemoglobin (major) and dissolved in plasma (minor).
DO2
(Delivery) = Content
×
Cardiac Output.
Ventilator Initiation:
Volume Control (VCV).
TV: 6-8 ml/kg.
Goal: Rest muscles, prevent barotrauma.
Slide 3: ARDS Management
Definition: Diffuse lung injury, hypoxemia (PaO2/FiO2 < 200).
ARDSNet Protocol (Vital):
TV: 6 ml/kg Ideal Body Weight.
Keep Plateau Pressure < 30 cmH2O.
Permissive Hypercapnia (let pH drop a bit to save lungs).
Rescue Therapy: Prone positioning, High PEEP, Paralytics.
Slide 4: Weaning Strategies
Daily Assessment: Is the patient ready?
Spontaneous Breathing Trial (SBT): Disconnect pressure support/PEEP for 30 mins.
Passing SBT? Check cuff leak before extubation.
Risk: Laryngeal edema (stridor). Treat with steroids (Solumedrol).
Slide 5: Sepsis & Shock
Time is Life:
Antibiotics: Immediately (Broad spectrum).
Fluids: 30cc/kg bolus (or 2-3L).
Pressors: Norepinephrine if MAP < 60.
Avoid: High doses of steroids unless pressor-refractory.
Slide 6: Vasopressors Cheat Sheet
Norepinephrine: Go-to for Sepsis.
Dopamine: "Renal dose" myth? Low dose may not help kidneys significantly; high dose acts like Norepi.
Phenylephrine: Good for "warm shock" or neurogenic shock.
Dobutamine: Makes the heart squeeze harder (Inotrope).
Slide 7: Reading the CXR
Systematic Approach: Don't miss the tubes!
Common Pitfalls:
Pneumothorax: Look for "Deep Sulcus Sign" in supine patients.
CHF: "Bat wing" infiltrates, enlarged cardiac silhouette.
Lines: ETT tip should be above carina; Central line in SVC.
Slide 8: Acid-Base Disorders
The "Gap":
Na−Cl−HCO3
. Normal is 12-18.
High Gap Mnemonic: MUDPILERS
Methanol
Uremia
DKA
Paraldehyde
Isoniazid
Lactic Acidosis
Ethylene Glycol
Renal Failure
Salicylates
Slide 9: Special Procedures
Tracheostomy:
Benefits: Comfort, easier weaning.
Early vs Late: Early reduces vent time.
Massive PE:
Hypotension? Give TPA (Thrombolytics).
Bleeding risk? IVC Filter.
Review Questions
What is the "ARDSNet" tidal volume goal, and why is it used?
Answer: 6 ml/kg of ideal body weight. It is used to prevent barotrauma (lung injury) caused by overstretching alveoli.
A patient has a pH of 7.25, low HCO3, and a calculated Anion Gap of 20. What is the mnemonic used to remember the causes of this condition?
Answer: MUDPILERS (High Anion Gap Metabolic Acidosis).
Name the first-line vasopressor for a patient in septic shock.
Answer: Norepinephrine.
What are the criteria for performing a "Cuff Leak Test"?
Answer: It is performed before extubation (usually for patients intubated > 2 days) to assess for laryngeal edema and risk of post-extubation stridor.
According to the manual, how does mortality change with the timing of antibiotics in septic shock?
Answer: Mortality increases by approximately 7% for every hour of delay in administering antibiotics.
What specific finding on a Chest X-Ray in a supine patient suggests a pneumothorax?
Answer: The "Deep Sulcus Sign" (a deep, lucent costophrenic angle).... |