DIP Episode 613 - Peri-operative Medicine (Social Sciences)

Source / episode info

• Episode: 613
• Title: DIP Ep 613: Peri-operative Medicine (Social Sciences)
• Published: 2025-07-13
• Source: Episode page

One-liner

Episode 613 is a comprehensive review of perioperative medicine, covering diabetic management (insulin use), screening for atlantoaxial instability in RA patients, managing anticoagulation and antiplatelets, administering stress doses of steroids for HPA axis suppression, preventing aspiration pneumonia, and recognizing critical intra- and pre-operative complications like thyroid storm and malignant hyperthermia.

High-yield summary

• Diabetic Management: For preoperative glucose control, use insulin; maintain blood glucose levels < 180 mg/dL. Hold oral hypoglycemic agents (e.g., Metformin) due to risk of lactic acidosis or kidney injury.
• Musculoskeletal Risk: Patients with Rheumatoid Arthritis, Down Syndrome, or Ankylosing Spondylitis require screening for Atlantoaxial Instability (C1-C2 subluxation) via a preoperative cervical X-ray before intubation/surgery.
• Endocrine Stress Dosing: Any patient undergoing surgery who has chronic steroid use (e.g., GCA) or primary adrenal insufficiency requires a stress dose of corticosteroids to prevent iatrogenic adrenal crisis due to HPA axis suppression.
• Anticoagulation Protocol: Preoperative antiplatelet/anticoagulant agents (Warfarin, Aspirin, Clopidogrel) should generally be held due to bleeding risk, but the patient must be bridged with Heparin. Exception: Continue aspirin if a coronary stent is present.
• Aspiration Risk: Increased risk factors include altered mental status (alcoholism, stroke), chronic opioid use, diabetic gastroparesis, and high-diverticulum hernia; NPO status prevents aspiration.

Learning objectives

• Identify specific preoperative screening tests for patients with connective tissue disorders (RA, Down Syndrome).
• Determine appropriate glucose management strategies in the perioperative setting using insulin protocols.
• Select correct prophylactic antibiotics and timing for dental/cardiac surgery based on risk factors.
• Recognize indications for stress dosing of corticosteroids in HPA axis suppression states.
• List critical contraindications to TPA (e.g., SBP > 180 mm Hg) and manage high-risk bleeding patients with anticoagulation bridging.

Board exam buzzwords

Rapid review table

Board-speak -> diagnosis

Differential diagnosis / distinguishing features

Adrenal Insufficiency Crisis

Cardiac Antiplatelet Management

Management pearls

• Preoperative Antibiotics: For dental procedures in high-risk patients (prosthetic valve, history of endocarditis), administer prophylactic antibiotics (e.g., cephalosporin) 30–60 minutes before the procedure begins.
• Stress Dosing Steroids: Always consider stress dosing steroids for any patient with chronic exogenous glucocorticoid use or primary adrenal insufficiency undergoing surgical stress.
• MI Delay: Elective surgery following an MI/coronary intervention must be delayed by at least 60 days to minimize cardiac risk.
• Beta-blocker Continuation: Patients with stable coronary artery disease can generally continue beta-blockers perioperatively, as they decrease mortality and cardiac events.

Don't miss

Integration & clinical reasoning

• Endocrine Integration: Perioperative management requires coordinating care across endocrine systems: managing steroid withdrawal (adrenal crisis), thyroid function (hypocalcemia risk), and metabolic stress (glucose control).
• Cardiology/Surgery Integration: The timing of surgery post-MI (60 days) and the need to manage antiplatelet agents are critical surgical considerations that directly impact cardiac stability.
• Rheumatology/Neurosurgery Integration: Recognizing atlantoaxial instability in inflammatory arthritides (RA, AS) is crucial for safe airway management during intubation.

OMM / COMLEX integration

• Standard emergency management takes priority over OMT in acute crises (e.g., septic shock, MI). However, the concept of "stress" and systemic inflammatory response syndrome (SIRS) is relevant to understanding why perioperative patients are vulnerable.
• The principle of minimizing metabolic stress and maintaining homeostasis aligns with general principles of holistic care; however, specific medical protocols (like stress dosing steroids) must always supersede OMT advice in acute settings.

Concept connections / cross-references

• For detailed information on endocrine emergencies and adrenal insufficiency, see [Episode 123].
• For comprehensive coverage of cardiac anatomy and MI complications, review [Episode 456].
• For general guidelines on antibiotic prophylaxis and infection control, refer to [Episode 789].

High-yield association table

Key terms glossary

Study optimization

Question pattern recognition

• Pattern: Patient with RA or Down Syndrome requiring intubation -> Suspect Atlantoaxial Instability -> Pre-op Cervical X-ray is mandatory.
• Pattern: Diabetic patient undergoing surgery -> Use insulin; hold oral agents (Metformin) -> Goal glucose < 180 mg/dL.
• Pattern: Patient with chronic steroid use or primary adrenal insufficiency + Surgery -> Stress Dose Steroids are required to prevent adrenal crisis.

Test yourself

Common mistakes to avoid

Common traps