7.6.24

Quick Review #169 - #surgery #surgeon #doctorgallagher #oralsurgery #oralsurgeon #omfs #dentist #dentistry #dental #anesthesia #rbbb #lbbb #ekg #cardiology

Right Bundle Branch Block (RBBB):

Definition: RBBB occurs when there’s a delay or blockage in the electrical impulses that travel through the right bundle branch of the heart’s conduction system.

EKG Findings:

• QRS Duration: Prolonged (>120 ms).

• V1-V2 Leads (Right Precordial Leads): RSR’ pattern (rabbit ears).

• I, aVL, V5-V6 Leads (Left Lateral Leads): Broad S waves.

Clinical Significance:

• RBBB can be benign or associated with other heart conditions like pulmonary embolism, myocardial infarction, or chronic lung disease.

• It is not typically life-threatening by itself.

Left Bundle Branch Block (LBBB):

Definition: LBBB occurs when there’s a delay or blockage in the electrical impulses that travel through the left bundle branch.

EKG Findings:

• QRS Duration: Prolonged (>120 ms).

• V5-V6 Leads (Left Lateral Leads): Broad, notched (M-shaped) R waves.

• V1-V2 Leads (Right Precordial Leads): Deep S waves.

• ST Segment and T Wave: Discordant changes (ST segment and T wave deflections opposite to the QRS complex).

Clinical Significance:

• LBBB is often associated with underlying heart disease like hypertensive heart disease, coronary artery disease, cardiomyopathy, and can indicate a higher risk of adverse cardiovascular events.

• It may be life-threatening if associated with other serious heart conditions.

Characteristic Findings:

RBBB:

• QRS complex duration >120 ms.

• RSR’ pattern in V1-V2 (right precordial leads).

• Slurred S waves in leads I, aVL, V5-V6.

LBBB:

• QRS complex duration >120 ms.

• Broad, notched R waves in V5-V6.

• Deep S waves in V1-V2.

• Discordant ST-T changes.

References:

1. Wikipedia contributors. (2024, April). Bundle branch block. Wikipedia, The Free Encyclopedia. Retrieved July 6, 2024.

2. Lilly, L. S. (2016). Pathophysiology of Heart Disease: A Collaborative Project of Medical Students and Faculty (6th ed.). Lippincott Williams & Wilkins.

3. Surawicz, B., & Knilans, T. K. (2008). Chou’s Electrocardiography in Clinical Practice: Adult and Pediatric (6th ed.). Saunders.

4. ChatGPT. 2024. #podcast #podcasts #dentalpodcast #dentalpodcasts #doctorgallagherpodcast #doctorgallagherspodcast #doctor #dentistry #oralsurgery #dental #viral #dentalschool #dentalstudent #omfs #surgeon #doctorlife #dentistlife #residency #oralsurgeon #dentist #doctorgallagher