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Episode 61
DIP Episode 61 - Cardiac Pharmacology Part 2
PharmacologyMedium4 - HighHas Q&A
Step 1Step 2Step 3COMLEXMedicineUSMLEStep 1Step 2Step 3
Topic
Cardiac antiarrhythmics (Class I, II, III, IV); Rate control agents; Positive inotropes and vasodilators; Cardiac stress testing principles.
Key Takeaway
The management of cardiac arrhythmias requires understanding the specific mechanisms of action—such as {Na}^+/{K}^+ ATPase inhibition by Digoxin (positive inotropy) or late sodium channel blockade by Ranolazine (diastolic relaxation)—and recognizing drug-drug interactions, particularly with potassium levels and iodine load.
Runtime: 39.6 min
Published: 2018-11-07
Completed audio: Yes
Completed notes: No
Anki made: Yes
Section: CARDIOLOGY, PHARMACOLOGY
Episode Notes
⚠️
Trap 3 (SVT Termination): Thinking that all rate control agents can terminate SVT. Reality: Adenosine's transient hyperpolarization is key for terminating AV nodal reentrant tachycardias (AVNRT/SVT).
OMM / COMLEX integration
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High-Yield Viscerosomatics, Autonomics & COMAT Shelf Clinical Pearls:
- Autonomic & Viscerosomatic Innervation (T1–T5): Sympathetic innervation to the heart originates from T1–T5. T1–T2 preferentially innervate the atria and SA node via the right cardiac plexus (supraventricular tachycardias), while T3–T5 innervate the ventricles via the left cardiac plexus (ventricular arrhythmias and ischemic changes). Parasympathetic innervation is mediated via the Vagus nerve (CN X) to the SA and AV nodes.
- Chapman Reflex Points: Anterior Chapman point for the myocardium is located at the 2nd intercostal space, adjacent to the sternum. The posterior Chapman point is located intertransverse between T2 and T3, midway between the spinous and transverse processes.
- Lymphatic & Biomechanical Optimization: Congestive heart failure and cardiogenic edema require opening the terminal lymphatic drainage pathway at the left thoracic inlet (Sibson fascia). Normalizing upper thoracic somatic dysfunctions (T1–T4) and exhalation rib restrictions reduces afterload and autonomic stress on the myocardium. Avoid aggressive thoracic lymphatic pumps during acute uncompensated pulmonary edema.