Cardioversion by dc shock in this sentence whatsoever dc means refer from book of pharmacology by kd tripathi 9th edition
In "cardioversion by DC shock," DC stands for Direct Current. It refers to a unidirectional flow of electric current (as opposed to AC - alternating current). A controlled DC shock is delivered to the heart to reset abnormal rhythms like atrial fibrillation back to normal sinus rhythm.
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KD Tripathi pharmacology DC cardioversion direct current shock meaning
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DC in "Cardioversion by DC Shock" - KD Tripathi Pharmacology
DC = Direct Current
In the phrase "cardioversion by DC shock," DC stands for Direct Current - a unidirectional, constant-polarity electrical current (as opposed to AC, alternating current, which periodically reverses direction).
What is DC Cardioversion?
A DC shock delivers a brief, high-energy pulse of direct current electricity through electrode paddles (or adhesive pads) placed on the chest wall. This simultaneous depolarization of a critical mass of cardiac myocytes interrupts a chaotic or re-entrant arrhythmia and allows the sinoatrial (SA) node - the heart's natural pacemaker - to re-establish normal sinus rhythm.
Key technical features:
- The shock is synchronized to the R-wave of the ECG (to avoid delivering the shock during the vulnerable T-wave period, which could trigger ventricular fibrillation) - this is called synchronized DC cardioversion
- For ventricular fibrillation, an unsynchronized shock is used - this is called defibrillation
The Exact Context in KD Tripathi (Digitalis Toxicity Chapter)
The sentence you encountered comes directly from the chapter on Cardiac Glycosides / Digitalis in KD Tripathi's Essentials of Medical Pharmacology. The full context reads:
"Cardioversion by DC shock is contraindicated because severe conduction defects may be unmasked in the digitalis intoxicated heart."
This means: in a patient with digitalis (digoxin) toxicity, delivering a DC electrical shock to restore rhythm is dangerous because:
- Digitalis already causes increased intracellular calcium and increased automaticity
- A DC shock in this setting can precipitate severe, life-threatening ventricular arrhythmias (ventricular tachycardia or ventricular fibrillation) by unmasking latent conduction defects
- The already-irritable myocardium is highly susceptible to the pro-arrhythmic effect of the shock
Summary Table
| Term | Full Form | Meaning |
|---|---|---|
| DC | Direct Current | Unidirectional electrical current |
| DC Shock | Direct Current Shock | Brief high-energy electrical discharge to the heart |
| Cardioversion | - | Restoration of normal sinus rhythm using electrical shock |
| DC Cardioversion | Direct Current Cardioversion | Synchronized DC shock to terminate arrhythmias (AF, atrial flutter, SVT) |
| Defibrillation | - | Unsynchronized DC shock for VF/pulseless VT |
So in short: DC = Direct Current, and "cardioversion by DC shock" simply means using a controlled burst of direct current electricity to reset the heart's rhythm. KD Tripathi uses this term specifically in the context of digitalis toxicity, where this procedure is contraindicated.
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