A 68-year-old man presents with a syndrome of alcohol withdrawal. ECG Shows?
**Core Concept**
The patient's presentation of alcohol withdrawal is associated with a specific ECG finding due to the body's response to the sudden cessation of alcohol consumption and the subsequent release of catecholamines. This leads to an increase in sympathetic activity, resulting in various physiological changes that can be reflected on an ECG.
**Why the Correct Answer is Right**
The patient's ECG is likely to show **sinus tachycardia**, which is a common finding in alcohol withdrawal. This occurs due to the increased sympathetic tone caused by the release of catecholamines, leading to an elevated heart rate. Additionally, the body's response to alcohol withdrawal can also lead to an increase in **QT interval**, which is a measure of the time it takes for the electrical impulse to travel through the ventricles of the heart. This is thought to occur due to the increased levels of **norepinephrine**, which can prolong the QT interval.
**Why Each Wrong Option is Incorrect**
* **Option A:** ST segment elevation is not a typical finding in alcohol withdrawal. This could be seen in conditions such as acute myocardial infarction or pericarditis.
* **Option B:** Atrial fibrillation is a type of arrhythmia that is not directly related to alcohol withdrawal. While it is possible for patients with alcohol withdrawal to develop arrhythmias, atrial fibrillation is not a typical finding.
* **Option C:** Left bundle branch block is a type of conduction abnormality that is not typically associated with alcohol withdrawal. This could be seen in conditions such as coronary artery disease or cardiomyopathy.
**Clinical Pearl / High-Yield Fact**
In patients with alcohol withdrawal, it's essential to monitor their ECG closely for signs of cardiac arrhythmias, as these can be a life-threatening complication. Additionally, patients with a history of alcohol use disorder should be screened for cardiac disease, as they are at an increased risk of developing cardiac complications.
**Correct Answer: A. Sinus tachycardia**