A patient with an acute MI has sinus tachycardia of 126 bpm. The nurse recognizes that if this d

First, letu0027s understand what sinus tachycardia is. Sinus tachycardia is a fast heart rate that o

A patient with an acute MI has sinus tachycardia of 126 bpm....

A patient with an acute MI has sinus tachycardia of $126 \mathrm{bpm}$. The nurse recognizes that if this dysrhythmia is not treated, the patient is likely to experience
a. hypertension.
b. escape rhythms.
c. ventricular tachycardia.
d. an increase in infarct size.

Key Concepts

Acute Myocardial Infarction (MI)

This refers to a condition where blood flow to part of the heart is suddenly blocked, leading to damage or death of heart muscle tissue. An MI is a critical event that disrupts the normal function and structure of the heart, making the myocardium more vulnerable to irregular electrical activity and complications if not managed appropriately.

Sinus Tachycardia

Sinus tachycardia is a normal increase in heart rate that originates from the sinoatrial node, the heart's natural pacemaker. It often occurs in response to stress, pain, or physiological demands such as after an MI, where increased sympathetic stimulation is present. However, prolonged sinus tachycardia can increase myocardial oxygen demand, potentially worsening cardiac ischemia.

Cardiac Dysrhythmia

Dysrhythmias are disturbances in the normal rhythm of the heart, and in the context of an MI, they are particularly concerning. The damaged or ischemic areas of the heart can create an abnormal electrical environment, increasing the risk of arrhythmic events which can compromise the heart's efficiency and further jeopardize patient stability.

Ventricular Tachycardia

Ventricular tachycardia is a type of rapid heart rhythm that originates from the ventricles, the lower chambers of the heart. It is a serious condition that can develop from various factors including increased heart rate and myocardial damage, as seen in an MI. Untreated tachycardia can lead to an increased risk of ventricular tachycardia, which may escalate into more dangerous dysrhythmias and compromise cardiac output.

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