The ST segment is the line between the “S” and the “T” on the readout of an EKG. If a person is in good health, the line appears at or close to the baseline level. A depressed or elevated ST segment can mean a person has an underlying health condition.
An EKG creates a readout with what looks like a zig-zagging line moving up and down. The line has several plateaus, peaks, and values with P, Q, R, S, and T labels from left to right.
The ST segment occurs between the depression of S and the peaking of T on the readout. A generally flat line that occurs around the baseline indicates that a person has a good health status. However, a depressed ST segment may be due to an underlying health condition.
This article explains what a depressed ST segment is and considers the possible causes and treatments. It also looks at the outlook for people who receive this test result.
To many people, the readout that an EKG produces will just look like a scribbled line that goes up and down across graph paper or a screen.
However, doctors, nurses, and technicians can interpret this line, which shows the heart’s rhythm and electrical activity. They can use the EKG readout to look for abnormalities and help diagnose several potential underlying heart conditions, such as heart attack, heart blocks, and atrial or ventricular tachycardia, among others.
An EKG has several points representing different waves that appear above or below the baseline. There are three waves:
- P wave
- QRS complex
- T wave
The ST segment occurs between the end of the QRS complex and the start of the T wave.
In healthy individuals, the ST segment is generally flat and appears at or close to the baseline level, although variations
Several underlying conditions and other factors can cause an ST segment depression.
- Hypokalemia: Hypokalemia occurs when a person’s body excretes an
excessive amountof potassium. This can result in the person not having enough potassium in their blood, which can cause several symptoms, including muscle weakness that can lead to paralysis.
- Left bundle branch block: When this condition occurs, the electrical impulses to the heart’s left ventricle slow, which
can make it harderfor the heart to pump blood efficiently through the body.
- Myocardial ischemia: Myocardial ischemia is a term that describes an imbalance in the oxygen supply to the heart. An obstruction of blood flow to the heart can cause this condition. A partial or full blockage of the coronary artery can lead to a potentially fatal heart attack.
- Use of certain medications: Some medications that treat heart failure and arrhythmias, such as digitalis, can cause an ST segment depression.
The treatment options will vary depending on the exact underlying condition affecting the person.
Hypokalemia occurs as a symptom of another condition. A doctor will need to determine the underlying condition and provide treatment to address the root cause.
During treatment, they may recommend the use of potassium supplements or have the person include more potassium in their diet. In severe cases, they may prescribe potassium chloride, which comes in oral and IV forms.
Left bundle branch block treatment
Currently, no standard of care exists for left bundle branch blocks. Instead, a doctor will make recommendations for treating any underlying causes.
Experts at the
Myocardial ischemia treatment
Other therapies and medications that may help with myocardial ischemia include:
In some cases, if myocardial ischemia is responsible for an ST segment depression, a person may need to undergo
A person’s outlook is dependent on the underlying condition and their overall health. Some causes require only minimal intervention, such as medication or dietary changes, while others may require more intensive treatment.
A person can make some changes to improve their overall heart health. This may help reduce the risk of complications, such as stroke or heart attack. People can take steps to lower their risk of heart disease. These
- staying active or increasing their activity levels
- eating a nutritious, balanced diet
- reaching or maintaining a moderate weight
- quitting or not starting smoking
- moderating alcohol consumption or completely avoiding it
- practicing stress management techniques
Making these changes may help control blood pressure and cholesterol levels and decrease the risk of certain heart conditions that can lead to an ST segment depression or potentially fatal complications, such as a heart attack.
ST segment depression typically indicates that a person has an underlying condition that affects the heart. The condition may be relatively benign or potentially life threatening.
The treatment options typically involve medication and lifestyle changes. A person’s outlook will depend on several factors, including the underlying condition affecting them, their response to treatment, and their overall health.