The Ultimate ECG Technician Certification Exam Quiz

The given statement is true. Myocardial Infarction, also known as a heart attack, happens when there is a blockage in the blood flow to the heart muscle. This blockage can occur due to the narrowing or complete blockage of the coronary arteries that supply oxygen-rich blood to the heart. When the blood flow is interrupted or reduced for a prolonged period, it can lead to the death of heart muscle cells, causing a heart attack.

The ST segment is the pause between ventricular depolarization and ventricular repolarization. It represents the time when the ventricles are completely depolarized and preparing for repolarization. During this phase, the ventricles are relaxed and ready to receive the next electrical signal for contraction. Monitoring the ST segment on an electrocardiogram (ECG) can provide important information about the health of the heart, as changes in the ST segment can indicate ischemia or injury to the heart muscle.

The small squares horizontally on the EKG paper are equal to 0.04 seconds.

All of these options are major stages of activity in the cardiac cycle. Inflow refers to the phase where blood flows into the heart chambers, isovolumic relaxation is the period of relaxation when the heart chambers are not contracting and blood volume remains constant, and ejection is the phase when blood is pumped out of the heart chambers. Therefore, all three options are correct and represent different stages of the cardiac cycle.

The sinoatrial node, also known as the pacemaker of the heart, is located in the right atrium. It is responsible for initiating electrical impulses that regulate the heart's rhythm and coordinate its contractions.

The correct ratio of breaths to compressions in CPR is 2 breaths to 30 compressions. This means that after every 30 compressions, two breaths should be given to the person in need of CPR. This ratio ensures that there is an adequate balance between chest compressions to circulate blood and breaths to provide oxygen to the person's lungs.

The QRS complex represents the depolarization of the ventricles. Depolarization is the electrical activation of the heart muscle cells, causing them to contract. The QRS complex is a waveform on an electrocardiogram (ECG) that represents the spread of electrical activity through the ventricles. It begins with the depolarization of the interventricular septum (septal depolarization) and continues with the depolarization of the ventricular walls. This electrical activity leads to the contraction of the ventricles, which pumps blood out of the heart and into the circulatory system.

Cardiac output refers to the amount of blood that is pumped into the aorta by the heart per minute. It is a measure of the efficiency of the heart in delivering oxygenated blood to the body's tissues. Stroke volume, on the other hand, refers to the amount of blood pumped out of the heart with each contraction. Venous volume is the amount of blood present in the veins, while ejection fraction is the percentage of blood pumped out of the heart with each contraction.

Sodium is the major extracellular ion because it is the most abundant positively charged ion outside the cell. It plays a crucial role in maintaining fluid balance, transmitting nerve impulses, and regulating blood pressure. Sodium is actively transported out of cells and is primarily found in the extracellular fluid, while potassium is the major intracellular ion. Magnesium and calcium are also important ions in the body, but they are not as abundant in the extracellular fluid as sodium.

The correct lead for the 5th intercostal space, midaxillary line on the left side is V6. This is because V6 is positioned in the midaxillary line at the same level as the 5th intercostal space. The V leads in the ECG represent specific positions on the chest where the electrical activity of the heart is measured. The V6 lead is commonly used to assess the electrical activity of the left ventricle and is placed in the midaxillary line at the level of the 5th intercostal space.

The term "segment" refers to the waveforms in the middle of the lines. This suggests that there are distinct sections or portions within the lines that can be identified as separate entities. The other options, such as "waveform," "interval," and "complex," do not specifically indicate this concept of distinct sections within the lines. Therefore, "segment" is the most appropriate term for describing the waveforms in the middle of the lines.

Potassium is the major intracellular ion because it plays a crucial role in maintaining the electrical potential across cell membranes. It is involved in various cellular processes such as nerve impulse transmission, muscle contraction, and maintaining fluid balance. Potassium is found in high concentrations inside cells, while sodium is primarily found outside the cells. This concentration gradient allows for the generation of action potentials and other important cellular functions. Magnesium is also an important intracellular ion, but it is not the major one. Therefore, the correct answer is Potassium.

The PR segment refers to the depolarization of the AV node and its delay, as well as the depolarization of the Bundle of His and Bundle branches. This segment represents the time it takes for the electrical signal to travel from the atria to the ventricles, allowing for coordinated contraction and efficient pumping of blood. It is an important part of the electrical conduction system of the heart.

A normal, healthy heart typically beats at a rate of 72 cardiac cycles per minute. This is considered the average resting heart rate for adults. Cardiac cycles refer to the complete sequence of events that occur during one heartbeat, including the contraction and relaxation of the heart muscles. Therefore, the correct answer is 72 cardiac cycles.

Ventricular diastole refers to the phase of the cardiac cycle when the ventricles are relaxed and filling with blood. During this phase, the ventricles are not contracting but rather passively receiving blood from the atria. Filling time, therefore, accurately describes this phase as it represents the duration during which the ventricles are being filled with blood before the next contraction occurs.