According to Practical Clinical Skills, reading a telemetry strip, or an electrocardiogram, begins with understanding the events that a normal electrocardiogram tracing represents. Once a person has a good grasp of this concept, it is possible to move on to interpreting the heart rate and rhythm and detecting abnormalities. However, it takes time and a good deal of practice to perfect the technique.Know More
Practical Clinical Skills explains that a normal EKG tracing represents the waveforms created by the electrical activity of the heart muscle as it beats one time. It begins with the "P" wave, which is normally deflected upward and represents atrial depolarization, the electrical event that initiates the beat. The "P" wave is followed by the QRS complex, which represents the depolarization and contraction of the left ventricle or the actual pumping action of the heart. It begins with the "Q" wave, which deflects downward and is followed by a large upward deflection, the "R" wave. The "R" wave is then followed by a larger downward deflection, the "S" wave and a small upward-deflected "T" wave, which represents repolarization or the heart's return to a resting state.
In some tracings, a last wave, known as the "U" wave, may be visible. This represents the recovery of specialized fibers within the heart muscle, known as the Purkinje fibers, which are responsible for synchronizing the heartbeat. The intervals between the various waveforms, their shape and their size are important indicators of how the heart muscle is functioning and a person's overall health, according to Practical Clinical Skills.Learn more about Diagnostics & Imaging
A TB skin test is read between 48 and 72 hours after administering the injection by measuring the size of any swelling found at the site of the test. If little or no swelling is present, the test is negative, according to the Centers for Disease Control.Full Answer >
WebMD explains that to measure blood pressure at home, the proper equipment is needed. Home blood pressure monitors are available in the traditional arm-cuff model and in a wrist model.Full Answer >
A normal muscle at rest does not show any electrical activity on an electromyography, or EMG recording, but when the muscle contracts, it shows electrical activity as a smooth action potential, or wave line, states Healthgrades. The action potential's size and shape reveals the muscle's response to its controlling nerve.Full Answer >
An NMR spectrum is read by determining the value of the chemical shifts of protons in a solution compared to a reference compound. The most common NMR reference compound is tetrametylsilance, or TMS, which has a signal of 0.00 ppm on the delta scale, according to Chemguide.Full Answer >