P-R interval - ορισμός. Τι είναι το P-R interval
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Τι (ποιος) είναι P-R interval - ορισμός

METHOD TO RECORD THE ELECTRICAL ACTIVITY OF THE HEART THROUGH PASSIVE ELECTRODES PLACED OVER THE SKIN.
EKG; Electrocardiograph; Isoelectric line; Electrokardiogram; Elektrokardiogramm; Electrocardiography, ambulatory; Electrocardiograms; Electrocardiographic; Ecg; Electro-Cardio Gram; 12 lead; ECG interpretation tips; Electrocardiogram; ECG; P-R interval; 12-lead ECG; 12 lead ECG; Lead aVF; Lead aVR; Lead aVL; Precordial lead; Cardiac axis; Heart axis; HV interval; H deflection; H-V interval; Precordial leads; Fetal electrocardiography; Foetal scalp electrode; Fetal scalp electrode; Fetal ECG; Fetal electrocardiogram; Ekg; Contiguous lead; Contiguous leads; Electrocardiogram track; Atrial depolarization; Normal ECG; Intracardiac electrogram; Wilson's central terminal; Wilson central terminal; Ventricular depolarization; Ventricular repolarization
  • A 12-lead ECG of a 26-year-old male with an incomplete [[right bundle branch block]] (RBBB)
  • Formation of limb waveforms during a pulse
  • ECG from 1957
  • Diagram showing the contiguous leads in the same color in the standard 12-lead layout
  • Measuring time and voltage with ECG graph paper
  • vector]]
  • Animation of a normal ECG wave
  • A patient undergoing an ECG
  • Schematic representation of a normal ECG
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  • An EKG electrode
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  • The limb leads and augmented limb leads (Wilson's central terminal is used as the negative pole for the latter in this representation)
  • Normal 12-lead ECG
  • real time monitoring]] of the heart in an [[intensive care unit]] in a German hospital (2015), the monitoring screen above the patient displaying an electrocardiogram and various values of parameters of the heart like heart rate and blood pressure
  • Placement of the precordial electrodes
  • Diagram showing how the polarity of the QRS complex in leads I, II, and III can be used to estimate the heart's electrical axis in the frontal plane.
  • An early commercial ECG device (1911)

simple interval         
  • b}}-major]] scale[[File:Ab major scale.mid]]
  • Ascending and descending chromatic scale on C[[File:ChromaticScaleUpDown.ogg]]
  • Enharmonic tritones: A4 = d5 on C[[File:Tritone on C.mid]]
  • Main intervals from C[[File:Intervals.mid]]
  • natural}}).[[File:Pythagorean comma on C.mid]]
  • Simple and compound major third[[File:Simple and compound major third.mid]]
  • Division of the measure/chromatic scale, followed by pitch/time-point series[[File:Time-point series.mid]]
PHYSICAL QUANTITY; RATIO BETWEEN TWO SONIC FREQUENCIES, OFTEN MEASURED IN CENTS, A UNIT DERIVED FROM THE LOGARITHM OF THE FREQUENCY RATIO
Musical interval; Simple and compound intervals; Compound interval; Perfect interval; Interval strength; Melodic interval; Vertical (music); Simple interval; Musical intervals; Harmonic Interval; Harmonic interval; Interval Pairs; Intervals (music); Music intervals; Interval root; Compound intervals; Perfect intervals; Minor interval; Major interval; Imperfect interval; Twelfth (music); Interval number; Interval quality; Sixth interval; Root (interval); Ratio (music); Musical ratio; Interval name; Interval (musical); Music interval
¦ noun Music an interval of one octave or less.
compound interval         
  • b}}-major]] scale[[File:Ab major scale.mid]]
  • Ascending and descending chromatic scale on C[[File:ChromaticScaleUpDown.ogg]]
  • Enharmonic tritones: A4 = d5 on C[[File:Tritone on C.mid]]
  • Main intervals from C[[File:Intervals.mid]]
  • natural}}).[[File:Pythagorean comma on C.mid]]
  • Simple and compound major third[[File:Simple and compound major third.mid]]
  • Division of the measure/chromatic scale, followed by pitch/time-point series[[File:Time-point series.mid]]
PHYSICAL QUANTITY; RATIO BETWEEN TWO SONIC FREQUENCIES, OFTEN MEASURED IN CENTS, A UNIT DERIVED FROM THE LOGARITHM OF THE FREQUENCY RATIO
Musical interval; Simple and compound intervals; Compound interval; Perfect interval; Interval strength; Melodic interval; Vertical (music); Simple interval; Musical intervals; Harmonic Interval; Harmonic interval; Interval Pairs; Intervals (music); Music intervals; Interval root; Compound intervals; Perfect intervals; Minor interval; Major interval; Imperfect interval; Twelfth (music); Interval number; Interval quality; Sixth interval; Root (interval); Ratio (music); Musical ratio; Interval name; Interval (musical); Music interval
¦ noun Music an interval greater than an octave.
Interval (mathematics)         
  • The addition ''x'' + ''a'' on the number line. All numbers greater than ''x'' and less than ''x'' + ''a'' fall within that open interval.
IN MATH, A SET OF REAL NUMBERS IN WHICH ANY NUMBER THAT LIES BETWEEN TWO NUMBERS IN THE SET IS ALSO INCLUDED IN THE SET
Interval on the real line; Closed interval; Open interval; Interval (analysis); Half-open interval; Half-closed interval; Interval notation; Interval of the real line; Bounded interval; Semi-open interval; Dyadic interval; Interval Notation; Range notation; Degenerate interval; Values interval; Subinterval; Open Interval; Proper subinterval; Endpoints (interval); Nondegenerate interval; Non-degenerate interval
In mathematics, a (real) interval is a set of real numbers that contains all real numbers lying between any two numbers of the set. For example, the set of numbers satisfying is an interval which contains , , and all numbers in between.

Βικιπαίδεια

Electrocardiography

Electrocardiography is the process of producing an electrocardiogram (ECG or EKG ), a recording of the heart's electrical activity through repeated cardiac cycles. It is an electrogram of the heart which is a graph of voltage versus time of the electrical activity of the heart using electrodes placed on the skin. These electrodes detect the small electrical changes that are a consequence of cardiac muscle depolarization followed by repolarization during each cardiac cycle (heartbeat). Changes in the normal ECG pattern occur in numerous cardiac abnormalities, including cardiac rhythm disturbances (such as atrial fibrillation and ventricular tachycardia), inadequate coronary artery blood flow (such as myocardial ischemia and myocardial infarction), and electrolyte disturbances (such as hypokalemia and hyperkalemia).

Traditionally, "ECG" usually means a 12-lead ECG taken while lying down as discussed below. However, other devices can record the electrical activity of the heart such as a Holter monitor but also some models of smartwatch are capable of recording an ECG. ECG signals can be recorded in other contexts with other devices.

In a conventional 12-lead ECG, ten electrodes are placed on the patient's limbs and on the surface of the chest. The overall magnitude of the heart's electrical potential is then measured from twelve different angles ("leads") and is recorded over a period of time (usually ten seconds). In this way, the overall magnitude and direction of the heart's electrical depolarization is captured at each moment throughout the cardiac cycle.

There are three main components to an ECG: the P wave, which represents depolarization of the atria; the QRS complex, which represents depolarization of the ventricles; and the T wave, which represents repolarization of the ventricles.

During each heartbeat, a healthy heart has an orderly progression of depolarization that starts with pacemaker cells in the sinoatrial node, spreads throughout the atrium, and passes through the atrioventricular node down into the bundle of His and into the Purkinje fibers, spreading down and to the left throughout the ventricles. This orderly pattern of depolarization gives rise to the characteristic ECG tracing. To the trained clinician, an ECG conveys a large amount of information about the structure of the heart and the function of its electrical conduction system. Among other things, an ECG can be used to measure the rate and rhythm of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart's muscle cells or conduction system, the effects of heart drugs, and the function of implanted pacemakers.