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Electrocardiography (ECG)

Definition
Electrocardiography is the most invariably used experience for evaluating cardiac foothold, graphically history the electrical floating (electrical undeveloped) generated by the nature. This floating radiates from the nature in all directions and, on reaching the peel, is valued by electrodes united to an amplier and pull-off chart recorder. The scale relative ECG uses five electrodes to value the electrical undeveloped from 12 unanalogous manages; the scale constituent manages (I,II,III), the augmented constituent manages (aVf, aVL, and aVr), and the precordial, or chest, manages (V1 through V6). ECG tracings normally exist of three identifiable speedforms: the P speed, the QRS compound, and the T speed. The P speed depicts atrial depolarization; the QRS compound, ventricular depolarization; and the T speed, ventricular repolarization. Computerized ECG machines use slender electrode tabs that bark off a equivocation and amalgamate to the unrepining’s peel. The solid ECG tracing is displayed on a protect so abnormalities can be corrected antecedently printing; then it’s printed on one equivocation of brochure. Electrode tabs can stay on the unrepining’s chest, encounter, and legs to agree faithful manage establishment for serial ECG studies.
Purpose
  • To aid realize principal conduction abnormalities, cardiac arrhythmias, cardiac hypertrophy, pericarditis, electrolyte imbalances, myocardial ischemia, and the footing and space of myocardial infarction.
  • To adviser reinstatement from an MI.
  • To evaluate the productiveness of cardiac medication.
  • To assess pacemaker performance
  • To enumeadmonish productiveness of thrombolytic therapy and the unravelling of ST-section debasement or refinement and T-speed changes.
Procedure
Patient Preparation for Electrocardiography (ECG)
  1. Explain to the unrepining the want to lie quiet, recreate, and breathe normally during the act.
  2. Note floating cardiac refuse therapy on the experience ask devise as courteous as any other cohereed clinical notice, such as chest suffering or pacemaker.
  3. Explain that the experience is sufferingless and takes 5 to 10 minutes.
Implementation
  1. Place the unrepining in a listless or semi-Fowler’s collocation.
  2. Expose the chest, ankles, and wrists.
  3. Place electrodes on the interior countenance of the wrists, on the medical countenance of the inferior legs, and on the chest.
  4. After all electrodes are in establish, cohere the manage wires.
  5. Press the START nonentity and input any required notice.
  6. Make permanent that all manages are represented in the tracing. If not, enumeadmonish which electrode has succeed inexact, reattach it, and restart the tracing.
  7. All recording and other nearby electrical equipment should be suitably inaugurated.
  8. Make permanent that the electrodes are firmly resolute.
Nursing Interventions
  1. Discohere the equipment, abstract the electrodes, and abstract the gel after a while a fresh cloth towel.
  2. If the unrepining is having refloating chest suffering or if serial ECG’s are ordered, permission the electrode patches in establish.
Interpretations
Normal Results
  1. P speed that doesn’t exceed 2.5 mm (0.25 mV) in altitude or conclusive longer than 0.12 promote.
  2. PR season (includes the P speed plus the PR section) persisting for 0.12 to 0.2 promote for nature admonishs overhead 60 beats/min.
  3. QT season that varies after a while the nature admonish and conclusives 0.4 to 0.52 promote for nature admonishs overhead 60 beats/min.
  4. Voltage of the R speed manages V1 through V6 that doesn’t exceed 27 mm.
  5. Total QRS compound conclusiveing 0.06 to 0.1 promote.
Abnormal Results
  1. Myocardial infarction (MI), upupfair or left ventricular hypertrophy, arrhythmias, upupfair or left bundle-branch obstruct, ischemia, conduction defects or pericarditis, and electrolyte abnormalities.
  2. Abnormal speed devises during angina episodes or during employment.
Precautions
  • The recording equipment and other nearby electrical equipment should be suitably inaugurated to thwart electrical interference.
  • Double-check complexion codes and manage markings to be permanent cohereors hesitate.
  • Make permanent that the electrodes are firmly resolute, and reresolute them if inexact peel contiguity is hanging. Don’t use cables that are tamed, frayed, or inadequate.
Interfering Factors
  • Improper manage establishment.
Complications
  • Skin sensitivity to the electrodes.

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