No More Worries!

image Our orders are delivered strictly on time without delay

Paper Formatting

  • Double or single-spaced
  • 1-inch margin
  • 12 Font Arial or Times New Roman
  • 300 words per page

No Lateness!

image Our orders are delivered strictly on time without delay

Our Guarantees

image

  • Free Unlimited revisions
  • Guaranteed Privacy
  • Money Return guarantee
  • Plagiarism Free Writing

Atrioventricular Conduction Block

Charles Doucette, who is 68 years old, retired from a middle management position in the automotiveindustry following an acute myocardial infarction. He was recovering in a local hospital, where the physicians closely monitored his ECG .

Mr. Doucette’s PR intervals were normal and his QRS complexes had a normal configuration.

However, occasional P-waves occurred that were not followed by QRS complexes (nonconducted P-waves). He fainted twice in the hospital. The physicians believed that the myocardial infarction caused a block in his AV conduction system called a Mobitz type II AV block. Since Mr. Doucette’s conduction block could become more severe, his physicians planned to treat him by implanting a pacemaker.

Questions

  1. Describe and explain the physiology of the waves and intervals of the normal ECG.
  2. What does the PR interval on the ECG represent? What units are used to express the PR interval? What is the normal value?
  3. What does the term “conduction velocity” mean, as applied to myocardial tissue? What is the normal conduction velocity through the AV node? How does conduction velocity in the AV node compare with conduction velocity in other portions of the heart?
  4. How does AV nodal conduction velocity correlate with PR interval? Since Mr. Doucette’s physicians believe he has a block in his AV conduction system, why are his PR intervals normal (rather than increased)?
  5. What does the QRS complex on the ECG represent? What is implied in the information that the QRS complexes on Mr. Doucette’s ECG had a normal configuration?
  6. How is it possible to have a P-wave that is not followed by a QRS complex, as seen on Mr. Doucette’s ECG? Propose a mechanism to explain the P-wave that is not followed by a QRS complex.
  7. Why did Mr. Doucette faint?

Sample Solution

h it had attracted advocates for a long time, now came into full vogue and continued to dominate economic thinking. Discovery introduced Europe to new foods and beverages. Coffee, from Ethiopia, had been consumed in Arabia and Egypt before its wide European use began in the 17th century. Tobacco, an American plant smoked by Indians, won an Old World market despite many individual objectors; the same proved true of chocolate from Mexico and tea from Asia. The South American potato became a staple food in such places as Ireland and central Europe. Cotton, from the Old World, took firm root in the New, from which Europe received an enormously increased supply. Sugar, introduced to the American tropics, along with its molasses and rum derivatives, in time became the principal exports of those regions. Spice was certainly more plentiful than before the discoveries, though the Dutch, when they controlled the East Indies, were able to limit production and thus to keep the price of cloves and nutmegs high. The influence of the discoveries permeated literature. Sir Thomas More’s Utopia, printed in 1516 and dealing with an imaginary island, was suggested by South America. The Portuguese poet Luís de Camões recounted the voyage of Vasco da Gama, though fancifully, in epic verse. Michel de Montaigne discoursed upon American savages, some of whom he had seen in France. Christopher Marlowe’s drama Tamburlaine (1587), though based on the life of the Asiatic conqueror, was an exhortation to his fellow Englishmen to penetrate the New World. Historiography acquired a broader base by taking the newly discovered lands into account. Astronomy was revolutionized by European penetration of the Southern Hemisphere and discovery of constellations unknown before. Map makers, typified by the Fleming Gerardus Mercator and the Dutchman Abraham Ortelius, portrayed the world in terms that are still recognizable. Colonies from northern Europe and mercantilism (17th century) The northern Atlantic powers, for understandable reasons, acquired no permanent overseas possessions before 1600. The United Provinces of the Netherlands spent the final decades of the 16th century winning independence from Spain; France had constant European involvements and wars of religion; England, matrimonially allied wit
PLACE AN ORDER NOW

Price Calculator

Subject:
Type:
Pages/Words:
Single spaced
approx 275 words per page
Urgency:
Level:
Currency:
Total Cost:

12% Discount

image

  • Research Paper Writing
  • Essay Writing
  • Dissertation Writing
  • Thesis Writing

Why Choose Us

image

  • Money Return guarantee
  • Guaranteed Privacy
  • Written by Professionals
  • Paper Written from Scratch
  • Timely Deliveries
  • Free Amendments