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Instrument Exam 2 > ECG I > Flashcards

ECG I Flashcards

2
Q

What is monitoring?

A

Monitoring is making repeated or continuous observations or measurements of the patient, their physiologic function, and the function of life supporting equipment, for the purpose of guiding management decisions, including when to make therapeutic interventions and assessments of those interventions

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3
Q

What is electrocardiography?

A

Source of EMF in a 3-D space that is projected on planer surfaces

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4
Q

What three things do we look at on the ECG for anesthesia?

A

Rate rhythm ST segments

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5
Q

Where does the myocardial electrical activity start?

A

Initiates at the SA node

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6
Q

What does the SA node stand for and what does it mean?

A

Sinal atrial nodeMeans that the activity is sinus in rhythm

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7
Q

What is the electrically conductive tissue inside the body?

A

Volume conductorsIe. Blood, pericardial fluid, interstitial fluid

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8
Q

How does air and other gases affect conductivity?

A

Air acts as a block in conductance

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9
Q

True or false: pores and capacitive coupling provide electrical access to the volume conductors from outside the body.

A

True

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10
Q

How are the half cell potentials that are produced between the skin and electrodes overcome?

A

By using amplifiers so that the half cell potentials are canceled out or blocked

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11
Q

Which amplifier is used so that the effects of the two half cell potentials are canceled out

A

Differential input DC amplifier

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12
Q

Which amplifier is used so that the DC voltage is blocked?

A

AC coupled amplifier

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13
Q

What type of amplifiers or most used in the OR today?

A

AC coupled differential amplifiers

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14
Q

Because of their stable half cell potential which electrodes are used in most medical applications

A

Silver-silver chloride (Ag-AgCl)

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15
Q

What is the most common mechanism that creates artifact signals?(That is signal’s that could possibly obscured the real signal)

A

Electrode slippage

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16
Q

What is the most common type of electrode used today?

A

Column electrodesThese keep the electrode at a fixed distance from the skin

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17
Q

What is one of the original type of electrodes used that connects a metallic plate that is held to the skin by rubber strap

A

Plate electrodes

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18
Q

What is an original type of electrode that is similar to the plate electrodes but most often is used as a chest electrode

A

Suction cup electrodes

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19
Q

What was the main difference in the plate electrodes and the suction cup electrodes

A

The plate electrodes went on the extremitiesThe suction cup most often went to the patient’s chest

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20
Q

EEG electrodes are much more sensitive than ECG electrodes because of what

A

Because the typical EEG electrodes are either a needle or a concave disk made of either gold or silver that is held by thick paste that is more conductive than what is used on the ECG

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21
Q

The “backpack” electrodes and the MRI electrodes have which side effect

A

They are not good for ST monitoring

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22
Q

What is the standard range of width of the clinical electrode used today

A

1 cm

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23
Q

The first electrometer used in 1887 by Agustus Waller used what

A

A 20 µ glass capillary tube filled with Mercury and was floating in sulfuric acid

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24
Q

What is a transmembrane action potential

A

A potential across a cell membrane where voltage is changing over time

25
Q

Waller’s pet bulldog was named what

A

Jimmie

26
Q

True or False: Einthoven’s Galvanometer required the patient to be hooked to electrodes and the hands and extremities to be placed in jars of salt solutions

A

True

27
Q

Who in 1928 applied electronic amplification to the signal thus replacing the string galvanometer

A

Ernestine and Levine

28
Q

Who in 1924 was credited with recognizing the vast potential importance of the ECG as a diagnostic and investigative tool

A

Einthoven

29
Q

True or false, when depolarization occurs of a polarized cell, the cell becomes electronegative on the outside and positive on the inside, thus switching polarity

A

Tue

30
Q

The magnitude of the electrical potential of a cell is given by what equation

A

The Nernst equationEMF = -60ln {ion (out) / ion (in) }

31
Q

What is the common baseline starting millivolts for most cells

A

-70 to -90

32
Q

Look at the transmembrane potential on page 15

A

Or if someone can add it in I do not know how

33
Q

At resting state what ions are in the cytoplasm and what ions are in the extracellular fluid

A

K is in the cytoplasmNa is majority outside cell

34
Q

What phase is depolarization of the cell

A

Phase 0

35
Q

During phase 0 what is the movement of ions across the cell membrane

A

Na inside the cell

36
Q

What is the net movement of ions across the cell membrane in phase 1

A

K outCl in

37
Q

What is the net movement of ions across the cell membrane in phase 2

A

Calcium inK out

38
Q

What phase does repolarization take place

A

Phase 3

39
Q

During phase 3, What is the net movement of ions across the cell membrane

A

K out

40
Q

How many total phases are there in the transmembrane potential

A

4

41
Q

What phase is most closely resemble to the resting state

A

Phase 4

42
Q

True or false electrical activity always precedes mechanical activity in the heart

A

True is actually about 150 ms

43
Q

All heart activity we measure should be what kind of action potential

A

A biphasic action potential

44
Q

What theory states that the ECG is a result of temporal and spatial summation Of electrical activity of the heart as seen by electrodes placed external to the depolarizing cells of the myocardium

A

The interference theory

45
Q

Some tissue repolarize in the opposite direction of the depolarization,what is the most notable tissue that this occurs in

A

Ventricular myocardium

46
Q

What are leaky cells?And where are the leaky cells?

A

Leaky cells are cells that do not maintain polarity and are also known as the pacemakers. They are located in the SA node and the AV node

47
Q

List the order of depolarization as it hits each of the myocardial cells

A

SA nodeAtrial muscleAV nodeCommon bundleBundle branchesPurkinje fiberVentricular muscle

48
Q

What is known as the hoot owl theory

A

The dipole theory

49
Q

What is the ECG measured in

A

mV

50
Q

True or false: the farther away from the heart you go, the greater the voltage amplitude you will get

A

False

51
Q

True or false electrical activity spreads across the heart via a defined anatomical pathway

A

True

52
Q

What is another name for potential lines when the potential is the same everywhere on that line

A

Equipotential lines

53
Q

True or false: current and potential lines exist in the limbs and extremities

A

False they do not exist in the limbs they only move in limbs through cable conduction

54
Q

What are the surface potentials at any given moment in time in relation to the front and back

A

There is no symmetry from front to back in in surface potential

55
Q

As far as myocardial electrical activity is concerned, vector length is equal to what

A

Length is the magnitude of the gradientThe higher the magnitude the longer the vectorThe Lower the magnitude the shorter the vector

56
Q

Vector direction indicates what

A

The anatomical pathway of the electrical activity

Instrument Exam 2 (4 decks)

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