EKG Chapter 1-5 exam questions

The Apex of the Heart is formed ny the

Tip of the left Ventricle

the left atrium receives blood from the

Pulmonary Vein

The Heart is divied into ____ chambers but functions as a ___ sided pump

Four;two

Blood Pressure is determined by _____ multiplied by ____

cardiac output; peripheral vascular resistance

The right atrium recives venous blood from the head, neck, and thorax via the ___, the remainder of the body from the ____and from the heart via the _______.

superior vena cava; inferior vena cava; coronary sinus

the intrinsic rate of the atrioventricular (AV) node is

40-60 bpm

______ is the ability of the cardiac pacemaker cells to spontaneously initiate any electrical impulse without being stimulated from another soruce, such as a nerve

automaticity

The normal pacemaker of the heart is the node, which is found in the _____ atrium and has an intrinsic firing rate of _____ beats/min

sinoatrial (SA); right; 60-100

On the ECG, what is the first negative deflection seen after the p wave

Q wave

on the ECG the T wave represents

Ventricular Repolarization

The rate of Sinus Tachycardia is _____ beats/min

faster than 100

An ECG rhythm strip shows a ventricular rate of 46 beats/min, a regular rhythm, a PR interval of 0.14 seconds, a QRS duration of 0.06 seconds and one upright P wave before each QRS. This rhythm is __________.

sinus bradycardia

PR interval of 0.16 seconds, a QRS duration of 0.08 seconds, and one upright P wave before every QRS. This rhythm is sinus ______

Tachycardia

The rate of a Sinus rhythm is ____ beats/min

60-100

the rate of sinus bradycardia is ___ beats/min

slower than 60

How are frequent PACs usually managed?

correcting the underlying cause

identify the following rhythm (lead II)

sinus rhythm with a PAC

Upon conversion of atrial fibrillation to sinus rhythm, the patient should be observed for signs of a possible stroke

true

Identify the following rhythm

Atrial Flutter

P waves in this sinus rhythm strip ____

vary in size and shape

A beat originating from the AV junction that appears later than the next expected sinus beat is called a ____

junctional escape beatPr

common causes of acute junctional dysrhythmias include acute coronary syndromes and ________.

digitalis toxicity

Which oif the following medications increases heart rate by accelerating the SA node and blocking the vagus nerve?

Atropine

Identify the following rhythm (lead II)

Accelerated Junctional Rhythm

Identify the following rhythm (lead II)

Sinus tachycardia with premature junctional complexes

Whta is the function of the right Atrium?

Receives Blood

Which is a branch of the left coronary artery?

Circumflex

A conduction problem above the level of the bundle branches lagerly affect the P wave and PR interval

True

The period of time during the cardiac cyclewhen the cells cannot respomnde to a stimulus, no matter how strong, is the relative refractory period

False: its the ACTIVE relative refractory period

Indivduals with Preexcitation syndrome are predisposed to tachydysrhythmias

True

IF the wave of depolarization (electrical impulse) moves towards the3 positive electrode, the waveform recorded on ECG graph paper will be upright (Positive deflection)

True

The thick, muscular middle layer of the heart wall that contains the atrial and ventricular muscle fibers necessary for contraction is the ____.

Myocardium

Blood flows from the right atrium through the _____ valve into the right ventricle.

Tricuspid

Which of the following are semilunar valves?

Pulmonic and Aortic

Multifocal atrial Tachycardia is another name for atrial fibrillation

False

A junctional escape rhythm occurs because of

Slowing of the rate of the heart’s primary pacemaker

The usual rate of nonparoxysmal junctional tachycardia is ______ beats/min.

120-140

The atrioventricular (AV) junction consists of the

AV node and the non branching porton of the Bundle of His

If seen the P wave of a rhythm originating in the AV junction will appear _____ in Lead II

inverted

WHich of the following may cause a sinus bradycardia?

Hypothermia

Which of the following corrects describes multifocal atrial tachycardia?

Atrial and ventricular rhythms are irregular

The most common type of supraventriculae tachycardia (SV) is ___/

AV nodal reentrant tachycardia (AVNRT)

Which of the following are possible causes of sinus tachycardia?

Fever, pain, anxiety

Leads I, aVL, V5, and V6 veiw the ______ surface of the left ventricle

Lateral

The absolute refractory period begins with the onset of the ____and terminates ____.

QRS complex; at approximately the apex T wave

The QT interval is measured from the beginning of the ____

ORS complex to the end of the T wave

In an adult, the normal duration of the QRS complex is _____.

0.10 seconds or less

The intrinsic rate of the Purkinje fibers is ____ beats/min

20-40

The intrinsic rate of the SA node is ___ beats/min.

60-100

On the ECG, the time necessary for the speed of an electrial impulse through the AV node, bundle of His, right an left bundle branches, and the Purkinje fibers is reflected by the

PR segment