Big Chapter 2 Flashcards
Muscular Organ located in the center of the thoracic cavity behind the sternum
The Heart
The hearts 4 chambers
Two Atria and Two Ventricles
Dividing Wall Between The Atria
Interatrial Septum
Dividing wall separating the ventricles
Interventricular Septum
Atrioventricular Valves
Triscupid and Biscupid
Separates the Right Atrium from the Right Ventricle
Triscupid Valve
Seperates the left atrium from the left ventricle
Biscupid (mitral) Valve
Lies between the right ventricle and pulmonary arteries
Pulmonary Valve
Lies between the left ventricle and the aorta
Aortic Valve
Aortic and Pulmonary Valves are called
Semilunar Valves
Prevents blood from flowing backward inside the heart
Synchronized Valve Closure
One of Two Main Arteries that carry Oxygenated Blood to the Right Atrium Right Ventricle and Part of the Left Atrium
RCA
Carry oxygenated blood to the Myocardium
LMCA
Supplies oxygenated blood to the posterolateral aspect of the left ventricle
LCx
Supplies the anterior wall of the left ventricle
LAD
Cluster of cells located in the right atrial wall and functions as the natural pacemaker of the heart
SA Node
Can manifest as extreme sinus bradycardia on the EKG tracing
SA Node Artery
Part of the electrical conduction system that connects the atria to the ventricles
AV Node
A back up pacemaker can fire up in approximately
40 to 60 minutes
High degree heartblock on a EKG
AV Node Artery
Carries the electric impulse from the bundle of His to the Purkinje fibers
Right Bundle Branch
Carries the electrical impulse from the bundle of His to the Purkinje Fibers of the left ventricle causing depolarization
Left Bundle Branch
EKG paper provides measurements for both
Voltage and Time
EKG paper small boxes measures
1 mm tall by 1mm wide
Standard paper speed of a EKG
25mm
Leads that have only one pole
Unipolar Leads
Single positive electrode referenced against the combination of the other limb leads
Augmented Leads
Leads that have two poles one positive one negative
Bipolar Leads
Records Impulses between the left and right arms
Lead 1
Records Impulses between the right arm and left leg
Lead 2
Records impulses between the left arm and left leg
Lead 3
The left leg and right arm assist with the left arm tracing
AVL
The left arm and left leg assist with the right arm tracing
AVR
The right and left arms assist with the left leg tracing
AVF
Fourth Intercostal Space right of the Sternum
V1
Fourth ICS left of sternum, directly across from V1
V2
Midway between v2 and v4
V3
Fifth ICS, midclavicular line
V4
Fifth ICS,midway between V4 and V6, at the anterior axillary line
V5
Fifth ICS at the mid axillary line
V6
12 lead EKG Colors
White - Right Arm
Black- Left Arm
Red- Left Leg
Green- Right Leg
12 Lead EKG Precordial Lead Colors
V1: Red V2:Yellow V3:Green V4:Blue V5:Orange V6:Purple
Holter Monitor Lead Colors
White Lead: Right chest about two inches below the clavicle
Red Lead: Left chest, lower rib-cage area
Black Lead: Left chest, opposite of white lead
Brown Lead: Right Chest, fourth rib
Green Lead: Right lower chest, over a rib
3 Lead EKG Colors
White Lead: Right Shoulder just below the clavicle
Black Lead: Left shoulder just below the clavicle
Red Lead: Below the left pectoral muscle at the apex of the heart
Stress Testing Colors
White lead: Right Clavicle/ Shoulder Area
Black Lead: Left Clavicle
Red lead: Left Lower abdominal area
Green lead: Right lower abdominal area
Telemetry Colors
White Electrode: Is placed on the right shoulder area
Black Electrode: is placed on the left shoulder
Green Electrode: is placed on the lower left abdominal area
Variety of things going wrong from both patient and non patient factors
Artifacts
Movement of the cables or leads Patient moving Loose electrodes Dry electrodes Patients labored breathing Improper skin preparation
Wandering Baseline
Some causes are controllable such as shivering
Some causes are not controllable such as active seizure
Somatic Tremor
Electronic device on or near the patient can cause electrical interference
Cellphone can cause artifacts sharp spikes
AC Interference
Broken lead wires or disconnected leads the tracing is not continuous
Interrupted Baseline
Vessels that arise from the root of the aorta
Coronary Arteries
1mm =
- 1mv
0. 04 second
5mm=
- 5mv
0. 2 seconds
Results in high degree heart block on the EKG
Atrioventricular Node Artery
Circulation formed by smaller blood vessels branching off from or near large occluded blood
Collateral Circulation
Dizziness
Light head ness
Nausea
Chest pain
8 signs of patient distress
Natural pacemaker of the heart rate
60-100
Located in the right atrial wall
3 bipolar leads and 3 augmented leads records electrical potentials in frontal plane
Limb leads
The electrocardiography grid
EKG paper
Vertical exits represent on EKG paper
Amplitude
What is the tracing on the EKG paper marked by
A stylus using heat
Left leg is positive and the left arm is negative
Lead 3
What is important about the Purkinje fibers?
They initiate myocardial contraction
Standard amplitude
10 mm
Standard calibration
10mm
Standard limb leads 1,2,3
Bipolar Leads
Place the six precordial leads v through v6 in the same locations required for the standard 12- lead ekg
Stress testing
Vary in size shape but all have basically the same parts
EKG machines
Recorder that monitors all 12 leads at once
Multichannel EKG machine
The left arm is positive and right a is negative
Lead 1
Enables the evaluation of the patients heart rate, rhythm and QRST morphology during the usual activities
Ambulatory EKG monitoring