cardiac diagnostic testing victor politi, m.d, facp medical director, svcmc, school of allied health...

Cardiac Diagnostic Testing

Victor Politi, M.D, FACP

Medical Director, SVCMC, School of Allied Health Professions, Physician Assistant Program

Electrocardiographic Tests

• Electrocardiographic tests are noninvasives tests which uses the electrocardiogram to evaluate the electrical activity generated by the heart at rest and with activity

• Ambulatory Monitors

• EKG/ECG

• Exercise Stress Test

• Head Upright Tilt Test

• Metabolic Exercise Stress Test

Electrocardiographic Tests

Ambulatory Monitors

• Ambulatory monitors are small, portable electrocardiograph machines that are able to record the heart’s rhythm. Each type of monitor has unique features related to length of recording time and ability to send the recordings over the phone

Ambulatory Monitors

• assess heart rhythm over time

• correlate symptoms with heart rhythm

• diagnose abnormal heart rhythms: – what kind they are, how long they last, and

what may cause them guide treatment for abnormal heart rhythms

Types of Ambulatory Monitors

• Holter

• Loop Recorder

• CardioNet (mobile cardiac outpatient telemetry)

• Transtelephonic transmitter

Holter Monitor (also called Ambulatory ECG)

• A Holter monitor is a portable ECG recorder that is worn during normal daily activities, including sleeping. It can be worn up to 24 hours.

Holter Monitor

• Electrodes are placed on the skin of the chest. Wires are attached from the electrodes to a box about the size of a portable tape player and worn on a belt or shoulder strap. The electrical impulses are continuously recorded and stored in the Holter Monitor

Holter Monitor

• The patient is asked to keep a diary of activities and symptoms, such as fluttering feelings in the chest (palpitations), rapid heartbeats, and any episodes of dizziness or faintness.

Loop Recorder (also called an Event Recorder)

• This device, similar to a Holter monitor, is worn during normal daily activities including sleeping; however, it is worn for a longer period of time. It can be removed during showers and baths. It is used for arrhythmias that occur less frequently.

Loop Recorder

• When the patient feels symptoms, they depress a button and the recorder is activated. The monitor records the event for the 60 seconds prior to pushing the button and up to 40 seconds after the arrhythmia is over. The loop recorder can store up to three events.

Loop Recorder

• The rhythm can be sent immediately or saved and transmitted later, over the phone line. The technician will give the recordings to the doctor for review. If the reading indicates an emergency, the technician will instruct the patient to go to the emergency room

Technician instructing on Loop Recorder

CardioNet(Mobile Cardiac Outpatient Telemetry)

• CardioNet mobile telemetry allows continuous heartbeat monitoring as the patient goes about daily activities. Most people are on the CardioNet service from 7 to 14 days.


• This device consists of a small sensor attached to three electrode pads, worn on a belt clip. The sensor sends each heartbeat to a handheld monitor that can be tucked into a pocket or purse.


• When the monitor detects a heart rhythm problem — whether the patient feels it or not — it automatically transmits your ECG to the CardioNet monitoring center. A cardiac technician analyzes each transmission, responds appropriately to each event and transmit diagnostic reports to the doctor.

Patient wearing CardioNet system

Transtelephonic Transmitter

• Transtelephonic transmitters are not worn continuously.

• They are used only during the phone-monitoring period. In the past, this type of transmitter was used for monitoring pacemaker function.

• However, now it is used for patients with arrhythmias to monitor certain events indicated by their doctor.

Transtelephonic Transmitter

• The electrode may be a finger electrode, wrist bracelet or chest plate. The patient dials the center and places the telephone into a transmitter. After the transmission is completed, the nurse or technician will ask questions about the patient’s symptoms and current medications.

Patient testing transtelephonic transmitter

Electrocardiogram (ECG or EKG)

• The ECG is a device used to record on graph paper the electrical activity of the heart. The picture is drawn by a computer from information supplied by the electrodes

Electrocardiogram (ECG or EKG)

• assess your heart rhythm

• diagnose poor blood flow to the heart muscle (ischemia)

• diagnose a heart attack diagnose abnormalities of your heart, such as: heart chamber enlargement abnormal electrical conduction

Exercise Stress Test (stress test, exercise electrocardiogram, treadmill test, graded exercise test, stress ECG)

• A test used to provide information about how the heart responds to stress.

• It usually involves walking on a treadmill or pedaling a stationary bike at increasing levels of difficulty, while the electrocardiogram, heart rate and blood pressure are monitored.

• Used to determine if there is adequate blood flow to your heart during increasing levels of activity

• evaluate the effectiveness of cardiac treatment plan

• determine the likelihood of having coronary artery disease and the need for future testing

Exercise Stress Test (stress test, exercise electrocardiogram, treadmill test, graded exercise test, stress ECG)

EST

• an electrocardiograph (ECG) monitor that charts the heart’s electrical activity during the test.

• Blood pressure and ECG recording will be taken before, during and after exercise.

EST

• The patient begins to exercise by walking on a treadmill or pedaling a stationary cycle. The degree of difficulty is gradually increased.

EST

• It is normal for the heart rate, blood pressure, breathing rate and perspiration to increase during the test.

• The lab personnel will watch for any symptoms or changes on the ECG monitor that suggest the test should be stopped.

EST

• the appointment lasts about 60 minutes, the actual exercise time is usually between 7 and 12 minutes.

• A test used to measure the performance of the heart and lungs while they are under physical stress. The test involves walking on a treadmill or pedaling a stationary bike at increasing levels of difficulty, while being closely monitored.

Metabolic Exercise Stress Test (also called metabolic stress test)


determine how fit the heart and lungs are

determine if symptoms of shortness of breath or chronic fatigue are due to a medical problem (such as heart or lung disease) or due to poor fitness

measure the heart’s ability to do work (functional capacity)

determine if certain surgical treatments are appropriate

evaluate the effectiveness the cardiac treatment plan

help develop a safe and effective exercise program

Laboratory testing

• Laboratory tests include a number of blood tests used to diagnose and monitor treatment for heart disease.

Laboratory Testing

• CBC

• Lipids

• electrolytes

• BNP (B-type Natriuretic peptide)

• Enzymes and Proteins

Laboratory FindingsTroponin I

• Earliest increase - 4-6 hours

• Peak hours 10-24

• Duration of increase 4-7 days

• Specificity 95%

• Sensitivity at peak >98%

Laboratory FindingsCK Total

• Earliest increase 4-8 hours

• Peak hours 24-36 hours

• Duration of Increase 36-48 hours

• Specificity 57-88%

• Sensitivity at peak 93-100%

Laboratory FindingsCK-MB

• Earliest increase 3-4 hours

• Peak hours 15-24

• Duration of Increase 24-36 hours

• Specificity 93-100%

• Sensitivity at peak 94-100%

Nuclear Imaging

• Nuclear imaging is a method of producing images by detecting radiation from different parts of the body after the administration of a radioactive tracer material.

Nuclear Imaging

• Radioactive tracers are not dyes. They have no side effects.

• The amount of radiation a patient receives in a typical nuclear imaging scan is very low, similar to the exposure received in a routine chest x-ray.

• In most cases the tracers are injected into a vein. In some cases they may be given by mouth.

Nuclear Imaging

• Multigated Acquisition Scan (MUGA)

• Positron Emission Tomography (PET)

• Sestamibi Exercise Stress Test

• Thallium Exercise Stress Test

Multigated Acquisition Scan (MUGA scan, nuclear ventriculogram, radionuclide

scan)

• A nuclear scan that evaluates the pumping function of the ventricles.

• An ECG, IV started.

• A resting ECG & blood pressure recorded.


scan)

• A small amount of blood is withdrawn and mixed with a radioactive tracer.

• The radioactive tracer binds to the red blood cells, the mixture is re-injected into the IV.

• The tracer stays in the bloodstream for several hours and does not enter tissue cells.


scan)

A MUGA scan analyzes the amount of radio-labeled red blood cells pumped out of the heart with each heartbeat.

This test calculates the amount of blood pumped out of the heart with each heartbeat, called the ejection fraction.

The MUGA scan takes about one to two hours to perform.

Positron Emission Tomography (PET or cardiac viability study)

• An imaging procedure that uses radioactive tracers to create three-dimensional pictures of the tissues inside of the body and that can monitor metabolic processes.

PET

PET is used to:

determine if there is adequate blood flow to the heart

assess the amount of damage to the heart after a heart attack

evaluate the effectiveness of your treatment plan

• PET is used for patients who are unable to exercise on a treadmill or stationary cycle.

PET

• An ECG and IV are started

• A resting ECG, and BP reading recorded

• A small amount of rubidium injected into the IV. Rubidium is a radioactive tracer that allows the physician to view the blood flow in the heart at rest. It is not a dye.

PET

• dipyridamole is injected into the IV for about four minutes. The medication causes the heart to react as if the patient were exercising

PET

• After all the medication has entered the bloodstream, a small amount of rubidium will again be injected into the IV.

• The rubidium allows the physician to view the blood flow to the heart muscle while it is in stress

PET

• The PET takes about three to four hours. The first part of the test will take about one hour. The second part will take about two hours, although the usual exercise time is between 7 and 12 minutes.

• A diagnostic study, that uses a small amount of radioactive tracer, injected into the body,and a special camera, that detects the radiation released by the substance to produce a computer image of the heart.

• Combined with exercise, the study can help determine if there is adequate blood flow to the heart at rest, as compared with activity.

Sestamibi Exercise Stress Test (sestamibi stress test, stress perfusion scan, stress sestamibi)


Used to:

determine if there is adequate blood flow to your heart during increasing levels of activity

evaluate the effectiveness of your cardiac treatment plan

determine the likelihood of having coronary artery disease and the need for future testing


• a small amount of thallium is injected into a vein.

• Thallium is a radioactive tracer that allows the physician to assess heart function. Thallium is not a dye.

• The patient lies under a camera with their arms over their head for about 15 to 20 minutes.

• The camera records images that show the blood flow to each area of the heart muscle at rest.

• Next the patient goes to the Stress Lab. A resting ECG, and BP rate recorded. An IV will be started.

• The patient will begin to exercise by walking on a treadmill or pedaling a stationary cycle. The degree of difficulty will gradually increase.


• One minute before stopping exercise, a small amount of sestamibi (a different type of radioactive tracer) will be injected in the IV. Once the sestamibi is administered, the IV will be removed. The patient may be asked to drink milk, which enhances the quality of the images.


• About 30 minutes after exercise is complete, the patient returns to nuclear medicine - images are again taken (for about 20 minutes). The camera will now record images that show how well blood flows through the coronary arteries to each area of the heart muscle during exercise


• The appointment lasts about three to four hours, the actual exercise time is usually between 7 and 12 minutes.


Thallium Exercise Stress Test (stress thallium test, perfusion scan)

• A type of nuclear scanning technique that uses the radioactive substance thallium.

• A thallium stress test combines nuclear scanning with exercise on a treadmill or stationary bicycle to assess heart function and determine if there is adequate blood flow to the myocardium.

• A thallium stress test is used to-– determine if there is adequate blood flow to

the heart during increasing levels of activity

– evaluate the effectiveness of a cardiac treatment plan

– determine the likelihood of having coronary artery disease and the need for future testing


• BP and ECG recording will be taken before, during and after exercise.

• The patient will begin to exercise by walking on a treadmill or pedaling a stationary cycle.

• The degree of difficulty will gradually increase.


• At the maximum level of exercise, a small amount of thallium is injected into a vein.

• The thallium travels through the bloodstream, reaching the coronary arteries and then the cells of the heart muscle.

• A camera detects the distribution of thallium in the myocardium.


• Because the thallium works as a tracer to indicate the areas of the myocardium that blood is reaching, regions that show less thallium have a loss of perfusion, or blood flow

• the appointment lasts about 60 minutes, the actual exercise time is usually between 7 and 12 minutes.


Ultrasound

• Ultrasound tests are noninvasive tests which use ultrasound, or high frequency sound wave, to create graphic images of the heart's structures, pumping action, and direction of blood flow.

Ultrasound Studies

• Echocardiogram

• Dobutamine Stress Echo

• Transesophageal Echocardiogram (TEE)

• Exercise Stress Echo

Echocardiogram

• An echocardiogram (often called "echo") is a graphic outline of the heart's movement.

Echocardiogram

• During an echocardiogram test, ultrasound ( high-frequency sound waves) that come from a hand-held wand placed on the chest, is used to provide pictures of the heart's valves and chambers and help the sonographer evaluate the pumping action of the heart.

Echocardiogram

• Echo is often combined with Doppler ultrasound and color Doppler to evaluate blood flow across the heart’s valves.

Dobutamine Stress Echocardiogram (dobutamine echo, pharmacological echocardiogram)

• An echocardiogram is used to – assess the heart’s function

– determine the presence of disease of the heart muscle, valves and pericardium, heart tumors, and congenital heart disease

– evaluate the effectiveness of medical or surgical treatments

– follow the progress of valve disease


• The dobutamine stress echo test involves infusing a medication through an intravenous (IV) line, called dobutamine.

• The dobutamine stimulates the heart and makes it "think" it is exercising.

• The test is used to evaluate the heart and valve function when the patient is unable to exercise on a treadmill or stationary cycle


A dobutamine stress echo is used to:

Determine how well the heart tolerates stress or exertion

Evaluate the function of your heart and valves

Evaluate the effectiveness of your cardiac treatment plan

Determine the likelihood of having coronary artery disease and the need for further testing

• A resting ECG and BP are recorded

• A resting sonogram is done

• The dobutamine is administered via IV as the sonogram continues

• The dobutamine causes the heart to react as it would under exercise

• The dobutamine stress echo takes about 60 minutes. The actual infusion time is usually 15 minutes.


TEE- Transesophageal echocardiogram

• During the transesophageal echocardiogram (TEE) test, an ultrasound transducer (which produces high frequency sound waves) provides pictures of the heart's valves and chambers and helps evaluate the pumping action of the heart.

• The ultrasound transducer is positioned on an endoscope. The endoscope is placed into the mouth and passed into the esophagus to provide a close look at the heart's valves and chambers without interference from the ribs or lungs.


• TEE is often combined with Doppler ultrasound and color Doppler to evaluate blood flow across the heart’s valves. TEE is often used when the results from standard echo studies were not sufficient


• TEE is used to:– Assess the overall function of the heart's

chambers and valves – Determine the presence of many types of heart

disease (I.e. valvular/myocardial heart disease, pericardial disease, cardiac masses and congenital heart disease)

– Evaluate the effectiveness of medical or surgical treatments Evaluate abnormalities of the left atrium


Exercise Stress Echo

• The exercise stress echo test involves exercising on a treadmill or stationary cycle.

• The test is used to evaluate heart and valve function at rest and with exertion

• An exercise stress echo is used to - Determine how well the heart tolerates activity

Evaluate the function of the heart and valves

Determine the likelihood of coronary artery disease

Evaluate the effectiveness of a cardiac treatment plan


• A resting ECG, resting heart rate and BP will be recorded before exercise

• A resting echo will also be performed.

• The patient will exercise either on a treadmill or stationary bicycle - gradually increasing the rate of exercise


• if the patient was exercising on a bike, the echo test may be performed while the patient is still pedaling. Another echocardiogram after exercising may also be performed

• If exercise was on a treadmill, the patient will return to the table to lie down for another echo.


• The appointment takes about 60 minutes. The actual exercise time is usually between 7 and 12 minutes.


Radiographic Tests

• Radiographic tests are noninvasive tests which use x-ray machines or specialized equipment with computer technology to create pictures of the internal structures of the chest

Radiographic Studies

• Calcium-Score Screening

• Cardiac CT

• Chest x-ray

• MRI

Radiographic Test- Calcium Score Screening Heart Scan

• A test used to detect calcium deposits found in atherosclerotic plaque in the coronary arteries.

• CT methods, such as this one, are the most sensitive approaches to detecting coronary calcification from atherosclerosis, before symptoms develop.

• More coronary calcium means more coronary atherosclerosis, suggesting a greater likelihood of significant narrowing somewhere in the coronary system and a higher risk of future cardiovascular events


• Those at increased risk include individuals with the following traits:

family or personal history of coronary artery disease

male over 45 years of age, female over 55 years of age

past or present smoker

history of high cholesterol, diabetes or high blood pressure

overweight

inactive lifestyle


• there are certain forms of coronary disease -- such as "soft plaque" atherosclerosis – that escape detection during this CT scan, it is important to remember that this test is not absolute in predicting risk for a life-threatening event, such as a heart attack.


• CT scan captures multiple images, synchronized with the heartbeat. A computer program, guided by the cardiovascular radiologist, then analyzes the images for presence of calcification within the coronary arteries


Absence of calcium is considered a "negative" exam. It does not exclude the presence of "soft" noncalcified plaque.

If calcium is present, the computer will create a calcium score that estimates the extent of coronary artery disease.


Cardiac Computed Tomography (CT, cardiac CT or cardiac CAT scan)

• A traditional CT scan is an x-ray procedure that combines many x-ray images with the aid of a computer to generate cross-sectional views of the body.

• Cardiac CT uses the advanced CT technology with intravenous (IV) contrast (dye) to visualize your cardiac anatomy, coronary circulation and great vessels.

• the cardiac CT is used to evaluate: the heart muscle

the coronary arteries

the pulmonary veins

the thoracic aorta

the sac around the heart (pericardium)

Cardiac Computed Tomography (CT, cardiac CT or cardiac CAT scan)

Chest X-Ray (CXR, chest film)

• an image of the structures of the chest (heart, lungs and bones) on film

• used to: look at the structures of the chest (bones, heart,

lungs)

evaluate placement of devices (pacemakers, defibrillators) or tubes placed during hospitalization for treatment and monitoring (catheters, chest tubes)

diagnose lung and cardiac diseases

Magnetic Resonance Imaging (MRI)

• A test that produces high-quality still and moving pictures of the heart and great vessels.

• MRI uses large magnets and radio-frequency waves to produce pictures of the body’s internal structures; no x-ray exposure is involved.

MRI

• MRI acquires information about the heart as it is beating; creating moving images of the heart throughout its pumping cycle.

MRI

• MRI to evaluate: The anatomy and function of the structures of the

chest: heart, lungs, great vessels and pericardium

Presence of disease: ischemic heart disease, thoracic aortic disease, pericardial disease, right ventricular abnormalities, cardiac tumors, valve disease, heart muscle disease (cardiomyopathy), pulmonary artery disease and complex congenital heart disease

Invasive Tests

• Invasive tests involve inserting catheters into the blood vessels of the heart in order to get a closer look at the coronary arteries or to stimulate and test the electrical system of the heart.

Invasive Tests

• Carotid Angiography

• Cardiac Catheterization

• Electrophysiology Study

• Intravascular Ultrasound

• Myocardial Biopsy

Carotid Angiography

• An invasive imaging procedure that involves inserting a catheter into a blood vessel in the arm or leg, and guiding it to the carotid arteries with the aid of a special x-ray machine.

• Contrast dye is injected through the catheter so that x-ray movies of the carotid arteries are taken.

Carotid Angiography

Carotid angiography

• carotid angiography is used to: evaluate or confirm the presence of narrowing or

blockage in carotid arteries

determine risk for future stroke

determine the need for further treatment (angioplasty or surgery)

Carotid angiography

• A plastic introducer sheath (a short, hollow tube through which the catheter is placed) is inserted a blood vessel in the arm or groin. A catheter is inserted through the sheath and threaded to the arteries of the neck (right and left carotid artery).

• When the catheter is in place, contrast material will be injected. The contrast material outlines the vessels.

Cardiac Catheterization

• An invasive imaging procedure that involves inserting a catheter into a blood vessel in the arm or leg, and guiding it to the heart with the aid of a special x-ray machine.

• Contrast dye is injected through the catheter so that the valves, coronary arteries and heart chambers are can be visualized.

• cardiac cath is used to: evaluate or confirm the presence of heart disease

(such as coronary artery disease, valve disease or disease of the aorta)

evaluate heart muscle function

determine the need for further treatment (angioplasty or bypass surgery)

Cardiac Catheterization

Intravascular Ultrasound (IVUS)

• An invasive procedure, performed along with cardiac catheterization; a miniature sound probe (transducer) on the tip of a coronary catheter is threaded through the coronary arteries and, using high-frequency sound waves, produces detailed images of the interior walls of the arteries.

• IVUS is used to: assess the inside of the vessel walls, making it

possible to evaluate the size of fatty matter; how it is distributed, and in some cases, what it is made of

determine the need for further treatment (angioplasty or bypass surgery)

determine the need for aggressive management of risk factors prior to onset of symptoms and advanced disease

determine the predictors of transplant coronary artery disease


• A plastic introducer sheath is inserted in the groin. A catheter will be inserted through the sheath and threaded to the arteries of the heart. Through the catheter, a wire with an ultrasound tip will be passed into the coronary arteries.


• Once the catheter is within the coronary artery, a series of cross-sectional pictures of the artery are produced


Myocardial Biopsy

• An invasive procedure that involves using a bioptome (a small catheter with a grasping device on the end) to obtain a small piece of heart muscle tissue that is sent to a laboratory for analysis.

Myocardial Biopsy

• myocardial biopsy is used to: evaluate or confirm the presence of rejection after

heart transplant

diagnose myocarditis (inflammation of the heart muscle)

• An EP Study is a recording of the electrical activity of the heart. This test is used to help determine the cause of rhythm disturbances and the best treatment.

• During the test, arrhythmia can be reproduced and various medications given to see which one controls it best.

Electrophysiology Study (EP)

• the EP study is used to: determine the cause of an abnormal heart rhythm

locate the site of origin of an abnormal heart rhythm

decide the best treatment for an abnormal heart rhythm



• Several catheters are inserted into the vein in the groin

• Guided by the fluoroscopy machine, the catheters are threaded to the heart.

• The catheters sense the electrical activity in the heart and are used to evaluate the heart’s conduction system.

• A pacemaker is used to give the heart electrical impulses through one of the catheters to increase heart rate.

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cardiac diagnostic testing victor politi, m.d, facp medical director, svcmc, school of allied health...

Documents

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