3/31/2015

What Is Cardiac Testing?

Chad Morsch B.S., ACSM CEP

• Cardiac stress tests compare the coronary A Cardiac Stress Test is a test used to circulation while the patient is at rest with the measure the 's ability to circulation observed during maximum physical exertion, showing any abnormal flow to respond to external stress in a the heart's muscle tissue controlled clinical environment. • This test can be used to diagnose ischemic heart disease, and for patient prognosis after a heart attack or procedure (CABG, STENT, etc.)

MODALITIES MODALITIES • Treadmill, Bicycle, or Arm Ergometer • Treadmill, Bicycle, or Arm Ergometer • The level of mechanical stress is progressively increased by adjusting the difficulty (incline, speed, or tension)

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MODALITIES MODALITIES • Treadmill, Bicycle, or Arm Ergometer • Treadmill, Bicycle, or Arm Ergometer • The level of mechanical stress is progressively • The level of mechanical stress is progressively increased by adjusting the difficulty (incline, increased by adjusting the difficulty (incline, speed, or tension) speed, or tension)

• Intravenous Pharmaceutical • Intravenous Pharmaceutical • , , Persantine, or administered to patient through an IV

MODALITIES ABSOLUTE CONTRAINDICATIONS • Treadmill, Bicycle, or Arm Ergometer Stress Testing • The level of mechanical stress is progressively increased by adjusting the difficulty (incline, 1) Recent significant change in ECG (i.e. MI, , etc) speed, or tension) 2) Unstable 3) Uncontrolled cardiac causing symptoms • Intravenous Pharmaceutical 4) Severe • Regadenoson, Adenosine, Persantine, or 5) Uncontrolled Dobutamine administered to patient through an 6) Acute pulmonary embolus IV 7) Acute myocarditis or 8) Suspected/known dissecting aneurysm  , , and EKG are analyzed for 9) Acute systemic infection abnormalities and improper response to exercise or simulated exercise

ABSOLUTE CONTRAINDICATIONS ABSOLUTE CONTRAINDICATIONS Regadenoson Adenosine and Persantine () 1) Any condition that would exacerbate bronchospasms (acute , wheezing or congestion) 1) Any condition that would exacerbate bronchospasms 2) Use of dipyridamole or dipyridamole‐containing (acute asthma, wheezing or congestion) medications (e.g., Aggrenox) in the last 48 hours 2) HHiypotension, SSliystolic BP <90 mm Hg 3) Use of aminophylline in the last 24 hours 3) Use of dipyridamole or dipyridamole‐containing 4) Use of products containing methylxanthines as well as medications (e.g., Aggrenox) in the last 48 hours drugs containing theophylline in the last 12 hours 4) Ingestion of in last 12 hours 5) Ingestion of caffeine in last 12 hours 5) Advanced heart block 6) Hypotension, Systolic BP <90 mm Hg 7) Known hypersensitivity to adenosine or dipyridamole 8) Advanced heart block

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PATIENT ANALYSIS INDICATIONS FOR STOPPING A • How does the patient ambulate STRESS TEST • Has the patient done this test before Absolute 1) Drop in systolic BP of >10 mm Hg from baseline • Review past medical history pressure when accompanied by ischemia 2) Moderate to severe angina • Medications 3) Increasing nervous system symptoms (dizziness) 4) Signs of poor ( or pallor) • Listen to heart and lung sounds 5) Technical difficulties monitoring BP or EKG 6) Subjects desire to stop • Check blood pressure and heart rate 7) Sustained 8) ST elevation > 1mm in leads without diagnostic Q‐ • Analyze the EKG waves (other than V1 or aVR)

Prepping The Patient

Prepping The Patient Prepping The Patient  Obtain IV access  Obtain IV access

 You must have access to the bare chest • Lifting, unbuttoning or removing of shirt • Removal of a bra

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Prepping The Patient Prepping The Patient  Obtain IV access  Obtain IV access

 You must have access to the bare chest  You must have access to the bare chest • Lifting, unbuttoning or removing of shirt • Lifting, unbuttoning or removing of shirt • Removal of a bra • Removal of a bra

 A Clean site is optimal!!  A Clean site is optimal!! • Shaving of chest hair • Scratching of skin with sandpaper • Wiping skin with alcohol

Precordial Leads V1 –4th intercostal space immediately to the right of the sternum

V2 –4th intercostal space immediately to the left of the 12 Lead EKG Electrode Placement sternum

V3 – Directly between V2 and V4

V4 –5th intercostal space ‐ midclavicular line Limb Leads Right Arm V5 –5th intercostal space Left Arm midway between V4 and V6 Right Leg Left Leg V6 –5th intercostal space ‐ midaxillary line

Horizontal Plane

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IT’S NOT JUST A BUNCH OF SQUIGGLY LINES…THERE ARE WAVES!

P Wave –Atrial Depolarization QRS Complex –Ventricular Depolarization

T Wave –Ventricular Repolarization U Wave –Late Repolarization

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PR Interval ‐ .12 to .20 seconds QRS Interval ‐ .04 to .11 seconds

CAN YOU DEFINE NORMAL??

QT Interval –The time from the beginning of ventricular depolarization to the end of repolarization

NORMAL SINUS RHYTHM

Heart Rate ‐ between 60‐100 bpm

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BRADYCARDIA TACHYCARDIA

Heart Rate ‐ less than 60 bpm Heart Rate ‐ greater than 100 bpm

Premature Ventricular Contraction Premature Ventricular Contraction (PVC) (PVC)

• Most common of the ventricular arrhythmias • QRS duration must be at least 0.12 seconds • Isolated PVCs are common in normal

BIGEMINY TRIGEMINY

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VENTRICULAR TACHYCARDIA VENTRICULAR TACHYCARDIA

• A run of three or more PVCs • Usually has a rate between 120 –200 bpm

Premature Atrial Contraction Premature Atrial Contraction (PAC) (PAC)

• PACs are common phenomena • A P wave is visible but differs from sinus P waves • Conduct normally to ventricles, normal QRS

PAROXYSMAL SUPRAVENTRICULAR PSVT TACHYCARDIA (PSVT)

• Has a regular rhythm with a HR of 150‐250 bpm • Narrow QRS • Onset is sudden and termination is just as abrupt • Valsalva techniques can break the • Advanced treatment with Adenosine or

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FIRST DEGREE AV BLOCK FIRST DEGREE AV BLOCK

• Caused by a prolonged delay in conduction at the AV node • PR interval of 0.2 seconds • Every QRS complex is preceded by a P wave

SECOND DEGREE AV BLOCK SECOND DEGREE AV BLOCK (MOBITZ TYPE I) (MOBITZ TYPE I)

• Also known as a Wenckebach • Usually due to a block within the AV node • Progressive lengthening of each successive PR interval until one P wave fails to conduct through the AV node and is therefore not followed by a QRS complex • Sequence then repeats itself

SECOND DEGREE AV BLOCK SECOND DEGREE AV BLOCK (MOBITZ TYPE II) (MOBITZ TYPE II)

• Usually due to a block below the AV node in the HIS bundle • Not all atrial impulses are transmitted to the ventricles • There is a presence of a dropped beat without progressive lengthening of the PR interval • Ratio of conducted beats to non‐conducted (P waves to QRS complex) beats can vary

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THIRD DEGREE AV BLOCK THIRD DEGREE AV BLOCK (COMPLETE HEART BLOCK) (COMPLETE HEART BLOCK)

• Complete AV dissociation • P waves and QRS complexes appear at regular intervals but have nothing to do with one another • Atria contract about 60‐100 bpm • Ventricles contract about 30‐45 bpm • Ventricular complexes will appear wide and bizarre like PVCs

ATRIAL FIBRILLATION

• Irregular rhythm • QRS will generally appear normal • No true P waves are distinguishable • contracting at over 300 bpm • Baseline appears to be undulating slightly

ASYSTOLE SO WHY DO I NEED TO KNOW ALL THIS?

HOW DOES THIS PERTAIN TO MY JOB?

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• Gating of myocardial perfusion patients • Gating of myocardial perfusion patients • Ejection Fraction

How it Works Ejection Fraction

The amount of blood in the left and right ECG ventricles pumped out with each heartbeat Gate Camera/ Computer

Frame 1 Frame 3 Frame 28

QUANTIFICATION

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• Gating of myocardial perfusion patients • Gating of myocardial perfusion patients • Ejection Fraction • Ejection Fraction

• Emergencies • Emergencies

•Second set of eyes

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QUESTIONS?

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