Paramedic Cardiac Intro

You are treating a patient who has a damaged SA node that is no longer pacing the heart. You would expect the patient's heart to

Acetylcholine affects the heart by:

The ventricles of the heart are innervated mainly by:

While evaluating a 22-year-old female runner who called 9-1-1 because she fell and twisted her ankle. You apply an ECG monitor. Her heart rate is 46, P waves are normal and upright, the PR interval is 0.16 second, and the QRS complex looks normal. Skin is warm and dry. She of moaning in pain. There is a QRS complex following each P wave. The treatment plan at this time for this patient's heart rate should include:

The resting membrane potential is determined primarily by the difference between the intracellular potassium ion level and the:

Parasympathetic control of the heart is provided by the:

Depolarization takes place when:

Deep and symmetrically inverted T waves may be indicative of:

When analyzing an ECG tracing, you notice that the rhythm is highly irregular. The best method to calculate the rate is the:

The activation of myocardial tissue more than one time by the same impulse is called:

The AV junction is formed by the AV node and the:

Stroke volume depends on preload, after load and

To increase cardiac output, you can:

The valve between the right atrium and the right ventricle is the:

Which of the following is an unipolar lead?

During the action potentials:

Relaxation of the heart is referred to as:

An ECG can help to determine:

The sodium-potassium pump functions to move:

The chief pacemaker of the heart under normal conditions is the:

The most important factor in determining stroke volume is:

Which of the following may cause sinus bradycardia?

Each small square on the ECG graph paper represents________ mV

The triplicate method of determining heart rate is :

Phase I of the action potential represents the period of:

Lead I looks at the heart from what view?

The brief pause between the P wave and QRS complex represents:

The P-R interval should be no shorter than _____ seconds and no longer than ____ seconds in duration

An increase in peripheral vascular resistance:

Jugular vein distention in cardiac patients should be evaluated with the patient positioned:

An ECG can help to determine:

An ECG strip shows a regular rhythm with a QRS complex of 0.8, a rate of 145, a PR interval of 0.12, and one upright P wave before every QRS complex. You suspect that this rhythm is:

In lead III placement, the positive lead is located on the:

The best lead for monitoring dysrhythmias is:

The duration of the QRS complex should be ________ seconds

You are treating a 75-year-old woman who has a history of diabetes and atherosclerosis. Her chief complaint is persistent heartburn. You suspect:

Hypocalcemia and hypomagnesemia would MOST likely result in:

Which of the following is a bipolar lead?

Leads II and III are:

In the event of a coronary artery blockage, the muscle of the heart can receive blood from the:

Standard ECG paper is divided into 1-mm blocks and moves past the stylus of the ECG at 25 mm per second. Each small block represents:

In order to ensure proper electrolyte distribution and maintain the polarity of the cell membrane, the sodium-potassium pump

While assessing a patient you identify a carotid bruit. This leads you to believe that the patient:

The PR interval represents the time it takes an electrical impulse to

If the heart's secondary pacemaker becomes ischemic and fails to initiate an electrical impulse

The circumflex artery is a branch of the:

Which of the following cardiac pacemakers has an intrinsic rate of 40 to 60 beats per minute?

The right atrium receives blood from the systemic circulation and the:

The first upward deflection on an ECG tracing is the:

While evaluating a 22-year-old female runner who called 911 because she fell and twisted her ankle, you apply an ECG monitor. Her heart rate is 46, P waves are normal and upright, the PR interval is 0.16 second, and the QRS complex looks normal. There is a QRS complex following each P wave. The patient's ECG tracing reflects:

The part of the ECG tracing that is most important for detecting life-threatening arrhythmias is the:

The ST segment reflects the:

While analyzing an ECG you cannot identify a Q wave. This means:

In lead II placement, the positive lead is located on the:

The sinoatrial node:

The Starling law states that:

From PAR 2000, atropine works by inhibiting: