Before you perform an ECG on your patient, he informs you that he has a pacemaker but isn't sure what kind. A portion of the ECG tracing is shown here. What type of pacemaker does this patient have? 
Definitions:
Erythrocytes
Red blood cells that carry oxygen from the lungs to the body tissues and carbon dioxide back to the lungs.
Anemic Cells
Anemic cells refer to blood cells, typically red blood cells, that are deficient in hemoglobin, leading to reduced oxygen transport and symptoms of anemia.
Antibodies
Proteins produced by the immune system in response to foreign substances, which they neutralize or mark for destruction.
Fibrinogen
A soluble plasma glycoprotein that is converted by thrombin into fibrin during blood clot formation.
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