Heart Anatomy and Function

By behereaxum

Summary

Your heart, about the size of a fist, beats every second of your life, driving blood to every cell in your body. It has four chambers.

Chapters

  1. Your heart, about the size of (0s)
  2. It has four chambers. The right (7s)
  3. Every beat starts at the S-A (16s)
  4. On an E-C-G, the P wave (23s)
  5. Each large box equals point-two seconds, (34s)
  6. Watch the QTc: under four-forty in (45s)
  7. So always assess the patient, not (53s)

Transcript

Your heart, about the size of a fist, beats every second of your life, driving blood to every cell in your body. It has four chambers. The right side sends blood to the lungs, while the left side pumps oxygen-rich blood out through the aorta. Four valves keep it all flowing in one direction. Every beat starts at the S-A node, then travels through the A-V node, the Bundle of His, and the Purkinje fibers. On an E-C-G, the P wave is atrial depolarization, the QRS complex is ventricular depolarization, and the T wave is repolarization. Each large box equals point-two seconds, and five large boxes make one second. Using the three hundred rule, three boxes between beats means a heart rate of one hundred. Watch the QTc: under four-forty in men, four-sixty in women. Above five hundred milliseconds raises the risk of dangerous arrhythmias. So always assess the patient, not just the monitor.