T1 L8 - Intro to ECG

• Once large 'cell' having many nuclei that are not separated by cell membrane?

  Syncytium
• Many cells functioning as one?

  Functional syncytium
• Type of cardiac myocyte cells that set heart's rhythm?

  pacemaker cells
• Type of cardiac myocyte cells that transit rhythm throughout the heart?

  conducting cells
• Cardiomyocytes are linked by low resistance pathways associated with gap junctions at the intercalated discs.
• What conduct impulse from SA node to AV node?

  internodal bundles
• The ___ means that ventricles contract after atria to permit longer and more effective ventricular filling. ?

  electrical delay
• Action potential conducted very slowly in AV node (0.05 m/s)
• Order of depolarisation of the ventricular wall?

  septum, apex, atrioventricular groove
• Purkinjee fibres transmit impulse rapidly to the main mass of the ventricles.
• Configuration of electrodes?

  lead
• Bottom one or two lines in ECG, spanning to the whole 10 seconds of a specific lead?

  rhythm strip
• Depolarisation of the atria in response to SA node triggering?

  P wave
• Depolarisation of ventricles, triggers main pumping contractions?

  QRS complex
• Ventricular repolarisation?

  T wave
• Delay of AV node to allow filling of ventricles?

  PR segment
• Beginning of ventricle repolarisation, should be flat?

  ST segment
• Large (deep) Q waves are a sign of what?

  dead tissue (old MI)
• When the heart rhythm is generated from the Sino-atrial node?

  sinus rhythm
• When the SA node is beating too quickly?

  Sinus tachycardia