Cardiology Multiple Choice Questions: Volume 2Available at Amazon Kindle Store

Arterial tracing in sinus rhythm

Arterial tracing in sinus rhythm


Arterial tracing in sinus rhythm is seen the third row as red tracing. The display shows a systolic pressure of 133 mm Hg and diastolic pressure of 63 mm Hg. This type of multiparameter monitoring is now commonplace in any high level intensive care unit. Usually a small arterial cannula is placed in the radial artery and connected to the transducer system kept at the bedside using a fluid filled system. Sometimes when a radial artery is not accessible, femoral or even dorsalis pedis arterial cannula can be used.
ECG tracing shows regular P waves followed by QRS complexes indicating sinus rhythm. The QRS complex is wide, indicating underlying conduction system disease. Heart rate is displayed as 85/minute. The respiratory rate is calculated using dynamic changes in thoracic impedance from the ECG electrodes and is displayed as 27/minute. Impedance is calculated by sending a small current across the chest electrodes. The impedance usually increases with inspiration and decreases with expiration. Pulse oximetry is done using a device kept on a finger in which an infra red light and sensor is used to calculate the dynamic changes in oxygen saturation during each pulse wave. Oxygen saturation is displayed as 97%.
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