Tachycardia is a heart rate of greater than 100 beats per minute. When the heart beats too quickly, there is a shortened relaxation phase. This causes two main problems: 1) the ventricles are unable to fill completely, causing cardiac output to lower and 2) the coronary arteries receive less blood, causing supply to the heart to decrease.
If at any point you become uncertain or uncomfortable during the treatment of a stable patient, seek expert consultation. The treatment of stable patients can be potentially harmful.
Adenosine may cause bronchospasm; therefore, adenosine should be given with caution to patients with asthma.
Synchronized cardioversion is appropriate for treating wide complex tachycardia of unknown type. Prepare for synchronized cardioversion as soon as a wide complex tachycardia is detected.