Advantages of TTM for a portable EKG include:

Disadvantages of TTM for a portable EKG include:

• The equipment will not work if improperly activated or misused.
  
  
• The equipment may not detect some abnormal heart rhythms (arrhythmias) and slow heartbeats (bradycardia).
  
  
• Landline telephone availability is required in most cases. Cordless phones and cell phones cannot be used because of electrical interference.
  
  
• Very brief symptoms may not be adequately recorded.
  
  
• A fainting episode (syncope) may go unrecorded while the patient is unconscious and unable to use the phone.