Holter Monitoring:
24 hours ambulatory ECG monitoring:

Holter Monitoring is a continuous recording of heart rhythm  (ECG) during normal activity.
The monitor is worn for approximately 24 hours to obtain a
recording throughout a day and night.
Electrodes are placed on the  chest area with the leads attached to a small recorder.

Some indications for  Holter monitoring include:

1-  Palpitations
2-  Irregular rhythm/escape beats
3   Dizziness
4-  Blackouts
5-  Shortness of  breath
6-  Angina/chest pain
7-  Observing the effect of drug therapy and also how  your heart
     responds to normal activity
8-  Patient with a pacemaker
9-  Tachycardia
10- Bradycardia
Ambulatory Blood Pressure Monitoring (ABPM):

Ambulatory Blood Pressure Monitoring (ABPM), it is small machine which provide multiple automatic measurements of blood pressure at specific intervals throughout 24 or more hours, normally each 20 to 30 minutes during your normal activities, and 45 to 60 minutes during the sleeping time.

 Patient self-measured blood pressure levels can complement those
measured by the doctor to give a more complete, accurate picture of the patient’s blood pressure, and help doctors to make more informed therapeutic decisions.

 Blood pressure levels measured by the patient at home or at work are usually lower than those measured by the doctor in the clinic setting (the white coat effect), and more closely approximate levels
measured by 24-hour ambulatory blood pressure monitoring ABPM).