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Rhythm of Life CPR Timer
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About CPR


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Many medical and traumatic conditions exist that may cause a patient to stop breathing (respiratory arrest) or become pulseless and non-breathing (cardiopulmonary arrest). Both professional and trained lay rescuers receive CPR training to provide life saving interventions during these critical medical emergencies. The American Heart Association creates guidelines that drive CPR education in the United States and periodically revise these guidelines based on the latest medical research.

Disclaimer: The following information is provided as general background information and should not be considered a substitute for formal education, advice of a healthcare provider, or training in CPR or any other medical procedure. The following statements are purely the opinion of Rapid Response Solutions, LLC and although every effort has been made to ensure accuracy and completeness always defer to the American Heart Association Guidelines, local protocol, policy/procedure, formal education, and local healthcare professionals for clinical guidance.

Rescue Breathing

Rescue breathing is a procedure performed by trained rescuers on a patient who has inadequate breathing (agonal respirations) or who has completely stopped breathing (respiratory arrest) and still maintains a pulse. During this procedure the rescuer opens the patient's airway and provides breaths via a barrier device such as a CPR mask or ventilates the patient using a bag valve mask. Advanced rescuers may place a breathing tube (advanced airway) and ventilate a patient in respiratory arrest via a bag valve mask or mechanical ventilator.

Rescuers must ensure that ventilations are performed at the proper intervals and are delivered over the appropriate period of time with the proper amount of force. Recent research within the healthcare community has shown that both professional rescuers and trained lay rescuers perform ventilations too frequently and with excessive duration and force. This has been found to decrease the flow of blood and increase the amount of air traveling to the patient's stomach thereby increasing the likelihood of vomiting. The Rhythm of Life will prompt rescuers when it is appropriate to ventilate the patient and indicate the proper duration of each ventilation based on the patient's age group and the number of rescuers participating. Click here to learn more about the features and solutions provided by the Rhythm of Life.

Cardiopulmonary Resuscitation (CPR)

CPR is a procedure performed by trained rescuers on a patient who is not breathing and does not have a pulse (cardiopulmonary arrest). The chest is compressed at the appropriate rate and depth, which causes compression of the heart as well as pressure changes in the chest that result in blood flow to the patient's vital organs. Next, the rescue breathing procedure, as described above, is used to ventilate the patient to provide oxygen. Rescuers will alternate performing a series of chest compressions and ventilations. Advanced rescuers may insert a breathing tube (advanced airway) which allows them to compress the chest independent of ventilations.

It is of critical importance that chest compressions be continuously administered without interruption at the proper rate and depth. It takes several compressions to begin the flow of blood that then builds up the necessary amount of pressure to provide oxygen-rich blood to the vital organs. A brief interruption in chest compressions will require additional compressions to "prime the pump" before blood flow can again occur. It is also important to ensure that the rescuer does not provide constant pressure on the chest by leaning on the patient as this negatively affects the expansion of the chest wall and the pressures generated by CPR that result in the flow of blood.

The Rhythm of Life will provide rescuers with continuous prompting to compress the patient's chest at the appropriate rate. The metronome also provides a two-minute timer to signal for a change in the compressor as rotating the rescuer performing compressions reduces fatigue and ensures compressions are performed at the appropriate rate and depth. When using the "CPR" option the metronome will also pause the compression tones to output the appropriate ventilatory rate and ventilation-to-compression ratio based on the patient's age group. The device will determine if it is necessary to pause compressions to allow for ventilations based on the user's selection of ventilations by mask or by advanced airway. Click here to learn more about the features and solutions provided by the Rhythm of Life.

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