Cardiac performance monitoring system for use with mobile communications devices

A non-transitory computer-readable storage medium storing a set of instructions capable of being executed by a smartphone having an accelerometer, that, when executed by the smartphone, causes the smartphone to:

• record a seismocardiogram (SCG) from the smartphone's accelerometer by detecting vibrations on a patient's chest corresponding to heart motion for a first time period;
• and receive an electrocardiogram (ECG) from the patient over the first time period;
• analyze the SCG to determine an index of cardiac function for the patient;
• and do at least one of:
• display, transmit and store the index of cardiac function, wherein the set of instructions, when executed by the smartphone, causes the smartphone to analyze the SCG to determine an index of cardiac function for the patient by taking a ratio of the sum of isovolumetric contraction time (ICT) and isovolumetric relaxation time (IRT) divided by the left ventricle ejection time (ET).

A method of determining an index of cardiac function for a patient using a smartphone having an accelerometer, the method comprising:

• placing the smartphone on the patient's chest;
• recording a seismocardiogram (SCG) for a first time period using the smartphone's accelerometer;
• receiving an electrocardiogram (ECG) in the smartphone, wherein the ECG is recorded from the patient over the first time period;
• and analyzing the SCG to determine an index of cardiac function, wherein analyzing the SCG to determine an index of cardiac function comprises analyzing the SCG using the smartphone to determine the index of cardiac function by taking a ratio of the sum of isovolumetric contraction time (ICT) and isovolumetric relaxation time (IRT) divided by the left ventricle ejection time (ET).