HEART FAILURE EVENT DETECTION AND RISK STRATIFICATION USING HEART SOUND
First Claim
1. A system, comprising:
- an ambulatory medical device (AMD) including;
a context detector circuit configured to detect contextual condition associated with a patient, the contextual condition including information correlating to or indicative of a change in metabolic demand of a patient;
a heart sound analyzer circuit configured to sense from the patient a vibratory or acoustic heart sound (HS) signal, generate one or more HS features using the sensed HS signal, and perform a plurality of HS measurements of the one or more HS features in response to the detected patient contextual condition meeting a specified criterion;
a target event indicator generator circuit configured to calculate one or more signal metrics indicative of diastolic function of a heart of the patient using the plurality of HS measurements, the signal metrics including a trend of the one or more HS features; and
a physiologic event detector circuit coupled to the target event indicator generator circuit, the physiologic event detector circuit configured to detect a target physiologic event using the one or more signal metrics.
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Accused Products
Abstract
Devices and methods for detecting heart failure (HF) events or identifying patient at elevated risk of developing future HF events are described. A medical device can detect contextual condition associated with a patient, such as an environmental context or a physiologic context, sense a heart sound signal, and perform multiple measurements of heart sound features in response to the detected patient contextual condition meeting specified criterion. The contextual condition includes information correlating to or indicative of a change in metabolic demand of a patient. The medical device can use the physiologic signals to calculate one or more signal metrics indicative of diastolic function of the heart such as a trend of the heart sound features. The medical device can use the signal metrics to detect an HF event or to predict the likelihood of the patient later developing an HF event.
58 Citations
20 Claims
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1. A system, comprising:
an ambulatory medical device (AMD) including; a context detector circuit configured to detect contextual condition associated with a patient, the contextual condition including information correlating to or indicative of a change in metabolic demand of a patient; a heart sound analyzer circuit configured to sense from the patient a vibratory or acoustic heart sound (HS) signal, generate one or more HS features using the sensed HS signal, and perform a plurality of HS measurements of the one or more HS features in response to the detected patient contextual condition meeting a specified criterion; a target event indicator generator circuit configured to calculate one or more signal metrics indicative of diastolic function of a heart of the patient using the plurality of HS measurements, the signal metrics including a trend of the one or more HS features; and a physiologic event detector circuit coupled to the target event indicator generator circuit, the physiologic event detector circuit configured to detect a target physiologic event using the one or more signal metrics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system, comprising:
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a signal analyzer circuit, including; a context detector circuit configured to receive contextual condition associated with a patient, the contextual condition including information correlating to or indicative of a change in the metabolic demand of a patient; a heart sound analyzer circuit configured to receive a vibratory or acoustic heart sound (HS) signal of the patient, generate one or more HS features using the sensed HS signal, and measure a plurality of HS measurements of the one or more HS features in response to the received patient contextual condition meeting a specified criterion; and a signal metrics generator circuit configured to calculate one or more signal metrics indicative of diastolic function of a heart of the patient using the plurality of HS measurements, the signal metrics including a trend of the one or more HS features; and a risk stratifier circuit configured to generate a composite risk indicator using the one or more signal metrics, the composite risk indicator indicative of the likelihood of the patient developing a future event indicative of a new or worsening of an existing disease. - View Dependent Claims (14, 15)
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16. A method, comprising:
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detecting a contextual condition associated with a patient, the contextual condition including information correlating to or indicative of elevated metabolic demand of a patient; sensing from the patient a heart sound (HS) signal; generating one or more HS features using the sensed HS signal; measuring a plurality of HS measurements of the one or more HS features in response to the detected patient contextual condition meeting a specified criterion; and calculating one or more signal metrics indicative of diastolic function of the heart using the plurality of HS measurements, the signal metrics including a trend of the one or more HS features. - View Dependent Claims (17, 18, 19, 20)
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Specification