Why the study?
Does passive head-up tilt alter left ventricular systolic time intervals in normal subjects compared to patients with congestive heart failure?
Does passive head-up tilt alter left ventricular systolic time intervals in normal subjects compared to patients with congestive heart failure?
Systolic time intervals respond dynamically to postural circulatory stress in normal subjects, but this response is blunted in congestive heart failure and can be partially restored following diuresis.
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Blunted tilt response in HF suggests impaired reserve; leaves open whether systolic time intervals add value to modern assessment.
Stafford et al. (1970) studied this question.
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