Question 2831
{"accessible":false,"alternatives":[{"id":13815,"text":"direction of blood flow"},{"id":13816,"text":"heart rate"},{"id":13817,"text":"peak systolic velocity"},{"id":13818,"text":"pulse pressure"},{"id":13819,"text":"resistive index"}],"archived":false,"correctAlternativeId":13818,"explanation":"\u003cp\u003ePulse pressure is the difference in systolic and diastolic blood pressures. Spectral Doppler illustrates velocity and directional changes of blood flow over time. There is no direct pressure information in the waveform.\u003c/p\u003e\u003cp\u003eIn arterial waveforms the number of systolic peaks can be used to assess heart rate. \u003c/p\u003e\u003cp\u003eResistive index can also be calculated:\u003c/p\u003e\u003cp\u003eResistive index = (peak systolic velocity - end diastolic velocity) / peak systolic velocity\u003c/p\u003e","id":2831,"imageUrl":null,"imageAttribution":null,"imageAttributionCaseInfo":null,"firstQuestionPath":"/questions/2833","nextQuestionPath":"/articles/spectral-doppler-ultrasound/questions/2830","relatedArticles":[{"id":69299,"title":"Blood pressure","link":"/articles/blood-pressure?lang=us"},{"id":69299,"title":"Blood pressure","link":"/articles/blood-pressure?lang=us"},{"id":78174,"title":"Resistive index (vascular ultrasound)","link":"/articles/resistive-index-vascular-ultrasound?lang=us"},{"id":78164,"title":"Peak systolic velocity (Doppler ultrasound)","link":"/articles/peak-systolic-velocity-doppler-ultrasound?lang=us"}],"alsoUsedIn":[{"id":1620,"kind":"RestrictedPage","title":"Page 1620 (in no courses)","link":"https://radiopaedia.org/admin/restricted_pages/1620"},{"id":1984,"kind":"Course","title":"Imaging Physics: Ultrasound Peer Review - page 1984","link":"https://radiopaedia.org/courses/imaging-physics-ultrasound-peer-review/pages/1984"},{"id":1984,"kind":"Course","title":"Imaging Physics: Ultrasound - page 1984","link":"https://radiopaedia.org/courses/imaging-physics-ultrasound/pages/1984"}],"stem":"\u003cp\u003eWhich of the following parameters can NOT be assessed on an arterial spectral waveform in a healthy patient?\u003c/p\u003e","menuLinks":[{"text":"Report problem with question","url":"https://docs.google.com/forms/d/e/1FAIpQLSfO3soWYhOjJ7yErSysyCe5V4A1CqW7WK3rDA7MtAkecMGqNw/viewform?entry.1624461248\u0026entry.553583435=https://radiopaedia.org/questions/2831"}],"attemptsPercentages":[{"alternativeId":"13816","percentage":10},{"alternativeId":"13818","percentage":64},{"alternativeId":"13817","percentage":2},{"alternativeId":"13815","percentage":15},{"alternativeId":"13819","percentage":10}],"promptToLogin":false,"questionManager":false,"articleId":"spectral-doppler-ultrasound"}