How to Document Bruit and Thrill in Medical Records

Documenting a bruit or thrill in the medical record requires you to capture five core descriptors: the anatomical location, the timing within the cardiac cycle, the pitch, the intensity, and any radiation pattern. A bruit is an audible turbulent sound heard with a stethoscope over a blood vessel, while a thrill is the vibration you feel with your fingertips over that same vessel or a surgical connection like a dialysis fistula. Getting these details right matters clinically because a vague note like “bruit present” tells the next clinician almost nothing, while a note specifying “high-pitched systolic bruit over the right carotid bifurcation, radiating to the angle of the jaw, no thrill palpated” tells them quite a lot about what might be happening inside the vessel and what to order next.

What to Include for Every Bruit

When you auscultate a bruit at any site, the medical record entry should walk through a consistent set of characteristics. Abdominal bruits, for instance, are typically described by pitch, timing, amplitude, and location in clinical practice as a way to narrow the differential between conditions like renovascular disease, aortic disease, and hepatic vascular abnormalities.

That same framework applies regardless of where you hear the sound. A well-documented bruit entry covers:

Location: the specific artery or anatomical landmark, such as “left carotid bifurcation,” “periumbilical region two centimeters to the right of midline,” or “over the AV fistula at the left forearm anastomosis.”
Timing: whether the bruit is systolic only, continuous (systolic and diastolic), or specifically late systolic. A systolic-only bruit and a continuous bruit carry different clinical implications even at the same site.
Pitch: low, medium, or high. Higher pitch at a given site generally correlates with faster flow velocity through a narrower lumen, though the relationship is not perfectly linear.
Intensity: soft, moderate, or loud. Some clinicians use a grading scale analogous to cardiac murmur grading, but there is no universally adopted numbered system for peripheral bruits. Describing whether the bruit is easily audible with light stethoscope pressure or requires firm pressure in a quiet room gives useful context.
Radiation: where the sound travels. A carotid bruit radiating toward the jaw suggests an internal carotid origin, while one heard best at the supraclavicular fossa might come from a more proximal source.

Equally important is documenting when these findings are absent. Writing “no bruit auscultated over the bilateral carotid arteries” or “no thrill palpable at the fistula site” confirms you actually performed the exam, rather than simply forgot to mention it. A silent chart is ambiguous; a documented negative finding is information.

What to Include for Every Thrill

A thrill is the tactile counterpart of a bruit. Turbulence inside a vessel vibrates the vessel wall, and when that vibration is strong enough, you can feel it through the skin. This happens because turbulent blood flow produces oscillations in the vessel wall itself, a mechanical process that can even contribute to degenerative changes in vascular tissue over time.

When you document a thrill, the record should capture:

Location: the exact point where the vibration is strongest, using anatomical landmarks or distance from a surgical anastomosis.
Character: whether the thrill is continuous or intermittent, and whether it is fine (a gentle buzzing) or coarse (a strong rumbling sensation).
Timing: whether it corresponds to systole only or extends through both phases of the cardiac cycle. A healthy arteriovenous fistula for dialysis typically has a continuous thrill, so a thrill that becomes intermittent or systolic-only can signal developing stenosis.
Change from prior exams: if you have access to previous notes, documenting whether the thrill has strengthened, weakened, or changed character is one of the most clinically useful things you can add.

For dialysis access sites specifically, physical examination has been shown to have acceptable sensitivity and specificity for detecting fistula maturation problems and stenosis.

That means the findings you write down actually carry diagnostic weight. A note that reads “continuous thrill palpable at the arterial anastomosis of the left radiocephalic AVF, soft and buzzing, unchanged from prior assessment” tells the vascular access team the fistula is functioning. A note that says “thrill present at the AVF” wastes an opportunity to communicate something meaningful.

Documenting Carotid Bruits

The carotid arteries are probably the most commonly auscultated peripheral vessels, and the documentation stakes are high because a carotid bruit can indicate stenosis that puts a patient at risk for stroke. But the relationship between what you hear and what is actually happening inside the artery is more complicated than many clinicians appreciate.

In one observational study, about a third of patients sent for carotid ultrasound because of a bruit turned out to have significant stenosis of 50% or more. Among patients with stenoses in that range, the bruit had a sensitivity of roughly 71% and a specificity of about 81%.

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Sensitivity was highest for stenoses in the 70–99% range, where it reached about 77%. But here is the critical wrinkle: for completely occluded carotid arteries, sensitivity dropped to just 26%. A vessel with no flow, or near-total obstruction, produces little or no turbulence and therefore little or no sound.

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Separate research confirmed this pattern: while about 69% of vessels with significant stenosis produced a bruit, the sound was often absent at the highest degrees of narrowing and in occluded vessels. And not every cervical bruit originates from the internal carotid. The sound may come from a diseased external carotid artery or from turbulence transmitted upward from a more proximal source like the aortic arch.

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What this means for your documentation: always record the side, the precise location over the neck (low, mid, or at the bifurcation), the timing, and any radiation. If the bruit is absent, say so. And if you are comparing to a previous visit, note any change. A bruit that was present last month and is now absent could mean the stenosis has worsened to near-total occlusion, not that the patient has improved. That kind of clinical reasoning only works when the prior note was specific enough to compare against.

Abdominal and Renal Bruits

Abdominal auscultation for bruits is part of the standard workup for secondary hypertension, and the way you document what you find shapes whether anyone acts on it. The location of an abdominal bruit narrows the differential considerably. A bruit heard in the epigastric region near midline raises concern for aortic disease or celiac artery stenosis. One heard a few centimeters lateral to midline, particularly in a hypertensive patient, points toward renal artery stenosis. Bruits heard in the right or left upper quadrants may implicate hepatic or splenic vascular abnormalities.

Timing matters more here than at some other sites. A systolic-only abdominal bruit in a thin, young patient is often benign. A bruit that extends into diastole at the same location is a stronger indicator of hemodynamically significant stenosis. Your note should capture that distinction explicitly, because a referral for renal artery imaging based on “abdominal bruit” alone leaves the radiologist or nephrologist guessing about how worried they should be, while “continuous systolic-diastolic bruit in the right paraumbilical region” conveys urgency.

Dialysis Access Assessment

Hemodialysis patients with arteriovenous fistulas or grafts are a population where bruit and thrill documentation happens repeatedly and has direct consequences for intervention decisions. A functioning AV fistula produces a continuous low-pitched bruit and a continuous thrill at the anastomosis. Changes in these findings are early warning signs of complications like stenosis, thrombosis, or steal syndrome.

When documenting a dialysis access exam, go beyond “thrill present, bruit present.” Record the character of each finding at specific points along the access: the arterial anastomosis, the mid-segment, and the venous outflow. A thrill that is strong at the anastomosis but absent at the venous end suggests a developing stenosis between the two. A bruit that has become high-pitched compared to the last visit may indicate worsening narrowing. Physical exam carries real diagnostic accuracy for these problems, so your notes are doing clinical work, not just satisfying a checkbox.

Some dialysis centers are beginning to adopt digital stethoscopes that can record bruit sounds directly into the patient’s medical record. A multicenter study across 12 dialysis centers in Europe and Asia used a digital stethoscope connected to patients’ records to collect AVF bruit recordings, then applied an AI algorithm to help detect high-pitched bruits that may signal stenosis.

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This kind of technology does not replace your written description, but it adds an objective audio file to the record that can be compared over time. For now, it remains an emerging tool rather than standard practice, but it signals where documentation is heading.

When a Bruit Is Not Pathological

Not every bruit you hear needs to trigger alarm in the chart. Young, thin patients commonly have benign arterial sounds, particularly in the supraclavicular region. The supraclavicular arterial bruit can sometimes mimic aortic or pulmonary valve stenosis when it radiates toward the base of the heart. The distinguishing features are its delayed onset after the first heart sound, its brief duration, and the fact that it is louder in the neck than over the chest. Compressing the subclavian artery typically abolishes or changes the sound, which helps confirm its benign origin.

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Documenting a benign bruit clearly is just as important as documenting a worrisome one. A note like “brief systolic bruit heard over the right supraclavicular fossa, abolished with subclavian compression, consistent with benign arterial bruit” prevents unnecessary downstream workup. Without that level of detail, a subsequent clinician reading “systolic bruit, neck” might reasonably order an echocardiogram or carotid duplex that would not have been needed.

Dynamic Maneuvers and How to Record Them

Most clinicians are familiar with dynamic auscultation for cardiac murmurs, using maneuvers like Valsalva or squatting to alter hemodynamics and change the sound. Fewer know that similar techniques exist for peripheral vascular bruits. These maneuvers work by changing blood flow into or away from a critical stenosis, as well as flow through side-branch arteries, which can accentuate a bruit or help localize its source.

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For example, compressing a vessel distal to a suspected stenosis can increase the pressure gradient across the narrowing and make the bruit louder, while releasing it reduces the sound. Hyperemia maneuvers, like having the patient exercise a limb, increase flow and may bring out a bruit that was borderline audible at rest. These techniques are underused in everyday practice, but when you do use them, the documentation should describe the maneuver, the effect on the bruit, and your interpretation. A note reading “right femoral bruit accentuated with distal compression of the superficial femoral artery, consistent with proximal SFA stenosis” adds a layer of clinical reasoning that a static description cannot.

Why Structured Templates Make a Difference

One of the biggest problems with bruit and thrill documentation is not that clinicians lack the knowledge to describe what they find, but that free-text notes are inconsistent and frequently incomplete. The fix that has the most evidence behind it is surprisingly low-tech: standardized note templates.

A study of neurovascular examination documentation for pediatric fractures found that implementing a structured note template increased the rate of complete vascular examinations from under 4% to 85%. The odds of a complete vascular exam being documented were roughly 70 times higher when clinicians used the template.

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That study was in orthopedic surgery rather than vascular medicine, but the principle transfers directly. If your EHR template for a vascular exam includes fields for bruit location, timing, pitch, and intensity, and separate fields for thrill presence, character, and location, clinicians fill them in. If the template just has a free-text box labeled “vascular exam,” most people write “intact” and move on.

Building a useful template does not require institutional buy-in or a committee. Even a personal smart phrase or text expander that populates a skeleton like “Bruit: [present/absent], Location: ___, Timing: ___, Pitch: ___, Intensity: ___, Radiation: ___ / Thrill: [present/absent], Location: ___, Character: ___, Timing: ___” will force you to address each element every time. The research on templates is clear that the structure itself drives completeness, not the clinician’s motivation or knowledge level.

Common Documentation Pitfalls

A few patterns show up repeatedly in charts that make bruit and thrill notes less useful than they should be:

Absent means nothing: Writing nothing about bruits or thrills leaves future readers wondering whether the exam was performed and was normal, or was simply skipped. Always document a negative finding explicitly.
Vague location: “Bruit heard in neck” does not tell anyone whether the sound is at the carotid bifurcation, the supraclavicular fossa, or radiating from the chest. Be anatomically specific.
No timing: Systolic-only and continuous bruits have different clinical meanings at nearly every vascular site. Omitting timing strips the finding of half its diagnostic value.
No comparison to prior: If the patient has been seen before and a bruit was previously documented, note whether the current finding is unchanged, new, or resolved. Change over time is often more informative than a single snapshot.
Mixing up source and radiation: A bruit heard in the neck might originate from the carotid, but it could also be a cardiac murmur radiating upward or turbulence transmitted from the subclavian or aortic arch. If you suspect the sound is transmitted rather than local, say so. A cervical bruit can come from a diseased external carotid or from a more proximal source entirely.

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Recording the Absence of Expected Findings

In vascular surgery and nephrology, what you do not find can matter more than what you do. A dialysis fistula that has lost its thrill needs urgent evaluation. A carotid bruit that was present at the last visit and is now absent could indicate progression to complete occlusion rather than resolution of disease. The sensitivity of bruits for complete carotid occlusion is only about 26%, meaning three-quarters of fully blocked arteries are silent.

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Your note should make the absence of findings unmistakable. Instead of leaving the bruit field blank, write “no bruit auscultated” with the specific location. If a thrill was expected (as with a dialysis access), document that it was sought and not found: “no thrill palpated at the arterial or venous anastomosis of the left brachiocephalic AVF.” This kind of pertinent negative documentation can be the trigger that gets the patient to interventional radiology the same day rather than drifting for weeks.

Digital Stethoscopes and Audio Documentation

Traditional documentation relies on the clinician translating what they hear or feel into words. That translation inevitably loses information: two examiners may describe the same bruit differently, and the same examiner may use different language on different days. Digital stethoscopes offer a partial workaround by capturing the actual sound and attaching it to the patient’s record.

The multicenter study using AI-assisted analysis of AVF bruits recorded sounds from 65 patients across 12 dialysis centers and linked those recordings directly to medical records.

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This approach has a few advantages for documentation. An audio recording is objective and reproducible. It can be compared to future recordings from the same patient without relying on verbal descriptions. And if an algorithm can flag high-pitched components that the human ear might miss in a noisy dialysis unit, it adds a layer of surveillance that written notes cannot provide.

This technology is still in early research phases and is not widely available. But even without AI analysis, the simple act of attaching a brief audio clip to a vascular access note gives the next clinician something concrete to listen to. If your facility has digital stethoscope capability, consider pairing your written description with a saved recording. The written note still matters for searchability and quick reference, but the audio file adds objectivity that words alone cannot achieve.

1
JAMA. Is Listening for Abdominal Bruits Useful in the Evaluation of Hypertension?
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Journal of Neurosurgery. Turbulence in human intracranial saccular aneurysms
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PubMed Central. Application of Physical Examination in Assessing Arteriovenous Access: A Narrative Review
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PubMed Central. Carotid bruits as predictor for carotid stenoses detected by ultrasonography: an observational study
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British Journal of Surgery. Carotid artery bruit: Association with internal carotid stenosis and intraluminal turbulence
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PubMed. AI-assisted detection of high-pitched bruits in arteriovenous fistulas using a digital stethoscope
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American Heart Journal. The supraclavicular arterial bruit
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The American Journal of Medicine. Dynamic vascular auscultation
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PubMed Central. Standardized Note Templates Improve Electronic Medical Record Documentation of Neurovascular Examinations for Pediatric Supracondylar Humeral Fractures