15.5 Emergencies, Pharmacology, Ethics and Preliminary Findings

Recognize when the examination must yield to patient care

A vascular sonographer must recognize deterioration, activate help, and communicate findings within professional scope. A technically elegant image is not the priority when a patient collapses, develops new neurologic symptoms, or has a threatened limb. Know the department's emergency number, equipment locations, escalation pathway, and responsibilities before beginning the examination.

For an unresponsive adult, check responsiveness and summon help. A healthcare professional evaluates breathing and pulse together for no more than ten seconds. If there is no normal breathing and no definite pulse, activate the emergency response system, obtain an automated external defibrillator (AED), and begin high-quality cardiopulmonary resuscitation (CPR) according to current training. Gasping is not normal breathing. Do not delay CPR while trying to finish an ultrasound image or locate a perfect pulse waveform.

Adult basic life support essentials

• Compress at 100–120 per minute in the center of the chest.
• For an average adult, use a depth of at least 5 cm, avoiding excessive depth beyond 6 cm.
• Allow complete recoil and minimize interruptions.
• Before an advanced airway, trained rescuers generally use 30 compressions to 2 breaths.
• Apply the AED promptly, follow its instructions, clear the patient during analysis/shock, and resume CPR promptly.

These are adult principles. Pediatric protocols and special situations require their own training. If a pulse is definitely present but breathing is absent or inadequate, provide appropriate ventilatory support through the trained responder pathway rather than assuming cardiac arrest. Use current certification, local procedures, and the responding team's direction.

Other vascular-laboratory emergencies

Acute stroke symptoms include sudden focal weakness, speech difficulty, facial asymmetry, or visual disturbance. Record the reported onset or last known well when available and activate the appropriate emergency response. A carotid examination must not delay acute stroke assessment. A normal extracranial carotid image does not exclude intracranial stroke.

Acute limb ischemia can produce sudden pain, pallor, coldness, sensory loss, weakness, and absent arterial signals. Progressive neurologic deficit is especially concerning. Compartment syndrome can cause severe pain, tense swelling, and pain with passive stretch even while a major arterial pulse remains detectable. Escalate urgently; a palpable pulse does not establish adequate tissue perfusion.

Pulmonary embolism may cause sudden breathlessness, chest pain, syncope, tachycardia, or hypoxemia. Stop routine testing and activate clinical assessment. A leg duplex cannot exclude PE. Severe swelling and cyanosis from phlegmasia similarly require urgent evaluation because venous outflow obstruction can threaten the limb and systemic stability.

Pharmacology that changes the examination context

The RVS knowledge list includes basic pharmacology. The sonographer needs to understand why a medication matters to history, technique, or findings rather than independently prescribe treatment.

Do not tell a patient to stop anticoagulation before routine duplex on your own authority. A diagnosis on an ultrasound worksheet is not a medication order. If bleeding, allergy, hypotension, or another adverse effect is suspected, notify the appropriate clinician and follow the emergency process. Record what the patient reports without inventing a dose or assuming every patient on a medication has the same indication.

Ethics, privacy, and scope

Obtain appropriate consent and explain the examination in understandable language. Respect refusal and document it through the facility's process. Use interpreters when needed rather than treating silence as understanding. Protect patient information under applicable privacy rules; access and share information for authorized care and permitted purposes. Public discussion of a patient's recognizable images is not justified merely because the case is educationally interesting.

Maintain accurate records. Do not change a measured velocity to make it fit the expected diagnosis or copy a prior report as if a new examination were performed. Correct documentation through the proper amendment process so that the original record and correction remain traceable. Report equipment failures, near misses, and safety concerns through the quality system. A diagnostic discrepancy should lead to review and improvement rather than concealment.

Preliminary findings and critical-result communication

A useful preliminary worksheet identifies the patient, indication, side, vessels examined, findings, measurements, limitations, and comparison with previous studies. Distinguish observed facts from interpretation. “Noncompressible common femoral vein with intraluminal material” is an observation; the final diagnostic interpretation belongs to the authorized interpreting clinician under local policy.

Label a preliminary result as preliminary. For urgent findings, contact the responsible clinician through the defined pathway and document the date, time, recipient, findings conveyed, and actions taken. Use read-back or confirmation when required. If the first contact is unavailable, follow the escalation policy; placing an unread report in a queue is not completed urgent communication. A substantially changed final interpretation also requires the laboratory's discrepancy-notification process.

Worked communication scenario

During a venous examination, you identify a new extensive proximal thrombus. The patient then develops chest pain and breathlessness. Stop routine scanning, activate urgent clinical assessment, and communicate both the symptoms and preliminary imaging findings. Document the recipient and time. Do not wait for every calf image before escalating, and do not reassure the patient that the leg study determines whether a pulmonary embolism is present.

AHA adult BLS guidance, 2025 and IAC reporting/urgent communication standards, August 2026 — checked October 18, 2026.

Regulatory standards in daily work

The HIPAA Privacy Rule governs protected health information for covered entities and their business associates. Authorized treatment communication is different from curiosity-driven chart access or public sharing. Confirm the recipient and use approved clinical channels for reports and images. A patient's name, images, and clinical details can remain identifiable even when an informal message omits one obvious identifier. Follow the facility's privacy process and applicable law when disclosure, teaching use, or patient access questions arise.

OSHA bloodborne-pathogen requirements concern occupational exposure. Know the exposure-control plan, required training and protective equipment, sharps procedures, and how to obtain prompt evaluation after an exposure. A needlestick or mucosal exposure is a staff-safety event requiring the defined response; do not conceal it or assume a clean-looking needle is risk-free. These legal duties differ from voluntary laboratory accreditation, while institutional procedures implement both in daily work.

HHS HIPAA overview and OSHA bloodborne-pathogen overview — checked October 18, 2026.