Clonus is a rhythmic, involuntary series of muscle contractions and relaxations. It is most commonly noticed at the ankle, but it can occur in other joints and muscles. Clinicians use Clonus as a physical exam sign during a neurologic and spine evaluation. It can suggest changes in how the brain, spinal cord, and nerves control reflexes.

CTA most commonly means **Computed Tomography Angiography**. It is a **CT scan performed with intravenous contrast** to show blood vessels in detail. CTA is widely used to evaluate the **heart arteries (coronary arteries)** and major vessels like the **aorta, carotid arteries, and pulmonary arteries**. Clinicians use CTA to help diagnose vascular disease and guide next-step testing or treatment planning.

Hoffmann sign is a finding on a neurological exam that checks for increased reflex activity in the hand. It is tested by a simple finger movement and watching how the thumb and index finger respond. Clinicians commonly use it when evaluating the cervical spine (neck) and the spinal cord. It is one piece of information and is interpreted alongside symptoms, other exam findings, and imaging.

CT Angiography is a CT scan performed with contrast dye to make blood vessels show up clearly. It helps clinicians see vessel narrowing, blockage, bulges, and other structural changes. It is commonly used in heart and vascular care, including coronary arteries and the aorta. It is also used in emergency and outpatient settings to evaluate chest pain and vascular symptoms.

Babinski sign is a finding on the neurologic exam based on how the toes move when the sole of the foot is stroked. In adults, an “upgoing” big toe (often with fanning of the other toes) can suggest a problem in the brain or spinal cord pathways that control movement. It is commonly used in spine, neurology, emergency, and primary care evaluations when clinicians are checking for nervous system involvement. Babinski sign is not a diagnosis by itself; it is one clue that must be interpreted with the full exam and clinical context.

PVR most commonly means **pulmonary valve replacement** in cardiovascular medicine. It is a procedure that **replaces the pulmonary valve** to improve blood flow from the heart to the lungs. PVR is often used in people with **congenital heart disease**, especially after earlier heart repairs. In some settings, PVR can also mean **pulmonary vascular resistance**, so clinicians clarify the context.

Hyperreflexia means reflexes that are stronger or more easily triggered than expected. It is a clinical finding noticed during a neurological exam. It most often comes up when clinicians evaluate the brain, spinal cord, and nerve pathways. In spine care, it can be a clue to spinal cord involvement, especially in the neck.

Pulse Volume Recording is a noninvasive vascular test that measures pulse-related changes in limb blood volume. It is commonly used to evaluate blood flow in the arms and legs when peripheral artery disease is suspected. The test records waveforms (tracings) that reflect how well arterial blood reaches different limb segments. It is often performed in vascular labs, cardiology practices, and hospital-based diagnostic settings.

Transcranial Doppler is an ultrasound test that measures blood flow in major arteries inside the skull. It uses sound waves to estimate how fast blood is moving through brain arteries. It is commonly used in stroke and neurovascular care, and sometimes in cardiovascular evaluations of blood clots or shunts. It is noninvasive and is typically performed at the bedside or in an ultrasound lab.

Gait disturbance means an abnormal way of walking. It can involve speed, balance, step length, leg motion, or overall stability. It is commonly used as a clinical sign in neurology, spine care, orthopedics, and rehabilitation. It helps clinicians describe function and narrow down possible causes of walking difficulty.