7.1 Cardiovascular, Respiratory & Blood/Lymphatic Systems

The cardiovascular system is one of the highest-frequency terminology domains on the CoreCHI exam, and cardiac encounters are among the most time-sensitive assignments a healthcare interpreter will take. The heart is a four-chambered muscular pump—two upper atria and two lower ventricles—separated by one-way valves (the mitral, tricuspid, aortic, and pulmonic valves) that keep blood flowing in a single direction. Blood leaves the left ventricle through the aorta and travels through arteries to the body; it returns through veins to the right atrium, is pumped to the lungs for oxygenation, and returns to the left atrium to begin the cycle again. The heart muscle itself is supplied by the coronary arteries, which branch directly off the aorta.

An interpreter does not need to practice medicine, but does need to render cardiac terminology with zero ambiguity, because a missed or softened word in this system can change a clinical decision.

High-Frequency Cardiovascular Conditions

Blood pressure readings illustrate why numeric precision matters so much in this system. A reading is always expressed as systolic over diastolic (for example, 140/90)—the pressure while the heart contracts over the pressure while it rests between beats. An interpreter who transposes the two numbers, drops a digit, or rounds a value has altered a clinical fact, not just a word choice. The same discipline applies to heart rate (beats per minute) and any lab value tied to cardiac risk, such as cholesterol or troponin levels mentioned during an MI workup.

Cardiology-specific specialty vocabulary an interpreter should recognize on sight includes angina (chest pain from reduced blood flow, distinct from an MI), stent and angioplasty (procedures to reopen a blocked artery), bypass surgery (CABG, rerouting blood around a blockage), and pacemaker or defibrillator (implanted devices that regulate heart rhythm). Because CHI candidates are tested on both the English knowledge exam and a bilingual performance exam, these terms must be recognizable not only in isolation but inside fast-paced dialogue, where a provider may switch between the lay term ("heart attack") and the clinical term ("MI" or "myocardial infarction") within the same sentence.

Interpreting Symptom Descriptions Accurately

Patients rarely describe cardiac symptoms in textbook language. A patient may say the pain feels like "an elephant sitting on my chest," "a tight band," or "burning that goes up my neck." The interpreter's job is to render the patient's own words and register, not to translate the description into a clinical diagnosis like "this sounds like angina." Converting a patient's lay description into a diagnostic label is outside the interpreter's role and can mislead the clinical team about what the patient actually reported. The same principle applies in reverse: when a cardiologist explains a diagnosis using technical language, the interpreter renders the technical content faithfully, adding a plain-language equivalent only if the standards of practice and setting call for it, and doing so transparently.

Because 25% of the CoreCHI exam tests healthcare terminology and cardiovascular content appears disproportionately often in real hospital and clinic assignments (emergency departments, cardiology clinics, post-operative units), candidates should be able to move fluidly between the lay term, the clinical term, and, on the bilingual performance exam, the equivalent term in their working language, without losing precision in any direction.

The respiratory system moves oxygen into the blood and carbon dioxide out of it. Air travels through the nose or mouth, down the trachea, into the bronchi, and finally into millions of tiny air sacs called alveoli, where gas exchange with the bloodstream occurs. The diaphragm, a muscle beneath the lungs, contracts to pull air in and relaxes to push air out. Because breathing difficulty is one of the most common chief complaints an interpreter will encounter, in emergency departments, pulmonology clinics, and urgent care alike, respiratory terminology is tested heavily on the CoreCHI exam.

High-Frequency Respiratory Conditions

• Asthma — chronic airway inflammation with episodes of bronchospasm (the airway muscles tighten), causing wheezing, coughing, and shortness of breath; often triggered by allergens, exercise, or cold air, and managed with inhalers (rescue vs. controller medications).
• Chronic obstructive pulmonary disease (COPD) — a progressive, largely irreversible condition combining emphysema (destruction of alveoli, reducing gas-exchange surface) and chronic bronchitis (long-term airway inflammation with mucus production); strongly associated with smoking history, which providers routinely ask about.
• Pneumonia — infection of the lung tissue in which the alveoli fill with fluid or pus, impairing oxygen exchange; can be bacterial, viral, or fungal, with severity ranging from outpatient treatment to hospitalization.

Interpreters should distinguish dyspnea (the clinical term for shortness of breath) from patient phrasing like "I can't catch my breath" or "it feels tight," rendering the patient's own description rather than substituting the clinical label. Oxygen saturation (measured by pulse oximetry, expressed as a percentage) is another number-precision point: a reading of 92% and a reading of 82% describe very different levels of urgency, so digits must be interpreted with total accuracy.

The Blood and Lymphatic System

Blood is composed of red blood cells (RBCs), which carry oxygen via hemoglobin; white blood cells (WBCs), which fight infection; platelets, which enable clotting; and plasma, the liquid component that carries all of the above plus proteins, hormones, and nutrients. The lymphatic system runs alongside the circulatory system, draining excess fluid from tissues, filtering it through lymph nodes, and supporting immune function.

Conditions an interpreter should recognize:

Leukemia and lymphoma sit at the intersection of the blood/lymphatic system and oncology, a reminder that CCHI's body-system domains overlap in real encounters. An interpreter assigned to a hematology-oncology clinic will move between terms for blood components, cancer staging, and treatment (covered further in the pharmacology and procedures section of this chapter) within a single visit.

Specialty Vocabulary and Clinical Settings

Recognizing the medical specialty tied to a body system helps an interpreter anticipate vocabulary before an encounter begins. Cardiology treats heart conditions; pulmonology treats lung conditions; hematology treats blood disorders; and hematology-oncology combines blood-cancer treatment with general oncology. A patient referred from a primary care visit to a "pulmonologist" or a "cardiologist" is being referred to a specialist in one of these systems, and recognizing the specialty name itself is often the first terminology cue an interpreter receives about the content of the upcoming encounter.

Because the CoreCHI exam draws terminology questions from real clinical contexts rather than a fixed glossary, the most reliable preparation is repeated exposure to these terms in context: reading patient education materials, reviewing discharge instructions, and practicing both the lay and clinical register for each condition in this section.