4 Cardiopulmonary and Vascular Diagnostics
Review how common cardiopulmonary and vascular tests are prepared for, performed, interpreted, and monitored, including important safety findings and follow-up instructions.
Resting ECG
A records the heart’s electrical activity through electrodes placed on the body. The electrodes do not send electricity into the body. The test is painless and usually requires no special preparation; patients should tell the care team about their medicines and should not stop any unless instructed.
The patient should lie still during the test because movement or shivering can interfere with the tracing. Mild skin irritation from the electrodes is possible.
Ambulatory rhythm monitoring
records heart rhythm over time. When wearing a Holter monitor, record the time and activity whenever symptoms such as palpitations occur; this diary helps clinicians relate symptoms to the recorded rhythm.
Follow the monitoring service’s instructions for bathing and device care. Many monitors must be kept dry.
Exercise stress testing
Before an , wear comfortable clothing and walking shoes. Preparation instructions vary: ask the testing team which medicines, foods, or drinks to avoid, disclose all medicines and supplements, and do not change prescribed medication independently.
During testing, staff monitor heart rhythm, blood pressure, breathing, and symptoms. Report chest pain or pressure, severe breathlessness, dizziness, or unusual weakness promptly, and stop when instructed. The team can stop the test and assess and treat the patient. Heart rate and blood pressure continue to be checked during recovery.
Interpreting stress-test changes
that is horizontal or downsloping during exertion may indicate exercise-related myocardial ischemia. It needs clinical interpretation alongside symptoms, the baseline ECG, medications, and the test method. The finding alone does not prove that a heart attack has occurred or provide a definitive diagnosis.
Pulmonary function testing
depends on a good mouth seal and strong, coached breathing efforts. Seal the lips around the mouthpiece, inhale deeply, and exhale forcefully as instructed. Repeated maneuvers may be needed. Forceful breathing can briefly cause coughing or lightheadedness; tell the technician if symptoms occur.
Medication instructions depend on the medicine and the purpose of the test. Some tests compare results before and after a bronchodilator, so the testing team may ask the patient to withhold certain medicines for a specified period. Do not stop prescribed medication without explicit instructions. Loose clothing and avoiding a large meal shortly before testing can also help.
Understanding common patterns
A reduced ratio most commonly suggests an . A low FVC with a preserved ratio can suggest restriction, but lung-volume testing is needed to confirm reduced total lung capacity. Interpret results using appropriate reference limits and the full clinical picture.
Vascular ultrasound
uses sound waves to assess vessels and blood flow. It can help evaluate blockages or clots and is generally noninvasive, with little or no special preparation. Instructions may vary by examination.
Catheterization aftercare
After , staff monitor the puncture site, vital signs, and circulation. Rapid swelling or uncontrolled bleeding at the site may indicate significant bleeding. A cold, blue, numb, or tingling foot may indicate impaired circulation; alert the care team immediately and follow emergency instructions.
A small, stable bruise, mild sleepiness after sedation, and a temporary need to remain in bed as instructed are distinct from those urgent findings. Follow discharge instructions for activity, medications, and when to seek help. Report significant bleeding, swelling, chest pain, or limb changes immediately.