Dec 16, 2025 · The sniff test is a dynamic ultrasound or fluoroscopic assessment of maximal diaphragmatic excursion used to evaluate unexplained dyspnea or orthopnea, recent elevation …

Nov 4, 2025 · Fluoroscopic examination of the diaphragm ("sniff test") is useful in diagnosing diaphragmatic paralysis. In normal individuals, both hemidiaphragms typically descend with …

Case Discussion Good example of diaphragm paralysis due to phrenic nerve palsy. See sniff test for a description of the procedure.

Normal excursion of both hemidiaphragms was observed during quiet inspiration and expiration. During the sniff test, normal diaphragmatic relaxation was identified on both sides. No …

On the sniff test there is paradoxical elevation of the left hemidiaphragm most marked at end inspiration and early expiration constituting a positive test for left diaphragmatic paralysis.

Procedure: Before fluoroscopy, ask the patient to practice deep breathing and sniffing. In AP position, record two or three quiet breaths, followed by two or three deep breaths and finally …

Jul 22, 2025 · An elevated hemidiaphragm may result from direct and indirect causes which include: above the diaphragm 1 decreased lung volume atelectasis/collapse prior lobectomy or …

Jun 11, 2024 · The fluoroscopic sniff test is a useful addition to diaphragm fluoroscopy and is used to evaluate diaphragmatic contraction and excursion in patients with suspected phrenic …

The right diaphragm demonstrates markedly reduced excursion and sniff motion when compared to the left. The left diaphragm demonstrates normal excursion and sniff responses.

Patient Data Age: 50 years Gender: Male From the case: Phrenic nerve palsy with positive sniff test x-ray