The phrase "a rapid relapse" is correct and usable in written English.
It can be used in contexts discussing health, recovery, or behavioral issues where someone quickly returns to a previous state after improvement.
Example: "After a few weeks of progress, she experienced a rapid relapse into her old habits."
Alternatives: "a swift return" or "a quick setback".
Maitland says their analysis showed children given the bolus made a quick recovery and then had a rapid relapse.
Both can provoke a rapid relapse into depression in SD-responders.
Recovery sleep, naps and even very short episodes of sleep (microsleep; MS) during SD have been shown to provoke a rapid relapse into depression.
Pharmacological inhibition of 5-HT synthesis can induce a rapid relapse of depression symptoms in SSRI-treated patients with remitted depression, an effect which is not readily observed in subjects with no history of SSRI administration [27], [37] [44] (also see [45]).
It is likely that a rapid relapse relates to incomplete resolution of the previous exacerbation rather than a second new exacerbation.
However, many of these reports note a rapid relapse of symptoms or the development of important side effects like Cushing's syndrome and hypertension.
Mantle cell lymphoma (MCL) is characterised by an aggressive clinical course, with rapid relapse after an initial response or primary resistance to standard chemotherapy (Jares et al, 2007).
Excess PR-A levels correlate with poorer disease-free survival and more rapid relapse following tamoxifen treatment [ 26].
Several studies have shown an increased risk of relapse [ 3, 4] and rapid relapse [ 5] in patients with residual symptoms after response without remission.
On the other hand, the rapid relapse and death of patients with an early cancer was reported even after an apparently complete surgical removal of the tumor, with undetectable levels of residual tumor burden and without signs of metastasis.
Further, depressed patients, especially the melancholic ones who have experienced treatment of sleep cycles, are surprised by the rapidity and extent of antidepressant efficacy but are subject to rapid relapse.
