The lower ranking is based on individual studies graded according to quality deficiencies. According to the guideline, IIa means: „Evidence from at least one methodologically well-controlled study without randomization.“ B+ means: „‚Should‘ recommendation: Well-conducted clinical studies, but no randomized clinical trials, with direct relevance to the recommendation (evidence levels II or III) or extrapolation from evidence level I if there is no direct relevance to the specific research question.“
That sounds like a contradiction, because there are randomized studies on psychodynamic therapy for panic disorder. Milrod 2007 is one of them. Nevertheless, the guideline downgrades it and explains why: „Due to methodological flaws identified here, the level of evidence was downgraded (e.g., from Ib to IIb for an RCT with moderate flaws; to IV for those with serious flaws).“
The guideline illustrates how this applies in specific cases by referencing a study that was conducted simultaneously at two sites. It abbreviates psychodynamic therapy as PDTh and provides a separate statement for each site. Regarding the CORNELL site, it states that the study „shows no superiority of PDTh over the control group; nor can it be used as evidence of the equal efficacy of CBT and PDTh.“ Regarding the PENN site, it states that the study „shows that PDTh is inferior to CBT and even to the control group.“ The same study, the same methodology, two different results. It is precisely such findings that lower the level of evidence.
The Cochrane Network on Psychotherapies for Panic Disorder provides the clearest explanation. It reviews 54 studies involving 3,021 patients. For the most important outcome—the remission of symptoms after a short period of time—there were 32 studies on CBT compared to only two studies on psychodynamic therapy. The quality of evidence was consistently low across the entire network. Two studies versus thirty-two do not indicate equivalence. However, they also do not indicate inferiority.
The authors also note that psychodynamic therapy showed promising results in the two available studies, that it was the best tolerated of all the psychotherapies examined, as measured by dropout rates, and that, in the long term, CBT and psychodynamic therapy showed the highest remission and response rates. They note that all of these differences are small or imprecise. What is lacking are studies.
There is a counterargument, and it is worth considering. In 2014, Keefe and colleagues reviewed fourteen randomized studies involving 1,073 patients and found psychodynamic therapy to be just as effective as other treatments for anxiety disorders. Nevertheless, the guideline excludes this meta-analysis from its assessment, stating that it did not meet the guideline’s criteria, nor did the majority of the individual studies included in it.
However, since the guideline development group reviewed the literature, two network meta-analyses have been published that examine precisely these two clinical conditions separately. These were not yet available to the guideline development group, and they alter the picture in two ways.
In a 2022 article in the *British Journal of Psychiatry*, Papola and colleagues analyzed 136 randomized trials on panic disorder with and without agoraphobia. Compared to usual care, two approaches performed best: CBT and short-term psychodynamic therapy. Confidence in the findings was unevenly distributed—moderate for CBT and low for psychodynamic therapy—and after excluding studies with a high risk of bias, only CBT remained superior to standard care. Nevertheless, the authors concluded that both are acceptable first-line treatments.
In 2024, Papola and colleagues analyzed 65 randomized trials involving 5,048 participants regarding generalized anxiety disorder in *JAMA Psychiatry*. Psychodynamic therapy was one of the eight approaches examined. In that analysis, CBT, third-wave approaches, and relaxation therapy were found to be superior to standard care; psychodynamic therapy was not among them. Three to twelve months after the end of treatment, only CBT continued to show a benefit. However, the study found no demonstrable difference in efficacy among the various psychotherapy approaches.
All in all, this means that for generalized anxiety disorder, CBT is the most well-supported treatment option—even more so than the 2021 guidelines indicate. For panic disorder, on the other hand, psychodynamic brief therapy is rated more highly in recent studies than in the German guidelines.