Factors influencing pain intensity during topical photodynamic therapy of complete cosmetic units for actinic keratoses.
BACKGROUND
Topical photodynamic therapy is a good treatment option for extensively photodamaged skin with multiple actinic keratoses. Pain is one of the major adverse effects during and after the treatment.


OBJECTIVE
We sought to determine the pain intensity and its influencing factors during the extensive photodynamic treatment of complete cosmetic units.


METHODS
In total, 104 patients with 411 treated fields were enrolled in this retrospective monocentric study. All patients had multiple actinic keratoses on the face, scalp, or back of hands and received an extensive treatment of the complete photodamaged area in our dermatologic outpatient department between February and May 2009. Pain was rated using a visual analog scale directly and 8 hours after photodynamic therapy.


RESULTS
Multifactorial analysis of the data shows that pain intensity is dependent on sex of the patient (P = .030) and location of the treated field (P < .001). Visual analog scale scores were independent of the age and skin type of the patient. No significant difference in pain between the use of 5-amino-4-oxo-pentanoate (methylaminolevulinate) and 5-aminolevulinic acid was noticed. During treatment, mean visual analog scale scores +/- SEM of the different locations were 2.5 +/- 0.36 (hand), 3.6 +/- 0.35 (occiput), 5.2 +/- 0.19 (forehead), 5.9 +/- 0.20 (cheeks), and 7.4 +/- 0.48 (lips). Eight hours after treatment the mean pain +/- SEM in all locations was reduced significantly (P < .001) from 5.2 +/- 0.14 to 3.0 +/- 0.14. The rate of therapy interruptions showed a significant correlation (P = .044) with the location of the treated field. In all, 71% of the patients showed a good and 29% a poor clinical outcome.


CONCLUSIONS
Because of the retrospective study design not all factors that may influence pain (eg, protoporphyrin IX fluorescence) were recorded.


CONCLUSIONS
These results show that pain intensity is dependent on the location of the treated field. Pain intensity is higher in male patients. After 8 hours pain decreases significantly.
Gholam
Patrick
P
Department of Dermatology, University Heidelberg, Heidelberg, Germany. patrick.gholam@med.uni-heidelberg.de
Denk
Katharina
K
Sehr
Tanja
T
Enk
Alexander
A
Hartmann
Martin
M
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000622:Aminolevulinic Acid / Q000009:adverse effects* / Q000031:analogs & derivatives* / Q000493:pharmacokinetics; D003357:Cosmetic Techniques / Q000009:adverse effects; D005260:Female; D006801:Humans; D055623:Keratosis, Actinic / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D009411:Nerve Endings / Q000187:drug effects; D010146:Pain / Q000209:etiology*; D010147:Pain Measurement; D010778:Photochemotherapy / Q000009:adverse effects*; D011524:Protoporphyrins / Q000378:metabolism; D012189:Retrospective Studies; D012727:Sex Characteristics; D016896:Treatment Outcome
D011524:Protoporphyrins; C475457:methyl 5-aminolevulinate; D000622:Aminolevulinic Acid; C028025:protoporphyrin IX