diff --git a/doc/source/changelog/1182.added.md b/doc/source/changelog/1182.added.md
new file mode 100644
index 000000000..90787b567
--- /dev/null
+++ b/doc/source/changelog/1182.added.md
@@ -0,0 +1 @@
+Enhance zero pressure boundary conditions
\ No newline at end of file
diff --git a/src/ansys/health/heart/settings/defaults/mechanics.py b/src/ansys/health/heart/settings/defaults/mechanics.py
index 763fb37c7..c3cd80495 100644
--- a/src/ansys/health/heart/settings/defaults/mechanics.py
+++ b/src/ansys/health/heart/settings/defaults/mechanics.py
@@ -153,7 +153,7 @@
         # TODO: align names with cavity/part names.
         # https://doi.org/10.3389/fphys.2018.00539
         "left_ventricle": Quantity(15, "mmHg"),
-        "left_atrial": Quantity(15, "mmHg"),
+        "left_atrial": Quantity(8, "mmHg"),
         "right_ventricle": Quantity(8, "mmHg"),
         "right_atrial": Quantity(8, "mmHg"),
         # # https://doi.org/10.1016/j.jbiomech.2020.109645
diff --git a/src/ansys/health/heart/writer/mechanics_writer.py b/src/ansys/health/heart/writer/mechanics_writer.py
index d5f384d9d..0eacad4f1 100644
--- a/src/ansys/health/heart/writer/mechanics_writer.py
+++ b/src/ansys/health/heart/writer/mechanics_writer.py
@@ -473,8 +473,17 @@ def _get_contraint_caps(self) -> list[CapType]:
             ]
 
             if isinstance(self, ZeroPressureMechanicsDynaWriter):
-                # add additional constraint to avoid rotation
-                constraint_caps.extend([CapType.PULMONARY_VALVE])
+                constraint_caps.extend(
+                    [
+                        # add additional constraint to avoid rotation
+                        CapType.PULMONARY_VALVE,
+                        # add additional constraint to on atrial
+                        CapType.INFERIOR_VENA_CAVA,
+                        CapType.LEFT_INFERIOR_PULMONARY_VEIN,
+                        CapType.LEFT_SUPERIOR_PULMONARY_VEIN,
+                        CapType.LEFT_ATRIUM_APPENDAGE,
+                    ]
+                )
 
         return constraint_caps